"He took our legacy SaaS codebase from 520K lines down to 80K. 400% speed boost in development velocity, with zero downtime for our 5000+ users.", โ Founder of EdTech Platform
๐ Senior Full Stack Developer | 6+ years in Next.js, Node.js, React, Laravel and AI SaaS
โ ABOUT ME
8+ years and 45+ products delivered as a Senior Full Stack Developer specializing in Platform, MVP, AI-Powered and Web Application delivery on Next.js and Node.js.
$4.2M+ client impact and $1.1M+ direct revenue as a Senior Full Stack Developer working across React, Next.js and Node.js.
22,000+ active users across Web + Mobile products where React frontend paired with Node.js backend lifted engagement by 18-27%.
12,000+ users across Fintech and Payments platforms where a Senior Full Stack Developer's Next.js ownership cut reconciliation time by 40%.
2,600+ completed orders, 520+ registered customers in an Ecommerce and CRM Platform MVP delivered as a Senior Full Stack Developer on Next.js.
90% faster order processing, 80% lower manager workload through workflow automation and React improvements as a Senior Full Stack Developer on Node.js.
1,800+ catalog items, 4-role access, 2.8x operational capacity in a B2B SaaS Marketplace built as a Senior Full Stack Developer on Next.js and Node.js.
5-8 weeks shorter MVP-to-pilot launch, 35% fewer bugs through codebase stabilization and SaaS productionization work as a Senior Full Stack Developer.
$1.1M+ in client revenue as a Senior Full Stack Developer on Next.js and React, 8+ years as a Node.js engineer.
18-27% engagement lift, 30-40% faster cycles, cleaner UX and stronger retention as a Senior Full Stack Developer on React, Next.js and Node.js.
As a Senior Full Stack Developer, I treat every build as a long-term SaaS asset, not a one-off delivery.
โ WHERE I DELIVER
As a Senior Full Stack Developer on React - 20+ SaaS systems with UI development, dashboards and responsive builds across SaaS Platform, Booking Platform and Ecommerce SaaS products.
As a Senior Full Stack Developer on Next.js - 15+ SaaS launches, 30-40% faster iteration through design-to-code and component work.
As a Senior Full Stack Developer on Node.js - 25+ end-to-end SaaS builds with backend APIs, data architecture and secure, scalable systems from early-stage MVP to live SaaS Platform.
As a Senior Full Stack Developer across React and mobile app builds - UI polish and mobile improvements boosting conversion by 15-22% on SaaS products.
10+ deployed mobile SaaS apps in the App Store and Google Play as a Senior Full Stack Developer.
12-19% better repeat usage through booking, notifications and payments on SaaS platforms built as a Senior Full Stack Developer.
As a Senior Full Stack Developer with Python and Django experience - 12+ backend-heavy SaaS products, 28% lower delivery risk.
As a Senior Full Stack Developer - 6-18 month cycles scaling existing SaaS platforms as a long-term partner, holding 99%+ delivery consistency across distributed SaaS teams on React, Next.js and Node.js.
โ INDUSTRY IMPACT
Marketplace, B2B SaaS - 55,000+ active listings, 20%+ better lead quality and a 35% increase in conversion rates as a Senior Full Stack Developer on React and Next.js handling $2.3M+ in monthly SaaS transaction volume.
Fintech SaaS, Payment Orchestration, PSP Integrations - 12,000+ transactions processed daily, 500+ merchant accounts onboarded, 25%+ faster settlement and 15% fewer failed payments as a Senior Full Stack Developer maintaining 99.9% SaaS uptime on Node.js.
AI-Powered SaaS - 6+ products deployed, custom AI agents, RAG chatbots, OpenAI and Claude API integrations as a Senior Full Stack Developer on React and Node.js, processing 16,000+ daily prompts and cutting query time by 40%.
Logistics SaaS, ERP - up to 12 hours saved per order cycle, 30%+ faster reporting and a 40% reduction in data-entry errors across 5+ regional hubs as a Senior Full Stack Developer on Next.js.
