Freelance React/Solidity Developer for Auction Loan MVP with Invite-Only System
$25-50 USD / hour
Closed
Posted 14 days ago
$25-50 USD / hour
Overview
We need a developer to build a Phase 1 Minimum Viable Product (MVP) for an auction website where buyers provide loans to sellers, tracked via smart contracts on the Polygon blockchain. The platform features $10,000+ loans with seller-proposed terms (amount, rate, term) and collateral (crypto at 150% value, e.g., $15,000 USDC, or real property via attorney-drafted liens), buyer counteroffers, and an invite-only membership system. Attorneys handle lien creation and payoffs off-chain. The goal is a functional, cost-effective MVP for 10-50 initial users.
Scope of Work
User Interface (UI):
Seller Dashboard: Listing form (loan terms, collateral), counters tab, loans tab, invite code generation.
Buyer Dashboard: Auction browser (filterable listings), counter form modal, bids/loans tabs.
Attorney Portal: Lien verification queue, payoff tracking, earnings summary.
Admin Dashboard: User management, loan oversight, attorney coordination, financials, invite code issuance.
Use React + Bootstrap for responsive, simple design.
Smart Contracts:
Deploy on Polygon (testnet initially).
Features:
Crypto collateral staking (e.g., $15,000 USDC for $10,000 loan, 150% ratio).
Loan funding on buyer acceptance or counter approval.
Repayment logic (monthly unlock of collateral).
Default handling (collateral to buyer after 30-day miss).
Attorney approval flag for real property liens (off-chain signal triggers contract).
Include 1% origination fee ($100/loan, split $75 platform/$25 attorney).
Invite-Only Membership System:
Database-Driven Approach:
Store invite codes in SQLite (table: code, inviter_id, used_by_id, status).
Admin generates initial codes (e.g., 20) via dashboard.
Users generate 2-3 codes each from their dashboard (hardcoded limit).
Registration form validates codes against SQLite; marks as used on success.
UI: “Generate Invite Code” button (seller/buyer dashboard), “Enter Invite Code” field (registration).
Backend: Node.js endpoints (/generate-invite, /validate-invite) with SQLite queries.
Backend:
Node.js + SQLite for off-chain data (invites, lien PDFs, user status).
Integrate [login to view URL] for Polygon interactions (staking, funding, repayments).
Manual attorney lien approval (e.g., email flag updates contract).
Features:
Seller proposes terms/collateral; buyers accept or counter once (48-hour seller response).
Collateral: Crypto (USDC) staked on-chain; real property liens uploaded as PDFs, verified by attorneys.
Notifications: Basic email alerts (auctions, counters, repayments) via SendGrid free tier.
Tech Stack
Front-End: React, Bootstrap (responsive UI).
Back-End: Node.js, SQLite (lightweight DB).
Blockchain: Polygon (Solidity, [login to view URL] for contract calls).
Hosting: Vercel or Netlify (free tier for front-end), $5/month VPS for Node.js/SQLite.
Deliverables
Deployed MVP on Vercel/Netlify with Polygon testnet contracts.
Source code on GitHub (React app, Node.js backend, Solidity contracts).
README with setup instructions (e.g., npm install, testnet deployment).
Basic testing (5-10 dummy users, 2-3 loans funded).
As a seasoned freelance developer with extensive experience in React and Solidity, I understand the importance of building a Phase 1 Minimum Viable Product (MVP) for your auction loan platform on the Polygon blockchain. Your project's goal of creating a functional and cost-effective MVP for initial users aligns perfectly with my expertise in developing innovative blockchain solutions.
I have successfully delivered blockchain projects in the past, specializing in smart contracts and Web3 technologies. My experience with Ethereum and Polygon, coupled with my proficiency in React and Node.js, makes me well-equipped to handle the development of your auction loan platform. With a keen eye for detail and a focus on user experience, I am confident in delivering a seamless and efficient solution that meets your requirements.
