Solidity jobs

...system architecture and core development. Scope of work: - Design and develop backend systems - Build and integrate smart contracts - Contribute to overall system architecture - Ensure scalability, security, and performance Requirements: - Strong experience in backend or fullstack development - Experience with Web3 / blockchain technologies - Experience with smart contract development (e.g. Solidity) - Familiarity with distributed systems - Ability to work independently and take ownership - World wide location developers(except India, Pakistan, Bangladesh, Africa: will skip developers on these locations) Nice to have: - Experience with Ethereum or similar networks - Experience with on-chain/off-chain architecture - Experience in early-stage product development Project details...

...engineering team at LaRevela, the Web3 identity and visitor-intelligence platform for eCommerce, and I need a skilled technical recruiter who is already on the ground in China. Your mission is to identify and secure a mid-level Full-Stack Blockchain Developer who excels at full-stack development and seamless Web3 integration. What the ideal hire must bring: solid, hands-on JavaScript, Python, and Solidity experience, plus a track record of shipping blockchain-enabled products that actually reach users. You’ll handle the entire funnel—sourcing across local and remote talent pools, screening for technical depth, coordinating interviews, and guiding compensation conversations in line with our global structure. Deliverables I expect from you: • A vetted shortlist...

looking for a smart contract developer who really knows their stuff and has at least 3 years of hands-on experience working with blockchain projects. You'll be helping build and deploy smart contracts, making sure everything is secure, efficient, and works smoothly. Ideally, you're comfortable working with Solidity and have experience with tools like Hardhat or Truffle, along with Web3 libraries. It's important that you understand how blockchain systems work and can spot potential security issues before they become problems. I'm looking for someone who's reliable, communicates well, and can take ownership of their work. If you've worked on DeFi, NFTs, or similar projects before, that's a big plus, feel free to share anything you've built. I...

...create a secure, efficient, and scalable contract that allows users to stake tokens and earn rewards over time. Key responsibilities include developing staking mechanisms, implementing reward calculations, and optimizing the contract for low gas usage. You will also handle testing, debugging, and deployment. The ideal candidate should have strong experience in smart contract development (such as Solidity) and a good understanding of DeFi staking models. Knowledge of blockchain security best practices is essential. Bonus skills include experience with Layer 2 solutions, yield optimization strategies, and familiarity with auditing tools. Please share examples of your previous work, including GitHub links or deployed contracts, along with a brief explanation of your approach to ...

My DeFi protocol is code-complete and ready for public launch, but it cannot go live until an exhaustive penetration test confirms it is watertight. The scope is limited to the Solidity smart contracts powering liquidity pools, staking logic, rewards distribution, and governance. I need you to probe for the full range of threats—re-entrancy, flash-loan manipulation, oracle spoofing, unchecked arithmetic, gas griefing, privilege escalation, and any logic flaws unique to DeFi. A balanced mix of automated scanners (e.g., Slither, MythX, Echidna) and deep manual review is expected so no subtle issue slips through. Deliverables • Comprehensive audit report detailing every vulnerability, its severity, reproduction steps, and clear remediation advice • Proof-of-co...

I'm seeking a skilled blockchain developer to assist in the development of a utility governance token project on the Polygon network. Th...development phase and requires expertise in the following areas: Smart Contract Coding: Develop robust and secure smart contracts for the token. Token Distribution Mechanism: Design and implement a fair and efficient token distribution mechanism. Security Audit: Conduct a comprehensive security audit to identify and mitigate potential vulnerabilities. Ideal Skills and Experience: - Proficiency in Solidity and experience with the Polygon network - Strong background in blockchain security and smart contract audits - Experience in designing tokenomics and distribution models Your expertise will be crucial in ensuring a successful and secur...

I'm seeking a skilled blockchain developer to assist in the development of a utility governance...development phase and requires expertise in the following areas: Smart Contract Coding: Develop robust and secure smart contracts for the token. Token Distribution Mechanism: Design and implement a fair and efficient token distribution mechanism. Security Audit: Conduct a comprehensive security audit to identify and mitigate potential vulnerabilities. Ideal Skills and Experience: - Proficiency in Solidity and experience with the Polygon network - Strong background in blockchain security and smart contract audits - Experience in designing tokenomics and distribution models Your expertise will be crucial in ensuring a successful and secure token launch. Ideally based in London f...

