You will get React Developer | Frontend React Developer | React Web Developer
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Top Rated
Project details
You'll get a senior React specialist for the work most developers quietly avoid - complex state, performance bottlenecks, and app architecture that stays sane past ten screens. I don't just assemble components; I build React apps that stay fast and maintainable as they grow.
New React app, one that's slowing down, or a codebase where re-renders and tangled state got out of hand. You get engineering judgment, not just hands. I work across the modern React ecosystem (hooks, state, data fetching, Next.js) and pick the right tool for your case instead of forcing a pattern.
Why Work With Me?
• Senior depth: I solve the hard React problems, not just the visible ones.
• Performance-minded: fast load, smooth interactions, no re-render chaos.
• Maintainable by design: clean architecture your team can build on without fear.
React Developer Senior React Developer Frontend React Developer React Web Developer React JS Developer Expert React Developer React Developer Senior React Developer React Web Developer Frontend React Developer React Developer React JS Developer React Web Developer React Developer Senior React Developer React Developer React Developer Senior React Developer Frontend
New React app, one that's slowing down, or a codebase where re-renders and tangled state got out of hand. You get engineering judgment, not just hands. I work across the modern React ecosystem (hooks, state, data fetching, Next.js) and pick the right tool for your case instead of forcing a pattern.
Why Work With Me?
• Senior depth: I solve the hard React problems, not just the visible ones.
• Performance-minded: fast load, smooth interactions, no re-render chaos.
• Maintainable by design: clean architecture your team can build on without fear.
React Developer Senior React Developer Frontend React Developer React Web Developer React JS Developer Expert React Developer React Developer Senior React Developer React Web Developer Frontend React Developer React Developer React JS Developer React Web Developer React Developer Senior React Developer React Developer React Developer Senior React Developer Frontend
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Localization, SecurityWhat's included
| Service Tiers |
Starter
$40
|
Standard
$3,200
|
Advanced
$5,200
|
|---|---|---|---|
| Delivery Time | 1 day | 10 days | 30 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
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Ollie K.
Aug 12, 2026
Full-stack developer needed to migrate React/Supabase web app to own hosting (Cloudflare + Supabase)
Working with Alexander was exactly what I needed. Not only did he complete the work I needed perfectly, he talked me through his processes and also went out of his way to find workarounds and tweaks to benefit my project.
Really impressed. Would recommend highly.
Really impressed. Would recommend highly.
DG
Dmitry G.
Aug 5, 2026
React Developer | Full Stack Developer React Node | Nextjs Developer for technical audit
Great job reviewing our React and Node.js SaaS application. Out app was carefully analysed, its codebase, architecture, integrations, billing system, database, and front end. As a result was provided a clear report with crucial findings and recommendations. The communication was super smooth.
I highly recommend for any type of work related to React, Nextjs, or SaaS development work.
I highly recommend for any type of work related to React, Nextjs, or SaaS development work.
WM
Warren M.
Jul 31, 2026
Fixed-Price Engagement: Stabilise and Fix Live SaaS System
Loved working with Alex. He is a very good operator and is very knowledgeable, skilled dev. Completed the job exactly how I wanted it and was really thorough in everything he did. Fixed my problems and gave be back the software I asked for.
SM
Scott M.
Jun 30, 2026
Next.js Developer with Tailwind CSS and PostgreSQL Experience
Alexander was super great to work with! He was able to switch between several projects and understand both the business requirements and technical implications needed to move the project forward. I would hire Alexander again!
JD
John D.
May 22, 2026
NextJS (React / Tailwind) for advocacy platform
Alex is a extremely efficient and productive, but he also uses best practices and thinks carefully about architecture, so the solutions he delivers are well-designed. He uses AI to boost productivity, but doesn't blindly rely on it either. I've worked with many developers on Upwork and he is definitely in the very top tier.
About Alexander
React Developer | Full Stack Developer React Node.js | Supabase expert
100%
Job Success
Kyiv, Ukraine - 12:25 am local time
🏆 10+ years of experience
🔥 60+ successfully delivered projects
💸 products generating $8,5M+ in revenue
⭐ Web app with 20,000+ active users
I'm a Full Stack React Developer with 10+ years of production experience, delivering 60+ projects across SaaS, marketplaces, logistics, e-commerce, and Ops, with systems supporting 20K+ active users, 99.9% uptime, and millions of monthly requests. As a Senior React Developer and Frontend React, I shipped 50+ commercial products as a Full Stack Developer React Node, helping clients reach $8,2M+ revenue and reduce time-to-market by 30–40%.
