Senior Frontend Engineer with 14+ years building production-grade web applications for FinTech, E-commerce, and SaaS. I combine deep React/Next.js/TypeScript expertise with a proven AI-assisted workflow - delivering work up to 15% faster without sacrificing quality, and cutting load times by 40%+ through clean architecture.
Here's what you get:
React/Next.js Developer - 14+ years of production experience across FinTech, E-commerce, and SaaS. At Zoral Labs (5 years), I architected a client-facing financial analytics dashboard processing complex banking data. At PrivatBank (20M+ clients), I built customer-facing UIs at scale.
AI-Powered Engineer - I don't just use AI tools - I standardized them. At Zoral Labs, I introduced GitHub Copilot across the team, achieving a ~15% productivity increase during feature sprints. AI-assisted code generation, debugging, and documentation with OpenAI Codex, Claude, and many other free models - built into my workflow, not bolted on.
Frontend Architect - I design component systems that cut development time and reduce bugs. At RMG Media, I built a reusable TypeScript component library adopted across three major projects. At Zoral Labs, I refactored legacy state management to React Context across 10+ components, eliminating state-related regression bugs.
Performance Specialist - I optimize what users feel. Redesigned GraphQL schemas to reduce data-intensive dashboard load times by 40%+. Built a headless React frontend for Magento 2 that improved Core Web Vitals scores by 50%+.
Testing Specialist - I ship with confidence: Jest, Vitest, React Testing Library, Cypress, Playwright, and Storybook integrated from day one. Zero-to-coverage testing setup for teams that need reliability, not guesswork.
I specialize in:
• React + Next.js + TypeScript - 14+ years, my core stack, not a side skill
• Redux Toolkit + TanStack Query + XState - state management that scales (XState checkout flows cut support tickets by 20%+)
• GraphQL + REST API + WebSockets - from simple REST calls to real-time WebSockets
• Tailwind CSS + Micro-Frontends - design systems and architecture that last
• Full-cycle testing - unit, integration, E2E from day one
• AI-assisted development - GitHub Copilot, OpenAI Codex, Claude, OpenClaw, Hermes (~15% productivity boost on feature sprints)
What I don't do:
• I don't write untested code and call it "done"
• I don't copy-paste from Stack Overflow into production
• I don't disappear after the first milestone
I'm not the cheapest developer on Upwork. But if you want frontend that doesn't break, code your team understands, and delivery dates that hold - we should talk.
14+ years. Millions of users. AI-powered delivery.
Let's discuss your project. The first 30-minute consultation is free.
JavaScript
React
Next.js
TypeScript
Node.js
Redux
Tailwind CSS
HTML5
CSS 3
Responsive Design
Web Design
Front-End Development
Full-Stack Development
API Integration
REST API
PostgreSQL
MongoDB
Supabase
GraphQL
Stripe
Illia K.
Dnipro, Ukraine
$34/hr
5.0
14 jobs
I have been a successful web developer for 10 years.
I`ve worked on the local market for 8 years. Now I want to cooperate with the Western market. I am interested in big projects and focused on long-term cooperation.
I am open for communication and ready to implement projects that will bring high profit
When I undertake project or task, I don't just complete it, I go the extra mile and make it better than requested.
I have great expertise:
- Web Development technologies:
PHP: Laravel, Yii2, Symfony
CMS: WordPress, PrestaShop
HTML / CSS: HTML5/CSS3, Bootstrap.
JavaScript: Vue js, jQuery, React, AngularJS, BackboneJS, NodeJS, three.js, GreenSock, etc.
Database: MySQL, PostgreSQL, MongoDB
Web Servers: Nginx, Apache
My main specialization are e-commerce projects, front-end development (js, vue/nuxt, react).
I will work with you to create your dream, solve your problem, or simply get the project done in a timely manner.
Feel free to contact me and we will create a great project together!
JavaScript
HTML
HTML5
PHP
CSS 3
Sketch
MySQL
Web Design
User Interface Design
WordPress Development
Laravel
Websockets
Elasticsearch
Vue.js
Animation
Roman B.
Dnipro, Ukraine
$47/hr
5.0
28 jobs
𝟭𝟭+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗺𝗲𝗲𝘁𝘀 𝗺𝗼𝗱𝗲𝗿𝗻 𝗔𝗜 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝗰𝘆.
