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8.6
8.6
95%

Surat, India
$25 USD per hour
Founders come to me when they need one engineer who owns the entire product: React, Next.js, Node.js, Python, AI integration, mobile app, and deployment. I build AI-powered SaaS products, MVPs, and full-stack web and mobile applications from architecture to production deployment. In 10+ years, I have shipped products used by real businesses: → Built multi-tenant SaaS platforms with schema-based data isolation, role-based access control, Stripe subscription billing, and full admin dashboards deployed and running in production. → Integrated OpenAI, Claude, Azure OpenAI, and LangChain into real products, building AI agents, RAG pipelines, and speech-to-text workflows. → Engineered custom NLP engines with 93.3% entity accuracy, sub‑20ms responses, and scalable processing across 500+ products in a 5‑step state machine. → Developed React Native and Flutter apps with real-time features, third-party payment, and map integrations, delivered simultaneously on iOS and Android. → Engineered real-time architectures using WebSockets, SignalR, and Socket IO for platforms handling 10,000+ concurrent users without performance degradation. → Built and integrated complex third-party systems, DocuSign contract workflows, IMAP email ingestion, government compliance APIs, G2A catalog sync, and multi-system automation pipelines. → Worked across SaaS, healthtech, logistics, e-commerce, sports, fintech, and real estate, adapting quickly to domain requirements without hand-holding. → Maintained Preferred Freelancer badge with Top Rated Freelancer, across 150+ completed projects with long-term client relationships and on-time delivery. My stack covers the full product: → AI & LLM Integrations • OpenAI, Claude, Gemini API Integration • LangChain, Pinecone, Weaviate, FAISS • Custom AI Agents, Intelligent Workflows, RAG Architecture → Frontend Development • React, Next.js (App & Pages Router), Vue.js, Angular • Tailwind CSS, Material UI, Chakra UI, Framer Motion • Redux, Context API, React Query → Backend Development • Node.js, Express.js, Nest.js • Python, Django, FastAPI, Flask • Supabase, Firebase, REST APIs, GraphQL • WebSockets, Socket IO, JWT/OAuth Authentication → Mobile Development • React Native (Expo & CLI), Flutter • Real-time chat & video (Twilio, Agora, WebRTC) • Third-party integrations (Stripe, Maps, Push Notifications) → Database & Cloud • PostgreSQL, MySQL, MongoDB, Redis • AWS (S3, EC2, Amplify), Google Cloud I work best with founders and technical leads who need one reliable engineer to own the build end-to-end. I communicate clearly, flag blockers early, and treat your deadline as mine. Send me a message with your requirements, and we can outline your technical roadmap on a quick call. Bhavin Sen

10.0
10.0
98%

Ahmedabad, India
$20 USD per hour
✨ Welcome to Our Profile!✨ AIS Technolabs is a leading developer of: ❖ Mobile Applications (Native & Hybrid) ❖ Multi-player Games (Unity 3D, Unreal Engine 5) ❖ Responsive Websites (Open Source, HTML, CSS, JavaScript) ❖ Advanced Solutions in IoT, VR, and AR ✅ Since 2010, we've successfully completed 3200+ projects and built an impressive portfolio that continues to grow. Specialties ✨ We excel in a diverse range of technical expertise—from a simple HTML page to robust Enterprise Solutions. ✅ Website Development: - Front-End: HTML, CSS, JavaScript, Angular.js, React.js, jQuery, SASS - Back-End: PHP, C++, Java, Python, Node.js, Express.js, Django, Ruby on Rails, Laravel, Spring ✅ Mobile App Development: - iOS/Android Apps (Java, Swift) - Cross-Platform Apps (React Native, Ionic App) ✅ Game Development: - Unity3D, Unreal Engine 5 ✅ IoT, Virtual Reality (VR), and Augmented Reality (AR): - Cutting-edge solutions tailored for innovative and immersive experiences ✅ Blockchain & Cryptocurrency Solutions: - Custom Cryptocurrency Development - Cryptocurrency Wallets - Exchange Applications ✅ Worked With Blockchain Leaders: - Tron, Binance Chain, and Ether Chains Successful Projects Completed ★ Games: - RPG, FPS, Casino, Slot Machine, Crash Game, Jackpot, Roulette, Poker, Coinflip, NFT, Sports Betting, Ludo, Card Game, Action, Adventure, Arcade, Shooting, Bingo, Dice, Lottery, Cricket, Racing, Soccer ★ Apps: - Flight Booking, Hotel Booking, Social Media, Dating, Taxi, Live Streaming, IPTV, Money Transfer, Food Delivery, Courier, Chat, Auction, Trading, Booking, Fintech, Finance, Productivity, etc. ★ Software: - ERP, CRM, Project Management, HR Management, Fleet Management, Employee Management, Vendor Management, Inventory Management, Task Management, Staff Management ★ Websites: - Dating, Social Media, Real Estate, eCommerce, Construction, Bakery, Informative, Blog, Business, Corporate ✱ Why Choose Us? We aim to build long-term relationships with our clients. Your satisfaction is our mission! We are just a click away to assist you!

