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Ilya Yarmak
Verified Expert in Engineering
Full-stack Developer
Poznań, Poland
Toptal member since April 17, 2025
Bio
Ilya is a senior full-stack engineer with 6+ years of experience, specializing in front-end development, design engineering, and AI-powered applications. He combines technical expertise with strong design and product judgment to build polished, intuitive user experiences at speed. Experienced in LLM integrations, conversational agents, and real-time applications, he takes products from early prototypes to production with technical depth and attention to detail.
Portfolio
Eden Studio
Codex, Cursor AI, Claude Design, React, React Query, Figma to React, TypeScript...
JusticeBid
Cursor AI, Claude, Claude Code, React, React Query, Python, FastAPI, PostgreSQL...
Roley AI
React, Next.js, Tailwind CSS, Shadcn, Firebase, Supabase, Node.js, TypeScript...
Experience
- User Experience (UX) - 6 years
- Front-end Development - 6 years
- TypeScript - 6 years
- React - 6 years
- Next.js - 5 years
- Agentic Coding - 3 years
- LLM Agents - 2 years
- Product Engineering - 2 years
Work Experience
Senior Front-end / Design Product Engineer
2025 - PRESENT
Eden Studio
- Owned front-end engineering and UX decisions for new product features, taking ideas and rough prototypes through to polished, production-ready experiences.
- Architected and built React/TypeScript applications with reusable components, a shared design system, and maintainable front-end architecture.
- Shipped end-to-end product features across the front end and back end, including APIs, integrations, payments, data flows, and internal tooling.
- Identified and removed front-end performance bottlenecks, improving Core Web Vitals and significantly reducing load times in key parts of the product.
- Established project conventions and architecture that give AI coding agents stronger project context, improving the reliability and speed of AI-assisted development.
- Improved engineering quality and delivery speed by introducing stronger type safety, linting, pre-commit tooling, CI checks, and automated API/client workflows.
Technologies: Codex, Cursor AI, Claude Design, React, React Query, Figma to React, TypeScript, Python, Django, Shadcn, Shadcn UI, Tailwind CSS, Chakra UI, PostgreSQL, Agentic Coding, OpenAI API, LLM Agents, LLM Integration, Product Engineering, Code Review, Code Refactoring, Responsive Web Design (RWD), User Experience (UX), User Interface (UI), UX Design, CI/CD Pipelines, REST APIs, Web Performance Optimization (WPO), Mobile Web Design, Engineering Design
Senior Front-end / Full-stack Engineer
2025 - 2026
JusticeBid
- Owned the frontend of an AI-powered legal technology platform used by enterprise legal teams at Fortune 500 companies, including McDonald’s, Meta, Starbucks, AbbVie, and Altria, to manage complex rate review and outside counsel workflows.
- Designed and built complex React/Next.js product features with a focus on maintainable architecture, performance, and clear UX.
- Worked closely with the CPO to turn business requirements, product ideas, and user feedback into production-ready features and improvements.
- Led front-end architecture decisions, including API integration patterns, generated API clients, reusable components, and shared application conventions.
- Took ownership of back end work when needed to unblock product delivery, building and improving FastAPI APIs, fixing backend issues, and optimizing performance to support new frontend functionality.
- Improved developer experience and reliability by strengthening frontend-backend contracts, type safety, and API generation workflows.
Technologies: Cursor AI, Claude, Claude Code, React, React Query, Python, FastAPI, PostgreSQL, Tailwind CSS, Shadcn UI, Shadcn, Notion, Gemini API, OpenAI API, Product Engineering, LLM Agents, Full-stack Development, Front-end Development, Back-end Development, User Experience (UX), User Interface (UI), UX Design, Agentic Coding, SQLAlchemy, Storybook, Next.js
Senior Front-end/Full-stack Engineer
2024 - 2025
Roley AI
- Architected and owned the front end of an early-stage AI learning platform using React, Next.js, and TypeScript.
- Built AI agents and real-time voice experiences using Vapi, LiveKit, Node.js, and Supabase, directly contributing to a 30% increase in client revenue.
- Owned product-facing front-end and UI decisions, turning early ideas and AI capabilities into clear, production-ready user experiences.
- Established front-end architecture, reusable patterns, and engineering practices that improved maintainability as the product evolved.
- Built back-end APIs and supporting product functionality with Node.js, TypeScript, and Next.js to deliver features end-to-end.
- Worked directly with the founder on technical direction and engineering practices, helping shape both the product and codebase as the company grew.
Technologies: React, Next.js, Tailwind CSS, Shadcn, Firebase, Supabase, Node.js, TypeScript, JavaScript, Cursor AI, OpenAI API, Deepgram, Groq, Front-end, CSS3, HTML5, CSS, HTML, Express.js, JSON, UX Design, Claude, Full-stack Development, User Experience (UX), WebSockets, Real-time Systems, User Interface (UI), JSON API, REST APIs, React Native, Back-end Development
Senior Front-end / UX/UI Engineer
2022 - 2024
Storm Ideas
- Built and shipped front-end experiences reaching 1M+ monthly users for major entertainment brands including SiriusXM, Hallmark Channel, Disney, NBA, Warner Records, and Wizarding World.
- Rebuilt and optimized Hallmark Channel’s seasonal applications with Next.js, significantly reducing load times and eliminating recurring delivery delays, resulting in consistent on-time launches.
- Modernized SiriusXM’s blog experience with Next.js, improving design, performance, and WCAG accessibility and contributing to a 25% increase in user engagement.