• 𝗢𝗹𝗱-𝘀𝗰𝗵𝗼𝗼𝗹 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝘀𝘁𝗮𝗻𝗱𝗮𝗿𝗱𝘀
• 𝗦𝗽𝗲𝗰-𝗱𝗿𝗶𝘃𝗲𝗻 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝘃𝗶𝗮 𝗔𝗜 𝗮𝗴𝗲𝗻𝘁𝘀
I leverage advanced AI assistants (Cursor, Claude) to build production-ready software faster, without compromising on architectural integrity.
𝗖𝗢𝗥𝗘 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘
I build SaaS products, modernize legacy systems, and deliver production web applications using 𝗡𝗼𝗱𝗲.𝗷𝘀, 𝗡𝗲𝘀𝘁𝗝𝗦, 𝗥𝗲𝗮𝗰𝘁, 𝗡𝗲𝘅𝘁.𝗷𝘀, 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁, 𝗮𝗻𝗱 𝗔𝗪𝗦.
Most of my work is not just building isolated features. I take products from idea to production, clean up hard-to-maintain logic, improve architecture, and ensure the system is practical to operate and scale long-term.
𝗪𝗛𝗔𝗧 𝗜 𝗗𝗢
• 𝗪𝗲𝗯 𝗔𝗽𝗽𝘀 & 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀: Custom SaaS, admin panels, dashboards, CMS, and workflow-heavy applications.
• 𝗥𝗲𝗮𝗹-𝗧𝗶𝗺𝗲 𝗦𝘆𝘀𝘁𝗲𝗺𝘀: Fast updates, socket events, and event-driven behavior.
• 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: LLM features, RAG pipelines, advanced retrieval/embedding strategies, and multi-agent workflows.
𝗣𝗥𝗢𝗩𝗘𝗡 𝗧𝗥𝗔𝗖𝗞 𝗥𝗘𝗖𝗢𝗥𝗗
• 𝗢𝗸𝘁𝗼𝗴𝗼𝗻 𝗠𝗲𝗱𝗶𝗮: Designed and delivered a custom CMS for multi-site content management (React, Next.js, Node.js, NestJS, Docker, K8s, AWS). Built ETL processes to migrate production data from a commercial CMS. Result: The public frontend became 𝟰𝘅 𝗳𝗮𝘀𝘁𝗲𝗿 (meeting strict Lighthouse criteria), making content operations highly efficient.
• 𝗕𝗿𝗶𝘂𝘁𝗮 𝗠𝗲𝗱𝗶𝗰𝗮𝗹 𝗖𝗲𝗻𝘁𝗲𝗿: Built a real-time queue management product from scratch (React, PostgreSQL, Node.js) featuring priority-based event logic and socket updates.
𝗪𝗛𝗬 𝗪𝗢𝗥𝗞 𝗪𝗜𝗧𝗛 𝗠𝗘?
I bring a product-oriented mindset, transparent communication, and practical decision-making. I think like a product owner, not just an implementer. This allows me to spot risks early, suggest structural improvements, and keep development strictly aligned with your business goals.
While my core focus spans 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲, 𝗘𝗱𝗧𝗲𝗰𝗵, 𝗦𝗮𝗮𝗦, 𝗮𝗻𝗱 𝗠𝗲𝗱𝗶𝗮/𝗖𝗼𝗻𝘁𝗲𝗻𝘁 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀, I am always open to driving impact in any strong product domain.
𝗜𝗳 𝘆𝗼𝘂 𝗻𝗲𝗲𝗱 𝗮 𝘀𝗲𝗻𝗶𝗼𝗿 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿 𝘄𝗵𝗼 𝗰𝗮𝗻 𝗯𝘂𝗶𝗹𝗱, 𝗺𝗼𝗱𝗲𝗿𝗻𝗶𝘇𝗲, 𝗮𝗻𝗱 𝗺𝗼𝘃𝗲 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗱𝘂𝗰𝘁 𝗶𝗻 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝗱𝗶𝗿𝗲𝗰𝘁𝗶𝗼𝗻, 𝗹𝗲𝘁’𝘀 𝘁𝗮𝗹𝗸! 𝗖𝗹𝗶𝗰𝗸 "𝗠𝗲𝘀𝘀𝗮𝗴𝗲" 𝗼𝗿 "𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯" 𝘁𝗼 𝗴𝗲𝘁 𝘀𝘁𝗮𝗿𝘁𝗲𝗱.