If you're looking for a dedicated developer who can bring your vision to life, I am here to help. Feel free to reach out to me to discuss your project needs further and take the first step towards creating a successful MVP for your auction loan platform on the Polygon blockchain.
Hello,
I understand you're looking for a skilled developer to create a Phase 1 MVP for your auction loan platform where buyers provide loans to sellers using smart contracts on the Polygon blockchain. My approach involves developing a responsive UI with React and Bootstrap, ensuring that sellers and buyers have easy access to their dashboards. I will implement secure smart contracts for managing loan terms and collateral, with robust features for your invite-only membership system managed through a Node.js backend and SQLite database. My goal is to deliver a fully functional MVP that can efficiently serve 10-50 initial users while meeting your specified requirements.
What specific timeline do you have in mind for the MVP development, and are there any particular milestones you want to achieve during this process?
Thanks,
Shamshad
Hello,
Building an MVP auction platform for loan-based smart contracts on Polygon is an exciting project. I can develop a streamlined React frontend, Node.js backend, and Solidity contracts to ensure secure, transparent transactions with invite-only access and collateralized lending.
A few quick questions:
Would you like an escrow system for off-chain collateral verification before loan funding?
Should users have a real-time dashboard for tracking bids and repayments?
Do you have preferred testnet settings (Mumbai, faucet integrations) for initial deployment?
Looking forward to bringing your vision to life. Thanks for your time! I guarantee clear communication and high-quality work tailored to your needs, ensuring your complete satisfaction.
You can check my reviews here as well: https://www.freelancer.com/u/kamran2012
Looking forward to potentially working together on this project.
Hey, Thanks for your post. I'v read your description carefully.
I have relevant experience I can help. some of my skills are: Smart Contracts, Ethereum, Blockchain, Metamask and React.js
Hope you're having a nice day my friend :)
Hey ,
Good afternoon!
I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams.
I’m offering best quality and highest performance at lowest price.
I can complete your project on time and your will experience great satisfaction with me.
I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery.
I have rich experienced in Bootstrap, JavaScript, React.js, Node.js and Web3.js.
For more information about me, please refer to my portfolios.
I’m ready to discuss your project and start immediately.
Looking forward to hearing you back and discussing all details..
Hope to hear from you soon
Hi there
SynapseIndia specializes in blockchain-powered auction platforms. We'll develop a scalable, Polygon-based MVP with smart contracts, collateral staking, and invite-only access. Our expertise ensures secure, efficient lending transactions for early adopters.
We are SynapseIndia, and you can trust us for our 23+ years of success in the industry, with over 18,000 projects and 5 million+ hours delivered. Our top clients include IBM, Johnson & Johnson, PayPal, Audi, and Nestlé. We adhere to ISO-certified CMMI Level 3 standards throughout the SDLC.
Why choose SynapseIndia -->
+ Successful journey of 23+ years In Industry
+ 100% Job success and Top Rated Plus agency on Upwork
+ Our top clients include IBM, Johnson & Johnson, Paypal, Audi, Nestle, and others.
+ Microsoft Gold Certified Partner
+ ISO certified CMMI Level 3 Standard followed throughout the entire SDLC
Note: The bidding price and timeline are provisional. The final cost will be determined after a detailed discussion.
Sincerely,
SynapseIndia
I.T. Outsourcing @ Peace of mind
An ISO 9001|27001|27701 Company
"Outsourcing @ Peace of mind"
Hello, ! Thanks for posting the job "Freelance React/Solidity Developer for Auction Loan MVP with Invite-Only System". I have the necessary skills, knowledge and expertise to help you complete your project and have successfully done very similar project 3 weeks ago.
I'm available to start immediately and can deliver you of high-quality work delivered with fast speed and efficiency.
Let's have a brief call or chat soon to discuss further details. Looking forward to working with you!