6.7
6.7
99%

Howrah, India
$75 USD per hour
We are Codesigma Technology Services, a full-stack development agency based in India with 10+ years of delivering complex, production-ready applications. Our founder and top developers have experience working with Inc. 5000 companies and professional teams across the world, bringing a strong understanding of diverse, multicultural work environments to every project. We are a tight team of experienced developers - small enough to move fast, experienced enough to build right. You always work with the most senior person, not a project manager who delegates to juniors. What we've built: -> Cross-platform POS system - React, Firebase, Flutter, Electron - running on Web, Android, iOS, macOS, and Windows with full offline-first functionality and real-time sync -> Multi-channel e-commerce aggregator - unified management of Amazon, Flipkart, Shopify, Meesho, Nykaa orders, inventory, warehouse, and payment reconciliation -> Real-time audio/video interpretation SaaS - Twilio Voice/Video, Task Router, BoostLingo integration, serving a global user base -> Booking systems, media streaming platforms, headless CMS websites, Shopify applications, and WordPress plugins across industries Our technical stack: Frontend: React, Next.js, Angular, JavaScript, TypeScript Backend: Node.js, PHP (Laravel, CodeIgniter), Python Mobile & desktop: Flutter, React Native, Electron.js Real-time: Twilio, Firebase, WebSockets Data: MySQL, MongoDB, PostgreSQL, Firestore Integrations: Stripe, PayPal, Razorpay, Shopify API, Amazon SP-API, GraphQL Infrastructure: AWS, Linux server management, deployment We are the right fit if you need: - A long-term development partner, not a one-off freelancer - End-to-end ownership from architecture to deployment - Cross-platform delivery (web + mobile + desktop from one team) - Complex integrations with third-party APIs and platforms - Clean, documented, maintainable code that your team can take over We work on fixed-price and hourly engagements. For ongoing projects, we offer monthly retainer arrangements. Let's discuss your project.

8.1
8.1
97%

Surat, India
$25 USD per hour
✨ Welcome to Empiric Infotech: AI-Powered Mobile, Web & Full-Stack Development ✨ Most AI and software projects don’t fail because of ideas, they fail because of slow execution, weak architecture, and systems that don’t scale. With 12+ years of experience, a 5.0 rating across 67 client reviews, and a consistent record of 100% on-time and 100% on-budget delivery, Empiric Infotech helps startups and enterprises turn ideas into reliable, scalable, production-grade AI and software products. We are a full-service AI, SaaS, and product engineering agency trusted across the US, UK, and Europe. As an Official FlutterFlow Expert Agency Partner, we also accelerate MVP and mobile product delivery, helping founders launch faster, validate sooner, and scale confidently. Our core competencies include: ✅ AI Development & Machine Learning: LLM-powered applications, AI agents, RAG pipelines, AI chatbots, and intelligent systems using OpenAI, Claude, Gemini, GPT-4, LangChain & LangGraph, enabling automation, decision intelligence, and conversational AI solutions. ✅ MVP & SaaS Development: Rapid MVP development and scalable SaaS platforms with multi-tenant architecture, subscription systems, and production-ready deployment using modern engineering practices. ✅ Full-Stack Web Development: High-performance web applications built with React, Next.js, Node.js, FastAPI, and scalable backend architectures integrated with PostgreSQL, Firebase, and AWS. ✅ Mobile App Development: Native-quality iOS and Android applications using Flutter & FlutterFlow, optimized for performance, UX, and rapid go-to-market product launches. ✅ API Integration & System Engineering: Seamless third-party and custom API integrations including Stripe payments, CRM systems, ERP platforms, WebRTC, and enterprise-grade services, ensuring smooth system interoperability. ✅ AI Workflow Automation: Intelligent business automation pipelines using n8n, Make, and Python, streamlining operations across marketing, sales, support, and internal workflows. ✅ Cloud & DevOps Infrastructure: Scalable deployments and cloud-native systems using AWS, Firebase, Docker, and CI/CD pipelines, ensuring reliability, security, and performance at scale. ✨Specialties: From a simple landing page to a complex AI-powered enterprise SaaS, we deliver scalable, production-grade systems with clean code and seamless handoff. 🏆Recent Work: • AI health diagnostics platform (HIPAA-compliant, multi-tenant) • Multi-channel AI conversation web app • PDF automation saving legal teams 20+ hrs/week • B2B e-commerce platform with AI-assisted procurement 📩 Have an AI, SaaS, or app idea? Share it with us and we’ll respond with a clear technical plan, realistic scope, and transparent pricing.