I am ready to take a theta-based trading idea from whiteboard to production and need a Web3 full-stack partner to carry the build end-to-end. The core features are already defined: real-time trading data flowing into the interface and automated trading algorithms executing on-chain. Everything will run on the Theta blockchain, so familiarity with Theta SDK, solidity-style smart contracts, and its RPC infrastructure is essential. Authentication will be wallet-based (e.g., WalletConnect or a custom Theta wallet integration) so users can sign transactions directly without traditional log-ins. Here is what I expect to see completed: • Responsive front-end (React/TypeScript preferred) that streams live market data and presents intuitive trade controls. • Smart contracts on...

...Anti-hacking mechanisms * Secure API integration * Regular security audit readiness --- **4. Payment & Banking Integration:** * INR deposit/withdrawal via UPI, IMPS, NEFT * Payment gateway integration (Razorpay / Cashfree or similar) * Bank API integration (if required) --- **5. Tech Stack (Preferred but flexible):** * Backend: Node.js / Python / Go * Frontend: React / * Blockchain: Web3, Solidity (if needed) * Database: PostgreSQL / MongoDB * Cloud: AWS / GCP --- **6. Additional Features :** * Referral system * Trading fees management * Liquidity integration (if needed) * Mobile app (Android/iOS) * API for traders --- **7. Deliverables:** * Fully functional crypto exchange platform * Source code with documentation * Admin panel * Deployment support * Post-launch...

I'm seeking an experienced blockchain developer to create a BEP-20 token on the Binance Smart Chain. Key Requirements: - Develop and deploy a BEP-20 token - Ensure compliance with BSC standards - Provide full documentation and support Ideal Skills: - Proficiency in Solidity and BSC - Experience with tokenomics and smart contract security - Strong background in blockchain development and DApps Please share relevant experience and past projects.

I need a Solidity smart contract deployed on Ethereum that requests a flash loan from Aave, sweeps the borrowed funds through Uniswap and SushiSwap in the same transaction, captures any price-spread profit, then repays the loan with fees before the block closes. The core logic should be gas-efficient, re-entrancy-safe, and written so I can adjust token pairs or add new DEX routers later. Please supply: • A fully commented .sol file showing the Aave flash-loan call, the two-leg swap sequence (Uniswap → SushiSwap or the reverse, chosen dynamically), and the automatic repayment. • A deployment script and a short README explaining environment variables, contract parameters, and how to point to mainnet or a mainnet-fork for testing (Hardhat or Foundry is fine). &bull...

...have, and help craft the smartest possible smart-contract layer. The conversation will revolve primarily around smart contract development—especially the functional design of a robust property-tokenization module. I already have early Solidity prototypes, an outline of how tokenized deeds should flow through the platform, and a clear picture of the user journey; what’s missing is the seasoned perspective that catches edge cases, foresees scaling hurdles, and shapes an elegant contract architecture from day one. You will: • Walk through the current repo (Solidity, Hardhat, Foundry) and validate the overall approach to tokenizing titles and fractional interests. • Draft or refine the contract interface for minting, transferring, and retiring proper...

...certificate (PDF, image, or any common format). 3. The app calculates a SHA-256 hash, sends it to a Solidity contract, and the contract records it immutably on the blockchain (local Ganache during development, then a public testnet or mainnet). 4. To verify, another user re-uploads the certificate; the app re-hashes it and checks the smart contract for a match, instantly confirming authenticity. Technologies I expect you to use include Ethereum + Solidity for the contract layer, React/HTML-CSS-JS for the front-end, and either Node.js or Python for any necessary server-side helpers. MetaMask integration is essential so transactions originate from the browser. Deliverables • Solidity smart contract(s) with clear comments, deployed to a testnet &bull...

...Smart Chain and Tron. Core scope The front-end should let users connect their wallets (MetaMask for BSC, TronLink for Tron), approve token spending, initiate transfers, and instantly view their own balances alongside any relevant contract balances. Everything has to feel seamless, with on-chain calls reflected in the UI in real time. Back-end expectations • Smart contracts written in Solidity for BSC and the Tron-compatible variant, compiled, audited for common vulnerabilities, and deployed to mainnet after a successful testnet round. • Clear functions for approve, transfer, and balanceOf, exposed for the dApp to consume through , , or tronweb as appropriate. Front-end expectations • A lightweight single-page dApp that detects the active network, p...