Best regards,
William
Hi There,
I’m excited to offer you a 20% discount on React and Solidity development for your Auction Loan MVP with an invite-only system. With expertise in blockchain development and modern web technologies, I specialize in building secure and scalable decentralized applications. I will develop a seamless auction loan platform, integrating Solidity smart contracts with a React-based frontend and implementing an invite-only system for controlled access. This process will include contract development, frontend implementation, secure authentication, and thorough testing.
Let’s connect to discuss your project, and I’ll deliver a robust and fully functional MVP.
Best regards
SDH Official
Hi there
Hope you are doing well.
I am a professional engineer having 17+ years experienced in web and Block Chain development.
I have developed Solidity using Tron Smart Contract, Polygon Smart Contract, and BSC Smart Contract.
I specializes in MLM (Binary, Force Matrix, Unilevel, Matrix, Cycler Matrix, Straight Line, Board Matrix)with expertise deploying to both server and server less environments.
My main full stack expertise’s are Python, Django, ReactJs, AngularJs, NodeJs, Spring Boot, Solidity Programming (BEP- 20, ERC- 20 and ERC- 721), Binance Smart Chain, NFT,PHP, Cake PHP, CodeIgniter, Open-cart, Laravel, WordPress, WooCommerce etc.
We used MySQL, MongoDB, PostgreSQL and SQL Server for development.
We'd love to work with you and can assure you of the delivery of your website within time and without any compromise in the quality and professionalism. Kindly reach out through chat for further discussion.
So looking forward positively to work on this project.
Thanks & Regards
Kabirul
Hello realtgk01,
I am Maryam Abbas, a seasoned developer with 4 years of expertise in JavaScript, Node.js, and React.js. I have carefully reviewed the requirements for the auction loan MVP project and am confident in my ability to deliver a successful solution.
For this project, I propose to create a user-friendly interface using React and Bootstrap, deploy smart contracts on the Polygon blockchain, and implement features such as crypto collateral staking, loan funding, repayment logic, and an invite-only membership system. My experience and track record of successful projects make me a reliable choice for this endeavor.
You can review my portfolio at
https://www.freelancer.pk/u/maryam951
and I am eager to discuss the project further. Looking forward to collaborating with you.
Best regards,
Maryam Abbas
Hey, I'm Ahmed from California, a Senior Full-Stack Engineer with over 15 years of experience in web and mobile application development. Going through your job posting, I felt that I am enough qualified for this project - Freelance React/Solidity Developer for Auction Loan MVP with Invite-Only System.
I have worked on similar projects many times in various companies as a senior full-stack engineer, senior developer, and project manager. So I can deliver the quality result in your deadline.
Let's bring your vision into life with me.
Best regards,
Ahmed Hassan (Eddie Hassan)
Hi,
I’d love to help build your auction platform MVP on Polygon. I have experience with React, Node.js, Solidity, and smart contract development. I can deliver the front-end, smart contracts, and invite-only membership system, just as you described.
We’ll use React + Bootstrap for a simple UI, Node.js + SQLite for the backend, and deploy on the Polygon testnet.
I’ll make sure everything runs smoothly, and you’ll get the MVP with source code and setup instructions.
With my extensive experience in HTML, CSS, React, JavaScript, and Node.js - I am confident that I can deliver a high-quality MVP in line with your requirements. Specifically, I have a flair for creating responsive, dynamic and easy-to-use UI that perfectly aligns with the intended design flair of this project. Arguably, my organizing and multi-tasking abilities developed throughout 6 years of freelance experience help me to manage complex back-end systems with ease.
In relations to the smart contract functionality of the website, my expertise in Solidity would ensure smooth deployment on the Polygon blockchain. With Polygon being a new network and still evolving software, it's crucial to have experienced hands navigate its peculiarities. My fluency with Polygon's working environment will minimize time-consuming and costly errors in the testnet deployment phase.