7.7
7.7
94%

INDORE, India
$20 USD per hour
Five Exceptions Software Solutions Pvt. Ltd. is an ISO certified established in 2015. Our team comprises of immensely talented and dynamic project managers, software developers and testers that work with a focus on quality and timely delivery. 5Exceptions empowering businesses by enabling digital transformation and uncomplicating business processes. Our Technology Stacks 1) Web Development (Frontend and Backend): HTML5, CSS3, Javascript, jQuery, AJAX, Angular.js, React.js, Node.js, PHP, Codeigniter, Laravel Framework, Java, Python, Wordpress, Drupal, Joomla, Ecommerce Development, Woocommerce, Shopify, MySQL, MongoDB, Web Services, & Spring. 2) Mobile App: Android, iPhone, iPad, iOS Development, Ionic Framework, Hybrid, React Native & Flutter. 3) Cloud Services: AWS, Google Cloud & Azure 4) IoT, Augmented Reality & Lidar technology ============================ Our Process: Our software development process has been defined & fine-tuned since beginning. We at 5Exceptions are skilled at implementing any kind of workflow requested by the client. We could split traditional frameworks & use the hybrid approach, taking the best suitable elements from Scrum, Kanban & Waterfall. Collaboration Approach: Our collaboration approach aims at providing value to our clients with fully integrated & dedicated software teams and development processes. To achieve this goal, we follow a five-step process which ensures a proper start & step by step consolidation of any new partnership. 1. Collaboration Scope: The initial focus of the relationship is on exploring project requirement and challenges, and matching these needs with our capabilities & resources. Some of the artifacts & activities for this stage are as follow. -Confidentiality Agreement & learning each other's business -RFI/RFP completion 2. Proposal: The parties prepare and agree on a framework contract, which defines the general terms of the partnership such as the delivery model, ownership, work parameters, payment terms, rights and responsibilities of the parties and other aspects commonly agreed upon. 3. Ramp Up: At this stage, we pay special attention to the establishment of the remote process & finding the best communication channels because well-organized interaction is the base for any outsourcing company. We are ready to use the following channels. -E-mails -Instant messaging -Project Management Systems -Versioning & Reporting Systems 4. Implementation: We implement the projects in successive iterations, with clear outcomes defined for each iteration. 5. Continuous Feedback: Our goal is to contribute to the success of our client's businesses and to build long term relationships with them. To accomplish this objective we get continuous feedback, which we use to shorten the development cycle and increase the quality of the deliverables, improve team dedication and pave the way for lasting collaborations. Let's discuss your requirement and see how we can be of help you to :)

3.7
3.7
100%

Shrimadhopur, India
$10 USD per hour
Having more than 8 years plus experience in IT/Software Development & SEO/SMO. I am individual with a team of designers and developers who are Expert in Web Designing & Development, Graphics Design, Animation & Multimedia, Android App, & SEO/SMO to meet your every requirement. We are experts working from past 7 years and now willing to grow in freelancer industry. We are willing to work with you please consider us and give revert on our bid. Feel free to get in touch with me if you need: Graphics Design (Flyer, Banner, Web Layout, Logo, ID Card, Visiting Card) Animation Design Approval Website Design Website Development Mobile Apps Development E-Commerce Website Software Solution Full SEO package SMO (Social Media Marketing)

2.3
2.3
88%

Tiruchirapalli, India
$10 USD per hour
An enthusiastic and experienced person who developed and hosting website on E-commerce / business/ personal and in all formats. I'm a skilled Angular, React.js, Node.js developer (using v14) with 4.5+ years of web developing experience especially front-end. Also expert in WordPress environment. I've worked for trademarked company websites like besmak, handyforall, chockz , baseball etc... Skills I possess : _________________ HTML5, CSS3, Angular7+, Wordpress, React.js, Node.js, java, spring boot, Laravel, php Below are the few sample websites I've completed as a freelancer. https://handyforall.zoproduct.com/ www.imaginetventures.com www.bhalajephotography.com Also have a look at Portfolio for more details.