...and plugs directly into the Coinbase ecosystem. The heart of the project is a group of Solidity contracts—one of them will mint and manage our own ERC-20 token—exposed through a service layer that speaks to the official Coinbase and Base APIs. Automated transactions are a must, so the contracts have to be able to trigger themselves from on-chain or off-chain events without any manual intervention. You will work side-by-side with me from architecture all the way through main-net launch. I am especially interested in developers who can point to previous smart-contract or Coinbase-integrated work; tell me what you have shipped and how it performs in production. Deliverables • Fully-audited Solidity contracts (token + supporting logic) deployed on Base...

...incentive eligibility in Australia). Collaboration: Work closely with the project founder (lawyer, accountant, and business strategist) who will handle commercial, legal, and operational aspects. Provide technical advice for future expansion and optimization. Required Skills: Strong experience with blockchain development (Ethereum, Solana, BSC, or similar). Solid knowledge of smart contracts (Solidity, Rust, or other relevant languages). Proven experience in token creation, blockchain experimentation, and technical problem-solving. Ability to document R&D experiments and technical uncertainties. Experience with testnets, wallets, and crypto deployment tools. Self-driven, proactive, and comfortable working independently with remote teams. Project Scope / Duration: Initial cont...

Looking for an experienced Solidity / BSC developer to build a BEP20 token with a front-loaded daily emission schedule from a treasury wallet. Requirements: * BEP20 token standard * Total supply: 1,000,000,000 tokens * Treasury wallet holds ~70% of supply * Daily emission schedule over 5 years, front-loaded * Release function sends daily emission to treasury wallet * Automatically releases remainder if treasury has fewer tokens than daily amount * Deployable on BSC testnet * Clean, well-commented Solidity code Burn logic and LP mechanics will be handled externally.

Looking for an experienced Solidity / BSC developer to build a BEP20 token with a front-loaded daily emission schedule from a treasury wallet. Requirements: * BEP20 token standard * Total supply: 1,000,000,000 tokens (dummy name: ExampleToken, ticker: EXT) * Treasury wallet holds ~70% of supply * Daily emission schedule over 5 years, front-loaded (higher in early days, tapering over time) * Release function sends daily emission to treasury wallet * Automatically releases remainder if treasury has fewer tokens than daily amount * Deployable on BSC testnet * Clean, well-commented Solidity code Burn logic and LP mechanics will be handled externally.

I’m building a full-scale Agriculture SaaS platform and need a developer who ca...processes it for real-time dashboards, and exposes a predictive model endpoint • Clean API documentation and a short hand-over walkthrough Tech you should be fluent with AWS (Lambda, Fargate/ECS, Dynamo or RDS, CloudWatch) Google Cloud (Cloud Functions or Cloud Run, Pub/Sub, BigQuery) Containerisation with Docker & Kubernetes, CI/CD, and a modern data stack (Spark/Flink, Kafka, or similar). Solidity or other blockchain skills would be a plus. I’ll review code quality, deployment repeatability, and performance benchmarks before signing off each milestone. If you’re confident moving smoothly between AWS and GCP and excited about applying data science to agriculture, I...

...interest in a property, and direct access to the blockchain-stamped document set once a listing is verified. • Administrators: role-based panel to inspect deeds, titles, permits, then press a single “verify” action that triggers smart-contract interaction and permanently records the proof. Technical expectations • Modern stack—React or similar front end, Node/TypeScript or comparable back end, Solidity (or Rust) smart contract, IPFS/S3 for file storage, and a mainstream chain such as Ethereum or Polygon. • Secure authentication, GDPR-compliant data handling, and audit logging baked in from day one. • Clean API so mobile apps can be added later, plus automated tests and CI/CD pipeline. Deliverables 1. Functional web application...

