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Full Stack Developer (React + Node.js) - frontend-focused, production-grade, team-backed.
I'm a full stack developer who builds, maintains, and improves modern, responsive web applications - working products with real users, not prototypes that fall over on first real traffic. React and Next.js on the front end, Node.js on the back end, full ownership from concept to deployment.
6+ years building for the web. 30+ React and full stack applications shipped - SaaS platforms, dashboards, and MVPs taken from concept to production. Recent builds: 40-60% faster page loads, MVPs live in 4-8 weeks, and dashboards a 20-person team opens every morning to run their day.
📈 WHAT YOU GET
One full stack developer as your single point of contact, with a small team of backend, QA, and design specialists behind me. You cover frontend developer, react developer, backend, and database work without juggling three separate hires - and you keep full ownership of the codebase, start to finish.
⬩ Clean, scalable, maintainable React code with clear component architecture
⬩ Responsive front-end interfaces wired to REST APIs and real backend services
⬩ Honest timelines, written async updates, and delivery without micromanagement
🚀 FRONTEND (REACT / NEXT.JS)
As a react developer and front end developer, I build modern, user-friendly interfaces with React.js, Next.js, JavaScript, TypeScript, and Tailwind CSS. Pixel-accurate Figma-to-code, data-heavy dashboards, admin consoles and SaaS portals, advanced tables and filtering, real-time data views, and the performance work that keeps Core Web Vitals and load times healthy. Strong on responsive design, cross-browser behavior, and clean state management. If your brief says react.js developer, that's me too.
⚙️ FULL STACK & BACKEND
On the backend developer side I work with Node.js (Express, Nest.js), REST API integration, and third-party APIs - Stripe, auth, maps. Database design, optimization, and DBA-level query tuning across PostgreSQL, MongoDB, and MySQL - the schema work a project needs from day one, not bolted on later. I also take existing codebases, including AI-generated ones, and harden them for production: bug fixing, performance, security, and stability.
🧩 WHERE I FIT
⬩ Build a SaaS MVP or web application from concept to deployment
⬩ Build the frontend for an existing backend, or the backend behind an existing UI
⬩ Get up to speed quickly, stabilize, debug, and improve a live product without rebuilding everything
⬩ Deliver a written scoping document before you commit to the full build
⬩ Augment your existing team with a vetted developer who can plug in quickly, without the delay of a full hiring process
🌟 ALSO IN REACH
When a web product needs a mobile companion, I extend into React Native. I take on Python developer work when a service calls for it, and I can migrate marketing surfaces off WordPress or Webflow into one unified React codebase - so the whole product lives in one place.
🔗 DOMAINS
SaaS platforms, marketplaces and two-sided / multi-vendor products, booking and rental platforms, fintech and Stripe-powered checkout, ecommerce, B2B dashboards, healthcare and internal tools. Marketplace and booking builds are home turf for our team.
🛠️ STACK
React, React.js, Next.js, JavaScript, TypeScript, Node.js, Nest.js, Express, REST API, Tailwind CSS, Bootstrap, HTML5, CSS3, PostgreSQL, MongoDB, MySQL, Stripe, Git, AWS, Vercel.
🤖 AI-NATIVE DELIVERY (FASTER, NOT SLOPPIER)
I build with agentic coding tools - Claude Code and MCP servers wired into my workflow - to move faster on scaffolding, refactors, test coverage, and code review. The difference: AI accelerates the work, but a senior engineer owns the architecture and ships it production-ready. It's exactly why clients bring me in to rescue vibe-coded, AI-generated codebases - I know where these tools cut corners, so you get the speed without the mess. I also integrate AI features (OpenAI and Claude APIs) into web apps and dashboards.
If you need a reliable full stack developer or react developer to build, maintain, and improve your web application - or a web developer who takes ownership of both the interface and what powers it - click Invite or Hire and let's scope it together.
Oleh P.
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Roobykon | Digital marketplace development company | Custom web development
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$23/hr
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Skilled 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 Engineer. I work mainly with Microsoft tools. Create strong, growing, and fast web applications using 𝐂# and .𝐍𝐄𝐓, along with modern ways to build the front end, like 𝐀𝐧𝐠𝐮𝐥𝐚𝐫 and 𝐑𝐞𝐚𝐜𝐭. I know all parts of making an application, from how the data is stored and how it's shared, to making good-looking and easy-to-use interfaces.
𝐈 𝐡𝐚𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡 𝐯𝐚𝐫𝐢𝐨𝐮𝐬 𝐟𝐢𝐞𝐥𝐝𝐬, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠:
🛒 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞: I have made and improved online shops. This includes connecting payment systems (like Stripe, PayPal), making shopping carts work, and managing what is in stock. I have made these shops work better, so more people buy things. (Example: Increased average order value by 15% through personalized product recommendations.)
💳 𝐅𝐢𝐧𝐭𝐞𝐜𝐡: I have built safe money applications, like online banks, payment systems, and ways to see financial data. I made sure these followed the rules and were very secure.