Fintech SaaS, PropTech SaaS, LegalTech SaaS - 18% better adoption, 40% higher retention over 6 months and structured permissions managing 5,000+ users as a Senior Full Stack Developer on React.
โ HOW I BUILD
25+ SaaS products as a Senior Full Stack Developer on React: React Native, Next.js, TypeScript, JavaScript, HTML5, CSS3, Tailwind, Responsive Design.
15+ SaaS systems as a Senior Full Stack Developer on Node.js: PostgreSQL, MySQL, MongoDB, Firebase, Stripe, integrations across payment, maps, auth and third-party APIs.
10+ SaaS ecosystems as a Senior Full Stack Developer: WordPress, Shopify, PHP, Flask, Python, Django, MERN stack on Next.js and Node.js.
40+ SaaS products as a Senior Full Stack Developer: Git, software architecture, front-end development with an engineer's mindset applied to every SaaS Platform I ship.
Let's turn your idea into a scalable product with your Senior Full Stack Developer.
Node.js
JavaScript
MongoDB
Web Application
React
Next.js
TypeScript
Full-Stack Development
Web Development
API Development
React Native
PostgreSQL
SaaS Development
Tailwind CSS
PHP
Supabase
Front-End Development
CSS
HTML
API
Mykola P.
Rivne, Ukraine
$30/hr
4.9
103 jobs
๐ ๐๐ง๐ฒ๐จ๐ง๐ ๐๐๐ง ๐ ๐๐ง๐๐ซ๐๐ญ๐ ๐๐ ๐๐จ๐๐. ๐๐ฎ๐ญ ๐ ๐ฆ๐๐ค๐ ๐ข๐ญ ๐ฌ๐๐๐ฎ๐ซ๐, ๐ซ๐๐ฅ๐ข๐๐๐ฅ๐, ๐ฌ๐๐๐ฅ๐๐๐ฅ๐, ๐๐ง๐ ๐ฉ๐ซ๐จ๐๐ฎ๐๐ญ๐ข๐จ๐ง-๐ซ๐๐๐๐ฒ.
๐ฅ 85+ completed projects (40+ SaaS & MVP platforms) delivered as a Full Stack Developer & React Developer
๐ฐ Startup MVP platforms generated $500K+ revenue in their first 6 months
๐ฅ SaaS products supporting 10Kโ50K active users built by an expert Full Stack Developer
๐ One platform grew from 2K to 7K users through continuous product updates by a Web Developer
โก Backend systems processing 300Kโ500K API requests every month
๐ Startup MVPs delivered in 2โ4 weeks (complex Startup MVP delivered in just 2 days by a Full Stack Developer)
โฑ๏ธ Optimized AI dashboard loading times from 2 minutes down to 3 seconds for 10Kโ50K active users
๐ฌ Video generation architecture supporting a heavy load of several thousand concurrent users
๐ 5+ years building SaaS platforms & Startup MVPs as a professional Full Stack Developer
๐ฆ 100+ API integrations completed across production systems by a Full Stack Developer
โ๏ธ 20+ backend architectures designed from scratch for Mobile App Developer projects
๐ง AI integrations across 30+ commercial projects as a React Developer & Full Stack Developer
๐ผ I help founders build SaaS platforms, Startup MVPs, AI applications, Customer Portals, Marketplaces, and scalable Web Applications using React, Next.js, Node.js, Supabase, PostgreSQL, Stripe, Redis, and AI APIs as a Full Stack Developer.
๐ ๏ธ As a SaaS Developer, MVP Developer, Full Stack Developer, Software Developer, React Developer, WordPress Developer, Mobile App Developer, and Web Developer, I've delivered 85+ production projects (40+ SaaS & MVP platforms). As a Full Stack Developer, I help startups validate ideas, launch products in 2โ4 weeks (complex MVP platforms in 2 days), and scale apps supporting 10Kโ50K active users with $500K+ revenue milestones.