⚡️ CALLING ALL CRYPTO-ANARCHISTS & EVM ARCHITECTS ⚡️ Project: The Sovereign Swap Genesis (Phase 1) Forget the $175—we’re here to build the bedrock of permissionless atomic settlement. We are looking for a high-signal Solidity engineer to architect the Sovereign Atomic Swap on Bitnet Money (Sovereign PoW EVM). This isn’t a standard "copy-paste Uniswap" job. This is a research-grade MVP focused on Ownerless Logic, Atomic Finality, and the future of ZK-integrated trustless swaps. If you dream in Opcodes and believe that onlyOwner is a centralized vulnerability, this is your playground. THE ARCHITECTURAL MISSION The objective is to deploy a purely decentralized, non-custodial HTLC (Hashed Time-Lock Contract) on Chain ID 210. We are stripping away the &...

...decentralized ZK-Atomic Swap platform. The system utilizes Hashed Time-Locked Contracts (HTLC) and Groth16 Zero-Knowledge Proofs (zk-SNARKs) to enable confidential, trustless swaps between native BTN and stablecoins (MockUSDT, MockUSDC, MockUSD1). 2. TECHNICAL STACK & GUARDRAILS (NON-NEGOTIABLE) EVM Equivalence: Maintaining the 100% Solidity compatibility established by the Polygon zkEVM model. Privacy: zk-SNARK (Groth16) via Circom/SnarkJS. (No STARKs). Verifier: Solidity contract using BN254 (alt_bn128) curve + EVM pairing precompile. Gas Target: On-chain verification MUST be < 300,000 gas. Sovereignty: Zero-Admin. 0 matches for owner, onlyOwner, proxies, or upgradeability. Security: Nullifiers required to prevent replay attacks and Proof Malleability checks...

I’m building a di...reward contracts deployed and unit-tested • Coordination layer reliably pairing at least two NLP agents across separate nodes • SDK enabling “plug-in” integration in under 10 lines of code • End-to-end demo settling compute rewards on-chain • Comprehensive README covering node setup, SDK usage, and contract interaction Experience with decentralized protocols (libp2p, IPFS, or similar), Solidity/Rust smart contracts, and NLP deployment pipelines will be invaluable. Future iterations may extend to other machine-learning and computer-vision agents, but this sprint is all about natural-language models. Tell me how you’d architect the solution, the tools you’d pick, and the milestones you propose so we can hi...

...liquidity Automatically distribute winnings Operate without manual wallet intervention Manual Mode When automation is disabled, I must be able to: Manually select betting markets Manually execute arbitrage Manually allocate liquidity Manually trigger transactions Fully control each operational step Automation must be optional and toggleable at any time. Technical Requirements Advanced Solidity expertise DeFi protocol architecture experience Liquidity pool and AMM design knowledge Arbitrage execution logic Secure backend architecture (Railway compatible) Secure wallet generation and storage Coinbase integration compatibility Gas optimization Smart contract security best practices Security, speed, and reliability are critical. Deliverables Fully working smart...

...liquidity Automatically distribute winnings Operate without manual wallet intervention Manual Mode When automation is disabled, I must be able to: Manually select betting markets Manually execute arbitrage Manually allocate liquidity Manually trigger transactions Fully control each operational step Automation must be optional and toggleable at any time. Technical Requirements Advanced Solidity expertise DeFi protocol architecture experience Liquidity pool and AMM design knowledge Arbitrage execution logic Secure backend architecture (Railway compatible) Secure wallet generation and storage Coinbase integration compatibility Gas optimization Smart contract security best practices Security and sustainability are critical. Deliverables Fully working smart cont...

I need a seasoned blockchain developer to create a full-featured NFT marketplace that runs on Ethereum, Binance Smart Chain, and Polygon. The core flow is straightforward: mint, list, buy, or sell NFTs across the supported chains without leaving the platform. What I expect: • Smart contracts for minting and trading on each network, written in Solidity (or the most efficient language for that chain) and fully verified. • A web interface where users can:  – Create an account via email/password,  – Connect their preferred wallet when they’re ready to transact,  – Mint new NFTs with custom metadata,  – Instantly list or purchase items at fixed price. • Clean, well-documented code plus a brief deployment guid...

...run on a *single Ubuntu 22.04 instance* behind Nginx. --- ## Infrastructure You Will Set Up - *AWS RDS* — PostgreSQL 14 database (shared by all services) - *AWS S3* — Private bucket for CSV evidence file storage - *AWS EC2* — Ubuntu server, Nginx reverse proxy, systemd services, SSL via Let's Encrypt - *Polygon Amoy testnet* — Deploy a Solidity smart contract (, already written) using Remix IDE and MetaMask (no Solidity experience required — it is a one-click deploy) - *Hostinger* — Upload two pre-built React apps via FTP --- ## Credentials / Access We Will Provide - AWS Console login (scoped IAM user — EC2, RDS, S3 access only) - AWS S3 access key and secret (for pasting into .env files) - SMTP credentials for OTP em...