Finally, as an avid blockchain enthusiast, I'm excited by any opportunity to explore new concepts and push myself. Working on this auction loan MVP will give me that chance; trust me when I say delivering impressive and valuable results is one thing that brings me utmost satisfaction. Looking forward to using my technical skills for you, let's make this project a success!
"I think I am the perfect fit for your project. Your need for a user-friendly auction website with Polygon blockchain integration aligns with my expertise in React, Node.js, and Web3.js. Although new to Freelancer.com, I have extensive experience in delivering seamless and integrated platforms. I'd love to chat more about your project! Regards, Juandre."
Hi, I am Ronan.
I read your project details and I am excited to express my interest in your project.
With several years of experience in full-stack development, I am confident in my ability to bring substantial value to your project. And also I have various experiences in JavaScript, Node.js, Bootstrap, React.js, Web3.js. I am a passionate developer and always strive to implement best practices on all my projects.
Please come over chat and discuss your requirement in a detailed way.
Regards
I would be happy to help you build the MVP for your auction website, implementing smart contracts on the Polygon blockchain. With my expertise in React, Node.js, SQLite, and blockchain integration, I’ll create a secure and functional platform for loan management, invite-only memberships, and crypto collateral handling.
Hi,
Man, I'm seriously pumped about building this Auction Loan thing for you. It's like, React, blockchain, and an invite system? That's right up my alley! I get you wanna get this thing going without breaking the bank, and I'm totally confident I can whip up a solid first version that'll get your users hooked. I've gone through all the details, and I totally see where you're going with this.
First thing's first, we gotta make this thing look good and work smooth. I'm thinking clean dashboards for everyone sellers, buyers, lawyers, the whole crew using React and Bootstrap. We want it to work awesome on phones, too, you know? At the same time, I'll be building the smart contracts on Polygon, making sure the loans, the collateral, and the payments all work like clockwork. Security and speed are gonna be top priorities there.
For all the behind-the-scenes stuff, I'll use Node.js and SQLite to handle things like the invite codes and user stuff. And I'll make sure it all talks to the blockchain perfectly using Web3.js. That invite system? We'll get that locked down tight with SQLite, making sure only the right people get in. Plus, we'll get those email notifications working with SendGrid, so everyone knows what's up.
How will you manage concurrent access to the SQLite database to prevent race conditions during invite code operations?
Syed Mohsin Rizvi ✓ ᵛᵉʳᶦᶠᶦᵉᵈ
As an experienced MERN stack developer with proven expertise in the relevant technologies for this project, I am confident that I have the skillset and proficiency to deliver an auction website of the highest standard. Throughout my career, I have focused on building responsive applications with a keen emphasis on performance and user experience - traits that directly align with the goals of your MVP. Not only am I deeply knowledgeable in React.js and Bootstrap for UI design as well as Node.js and SQLite for backend logistics, but I am also adept at integrating API for smooth data flow.
Lastly, my experience isn't limited to development. As a freelancer, I understand the value of effective communication and timely delivery. You can rely on me to deliver clean and efficient code solutions that precisely meet your needs while collaborating effectively across different stages of development. With me on board, you can expect not just a functional MVP but also a quality product that performs consistently whether handling 5 users or scaling up to support 50 or more. Partner with me now, and let's bring your vision to life together!
✨ Hello! ✨
As a senior software engineer with over 12 years of experience, I am confident in this project. I have done many similar projects before and would like to discuss further details as I am the perfect fit for this project.
1️⃣ Github, Gitlab, Trello, Jira
2️⃣ Wordpress, Django, Flask, Laravel, Node.js, Odoo, Joomla, Zoho, JSP, Spring Boot
3️⃣ React, Angular, Vue, TilawindCSS, Bootstrap, React Native, Flutter, Kotlin, Swift
4️⃣ NLP, ML, Computer Vision, Deep Learning
I would like to discuss further details via chat and looking forward to hearing from you soon.
Kind Regards.
Valerii.