🏥 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞: I have created applications that follow health rules for managing patients, booking appointments, and keeping health records. I focused on making these easy to use and keeping the data safe.
🚚 𝐋𝐨𝐠𝐢𝐬𝐭𝐢𝐜𝐬: I have designed applications for planning the best routes, tracking where things are, and managing how goods are moved. This has made deliveries much more efficient. (Example: Reduced delivery times by 20% with optimized routing algorithms.)
In addition, I have built and looked after many 𝐒𝐚𝐚𝐒 applications using .NET. 🛠️
𝐓𝐡𝐚𝐭’𝐬 𝐰𝐡𝐚𝐭 𝐈’𝐦 𝐬𝐤𝐢𝐥𝐥𝐞𝐝 𝐢𝐧:
𝐁𝐚𝐜𝐤𝐞𝐧𝐝: C#, .NET Framework, .NET Core, ASP.NET (MVC, Web API), Entity Framework, SQL Server, RESTful API design and development, Web API, gRPC, Dependency Injection, LINQ, ORM
𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: JavaScript, TypeScript, Angular, React, HTML5, CSS3, State Management (Redux, NgRx), UI/UX Design, Responsive Design, SPA
𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: SQL, NoSQL, Database Design, Stored Procedures, Optimization
𝐂𝐥𝐨𝐮𝐝: Azure, AWS, Docker, Kubernetes
𝐎𝐭𝐡𝐞𝐫: Git, Agile, CI/CD, Unit Testing, Microservices Architecture, WebSocket
𝐋𝐞𝐭'𝐬 𝐭𝐚𝐥𝐤 about what you need and how my skills can help you succeed. Please contact me to discuss your project!
𝐁𝐞𝐬𝐭 𝐰𝐢𝐬𝐡𝐞𝐬, 𝐎𝐫𝐞𝐬𝐭
Below are mentioned keywords so you could find me easier :)
.NET Core, .NET Framework, .NET Web API, .NET to Laravel migration projects, AI App Development, AI design tools, API, API Development, API Integration, API microservices, ASP.NET, ASP.NET 4.8 Web Forms, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, Angular, Angular 15+, AngularJS, Auth0, Blazor, Bootstrap, Bruno, C#, C++, CSS, CSS3, Database Design, Database Development, Database Optimization, Desktop Application, Docker, Domain-Driven Design, Entity Framework, Excellent communication and collaboration abilities, Figma, Sketch, or similar, Front-End Development, Full-Stack Development, GDPR, Google Calendar API, GraphQL, HTML, HTML5, JSON, Java, JavaScript, Microservice, Microsoft Azure, Microsoft IIS, Microsoft SQL Server, Microsoft SQL Server Programming, Microsoft Visual Studio, MongoDB, MySQL, Network programming, Node.js, Nuxt.js, PHP, PostgreSQL, Proven track record of large-scale platform redesign projects, Python, QWBC, QuickBooks Enterprise, RESTful API, React, React Native, Responsive Design, Salesforce App Development, Salesforce Lightning, SEO optimization, Software Architecture & Design, SQL, Strong analytical and problem-solving skills, Telerik, TypeScript, UX & UI, User Interface Design, VB.NET, Web Application, Web Design, Web Development, Web development principles, Windows App Development, XML, Adobe Photoshop, Amazon EC2, Amazon Web Services, Azure DevOps, jQuery, backend.
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Inforce.digital
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$35/hr
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🏆 Why I'm a Top-Rated Full Stack Developer & .NET Developer
8+ years as a Full Stack Developer and .NET Developer, 60+ web apps shipped for US, UK and EU clients
I’ve earned +$60K on Upwork as a C# Developer and .NET Developer, 100% Job Success Score
As a Full Stack Developer, I've shipped 40+ releases combining React, Angular and ASP.NET Core
As a C# Developer, I cut API response times by 45% and infrastructure costs by 30% for a fintech client
As a .NET Developer, I migrated 3 legacy monoliths to .NET Core microservices, +70% deployment speed
💥 Recent win — as a Full Stack Developer and C# Developer, I rebuilt a logistics platform using .NET Core, Angular and MySQL, cutting order processing time by 55% and lifting client retention by 22%.
🟢 Most business platforms are slow, hard to scale and expensive to maintain. With 8+ years as a .NET Developer, C# Developer and Full Stack Developer, I architect scalable web developer solutions on .NET, Angular, React and Python stacks that turn technical debt into growth 🟢
📩 Send me your project brief — I'll reply with a free technical review within a few hours, covering architecture, performance and security.
⭐️⭐️⭐️⭐️⭐️ "She's an outstanding .NET Developer and Full Stack Developer. Reliable, communicative, and delivers clean, production-ready C# code every time."
🎯 WHY CLIENTS CHOOSE ME AS A FULL STACK DEVELOPER
I'm a Full Stack Developer, .NET Developer and C# Developer with full-cycle ownership — from database architecture and API design to pixel-perfect frontends. As a C# Developer, I write clean, testable code following SOLID principles, and as a Full Stack Developer I make sure the entire product, not just one layer, actually works for your users.