...run on a *single Ubuntu 22.04 instance* behind Nginx. --- ## Infrastructure You Will Set Up - *AWS RDS* — PostgreSQL 14 database (shared by all services) - *AWS S3* — Private bucket for CSV evidence file storage - *AWS EC2* — Ubuntu server, Nginx reverse proxy, systemd services, SSL via Let's Encrypt - *Polygon Amoy testnet* — Deploy a Solidity smart contract (, already written) using Remix IDE and MetaMask (no Solidity experience required — it is a one-click deploy) - *Hostinger* — Upload two pre-built React apps via FTP --- ## Credentials / Access We Will Provide - AWS Console login (scoped IAM user — EC2, RDS, S3 access only) - AWS S3 access key and secret (for pasting into .env files) - SMTP credentials for OTP em...

I need an experienced Solidity developer to design, test, and deploy production-ready smart contracts on the Ethereum mainnet. The core requirement is clean, secure contract logic that follows current best practices and is ready for public verification on Etherscan. Your work will cover the full contract lifecycle: architecture discussion with me, coding in Solidity, unit testing with Hardhat or Truffle, gas optimisation, and final deployment through a verified address. Clear, commented code and a brief deployment guide are essential so the contracts can be maintained or upgraded later without confusion. Deliverables: • Audited, optimised Solidity source files • Comprehensive unit tests with passing results • Deployment scripts and step-by-step ins...

...speed and cost efficiency. What I need now is pure development fire-power: someone who can architect and code production-ready smart contracts, design the cross-chain message flow, and stitch everything together on the L2 of choice (Optimistic or ZK rollups are both on the table). The work centres on three pillars—smart contract logic, cross-chain interoperability, and Layer-2 scaling solutions. Solidity (or Vyper), Hardhat/Foundry, EVM-compatible bridges, proof relayers, and gas-optimised patterns will be part of the daily toolbox. Familiarity with rollup frameworks like Optimism, Arbitrum, zkSync or Starknet is a major plus, as is experience with Cosmos SDK / IBC or Polkadot XCM for non-EVM routing. Current architecture diagrams, tokenomics specs, and a partial test sui...

...spin up an autonomous AI-powered trading agent. The agent trades their locked capital for 90 days, credits daily profit on-chain, and makes those profits withdrawable at any moment while the principal remains locked. All portfolio data, trade history and licence status must be visible in real-time through a clean, minimalistic dashboard with licence management at its core. What I need built: • Solidity smart-contracts that mint and manage the five licence types, lock user capital, distribute daily profit, and expose transparent on-chain metrics. • A lightweight Web3 front-end (React, or similar) that follows a minimalistic design language yet feels premium and modern. • A dashboard module focused on licence management but also showing live trading results an...

...with deep expertise in Monero (XMR) privacy coin. Key skills: Monero transaction handling (ring signatures, stealth addresses, RingCT), privacy features, secure transaction processing/obfuscation. Also strong knowledge of cryptocurrency payment gateways (integration, APIs, wallets, processing privacy coins like Monero or similar). Experience: 2-4 years in blockchain/privacy coins development (Solidity, Hyperledger, or Monero-related preferred). Work mode: remote/office work preferred, open to hybrid (occasional visits to Jaipur office if needed – travel expenses reimbursed). Compensation: 90,000 – 150,000 INR per month (or equivalent fixed project rate) + performance incentives for milestones. Strict NDA required before sharing full project specs – privac...

...incentives for meeting or beating milestones. In return, you’ll bring proven skill, reliability, and the agility to deliver in a compressed timeline. Project snapshot • Cybersecurity expert: harden the existing stack, conduct rapid risk assessments, deploy and tune SIEM rules, and leave behind clear remediation documentation. • Blockchain developer: integrate a lightweight chain component (Solidity / Hyperledger welcomed), implement smart-contract logic, and ensure seamless hand-off into staging. • BPO Manager: map current processes, spot inefficiencies, and roll out streamlined SOPs that mesh with the new tech layer. Acceptance criteria 1. Each workstream must reach its functional milestone within the agreed sprint window. 2. All artefacts pass a...