๐ Many companies hire me as a SaaS Developer, MVP Developer, Full Stack Developer, Startup Developer, React Developer, WordPress Developer, Mobile App Developer, Web Developer, and AI SaaS Developer. As a Full Stack Developer, I build products designed to scale. Systems I've developed as a Full Stack Developer process 300Kโ500K API requests monthly, integrate 100+ APIs, support 10Kโ50K active users, and grow years after MVP launch, generating $500K+ revenue.
๐ฏ Unlike many Software Developers, WordPress Developers, or basic Web Developers, I focus on the entire product lifecycle as a Full Stack Developerโfrom MVP planning to production infrastructure, subscription systems, customer portals, and SaaS scalability. Whether you need a Full Stack Developer and React Developer for an AI dashboard or a Mobile App Developer for a cross-platform release, I deliver results.
๐ Why Founders Hire Me as a SaaS Developer & Full Stack Developer:
5+ years working as a SaaS Developer, MVP Developer, React Developer, WordPress Developer, Mobile App Developer, Web Developer, and Full Stack Developer.
As a Full Stack Developer, I delivered 85+ projects, including 40+ SaaS & MVP platforms supporting 10Kโ50K active users.
Startup MVP delivered in 2โ4 weeks (complex MVP platforms in 2 days) by an expert Full Stack Developer.
Production-ready products supporting 10Kโ50K active users after launch designed by a Full Stack Developer.
One Startup MVP built by a Full Stack Developer generated $500K+ revenue during its first 6 months.
One SaaS platform grew from 2K to 7K users through feature releases managed by a Full Stack Developer.
Backend systems processing 300Kโ500K API requests every month created by a Full Stack Developer.
100+ API integrations (Stripe, Supabase, OpenAI, CRMs, payment gateways) completed by a Full Stack Developer.
As a Full Stack Developer, I optimized AI dashboard loading times from 2 minutes down to 3 seconds for 10Kโ50K users.
Built high-load video generation systems supporting several thousand concurrent users as a Full Stack Developer.
Redis optimization reducing database load by 70%+ on high-traffic SaaS platforms supporting 10Kโ50K active users.
React performance optimization improving Lighthouse scores to 90+ and reducing bundle sizes by 40%+ as a dedicated React Developer and Full Stack Developer.
Experience building subscription platforms, customer portals, internal business systems, marketplaces, admin dashboards, WordPress Developer setups, Mobile App Developer integrations, and multi-tenant SaaS applications as a Full Stack Developer.
Production architecture designed by a Full Stack Developer to support years of growth and generate $500K+ revenue.
๐ ๐ Startup Growth & Production Software with a Full Stack Developer
As a SaaS Developer, MVP Developer, React Developer, Web Developer, WordPress Developer, Mobile App Developer, and Full Stack Developer, I help founders launch complex MVPs in 2 days and build scalable software capable of supporting 10Kโ50K users and generating $500K+ revenue.
Node.js
JavaScript
Web Application
React
HTML
Angular
Python
CSS
SaaS
Git
Software Development
WordPress
MySQL
Bootstrap
PHP
Web Design
CSS 3
HTML5
Vue.js
Full-Stack Development
Yuliia U.
Zaporizhzhia, Ukraine
$35/hr
4.7
47 jobs
๐ Hi, I'm Julia - your reliable tech partner
โ 9+ years in software development
โ 41+ jobs on UpWork
โ 155+ web and mobile projects delivered
โ 20,500+ Upwork hours in React / Next.js / Node.js / React Native
โ 75% repeat clients - partnerships lasting 6-18+ months
โ 40+ MVPs released, 5-8 weeks from MVP to pilot launch
โ 35+ in-house engineers, matching in 24 hours or less
โ 2-week trial period - you risk nothing
โ Products we support include platforms with 5M+ daily users
My team helps companies hire in-house, CTO-approved engineers who join fast, take ownership, and deliver production-ready software. My goal: save up to 40% of your budget and still get a market-ready, stable, scalable product.
Why teams choose us:
๐น In-house, not freelance-marketplace roulette. Every engineer is personally screened and approved by our CTO before joining your project.