✔️ .NET Core & C# — as a .NET Developer and C# Developer: scalable ASP.NET Core APIs, background services, .NET MAUI apps
✔️ Frontend — React, Angular, Vue.js, jQuery, built for speed and clean UX
✔️ Full Stack Development — as a Full Stack Developer, connecting .NET, Node.js and Python backends to JavaScript frontends
✔️ Web Developer Services — as a web developer, WordPress, Laravel and PHP sites alongside custom .NET apps
✔️ Database Architecture — MySQL, SQL Server, API Integration for data-heavy systems
✔️ Cloud & DevOps — Azure, AWS, Docker, CI/CD, supporting .net full stack developer and full stack developer react deployments
📊 RESULTS THAT SPEAK
🔶 Fintech Platform: as a .NET Developer and C# Developer, -60% transaction errors, 99.9% uptime via a full .NET Core rebuild
🔶 E-commerce Marketplace: as a Full Stack Developer, React + .NET Core APIs, +28% checkout conversion, 3x page load speed
🔶 Healthcare SaaS: as a senior .net developer, HIPAA-compliant rebuild, -40% manual admin work
⚙️ TECH STACK — WHAT I ACTUALLY BUILD
✔️ As a C# Developer, I build backend services and APIs in C#, .NET and .NET Core
✔️ As a .NET Developer, I build enterprise systems on .NET Framework, deploy cross-platform apps with .NET MAUI, and ship RESTful APIs with ASP.NET
✔️ As a Full Stack Developer, I build frontend interfaces in React, Angular, Vue.js and JavaScript, and add type safety with TypeScript
✔️ As a Full Stack Developer, I build backend logic in Node.js and Python, and CMS-driven sites in PHP, Laravel and WordPress
✔️ As a web developer, I build responsive layouts with HTML5, CSS 3, Bootstrap and jQuery
✔️ As a Full Stack Developer, I build and manage data layers in MySQL and SQL Server
💼 EVERY PROJECT AS A FULL STACK DEVELOPER INCLUDES
▪️ Clean, well-documented C# and .NET code with automated testing
▪️ Direct communication, just a senior C# Developer / .NET Developer working on your project
▪️ Ongoing support after launch as your long-term Full Stack Developer and .NET Developer partner
🏭 INDUSTRIES
Fintech · Healthcare · E-commerce · Logistics · SaaS · Real Estate · EdTech
🔎 ALSO EXPERIENCED AS — EVERY ROLE, PROVEN TWICE
✔️ As a react developer, I build interactive dashboards for SaaS platforms. As a react developer, I also rebuild legacy UIs for speed and scale.
✔️ As a python developer, I build backend APIs and automation scripts. As a python developer, I also ship data-processing pipelines for reporting tools.
✔️ As a java developer, I build backend modules for enterprise systems. As a java developer, I also debug and refactor legacy Java codebases.
✔️ As a blockchain developer, I build and audit smart contracts. As a blockchain developer, I also integrate wallet and token logic into existing platforms.
✔️ As a mobile app developer, I build cross-platform releases for iOS and Android. As a mobile app developer, I also ship post-launch updates and bug fixes.
deployment pipelines.
🚀 LOOKING FOR A RELIABLE FULL STACK DEVELOPER OR .NET DEVELOPER?
👉 Share your project details and I'll reply with a clear technical plan. Hire a proven .NET Developer, C# Developer and Full Stack Developer who ships secure, scalable, production-ready software — on time, every time.
📅 Last updated: 04.08.2026
Associated with
NVCoding
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$10K+ earned
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🚀 Over 14 years and 320+ shipped products, we've helped startups and scaling businesses turn ideas into fast, profitable digital platforms. Our team has delivered 180+ custom web applications, 60+ mobile apps, and 40+ AI-powered software systems, each engineered to perform from day one and scale without friction.
I lead a senior full stack developer team with deep roots in both frontend and backend engineering. We've driven results that speak for themselves: load times reduced by up to 73%, API response times cut from 1.8s to under 200ms, and clients growing revenue by 3-5× after launching platforms we built. Whether the project calls for a dedicated React developer, a WordPress developer, a mobile app developer, or a complete full stack developer team owning end-to-end delivery, we've executed at scale across every major industry.
E-commerce and growth systems are core to what we do. Our full stack Shopify builds have processed $2M+ in Year 1 GMV. Custom React Shopify frontends we've engineered improved client conversion rates by 38%. Full stack ecommerce platforms we've shipped now serve 50,000+ daily active users. Full stack SEO is baked into our engineering process from day one, server-side rendering via React Next.js, structured data, Core Web Vitals optimization, helping clients rank on Page 1 for 400+ competitive keywords within 6 months of launch. SEO React architecture isn't an afterthought in our workflow; it's a first-class engineering requirement built into every frontend system we deliver.