...accents may be strategically used for: Icon details Dividing lines Special corporate materials (business cards, folders, signage) Typography Modern serif or high-end sans serif typeface Uppercase lettering with generous tracking for a luxurious feel “GREEN HOUSE” as the primary visual focus “Real Estate” in a smaller, refined, and discreet style The typography must project: Prestige Financial solidity Trust Exclusivity Brand Impression Green House does not simply develop properties; it represents intelligent investment, conscious architecture, and an exclusive lifestyle. Clean, stylish typography that communicates accessible luxury, professionalism, and distinction Colors: Open to creative freedom. We are open to exploring different color palettes that ...

...smart contracts built on Inco Network (FHE-enabled blockchain) and need a thorough independent review before mainnet deployment. The main priorities are uncovering security vulnerabilities specific to encrypted state handling and verifying correct implementation of confidential computing patterns; gas optimization is secondary. Here is what we need from you: • Manual and automated analysis of Solidity source code using tools such as Slither, Foundry test suites, or similar — adapted for privacy-focused contract logic. • Testing of edge cases related to encrypted variables, access control for confidential data, and proper handling of FHE operations. • Verification that sensitive data remains encrypted throughout contract execution and cannot be leaked thro...

...contracts via ), multi-asset support (ETH, SOL, etc.), user accounts, API endpoints for external dApps Nice-to-Have / Future Phases Support for multiple assets (ETH/USD, SOL/USD, etc.) Historical charts (price + spread over time) using or Recharts Public API for developers to query your aggregated "best" price On-chain price push (become a mini-oracle yourself – requires Solidity dev) Multi-chain bridge monitoring expansion Budget & Timeline Expectations Please provide: Your estimated fixed price or hourly rate Timeline for MVP (dashboard + BTC monitoring) Any questions/clarifications about scope Examples of similar dashboards/tools you've built (especially crypto/DeFi related) Which parts of the stack you are strongest in I'm open to phased de...

...Global reach without app store restrictions This significantly reduces friction compared to web or native apps. Suggested Tech Architecture Frontend Telegram Mini App (WebApp API) React / WalletConnect / Telegram Wallet SDK Backend Node.js / Java Spring Boot REST + WebSocket for live trades Redis for trade state management Blockchain Layer EVM chain (Polygon / BSC / Arbitrum) Solidity-based escrow contracts Upgradeable contract pattern Compliance & KYC Third-party KYC provider Encrypted user identity storage Region-based compliance rules...

I’m ready to launch my own BEP-20 token on Binance Smart Chain and need a developer who can handle the full smart-contract build and deployment. The token must follow the standard BEP-20 specification and include a Minting function so I can expand the supply later when needed. Here’s what I expect from you: • Write a clean, well-commented Solidity contract (OpenZeppelin libraries preferred). • Configure minting so only the owner (my wallet) can call the function. • Deploy the contract to testnet first, then mainnet once I have verified everything. • Verify the source code on BscScan and hand over ownership. • Supply all source files plus a short read-me explaining contract variables, how to mint, and any safety considerations. I alrea...

...Global reach without app store restrictions This significantly reduces friction compared to web or native apps. Suggested Tech Architecture Frontend Telegram Mini App (WebApp API) React / WalletConnect / Telegram Wallet SDK Backend Node.js / Java Spring Boot REST + WebSocket for live trades Redis for trade state management Blockchain Layer EVM chain (Polygon / BSC / Arbitrum) Solidity-based escrow contracts Upgradeable contract pattern Compliance & KYC Third-party KYC provider Encrypted user identity storage Region-based compliance rules...

...token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously with a small technical team Required Skills Strong experience with Solidity and the EVM Ability to architect and deploy production-ready smart contracts High attention to detail and security Ability to write clean, readable, well-documented code Comfor...

I need a brand-new ERC-20 smart contract built from scratch, then deployed to the Ethereum network. The token must include minting, burning, and pausable functionality, implemented with clean, upgrade-friendly Solidity code that follows current best practices (OpenZeppelin libraries, Hardhat or Foundry for testing). Please create, test, and deploy the contract, then hand over everything required for future maintenance. Deliverables • Verified Solidity source code with mint, burn, and pause modules • Full test suite covering core logic and edge cases • Deployment scripts and step-by-step notes (addresses, gas used, etherscan verification) • Final token address on Ethereum mainnet or a clearly documented test deployment if mainnet is postponed Accep...