๐น Speed without chaos. Engineer matched within 24h, weekly demos, code review and QA on every delivery.
๐น Ownership. Our engineers don't wait for tickets - they flag risks, suggest architecture improvements, and drive the product forward.
๐ How we work: Discovery & technical planning โ engineer matching within 24h โ 2-week trial โ weekly demos and reports โ CTO-approved delivery with code review and QA โ long-term support after launch.
๐ React / Next.js / Full Stack
We build SaaS platforms, marketplaces, dashboards, admin panels, CRMs, and scalable web apps as react developer, react js developer, nextjs developer, next js developer, web app developer react, full stack developer react node, and full stack developer supabase react. Stack: React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, Firebase, MongoDB, REST API, GraphQL, Stripe, OAuth, WebSockets, AWS, Vercel, Docker.
MVP development, legacy code takeover, architecture modernization, Core Web Vitals, API integrations, payments, auth, subscriptions, user roles, production launch. A strong fit if you need a react developer, frontend developer react, web developer, full stack developer, mern developer, or backend engineer.
๐ฑ React Native / Mobile
iOS and Android apps as react native developer, react native developer expo, react native app developer, mobile app developer. React Native, Expo, Firebase, Supabase, Node.js, API-driven architecture. App takeover, maintenance, push notifications, App Store / Google Play releases, payments, backend integrations. Mixed environments: flutter developer, android developer.
๐ค AI SaaS / AI Development
25+ AI products and features shipped: AI SaaS, AI MVP, AI chatbot development, AI agent development, RAG chatbot, copilots. Stack: OpenAI API, Claude API, LLMs, RAG, prompt engineering, Generative AI, Python, FastAPI, pgvector, web scraping, automation, AI workflow validation.
๐งฉ Mixed-Stack Support
Core focus: React, Next.js, Node.js, React Native, TypeScript, Supabase, AI. We also support wordpress, vue, angular, python developer, scala developer, and other web/mobile technologies.
๐ Industries
๐ฆ Logistics - 5+ projects: tracking, shipment dashboards, carrier/shipper workflows, maps
๐ฅ HealthTech - 4+ projects: medical booking, clinic platforms, patient flows
๐ Marketplaces & E-commerce - 15+ projects: multi-vendor, Stripe, subscriptions, bidding, complex search
๐ PropTech - 5+ projects: listings, booking flows, agent dashboards, rental platforms
๐ค AI Startups - 25+ products: chatbots, agents, copilots, OpenAI / Claude integrations
๐ฐ FinTech - 3+ projects: Stripe Connect, billing, payment flows, invoicing
๐ฎ Gaming - 5+ projects, incl. 2 major global gaming brands: dashboards, analytics, real-time
๐ EdTech - 5+ projects: student dashboards, progress tracking, content platforms
๐ฃ MarTech - 1 global market-leading project: analytics, segmentation, workflows
โฝ SportsTech - 10+ projects: live data, events, rankings, stats, mobile apps
๐ Building a SaaS, MVP, marketplace, React app, Next.js platform, React Native app, or AI product?
Click "Invite" or "Hire" - I'll help you clear the estimate or discovery phase within 24 hours or less.
Node.js
JavaScript
jQuery
MongoDB
React
HTML
CSS
Bootstrap
Front-End Development
TypeScript
Redux
React Native
Next.js
Web Development
Supabase
Stripe
Full-Stack Development
Software Development
AI Development
Redux Saga
Anton M.
Sofiyivska Borschagivka, Ukraine
$40/hr
5.0
96 jobs
Hi, Iโm a senior full-stack developer and product-minded engineer. I operate as a Full Stack Developer who thinks in terms of business value rather than just tickets. Over the last decade, I've led and coded complex web products for clients across Europe, the US, and the UK. As a Full Stack Developer and Backend Developer, I partner with founders, product owners, and marketing leaders who need a reliable technical partner to build SaaS platforms, CRMs, marketplaces, mobile apps, and high-performance websites.