Our React developers architect scalable component libraries used across teams of 15+ engineers and consistently deliver UI scoring 90+ on Lighthouse performance audits. On mobile, we've shipped 60+ cross-platform React Native mobile applications with 800,000+ combined downloads and an average 4.7★ app store rating. Every React Native developer on our team works across the full product lifecycle, architecture, development, App Store submission, and post-launch iteration, using React Native Expo for fast, reliable iOS and Android deployment.
Our WordPress developer practice has produced 90+ websites, from editorial platforms handling 500,000+ monthly visitors to WooCommerce stores carrying 10,000+ SKUs. Every website that leaves our team is performance-tuned, SEO-ready, and built so non-technical editors can manage it without touching a line of code.
The full stack developer team I lead operates across the entire technology stack. On the frontend: React, React TypeScript, React Next.js, Vue.js, Webflow, Tailwind CSS, and Bootstrap.
On the backend: Python, FastAPI, Django, Node.js, Laravel, PHP, REST APIs, and GraphQL.
Our Python developer capability covers data pipelines processing 2M+ records daily and backend APIs handling 100,000+ requests per hour. Infrastructure runs on AWS, Firebase, and Supabase, with CI/CD pipelines that compress deployment time to under 8 minutes.
We've delivered software across 15+ verticals including AI platforms, fintech, healthcare, legal document automation, education LMS, HR software, social media products, automotive ERPs, manufacturing systems, and digital marketing platforms with Meta, Google, and TikTok integrations.
Our AI-powered platforms have reduced client manual review time by 65%, improved lead qualification accuracy by 44%, and automated 1,200+ repetitive operational tasks per month.
The engagement model flexes to fit what you actually need. A solo React developer who owns frontend delivery end-to-end and ships a complete system in 6 weeks. A senior web developer who steps into an existing codebase, stabilizes releases, and reduces critical bug rates by 80% within 90 days, something we've done for 25+ companies. A full stack developer team scaling from 2 to 14 engineers mid-project without missing a single deadline. We've operated in every configuration and delivered in all of them.
Whatever the scope - a new website, a SaaS product, a scalable React frontend, a CMS platform, cross-platform mobile apps, or a complete backend system, my team has the full stack developer depth, the React developer precision, the web developer range, and the product engineering experience to build it right the first time.
14 years. 320+ products. Millions of users served. Let's build yours.
Associated with
EVNE Developers - Outcome-Based Delivery for Startups
$600K+
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$35/hr
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Built a 𝗙𝗼𝗿𝗯𝗲𝘀 𝗧𝗼𝗽 𝟐𝟓 𝗦𝗮𝗮𝗦 managing 𝟏𝟎𝟎,𝟎𝟎𝟎+ locations | 𝗔𝗜 𝗦𝗮𝗮𝗦 that grew to 𝟏,𝟒𝟎𝟎+ active users in 𝟔 months + generated revenue within 𝟐 months of launch.
🎯 𝗙𝗿𝗲𝗲 𝟑𝟎-𝗺𝗶𝗻𝘂𝘁𝗲 𝗱𝗶𝘀𝗰𝗼𝘃𝗲𝗿𝘆 𝗰𝗮𝗹𝗹 - 𝗼𝗻 𝗺𝗲.
Book it. I'll review your Laravel application, SaaS architecture, or product idea, identify technical bottlenecks, and recommend the fastest path to a scalable solution. No pitch decks. No fluff. Just clarity.
𝗪𝗵𝗼 𝗜 𝗮𝗺:
10+ years building digital products that 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘀𝗵𝗶𝗽. I've launched startups from zero, scaled SaaS platforms to thousands of users, rebuilt legacy Laravel applications, and delivered business systems that companies rely on every day.
My philosophy is simple: 𝗻𝗼 𝗯𝗹𝗼𝗮𝘁𝗲𝗱 𝘁𝗲𝗮𝗺𝘀, 𝗻𝗼 𝗯𝗶𝗹𝗹𝗮𝗯𝗹𝗲-𝗵𝗼𝘂𝗿 𝗴𝗮𝗺𝗲𝘀. You get focused development built around your business goals - not my convenience.
I work with founders, product teams, and growing companies that need an experienced Laravel Full-Stack developer capable of taking ownership of the entire product.
𝗪𝗵𝗮𝘁 𝗜'𝘃𝗲 𝗯𝘂𝗶𝗹𝘁:
📌𝗣𝗮𝗴𝗲𝗥𝗲𝘄𝗿𝗶𝘁𝗲𝗿 - AI Content SaaS Platform
🚀 𝟏,𝟒𝟎𝟎+ 𝗮𝗰𝘁𝗶𝘃𝗲 users in 𝟔 𝗺𝗼𝗻𝘁𝗵𝘀. Revenue within 𝟐 𝗺𝗼𝗻𝘁𝗵𝘀 of launch.
🔥 Built the complete Laravel application, multi-tenant architecture, AI integrations, authentication, billing, dashboards, APIs, and scalable infrastructure from the ground up.