...token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously with a small technical team Required Skills Strong experience with Solidity and the EVM Ability to architect and deploy production-ready smart contracts High attention to detail and security Ability to write clean, readable, well-documented code Comfor...

I have an almost–finished Web3 application running on BNB Smart Chain and need an experienced engineer to wrap up the last mile. The heavy lifting is on the contract side, but a clean hand-in demands tight coupling with the existing React/TypeScript frontend. What still needs doing • Write production-ready smart contracts for a referral & level system, staking and vesting mechanics, a level-gated NFT mint, and the accompanying ATA utility token. • Deploy, test, and wire those contracts into the current codebase through Wagmi / connectors. • Guarantee seamless Metamask, WalletConnect, and Trust Wallet interaction, including clear transaction states and error handling. • Close out a handful of UI bugs, polish the UX, and verify that every on-chain

I have an almost–finished Web3 application running on BNB Smart Chain and need an experienced engineer to wrap up the last mile. The heavy lifting is on the contract side, but a clean hand-in demands tight coupling with the existing React/TypeScript frontend. What still needs doing • Write production-ready smart contracts for a referral & level system, staking and vesting mechanics, a level-gated NFT mint, and the accompanying ATA utility token. • Deploy, test, and wire those contracts into the current codebase through Wagmi / connectors. • Guarantee seamless Metamask, WalletConnect, and Trust Wallet interaction, including clear transaction states and error handling. • Close out a handful of UI bugs, polish the UX, and verify that every on-chain

...experienced blockchain developer to guide and build the entire solution with me. Because the project is still early-stage, I’m open on the specific chain, tech stack, and even the exact feature set—we’ll define those details together during an initial discovery call. What I do know is that the end product will rely on smart contracts, a dApp front end, and secure wallet interaction, so familiarity with Solidity or similar contract languages, , and modern front-end frameworks is essential. Here’s how I’d like to structure our collaboration: – First, a short technical workshop where you assess my concept, recommend an appropriate blockchain (Ethereum, BSC, Polkadot, or another you feel fits), outline the contract architecture, and flag any c...

... yet go beyond the basics by including three essential capabilities: easy transferability, an on-chain dividend-distribution function that lets me send BNB or BUSD to current holders, and a burn mechanism I alone can trigger when underlying gold is redeemed. Please write clean, well-commented Solidity, test it thoroughly with Hardhat or Truffle, and deploy first to the BSC testnet; after I confirm everything works, walk me through the mainnet deployment. Deliverables 1. Auditable BEP-721 Solidity contract with transferability, dividend payments, and burn controls implemented. 2. Unit tests proving each feature works end-to-end on the testnet. 3. Step-by-step deployment guide plus ownership-transfer instructions. 4. A concise README for future maintenance. The jo...

...basic AML heuristics), and then notifies the merchant’s backend via webhook or GraphQL subscription. Successful transactions should settle directly to the merchant’s wallet; failed or flagged payments must trigger a callback we can act on. I’m comfortable on the product side but need a Solidity/Web3 engineer who can deliver production-ready code, a lightweight Node.js or Python service that talks to the chain, and a small front-end demo so merchants can see it working end-to-end. Deliverables: • Audited Solidity smart contract(s) that handle consumer-to-business payments • Fraud-detection module integrated into the off-chain service • REST or GraphQL API with webhook callbacks for payment status • Minimal front-end demo and cle...

I am building a service that must accept one-time customer payments directly on a public blockchain. My preferred rail is Ethereum, so the core of the job is a production-ready smart-contract–plus–API stack that lets me generate unique payment addresses, confirm the transfer, and surface the confirmation back to my app in real time. Here’s what I need the finished package to do: • Solidity smart contract deployed on Ethereum mainnet (initially Kovan/Goerli for testing) that logs each payment, enforces one-time use, and emits an event my backend can listen to. • Lightweight Web3 interface or RESTful webhook that notifies my server once a transaction reaches a configurable confirmation depth. • Simple front-end snippet (HTML/JS) that shows the cli...