My work covers the full spectrum of Full Stack Developer responsibilities. As a Backend Developer, I architect scalable APIs and database structures using PHP (Laravel), Node.js, and Python. On the frontend, I build with React, Vue, and Angular. This Full Stack Developer versatility extends to React Native for mobile, where I function as a Mobile App Developer, and to custom WordPress solutions, where I serve as a WordPress Developer. Whether it's a Python Full Stack Developer scenario with Django/FastAPI or a .NET Full Stack enterprise environment, I adapt.
โ๏ธ What I Do Best
Full Stack Developer ownership from architecture to launch and support.
Backend Developer focus on SaaS platforms, booking engines, and internal tools.
Full Stack Developer React Node ecosystems: interactive dashboards and complex workflows.
WordPress Full Stack builds that are fast, secure, and easy for marketing teams to edit.
Mobile App Developer delivery via React Native, fully integrated with custom backends.
Senior Fullstack Developer guidance for integrations: CRMs, ERPs, payment gateways, and custom APIs.
๐ Real Project Examples
๐ฆ Self-Storage Ecosystem (EU)
As lead Full Stack Developer and Backend Developer, I built a booking tool with ERP and payment automation (Full Stack Developer Laravel stack with Vue). This Full Stack Developer work took online reservations from zero to 170+ monthly and tripled signed contracts.
๐ EdTech Matching Platform
As Senior Fullstack Developer, I delivered three interconnected applications (Laravel/Vue) with a matching engine and accounting integrations. The Full Stack Developer React Node architecture increased sales by 190% year-over-year while keeping operations lean.
๐พ Social Utility App for Pet Owners
Acting as both Mobile App Developer and Backend Developer, I built a React Native app and Laravel backend with maps, social features, and AI helpers. This Full Stack Developer project seamlessly blended native mobile and web.
๐ SEO Analytics SaaS
In a Python Full Stack Developer role, I designed microservices with FastAPI and Node.js for high-load APIs and React frontends. The Full Stack Developer architecture processes thousands of active users reliably.
๐งน Cleaning Service Group Automation
As a WordPress Developer and Full Stack Developer PHP expert, I built a custom CRM/ERP with scheduling and telephony integrations. The Web Developer and Backend Developer work automated coordination across three brands.
๐ Tech I Use Daily
Backend: PHP (Laravel, Filament), Node.js, Python
Frontend: React, Vue, Nuxt, Alpine.js
CMS: Custom WordPress Full Stack themes and plugins
Mobile: React Native (I function as a Mobile App Developer)
DB: MySQL, PostgreSQL, Redis
DevOps: AWS, Docker, CI/CD
APIs: Stripe, Mollie, Google API, OpenAI
๐ค How I Work
โ I own delivery as a Full Stack Developer: architecture, code quality, and deadlines.
โ I'm transparent about scope and risks as your Backend Developer partner.
โ I take Full Stake ownership of outcomes, not just outputs.
โ I can join ongoing projects or build from zero to scale.
โ I act as a Web Developer and Senior Fullstack Developer who bridges technical execution with business impact.
๐ก Why Clients Choose Me as Their Full Stack Developer
Beyond writing clean code, I function as a true Full Stack Developer consultant. I've rescued stalled projects, modernized legacy PHP systems, and transitioned businesses from manual spreadsheets to fully automated WordPress Full Stack portals. As a React Developer at heart, I ensure every interface is intuitive and fast. Whether you need a Mobile App Developer for a companion app or a Backend Developer to untangle complex data flows, I bring Full Stack Developer React Node expertise and a Full Stake mindset to every engagement. My experience across .NET Full Stack environments and as a Python Full Stack Developer ensures I can evaluate the right tool for your specific business challenge, not just the one I know best. I'm comfortable acting as a fractional CTO or a Senior Fullstack Developer embedded with your existing team.
As a Full Stack Developer and Backend Developer, I deliver React, Node.js, PHP, Mobile App Developer results, WordPress Developer sites, Python Full Stack Developer APIs, .NET Full Stack insights, and Full Stake commitment. Senior Fullstack Developer ready.