📌 𝗚𝗲𝘁𝗽𝗶𝗻- Location-Based SaaS Marketing Platform
🚀 𝗧𝗼𝗽 𝟐𝟓 𝗙𝗼𝗿𝗯𝗲𝘀 Ukraine. 𝟏𝟎𝟎,𝟎𝟎𝟎+ 𝗹𝗼𝗰𝗮𝘁𝗶𝗼𝗻𝘀 managed. Investment-backed.
🔥 Led end-to-end product development - from architecture and backend services to dashboards, APIs, and business automation.
📌 𝗜𝗺𝗽𝗼𝗿𝘁𝟒𝗨 - Logistics Ordering Platform
🚀 Complete business launch from MVP to production-ready platform.
🔥 Full technical ownership including Laravel architecture, integrations, admin panel, business logic, and deployment.
𝗪𝗵𝗮𝘁 𝗜 𝘀𝗼𝗹𝘃𝗲:
- Legacy Laravel applications becoming difficult to maintain → clean architecture, modernization, and scalable codebases.
- Business processes spread across multiple systems → custom SaaS platforms, CRM/ERP development, and API integrations.
- Slow manual workflows → automation, queues, background jobs, and AI-assisted business processes.
- Products that need to scale → performance optimization, caching, microservices, and cloud-ready infrastructure.
𝗠𝘆 𝘀𝘁𝗮𝗰𝗸:
PHP · Laravel 11/12 · MySQL · PostgreSQL · Redis · REST APIs · Docker · RabbitMQ · WebSockets · Git · Linux · Nginx · Apache · CI/CD · PHPUnit · Pest · SOLID · DDD · Microservices · Blade · Tailwind CSS · Bootstrap
𝗔𝗜 & 𝗠𝗼𝗱𝗲𝗿𝗻 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: OpenAI · Claude · Cursor AI · GitHub Copilot · AI Agents · RAG · LangChain · MCP · Prompt Engineering · Vector Databases · Workflow Automation.
I actively use AI-assisted development ("vibe coding") to accelerate delivery while maintaining production-quality architecture and clean, maintainable code.
𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗜 𝗸𝗻𝗼𝘄 𝗰𝗼𝗹𝗱: SaaS · Logistics · eCommerce · CRM & ERP · Marketplaces · Booking Platforms · Marketing Platforms · Startups
𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗸𝗲𝗲𝗽 𝗰𝗼𝗺𝗶𝗻𝗴 𝗯𝗮𝗰𝗸:
✅ Full technical ownership - from MVP to enterprise-scale systems.
✅ Senior Laravel expertise with modern full-stack development.
✅ Fast delivery powered by AI-assisted development without compromising quality.
✅ Clean, scalable code built for long-term growth.
If your Laravel application is slowing your business down or you're building the next SaaS product from scratch - let's make it happen.
📩 Send a message, book the free call, and I'll help you decide what to build, what to automate, and how to scale it.
Associated with
Yarandin Incorp
$1K+
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$35/hr
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$900+ earned
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Full Stack Developer:
Exceptional 5.0⭐ feedback
100+ happy clients
100% Job Success Score
10+ years of certified experience (Node.js, React, Next.js, NestJS)
150+ projects successfully delivered as a Full Stack Developer
I’m a Full Stack Developer and CEO, focused on HealthTech, IoT, and AI-driven platforms. With over 10+ years of experience in the full stack developer field, I’ve personally helped healthcare startups, clinics, and wellness providers bring their platforms to life. I’m not just a CEO - I stay involved in every full stack project, from discovery to deployment. I regularly use Laravel , React , Python , React Native , Expo , Shopify , as well as AI integrations (OpenAI, LangChain) for analytics and personalization.
Whether it’s building a patient-facing mobile app, integrating wearables, or connecting with EHR systems, as a Full Stack Developer ai I care about getting the details right. As a Full Stack Developer I value long-term collaboration and take pride in building real 5⭐️ partnerships here on Upwork. I have solid experience as a Full Stack Developer working with Python and AI models, as well as developing user interfaces in React and integrating Shopify for e-commerce solutions.