- Developed responsive, cross-browser interfaces for high-traffic consumer products, with a strong focus on accessibility, performance, and reliable behavior across devices.
- Worked across multiple client products in fast-moving delivery teams, adapting quickly to different codebases, design systems, and technical constraints.
Technologies: React, Next.js, TypeScript, JavaScript, Tailwind CSS, SCSS, GraphQL, Shadcn, CI/CD Pipelines, Front-end, CSS3, HTML5, Node.js, Redux, CSS, HTML, Express.js, JSON, UX Design, Full-stack Development, User Experience (UX), WebSockets, User Interface (UI), JSON API, REST APIs
Front-end Developer
2021 - 2022
Revpanda
- Launched 15+ responsive iGaming websites by transforming Figma designs into pixel-perfect, cross-browser compatible UIs.
- Ensured fast delivery under tight deadlines in a high-paced environment while maintaining high design and code quality.
- Collaborated remotely with designers and project managers to deliver visually polished, mobile-first websites using React, TypeScript, SCSS, and Bootstrap.
Technologies: React, TypeScript, SCSS, Bootstrap, Front-end, CSS3, HTML5, CSS, HTML, JSON, UX Design, User Experience (UX), User Interface (UI), JSON API, REST APIs
Front-end Developer
2020 - 2022
Freelance
- Delivered front-end and UI/UX work for startups and growing companies across 10+ freelance clients, maintaining a 100% Job Success Score, 5.0/5 client rating, and earning the Top Rated Plus badge, representing the platform’s top 3% of performers.
- Designed and built polished React interfaces across SaaS products, real-time dashboards, complex forms, and interactive web applications.
- Worked directly with founders and product teams to turn product requirements and Figma designs into intuitive, production user experiences.
- Built responsive, cross-browser interfaces and reusable component systems with a strong focus on UI/UX quality, accessibility, and visual accuracy.
- Improved and redesigned existing product experiences, simplifying complex workflows and turning rough or incomplete designs into cohesive interfaces.
- Took ownership of front-end implementation and UI/UX decisions from initial requirements through production release.
- Consistently earned client feedback for speed, communication, attention to detail, independence, and high-quality front-end execution.
Technologies: React, TypeScript, Next.js, Tailwind CSS, SCSS, Bootstrap, Emotion, JavaScript, Front-end, CSS3, HTML5, CSS, HTML, Express.js, JSON, UX Design, Material UI, User Experience (UX), User Interface (UI), JSON API, REST APIs, Full-stack Development, Front-end Development
Project History
SiriusXM Blog
https://www.siriusxm.com/blog/A top audio entertainment provider in North America. I migrated their legacy WordPress blog to a modern, high-performance application built from scratch using Next.js, React, TypeScript, and Tailwind CSS. Also, I completely redesigned it, which significantly enhanced performance, accessibility, and user engagement across the platform.
Hallmark Channel's Seasonal Apps
A leading entertainment network, reaching millions of viewers with its beloved family-friendly programming, particularly famous for its widely popular holiday movies.
I rebuilt their seasonal apps from the ground up using Next.js, React, and Tailwind CSS, significantly improving performance, maintainability, and user experience. This overhaul reduced load times by 40% and enabled the team to consistently hit 100% of launch deadlines for the first time.
I rebuilt their seasonal apps from the ground up using Next.js, React, and Tailwind CSS, significantly improving performance, maintainability, and user experience. This overhaul reduced load times by 40% and enabled the team to consistently hit 100% of launch deadlines for the first time.
Roley AI
A sales training platform that helps solar companies train their teams using AI-powered voice agents. I led the full-stack development of the app using React, Next.js, TypeScript, Node.js, and Tailwind CSS. The platform allows sales reps to practice real-life call scenarios with AI agents acting as homeowners, upload and analyze real customer calls, and track performance through intelligent dashboards. My work directly contributed to improving training efficiency, enhancing UX, and increasing the overall effectiveness of solar sales teams.
Education
2019 - 2023
Bachelor's Degree in Computer Science
Poznan University of Technology - Poznan, Poland
Skills
Libraries/APIs
React, React Query, OpenAI API, JSON API, REST APIs, Node.js, Emotion, Twilio API, SQLAlchemy
Tools
Firebase Authentication, Git, Figma to HTML, Shadcn, Claude, Slack, Figma, Jira, Asana, Trello, Notion, Atlassian, Codex, Claude Code, Shadcn UI
Languages
TypeScript, JavaScript, SCSS, CSS3, HTML5, CSS, HTML, GraphQL, SQL, Python
Frameworks
Tailwind CSS, Next.js, Redux, Express.js, Material UI, MUI CSS, Bootstrap, React Native, Django
Paradigms
UX Design, Real-time Systems, Code Refactoring, Responsive Web Design (RWD), Web Performance Optimization (WPO), Mobile Web Design
Platforms
Firebase, Vercel, MacOS, Visual Studio Code (VS Code)
Storage
JSON, PostgreSQL
Other
Computer Science, Software Engineering, Information Technology, Web Development, User Experience (UX), Cursor AI, Zustand, Figma to React, WebSockets, Front-end, Full-stack Development, User Interface (UI), Styled-components, Supabase, CI/CD Pipelines, Deepgram, Groq, ElevenLabs Solutions, Claude Design, Product Engineering, Front-end Development, Back-end Development, FastAPI, Gemini API, LLM Agents, Agentic Coding, Storybook, Chakra UI, LLM Integration, Code Review, Engineering Design
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