Node.js
JavaScript
Web Application
PHP
React
API
Laravel
HTML
API Integration
CSS 3
Software Development
HTML5
Git
MySQL
Web Design
API Development
Database Architecture
Mobile App Development
Bootstrap
Django
Mykhailo D.
Lviv, Ukraine
$39/hr
4.9
86 jobs
โญ๏ธFounders come to me after a freelancer disappeared mid-project. I finish what they started, and I don't ghost.
๐ก 130+ production-grade products shipped (SaaS, MVPs, AI systems, marketplaces)
๐ฐ $16.5M+ revenue generated for client products
๐ฅ 160K+ active users powered by systems I built
โก 1M+ API requests/month at 99.9% uptime
๐ MVP โ production in 2โ6 weeks, built to scale from day one
๐ฅ WHAT I DO
Building a SaaS, MVP, or AI-powered product? You need a Full Stack Developer who owns React frontend and Node.js backend end-to-end, ships in weeks (not quarters), and writes code your future team won't throw away. That's what I do.
Early-stage MVP, productionizing a prototype, scaling a live SaaS platform, or rebuilding a legacy codebase โ I've done it on React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, AWS for over 10+ years.
๐ฅ ROLES I TAKE ON (10+ YEARS EXPERIENCE)
โ Full Stack Developer / Full Stack Engineer โ 40+ end-to-end SaaS platforms (React + Node.js), 10+ years
โ Frontend Developer / Front-End Developer โ 30+ production UI builds, 10+ years
โ React Developer / React.js / ReactJS Developer โ scalable React apps since 2015, 10+ years
โ Node.js / NodeJS Developer / Backend Developer โ 25+ APIs, 1M+ req/month, 10+ years
โ Vue.js Developer / Nuxt.js Developer โ 8+ Vue projects, 8+ years
โ Next.js Developer / NextJS Developer โ 15+ SSR/SSG SaaS platforms, 7+ years
โ TypeScript Developer / JavaScript Developer โ 50+ typed and untyped JS codebases, 10+ years
โ SaaS Developer / Web App Developer โ MVP to scale, 10+ years
โ Lead Frontend Engineer / Senior Full Stack Engineer โ led 18+ projects
๐ฅ INDUSTRIES I SERVE
โ๏ธ LegalTech founders โ 6+ Case Management Systems, Document Workflows, Client Portals, Compliance SaaS
๐ฅ Healthcare & MedTech โ 8+ Patient Platforms, Telehealth, HIPAA-Compliant data, Clinic Management SaaS
๐ฆ Logistics & supply chain โ 5+ Logistics Platforms, real-time tracking (sea/air/truck), Project44, INTTRA, EDI
๐ Marketplace & e-commerce โ 15+ Multi-Vendor Marketplaces, B2B & Two-Sided Marketplace, Stripe, bidding, complex search
๐ค AI startups โ 12+ AI-Powered products: OpenAI / Claude API / LLM, RAG Chatbots, AI Agent Platforms, vector DBs, FastAPI, browser extensions
๐ No-code & enterprise SaaS โ 10+ Form Builders, Admin Dashboards, Internal Tools, Microservices, Multi-tenant
๐ Media, AdTech & publishing โ 6+ Publisher Platforms, CMS, payment gateways, Analytics Dashboards
๐ Real estate & PropTech โ Property Listings, Bidding & Auction systems, Agent Dashboards
๐ฐ FinTech founders โ Stripe Connect, subscription billing, multi-currency, KYC, Fintech MVP
๐ EdTech โ course delivery, student dashboards, progress tracking, live sessions
๐ฅ RESULTS I DELIVER
โ MVP โ production in 2โ6 weeks, 35% fewer bugs, 5โ8 weeks shorter delivery cycle
โ Frontend: LCP under 1.5s, Lighthouse 90+, bundle size cut 40%, 18โ27% engagement uplift
โ Backend: 1M+ API requests/month, 99.9% uptime, 40โ60% lower latency
โ Database: 3โ5x faster response, 70% less DB load; 90% faster workflows, 65% fewer back-office actions
โ +30% conversion on React / Next.js apps; 15โ22% better marketplace lead quality
โ 15,000+ shipment operations/month, 2,400+ completed orders, 30,000+ healthcare users
โ 20+ SaaS MVPs launched, 47% fewer bugs after legacy modernization
๐ฅ HOW I WORK
I think like a product engineer, not a code-monkey. Before writing a line, I align on the business outcome โ who the user is, what they pay for, where the product needs to be in 6 months. Then I ship in weekly demos and stay available on Slack / Telegram for fast turnaround.