What I bring like a Full Stack Developer & Web Developer:
🟢 11+ years of hands-on development experience as a Full Stack Developer - 30+ HealthTech products launched
🟢 Full Stack dev expertise – from scalable backends to intuitive frontends across web & mobile
🟢 My core stack: React, Node.js, React Native, Next.js
🟢 I use Python and AI to power features like wellness insights, sleep analytics, and behavior tracking
🟢 I’ve built Shopify stores for medical brands with custom flows and real-time data sync
🟢 I use HTML5, Tailwind CSS, Bootstrap, and JavaScript to create responsive, accessible interfaces
🟢 I know BLE inside and out
🟢 I’ve connected apps to EHR systems using HL7 and FHIR
🟢 Backend experience: Firebase, MongoDB, MySQL
Projects with real impact:
✔️ 57% faster response time for anxiety events (IoT mobile app)
✔️ 19% earlier detection of health risks in elderly care
✔️ 11% better sleep quality, 8% fewer apnea events using AI
✔️ 45% increase in engagement with BLE-based wellness trackers
✔️ 14% productivity boost, 17% fewer resource losses in IoT-enabled workflows
✔️ MVP launch time reduced by 40% using Expo + React Native + Firebase
✔️ SaaS product adoption grew by 23% after full-stack redesign with subscription logic and real-time updates
✔️Up to 57% faster care & 23% higher SaaS adoption
I can help you as a Full Stack Developer:
🟢 Custom web platforms using React + Node.js , like Full Stack Developer
🟢 Mobile apps in React Native - BLE-connected, native-feeling, cross-platform
🟢 Backend logic with Python - AI scoring, health tracking
🟢 Shopify storefronts for medical or wellness brands
🟢 EHR/EMR integration (HL7, FHIR, real-time data exchange)
🟢 BLE device integration with Firebase or custom backends
🟢 Web design that meets HIPAA, GDPR, and WCAG standards
🟢 Clean, maintainable APIs - or rescuing legacy codebases
I work as a Full Stack Developer confidently with HTML, HTML5, CSS, CSS3, Tailwind CSS, and Bootstrap to build responsive, modern interfaces. I use JavaScript, TypeScript, jQuery, React, React Native, and Redux for developing web and mobile apps. I also have basic experience with Angular and Vue.js and can pick them up quickly when needed.
On the backend, I use Node.js and Python, and work with SQL, MySQL, MongoDB, and Firebase to build secure, stable systems. I worked with Laravel and CodeIgniter, and PHP about 7 years ago and can refresh those skills if required. I handle REST and GraphQL APIs and have solid API integration experience.
I build cross-platform mobile apps for iOS & Android using React Native - including BLE, push notifications, and smartphone integrations. I'm familiar with Android App Development and iOS Development, and have real-world experience in Mobile App Development. I am mobile developer.
I use Git daily for version control and CI/CD. I develop Web Applications and handle Web Development and Full-Stack Development , from frontend to backend. I create accessible, UX-friendly Web Design. I have basic experience with WordPress and can edit or adapt existing themes.
I design scalable systems with a focus on clean architecture and maintainability (Software WEB Design). I also use Adobe Photoshop as a Full Stack Developer for basic graphic edits, design adjustments, and preparing mockups for development.
Send me a message, I'm a Full Stack Developer with HIPAA compliance
$35/hr
100%
Job Success
$100K+ earned
Available now
Offers consultations
Start of list.
End of list.
Full-stack developer (with 10+ years of experience) for SaaS and MVP delivery with AI/LLM features (Node.js/NestJS, React/Next.js, TypeScript, PostgreSQL). 20,000+ users joined the waitlist for a product we built with our team.
I’m a senior full-stack developer building B2B SaaS, multi-tenant products, marketplaces, internal tools, and AI-powered product features. As a full-stack developer, I design backend + frontend together so the platform stays clean, secure, and scalable from MVP → v1 → growth.
🤝 Working model (solo or team)
You work with an engineer from our team on Upwork - no unnecessary bureaucracy.
Need one full-stack developer - we’ll assign the best fit. Need a team - we’ll scale with the right people.
🧩 What I build as a full-stack developer (SaaS, MVP, B2B platforms)
As a full-stack developer, I ship:
* B2B SaaS platforms & multi-tenant products (subscriptions, RBAC, teams)
* MVPs that can grow into v1 without rewrites
* Marketplaces & booking platforms (catalog, vendors, inventory, payments, commissions)
* Internal tools, admin dashboards, back-office systems
* Customer/partner portals with role-based access
* Data-heavy apps (workflows, forms, filtering, reporting)
If you’re hiring a full-stack developer because this is a real platform (users + data + business logic), that’s exactly my lane.
⚙️ Full-stack developer coverage (backend, APIs, data, security)
As a full-stack developer, I cover:
* Architecture: modular monolith by default; microservices only when justified
* APIs: REST, webhooks, clear contracts for frontend/partners
* Integrations: Stripe/Stripe Connect, PayPal, CRMs, email, third-party APIs
* Data: PostgreSQL/MySQL schemas, migrations, indexing, performance tuning
* Security: JWT/sessions, RBAC/permissions, rate limiting, audit logs
* Stabilisation: refactors, tests, regression reduction, reliability improvements
You get a full-stack developer who can build new features and keep the codebase maintainable.
🤖 AI / LLM features (product-grade, not demos)
As a full-stack developer, I implement AI features that actually fit into a SaaS product:
* LLM integration (OpenAI or similar) for summarisation, extraction, classification, routing
* Embeddings + RAG-style retrieval over docs/knowledge bases/internal data
* AI assistants inside the product (support, onboarding, internal ops tools)
* Prompt/version management + safe fallbacks (so the feature doesn’t break the product)
If AI doesn’t add ROI, a good full-stack developer keeps the solution simple and stable.
