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❗𝐁𝐄𝐅𝐎𝐑𝐄 𝐁𝐔𝐘𝐈𝐍𝐆 𝐓𝐇𝐈𝐒 𝐏𝐑𝐎𝐉𝐄𝐂𝐓, please send your demands to me through Upwork Direct by visiting my Upwork profile so I can return with a positive reply!
We provide consultation on selecting the most suitable technology stack and defining the optimal system architecture. Our goal is to ensure scalability, performance, and long-term maintainability.
Python developer python full stack developer Python developer Python developer aws Python developer Python developer Python developer Python developer Python developer Python developer Python developer Python ai developer Python developer Python developer Python developer Python developer python full stack developer flask Python ai developer python developer php developer full stack developer web scaping web developer python developer
We provide consultation on selecting the most suitable technology stack and defining the optimal system architecture. Our goal is to ensure scalability, performance, and long-term maintainability.
Python developer python full stack developer Python developer Python developer aws Python developer Python developer Python developer Python developer Python developer Python developer Python developer Python ai developer Python developer Python developer Python developer Python developer python full stack developer flask Python ai developer python developer php developer full stack developer web scaping web developer python developer
Programming Languages
HTML & CSS, JavaScript, PythonCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$40
|
Standard
$800
|
Advanced
$3,200
|
|---|---|---|---|
| Delivery Time | 1 day | 5 days | 10 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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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.
SC
Stephanie C.
Mar 27, 2026
30 minute consultation
JD
John D.
Feb 16, 2026
Frontend project for pro-democracy non-profit (React/Next/Tailwind)
Alex is the best frontend developer I've found on Upwork. He is very efficient, honest, and technically adept. He went beyond just completing requirements to make the product better in so many ways. He was not just a great contractor, but a partner in delivering a high-quality project.
OY
Omar Y.
Feb 13, 2026
Multi-Country Events E-commerce Platform
Building munaseb from idea to live product required a team that could understand both the technical and business side — and we found that in "This is software" tech team.
From early discussions to launch, they worked closely with us to translate our vision into a functional, scalable platform. Like any growing product, there were iterations and adjustments along the way, but they remained responsive, solution-driven, and committed to getting things right.
From early discussions to launch, they worked closely with us to translate our vision into a functional, scalable platform. Like any growing product, there were iterations and adjustments along the way, but they remained responsive, solution-driven, and committed to getting things right.
GD
Guillaume D.
Nov 14, 2025
30 minute consultation
About Alexander
React Developer | Full Stack Developer React Node & Frontend Next.js
100%
Job Success
Kyiv, Ukraine - 3:49 pm 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