0.0
0.0
50%

Hisar, India
$10 USD per hour
Hello I am Ishwar a FULL-STACK developer with over 5 years of experience in website and mobile app development. I have valuable and practical experience in Mobile Native & Hybrid Developing. My goal is building good and long term relationship by offering what you need. ➡️FRONTEND ➔ Angular, React, Vue.js, HTML, CSS, Bootstrap ➡️BACKEND ➔ NodeJS ➡️DB ➔ MySQL, MongoDB ➡️Mobility ➔ iOS & Android( React Native & Ionic) » My services: - -Open for long time relationships -Communication every day -Providing support 24/7 -Quick Response Time Please send me a message me and let’s discuss further detail for your project. I am always ready for you. Thank you
An RxJS specialist is a JavaScript developer who builds reactive applications using RxJS, the Reactive Extensions library for composing asynchronous and event-based programs with observable streams. These freelancers design, debug, and optimize observable-driven code in Angular, React, Node.js, and other JavaScript environments where data flows, user events, and API calls must be coordinated cleanly. Hiring an RxJS specialist gives your team deep expertise in operators, schedulers, subjects, and reactive patterns that prevent memory leaks and race conditions in production code.
RxJS development is a niche but high-impact skill. A capable RxJS consultant turns tangled callback chains, nested promises, and brittle state logic into predictable, declarative streams. The commercial value is measurable: fewer bugs in async flows, faster feature delivery in Angular projects, and lower memory consumption in long-running single-page applications.
Typical deliverables from an RxJS expert include:
Reactive programming has a steep learning curve, and operator fluency separates a true RxJS consultant from a generalist who has used a few observables. A strong candidate will demonstrate command of the following areas:
RxJS rarely lives in isolation. Freelancers in this space typically work across a stack that includes:
RxJS specialists are in demand wherever applications handle concurrent data sources or real-time user interaction. Common engagements include financial trading dashboards with live price feeds, healthcare platforms streaming patient telemetry, logistics tools with map-based vehicle tracking, e-commerce search experiences with reactive filtering, SaaS products with collaborative editing, and IoT consoles aggregating device events. Enterprise Angular migrations and modernization projects are another frequent source of work, especially when legacy code mixes promises, callbacks, and observables inconsistently.
Look for portfolio evidence of production Angular or reactive React applications, contributions to open-source RxJS projects, technical blog posts explaining operators, or public repositories with marble tests. Strong candidates can articulate why they chose switchMap over mergeMap in a specific scenario, not just that they used it. Tool proficiency should extend to TypeScript generics, debugging with RxJS DevTools, and profiling subscription leaks.
Sample interview questions you can use directly:
Freelancer.com gives you direct access to a global pool of reactive programming experts, from Angular architects to full-stack engineers fluent in observable patterns. You can compare profiles, portfolios, ratings, and verified reviews before you commit, and you set your own budget so freelancers on Freelancer.com bid competitively for your project. Whether you need a short consultation to debug a subscription leak or a multi-month engagement to lead a reactive refactor, the marketplace scale on Freelancer.com makes it straightforward to match scope to specialist.
Hiring an RxJS expert is straightforward when your brief reflects the reactive nature of the work. Because the skill is technical and narrow, the more concrete you are about your framework, observable patterns, and pain points, the better the bids you will receive. The three steps below walk through the process from brief to award.
Your project brief is the single biggest determinant of bid quality. A clear, technical brief filters for freelancers who genuinely understand observables and can match your stack from the first message. Head to the
Bids on a technical brief like this are mini-proposals, not just price quotes. A strong RxJS specialist will reference your stack, ask sharp clarifying questions, and propose an approach grounded in specific operators or patterns. Read each proposal carefully and shortlist candidates who demonstrate that they have actually understood the reactive problem you described.
The final decision combines proposal quality with profile evidence. For RxJS work, look at consistency across past reactive projects rather than a single standout example, and pay attention to written reviews that mention code quality, communication, and async debugging. Verified credentials and on-time delivery rates matter more on technical engagements than headline ratings alone.
Every Angular developer touches RxJS, but an RxJS specialist has deeper command of operators, schedulers, multicasting, and marble testing. If your problem is fundamentally about async data flow, race conditions, or stream composition, hire a specialist rather than a generalist Angular engineer.
Yes. Many engagements are short and surgical, such as fixing a memory leak, refactoring a problematic component, or pair-programming on a tricky observable pipeline. You can post a fixed-scope brief on Freelancer.com and receive bids within hours.
Signals and RxJS are complementary, not competing. Signals handle synchronous reactive state inside components, while RxJS remains the standard for async streams, HTTP, WebSockets, and complex event coordination. A strong RxJS consultant can advise on where to use each and how to interop cleanly with toSignal and toObservable.
Scope drives timeline. A targeted bug fix or operator review can be completed in a few days, while a full reactive refactor of a large Angular codebase may span several weeks. A clear brief with code samples helps freelancers estimate accurately.
For most reactive programming work, an individual specialist delivers faster and at lower coordination cost than an agency. Agencies make sense only when the engagement bundles RxJS work with broader architecture, DevOps, or design needs that one freelancer cannot cover alone.

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