🛠 Tech stack (focused)
Frontend
* React, Next.js, TypeScript, Tailwind / component systems
Backend
* Node.js, NestJS, Express
Data
* PostgreSQL, MySQL, MongoDB, Redis
AI
* LLM integrations, embeddings, RAG pipelines
Delivery
* Docker, CI/CD, AWS (EC2/ECS/RDS/S3)
🔄 How I work (SaaS/MVP delivery)
Working with me as your full-stack developer:
* Quick discovery (goals, users, constraints, integrations)
* MVP scope → clear milestones → predictable releases
* Clean code, docs, and stable handoff-ready setup
* Long-term support and iteration after launch
✅ When we’re a good match
* You need a full-stack developer for SaaS/MVP work (multi-week product delivery)
* You want ownership across frontend + backend + integrations
* You need AI/LLM features implemented like product features, not a hacky demo
* You care about readable code and long-term maintainability
Last updated: 31 May 2026
Vitalii M.
has worked
.
$24/hr
100%
Job Success
$20K+ earned
Available now
Offers consultations
Start of list.
End of list.
Hey! You are here to find a Full-Stack Developer who can deliver real results.
I specialize in building scalable, high-performance web applications using React, Next.js, Node.js, NestJS and TypeScript - helping startups and businesses turn ideas into reliable, production-ready products.
🚀Whether it’s a SaaS platform, dashboard, marketplace, or AI-powered app - I handle everything from frontend UX to backend architecture and deployment.
✨ What I bring to the table
Fluent English & strong communication - clear, fast, and transparent collaboration
4+ years of full-stack experience in real-world projects
Ownership mindset - I don’t just code, I take responsibility for the result
Reliable delivery - clean code, on time, without surprises
Experience working independently and in teams (Scrum, Agile)
Strong focus on performance, scalability, and user experience
🛠️ Tech Stack
Frontend Development
React · Next.js (SSR, App Router) · TypeScript · Redux / Zustand · TanStack Query
Tailwind CSS · Material UI · Shadcn UI · styled-components · SCSS/Sass
Forms: React Hook Form + Zod/Yup
Data Visualization: Chart.js · Recharts · ApexCharts
Backend Development
Node.js · Express.js · NestJS
REST APIs · GraphQL · WebSockets / Socket io
Authentication: JWT · Auth0 · OAuth
Databases & Storage
PostgreSQL · MongoDB · Firebase · Supabase · Neo4j · Pinecone
File storage & media handling
Integrations
Stripe (payments) · Twilio (SMS) · SendGrid (email) · OpenAI API
Algolia · ElasticSearch
DevOps & Cloud
Docker · CI/CD · GitHub Actions · GitLab
AWS (EC2, Lambda, S3, RDS, Cognito, API Gateway)
Vercel · Netlify
Testing & Quality
Jest · Mocha · Supertest · Postman
⭐ Why clients choose me
🧠 I solve business problems, not just technical tasks
I think beyond code - suggesting better architecture, UX improvements, and scalable solutions.
⚡Fast and efficient development
I know how to deliver quickly without sacrificing quality - important for MVPs and fast-growing products.
🔁Full-cycle development
From idea → architecture → development → deployment → scaling
You don’t need multiple developers - I cover the whole process.
🧩 Clean, maintainable code
Well-structured, documented, and easy to scale - so your project won’t turn into technical debt.
📈 Focus on results
My goal is not just to build features, but to help you grow your product and business.
🤝 Easy to work with
Responsive, proactive, and always aligned with your goals.
Let’s work together!
Have an idea, MVP, or existing product to improve?
I propose to discuss - I’ll help you define the best technical approach and deliver a solution that works 🚀
Olha S.
has worked
.
Associated with
Incode Group
$900K+
earned
$40/hr
100%
Job Success
$60K+ earned
Available now
Offers consultations
Start of list.
End of list.
Senior full-stack engineer specializing in .NET, Node js, Azure, and AI-powered solutions that cut development time and operational costs. I integrate LLMs (Claude / Anthropic API, OpenAI) directly into applications — shipping real production features, not just prototypes.
With over 10 years of experience in software development, I've had the privilege of collaborating with companies across Germany, the United Kingdom, Australia, and the USA. I specialize in building AI-powered and AI-automated solutions that reduce development time and operational costs for my clients.
My core stack: .NET, Node js, Angular, React Native, Next.js, Docker, Azure, Headless CMS, MSSQL, PostgreSQL, Cosmos DB, and MongoDB. I also work with MCP servers, Claude Code, and AI-assisted development pipelines to accelerate delivery without sacrificing code quality.
My journey has taken me through enterprise projects from inception to completion, giving me a comprehensive understanding of the full development lifecycle. I focus on crafting robust, scalable solutions — now augmented with AI automation where it genuinely adds value: marketplace integrations, data enrichment, intelligent document processing, customer support automation, and developer tooling.
In summary, I combine 10+ years of full-stack engineering with real, production experience using Claude and modern AI tooling. With a keen eye for detail and a commitment to excellence, I help clients ship faster, automate smarter, and deliver cutting-edge software solutions.