KEYWORDS / TECH STACK FOR SEARCH: Full Stack Engineer, Senior Developer, Node.js, NestJS, React, Next.js, TypeScript, AWS, Amazon Web Services, Docker, Kubernetes, K8s, PostgreSQL, MongoDB, MySQL, SaaS development, AI integration, LLM, RAG pipelines, AI agents, Open AI, Codex, Cursor, Claude, agent development, real-time applications, WebSockets, socket io, CMS modernization, legacy system upgrade, ETL data migration.
JavaScript
MongoDB
Node.js
Next.js
PostgreSQL
React
ExpressJS
TypeScript
Web Development
NestJS
Full-Stack Development
REST API
Software Development
API Integration
SaaS
SaaS Development
API
HTML
CSS
Web Application
Roman K.
Dnipro, Ukraine
$30/hr
5.0
8 jobs
Full Stack Engineer with a strong focus on TypeScript, Node.js, Python and modern frontend frameworks like React and Angular. Since 2017, I’ve contributed to both commercial and open-source projects, designing scalable architectures, building developer-friendly tools, and mentoring junior engineers. I specialize in modular system design, and AI agents integration for interactive applications. Proven ability to deliver maintainable solutions across the full software lifecycle in remote, cross-functional teams.
JavaScript
TypeScript
React
Angular
CSS
HTML5
Git
Responsive Design
Angular Material
Front-End Development
Node.js
ExpressJS
Python
Flask
Serhii P.
Dnipro, Ukraine
$25/hr
5.0
3 jobs
I'm a developer who has experience in writing integrations with other services using the REST API (trello, intercom, groove, poster pos). Have experience in setting up webhooks. Writing procedures in Oracle and SQL Server
● I always finish my work
● Always stay in touch and happy to discuss the details
● Have experience with HTML, CSS, JS
● Node,js,, Sequelize, PDFKit
● MySql, Postresql, SQL Server, Oracle
● GitLab, GitHub, Github pages, jekyll.
● Little experience with React js, Angular, Nest.js, TypeScript.
● Firebase, Trello, Google Cloud, Intercom API, Groove API.
JavaScript
Node.js
PostgreSQL
CSS
Microsoft SQL Server
HTML
Google Cloud Platform
ECMAScript 6
Oracle
Sequelize
Intercom
API
Trello
Firebase
Andrii T.
Dnipro, Ukraine
$35/hr
4.8
21 jobs
𝙋𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚 𝙞𝙨𝙨𝙪𝙚𝙨, 𝙢𝙚𝙨𝙨𝙮 𝙨𝙩𝙖𝙩𝙚 𝙢𝙖𝙣𝙖𝙜𝙚𝙢𝙚𝙣𝙩, 𝙤𝙧 𝙘𝙤𝙙𝙚 𝙩𝙝𝙖𝙩’𝙨 𝙝𝙖𝙧𝙙 𝙩𝙤 𝙚𝙭𝙩𝙚𝙣𝙙 — 𝙘𝙤𝙢𝙢𝙤𝙣 𝙘𝙝𝙖𝙡𝙡𝙚𝙣𝙜𝙚𝙨 𝙞𝙣 𝙜𝙧𝙤𝙬𝙞𝙣𝙜 𝘼𝙣𝙜𝙪𝙡𝙖𝙧 𝙖𝙥𝙥𝙨. I am Senior Angular Developer with 9+ years of experience across MVPs, SaaS products, and enterprise systems. I work with existing codebases and new builds, focusing on structure, performance, and clean architecture. Core Stack: Angular (v2+), TypeScript, RxJS, NgRx, Node.js 🤩
𝙒𝙝𝙖𝙩 𝙄 𝙖𝙘𝙩𝙪𝙖𝙡𝙡𝙮 𝙙𝙚𝙡𝙞𝙫𝙚𝙧 ✉️
Scalable SaaS platforms & MVP development
High-performance Angular front-end architecture
Complex data-driven dashboards & real-time systems
Full-stack applications with Node.js / REST / GraphQL
Clean, maintainable code with low technical debt
Fast, responsive UI with excellent UX & performance
𝘾𝙤𝙧𝙚 𝙀𝙭𝙥𝙚𝙧𝙩𝙞𝙨𝙚 🏆
Front-End / Angular
Angular (2–21), TypeScript (strict), JavaScript (ES2025),
Standalone Components, Angular Signals, RxJS, NgRx (Store, Effects, Component Store, Signal Store),
Zoneless Angular, SSR (Angular Universal), Hydration