I work daily as a Full Stack React Developer and Frontend React Next.js developer, combining UI performance and backend architecture as a Full Stack Developer React Node and Frontend React developer, improving LCP/TTI by 2–3x, increasing conversion rates by 25–35%, and scaling apps to 100K+ MAU. My background as a Frontend React developer and Full Stack Developer React Node enables full ownership from UX design to scaling and post-launch optimisation.
As a Full Stack React Developer, I’ve built SaaS platforms using Supabase and Supabase Postgres, implementing auth, RLS, and real-time systems handling 100K–300K events/day. I’ve used Supabase in 9+ production apps with Postgres, react next.js, react js, cutting backend costs by 40%, infra overhead by 35%, and delivery time by 30%.
I'm a Full Stack Developer React Node with deep experience as a full stack developer Node.js developer , building APIs, real-time services, and dashboards processing 5M+ requests/month. As a Full Stack Developer React Node, I delivered CRM, logistics, and warehouse dashboards, plus B2C marketplaces with Stripe payments, automating 50–70% of manual workflows.
On the frontend, I’ve worked the last 8+ years as Frontend React js and front end developer react. As frontend developer react, frontend react developer I focus on performance and conversion, reducing load times by 60%, bounce rates by 25%, and increasing engagement by 30–45%. I collaborate as a ux designer to turn UI improvements into measurable revenue growth.
I am also a react native developer, shipping 5+ cross-platform apps for iOS and Android, supporting 50K+ active users, 99.8% uptime, and peak loads during live events. These apps powered logistics and energy-tech startups reaching £7M annual revenue. I’ve also delivered projects using Astro, Svelte, Python.
As a web developer, full stack developer, and full stack react developer, I’ve built MERN stack systems as full stack developer react node, react redux, java react, and scalable APIs, deployed across multiple regions. I collaborated with distributed teams, including react developers Filipinos, reducing release cycles by 25% and production bugs by 30%.
Payments and monetization are core strengths: I implemented stripe billing, subscriptions, and marketplaces generating $4,7M+ revenue as a frontend react developer, reducing checkout drop-off by 20–30% and increasing AOV by 15–25%. I build SEO-friendly SSR apps with react next.js and next.js firebase, achieving 90+ Lighthouse scores and 2–3x organic traffic growth using modern javascript optimizations as a Full Stack Developer React Node.
Recent work includes large-scale dashboards, marketplaces, and PWAs built as a Full Stack React Developer, Frontend React, and Full Stack Developer React Node, using Claude Code for fast launches and custom React systems for core logic, saving teams 300–500 hours/month. My focus is always on clean architecture, measurable impact, and long-term maintainability.
If you’re looking for a Full Stack React Developer, react js developer, react web developer, or node developer who delivers measurable results, I provide predictable delivery, business-focused decisions, and long-term ownership.
🛠 Additional Technical expertise
- Launched 4+ apps as a mobile app developer / front end developer html, reaching 50K+ installs and 4.9 avg rating.
- Deep experience with Supabase RLS policy and Supabase Auth across 7+ systems and 20+ roles.
- Experience as a Python developer and senior full stack developer react node with Supabase on data-heavy platforms.
- 30+ projects as full stack developer react node.
- Full Stack Development work and 1200+ hours as full stack developer react node
- LLM & AI integration, OpenAI, Gemini, Chat GPT, building AI-powered applications that reduced manual work by 30–50% as a frontend react next.js developer and node full stack developer
- 8+ years as react js next js and 5+ years as react nextjs developer
- 6+ years as a frontend next.js react developer
- 5+ years as node.js developer, and backend nodejs engineer
- 10 projects as a headless CMS front end developer and as front end developer angular.
Let's begin the collaboration with Full stack React Developer by clicking "Invite" or "Hire" on the top right
Steps for completing your project
After purchasing the project, send requirements so Alexander can start the project.
Delivery time starts when Alexander receives requirements from you.
Alexander works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery call
Onboarding