Den M.
has worked
.
$24/hr
100%
Job Success
$100K+ earned
Available now
Offers consultations
Start of list.
End of list.
🏆 TOP RATED PLUS | 100% Job Success | 9+ Years Building Web Products
👋 Welcome! If you found my profile, you're looking for someone who can turn an idea into a polished, scalable, revenue-generating product and ship it without drama. You're in the right place.
I'm a Top Rated Plus full-stack engineer in the top 1% of Upwork talent, with 9+ years of professional web development, 6 years on Upwork, and a 100% Job Success Score. I specialize in React, NextJS, NodeJS, NestJS and TypeScript, plus everything needed to build fast, modern, reliable applications.
📊 BY THE NUMBERS
• 🏆 Top Rated Plus, top 1% of Upwork freelancers
• ✅ 100% Job Success Score
• ⭐ 6 years on Upwork
• 💻 9+ years of successful web development
• 🚀 7+ years of full-stack delivery
• 🔁 Long-term clients & high repeat-hire rate
• 🗣 Fluent English, clear and proactive communication
🔥 WHAT I BRING
• Senior-level architecture and system design
• Clean, documented, modular, scalable code
• On-time delivery, even under tight deadlines
• Full ownership: concept → architecture → development → release
• Proactive collaboration with founders, PMs and designers
🛠 CORE EXPERTISE (years of hands-on experience)
▸ FRONTEND
JavaScript 9+ yrs · React 9+ yrs · HTML5/CSS3 9+ yrs · TypeScript 7+ yrs · NextJS 6+ yrs · Redux 7+ yrs · Zustand 3+ yrs · SCSS/SASS/LESS 8+ yrs · Tailwind 4+ yrs · Material UI 6+ yrs · Ant Design 4+ yrs · styled-components 5+ yrs · Storybook 4+ yrs · TanStack Query 4+ yrs · Vite/Webpack 6+ yrs · ChartJS, Recharts, ApexCharts, Highcharts, D3 5+ yrs
▸ BACKEND
NodeJS 8+ yrs · Express 8+ yrs · NestJS 5+ yrs · REST API 8+ yrs · GraphQL 5+ yrs · WebSockets/Socket IO 5+ yrs · Microservices 5+ yrs · Prisma/Drizzle/TypeORM 5+ yrs
▸ DATABASES
PostgreSQL 7+ yrs · MongoDB 7+ yrs · MySQL 6 yrs · Redis 4+ yrs · Firebase 5+ yrs · Supabase 3+ yrs · Neo4j 2+ yrs · Pinecone 2+ yrs
▸ CLOUD & DEVOPS
AWS (EC2, Lambda, S3, RDS, Cognito, CloudWatch, API Gateway, Amplify) 6+ yrs · Docker 6+ yrs · CI/CD (GitHub Actions, GitLab) 5+ yrs · Vercel/Netlify/Nginx 5+ yrs
▸ AI & AUTOMATION
Claude Code (daily driver since its 2025 launch) · AI integration: OpenAI, Anthropic, LangChain, RAG 3+ yrs · Vector DBs & semantic search 2+ yrs · n8n 2+ yrs
▸ INTEGRATIONS & TOOLS
Stripe 6+ yrs · Twilio · SendGrid · Algolia · Elasticsearch · RabbitMQ · Auth0/OAuth/JWT/Cognito · Jest, Mocha, Cypress, Playwright · Agile/Scrum, Jira, Git
👥 MY TEAM
I work with the INCODE Group, a team of senior engineers and designers covering web, mobile (Flutter, React Native), UI/UX, backend and DevOps. From MVPs to complex multi-service platforms, we handle projects of any scope.
🌟 WHY CLIENTS HIRE ME
♟ Strategic problem solving: more than "just a developer." I refine requirements and suggest smarter solutions.
🤝 Full ownership: one accountable person driving the entire flow.
🦾 Quality & scalability: clean, modular code ready to scale with your user base.
💼 Proven results: I help clients ship faster, increase revenue and improve engagement.
❓ Tell me about your idea and I'll help shape it into something users love. 📩 Send me a message anytime.
Specialization: full stack developer, full stack web developer, react developer, nextjs developer, nodejs developer, nestjs developer, typescript developer, javascript developer, frontend developer, backend developer, backend engineer, web developer, saas developer, ai saas developer, ai integration developer, openai developer, langchain developer, rag developer, chatbot developer, dashboard developer, crm developer, marketplace developer, e-commerce developer, fintech developer, real-time app developer, websocket developer, graphql developer, rest api developer, microservices, postgresql, mysql, mongodb, supabase, firebase, redis, prisma, aws developer, aws devops, aws lambda, serverless developer, docker developer, ci/cd, stripe integration, twilio, headless cms, strapi, sanity, tailwind developer, react native, mvp development, web design, top rated plus developer, ai-native, ai-first, claude code, chatGPT, OpenAI
Anatoliy B.
has worked
.
Associated with
Incode Group
$900K+
earned