Typical cycle:
1๏ธโฃ Discovery & scoping (2โ3 days) โ define MVP boundary
2๏ธโฃ Architecture โ clean foundations, scalable schema, right stack
3๏ธโฃ Weekly sprints with demos โ steady progress every week
4๏ธโฃ Production launch โ CI/CD, monitoring, error tracking
5๏ธโฃ Post-launch support โ most clients keep me on
๐ฅ TECH STACK
Frontend: React.js, ReactJS, React Hooks, Next.js, NextJS, Vue.js, Nuxt.js, TypeScript, Redux, Zustand, Tailwind CSS, shadcn/ui
Backend: Node.js, NodeJS, Express.js, NestJS, Python, FastAPI, REST, GraphQL, WebSockets
Database: PostgreSQL, Supabase, MongoDB, MySQL, Redis, Prisma
Supabase: Auth, Row-Level Security, Edge Functions, Realtime, Storage
AWS: Lambda, S3, RDS, EC2, CloudFront, API Gateway, SQS, SNS, Cognito, ECS
Other cloud: Firebase, Vercel, Netlify, Cloudflare
AI / ML: OpenAI API, Claude API, LangChain, RAG, RAG Chatbot, AI Agent, Computer Vision
Payments: Stripe Subscriptions, Stripe Connect, Stripe Checkout, Stripe Billing, PayPal
Integrations: Twilio, SendGrid, Resend, Slack API, Telegram Bot API, EDI, Project44
Mobile: React Native, React Native Expo, iOS / Android
๐ Building a SaaS, MVP, marketplace, or AI-powered product? Click "Invite" or "Hire" and send the brief.
Node.js
JavaScript
jQuery
MongoDB
HTML
React
CSS
HTML5
Bootstrap
CSS 3
Vue.js
Nuxt.js
Front-End Development
Next.js
Redux
TypeScript
React Native
React Bootstrap
Python
Software Development
Eugene T.
Kyiv, Ukraine
$40/hr
5.0
28 jobs
Senior Full-Stack Engineer with 19+ years, 750K+ users, $30M+ processed for 1,800+ organizations
๐ซต ๐ช๐๐๐ง ๐ฌ๐ข๐จ ๐๐๐ง
โ๏ธ As a full stack developer React Node I ship SaaS platforms used by 750K+ users.
โ๏ธ As a React developer I build dashboards, analytics, and React frontends serving 130K+ signups, raising activation by 25%.
โ๏ธ As a front end developer I architect component systems across 1,800+ organizations, lifting engagement 18โ27%.
๐ฅ ๐๐๐๐๐๐ฉ๐๐ ๐๐ก๐ง๐ฆ
โ๏ธ 19+ years and 100+ projects as a full stack developer React Node across SaaS Platform, MVP, and Event Management delivery.
โ๏ธ 750K+ users and 1,800+ organizations in production, with 1.5M+ interactions and $30M+ processed as a React developer and front end developer.
โ๏ธ 130K+ signups delivered as a React developer building auth, dashboards, and payments, raising signup completion by 35%.
โ๏ธ 10+ years shipping multi-tenant products as a SaaS developer and full stack developer React Node.
๐ ๐ช๐๐๐ฅ๐ ๐ ๐๐๐๐๐ฉ๐๐ฅ
โ๏ธ As a full stack developer React Node I built NFL FLAG Youth Sports, an Event Management Platform serving 750K+ participants with registration, ticketing, scheduling, and analytics, cutting registration time by 45%.