𝙁𝙪𝙡𝙡-𝙎𝙩𝙖𝙘𝙠 𝙖𝙣𝙙 𝘽𝙖𝙘𝙠𝙚𝙣𝙙 𝘾𝙤𝙡𝙡𝙖𝙗𝙤𝙧𝙖𝙩𝙞𝙤𝙣
Node.js, Express, NestJS
REST API development, GraphQL (Apollo)
Authentication, RBAC, API design
𝘼𝙧𝙘𝙝𝙞𝙩𝙚𝙘𝙩𝙪𝙧𝙚 𝙖𝙣𝙙 𝙋𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚
Scalable architecture design
Lazy loading, code splitting
Performance optimization & profiling
Memory optimization
High-load systems & real-time apps
𝙐𝙄 / 𝙐𝙓 / 𝘿𝙚𝙨𝙞𝙜𝙣 𝙎𝙮𝙨𝙩𝙚𝙢𝙨
HTML5, SCSS, CSS Grid, Flexbox
Angular Material, CDK
Custom design systems
Responsive & adaptive layouts
𝙍𝙚𝙖𝙡-𝙏𝙞𝙢𝙚 & 𝘿𝙖𝙩𝙖 𝙎𝙮𝙨𝙩𝙚𝙢𝙨
WebSockets, streaming data
Data visualization dashboards
Complex state management (NgRx + RxJS)
𝙏𝙚𝙨𝙩𝙞𝙣𝙜 & 𝙌𝙪𝙖𝙡𝙞𝙩𝙮
Jest, Cypress, Jasmine, Karma, Vitest
Unit, Integration, E2E testing (Playwright)
Code review, refactoring, tech debt reduction
𝙏𝙤𝙤𝙡𝙨 & 𝙒𝙤𝙧𝙠𝙛𝙡𝙤𝙬
Nx monorepos, Vite
GitHub, GitLab, Bitbucket
Jira, Sentry, Cloudflare, Google Analytics
Experience Highlights
𝙄’𝙫𝙚 𝙬𝙤𝙧𝙠𝙚𝙙 𝙤𝙣 👔
SaaS platforms for logistics, compliance, and analytics
Enterprise systems with complex workflows and high data volume
Real-time trading platforms with WebSocket streaming and high-frequency UI updates
CRM systems and productivity tools with large-scale data manipulation
✔️ Defining front-end architecture
✔️ Stabilizing large codebases
✔️ Improving performance and load time
✔️ Reducing technical debt
✔️ Mentoring developers and setting engineering standards
𝙃𝙤𝙬 𝙄 𝙖𝙥𝙥𝙧𝙤𝙖𝙘𝙝 𝙥𝙧𝙤𝙟𝙚𝙘𝙩𝙨 🔧
I don’t just “build features”, I:
Analyze product and business requirements
Design scalable architecture from the start
Prevent future bottlenecks and tech debt
Ensure smooth collaboration with backend & product teams
Deliver predictable, maintainable, production-ready systems
Let’s talk 💬
If you’re building a SaaS product, MVP, or scaling an existing platform, I can help you design and deliver a solution that will not break as your product grows 💪
Keywords 🐯
Angular Developer, Senior Angular Engineer, Angular Front-End Developer, Full Stack Developer, JavaScript Developer, TypeScript Developer, Front-End Engineer, Software Engineer, Angular (v2+), Angular CLI, Angular Universal, Angular Signals, Standalone Components, RxJS, NgRx, State Management, Reactive Programming, HTML5, CSS3, SCSS, Tailwind CSS, CSS Grid, Flexbox, Responsive Design, Pixel-Perfect UI, Cross-Browser Compatibility, UI Development, UX Optimization, SPA, PWA, SSR, Hydration, Web Performance, Node.js, NestJS, Express.js, REST API, GraphQL, API Integration, Microservices, Authentication, JWT, OAuth 2.0, WebSockets, Real-Time Applications, PostgreSQL, MongoDB, Firebase, Performance Optimization, Lazy Loading, Code Splitting, High Load Systems, Scalable Architecture, SaaS Development, MVP Development, Enterprise Applications, Data Visualization, Dashboards, Testing, Jest, Cypress, Vitest, CI/CD, Docker, AWS, Git, Agile, Refactoring, Clean Code, Scalable Systems
JavaScript
TypeScript
Website
Angular Material
RxJS
Material UI
Startup Company
Angular
Front-End Development
Clean Architecture
Dashboard
NestJS
Node.js
Reactive Programming
Responsive Design
Unit Testing
Microservice
Full-Stack Development
SQL
Database
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