โ๏ธ As a React developer I built University Athlete Recruitment, a multi-tenant SaaS matching 130K+ athletes with matching algorithms, RBAC, reaching 92% match accuracy.
โ๏ธ As a front end developer I built SportWrench, an Event Management Platform with scheduling, ticketing, and updates at 100% performance compliance, handling 50K+ concurrent users.
โ๏ธ As a full stack developer React Node I architect SaaS, Stripe Connect split payments, and real-time analytics, onboarding tenants 60% faster.
โ๏ธ As a React developer I build trade show software, conference management, and booth booking with Stripe Connect across 1,800+ organizations, processing $30M+.
โ๏ธ As a React developer I build high-load check-in handling 1,000+ QR badge scans per hour, cutting check-in queues by 70%.
โ๏ธ As a front end developer I build SSR/SSG frontends in Next.js, improving load speed by 50%.
โ๏ธ As a front end developer I build engagement tools, lifting member engagement by 40%.
โ๏ธ As a React developer and MERN stack developer, MERN developer, and full stack MERN engineer, I deliver SaaS development on MERN and MERN stack architecture, shipping MVPs in 4โ6 weeks.
โ๏ธ As a Full-Stack Developer, Full Stack Developer, fullstack developer, fullstack web developer, and Full-stack dev, I deliver Association Management Software (AMS) with member portals, dues management, CE credits, and certification workflows, automating 80% of admin work.
โ๏ธ As a React web developer, React js developer, full stack React developer, and full stack developer React, I build SSR/SSG platforms, cutting checkout drop-off by 30%.
โ๏ธ As a front end developer React, front end web developer, Front End Web Developer, Front End Website Developer, front end engineer, and front end designer, I deliver UI development, dashboards, and responsive UI, with 99.9% UI uptime.
โ๏ธ As a Shopify front end developer, front end developer Next.js, angular front end, front end angular developer, and front end developer vue, I build storefronts, Next.js frontends, and Angular and Vue migrations, improving conversion 15โ22%.
โ๏ธ As a React Native developer, React Native mobile app developer, and mobile app developer, I build React Native mobile apps for booking, notifications, and payments, with 12โ19% better repeat usage.
โ๏ธ As a Python developer and Python full stack developer, I build Django backends and automation across distributed teams, including React developers Ethiopia setups, cutting delivery risk by 28%.
โ๏ธ As a SaaS developer and web developer, I deliver react developer firebase integrations, Wordpress full stack builds, full stack developer PHP and full stack developer Laravel work, and WordPress developer customizations, with 99%+ delivery consistency.
โ๏ธ Hired as a Senior Full-Stack Developer, Senior Full Stack Engineer, Senior Full-Stack Software Engineer, Senior React Developer, Senior Backend Engineer, Backend Developer, Integration Engineer, Full-Stack Engineer, Frontend Developer, Front-End Developer, and Front end Developer across 6โ18 month engagements.
โ๏ธ ๐๐ข๐ช ๐ ๐๐จ๐๐๐
โ๏ธ Frontend: React, react js, Java React, frontend React, TypeScript, Redux, JavaScript, HTML, HTML5, CSS, CSS3, Bootstrap, React Bootstrap, jQuery, and Responsive Design, with deep front end development and Front-End Development practice.
โ๏ธ Backend: Node.js, backend nodejs, PHP, Python, SQL, MongoDB, and PostgreSQL, delivered as a Node.js developer and Backend Developer.
โ๏ธ Frameworks & CMS: Next.js, NestJS, Vue.js, Angular, Laravel, .NET full stack, WordPress, Shopify, and Webflow.
โ๏ธ Practice: Software Architecture & Design, Software Development, Agile Software Development, Software Design, Software Debugging, Git, Web Design, and Desktop Application work with a UX designer mindset.
Node.js
JavaScript
jQuery
HTML
PHP
React
WordPress
Bootstrap
HTML5
CSS
CSS 3
Web Design
Vue.js
Angular
SQL
Python
Git
Desktop Application
Software Design
Agile Software Development
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