Сервіс пошуку роботи №1 в Україні
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Fullstack Developer
- Місто:
- Черкаси
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Kostiantyn Voskoboinik
Senior Full Stack / Node.js Engineer
Email: [відкрити контакти ](див. вище в блоці «контактна інформація») | Phone: [відкрити контакти ](див. вище в блоці «контактна інформація») | Location: Cherkasy, Ukraine
LinkedIn: [відкрити контакти ](див. вище в блоці «контактна інформація») | GitHub: github.com/vkot91
PROFESSIONAL SUMMARY
Senior Full Stack Engineer with 5+ years of experience building web applications, APIs, real-time systems, and
internal platforms, with a strong focus on TypeScript across the entire stack.
Hands-on designing and shipping backend services in Node.js and NestJS, including REST APIs, JWT
authentication, background job processing, and PostgreSQL and Redis data layers.
Owns features end-to-end, from API and database design through React and Next.js frontends, with emphasis on
performance, maintainability, and reliable automated testing.
For the past 3+ years, delivered frontend and full-stack features end-to-end on a high-traffic Ruby on Rails
monolith, including admin tools used in production at scale.
Fluent in modern delivery practices: monorepos (Turborepo + pnpm), Dockerized services, CI/CD with GitHub
Actions, and end-to-end testing.
TECHNICAL SKILLS
TypeScript, JavaScript (ES6+), Node.js, NestJS, REST APIs, GraphQL (Apollo), WebSockets, JWT
authentication, PostgreSQL, Prisma, Redis, BullMQ, Zod, Docker, GitHub Actions, Turborepo, pnpm, Jest,
Playwright, React, Next.js, Redux, React Query, SSR, Ruby, Ruby on Rails, Hotwire (Turbo & Stimulus),
Storybook, Webpack, Minitest, HTML5, CSS3, SCSS
PROFESSIONAL EXPERIENCE
Senior Frontend / Full Stack Developer | Underdog Fantasy | USA | 09/2022 – 03/2026
• Delivered frontend and full-stack features end-to-end on a high-traffic Ruby on Rails monolith, integrating
REST APIs, authentication (Auth0, FusionAuth), and SSR-based applications.
• Resolved rendering and data-loading bottlenecks, improving load times and steadying behavior under heavy
load.
• Contributed to architecture decisions, code reviews, and technical direction, raising engineering standards
across the team.
• Engineered real-time dashboards and internal admin platforms (React, TypeScript, Next.js, Rails) used daily
by operations teams.
• Optimized data-heavy views with React Query, lazy loading, and virtualized rendering
• Migrated state management from XState to React Query, cutting boilerplate and simplifying core flows.
Front End Developer | Qubit Labs | Great Britain | 07/2021 – 09/2022
• Launched a large-scale content platform on Next.js with an SSR architecture.
• Created a library of reusable, responsive UI components and frontend systems adopted across 3 production
applications.
• Partnered with design teams to turn UI/UX concepts into maintainable, scalable implementations.
• Published and maintained a Storybook-based component library distributed as npm packages used
organization-wide.
Front End Developer | NEKLO LLC | 05/2021 – 08/2021
• Implemented UI features and resolved cross-browser issues on a Magento-based e-commerce application.
• Developed React-based product and filtering interfaces for high-traffic sections of the store.
Front End Developer | Nix Solutions | 01/2021 – 05/2021
• Created responsive, mobile-first React interfaces and modular component libraries.
PROJECTS
Social Media Platform | Personal Project | github.com/vkot91/monorepo-social-media
• Architected a full-stack TypeScript monorepo (Turborepo + pnpm) with a NestJS API and a Next.js frontend
sharing typed contract packages across apps.
• Developed AI-first with Claude Code, guided by a project AGENTS.md spec, while personally owning
architecture decisions, code review, and overall quality control.
• Implemented JWT authentication with access/refresh token rotation backed by Prisma and PostgreSQL, and
Zod schema validation for shared request and response contracts.
• Added asynchronous background processing with BullMQ (retry and backoff) on Redis for workloads such as
email delivery.
• Set up Dockerized PostgreSQL and Redis services and a GitHub Actions CI pipeline running real end-to-end
tests (Playwright) against an isolated, seeded test database.
EDUCATION
Master of Science, Computer Science (Web Applications)
Lublin University of Technology | 2016 – 2021
LANGUAGES
Ukrainian (native), Polish, English
Senior Full Stack / Node.js Engineer
Email: [
LinkedIn: [
PROFESSIONAL SUMMARY
Senior Full Stack Engineer with 5+ years of experience building web applications, APIs, real-time systems, and
internal platforms, with a strong focus on TypeScript across the entire stack.
Hands-on designing and shipping backend services in Node.js and NestJS, including REST APIs, JWT
authentication, background job processing, and PostgreSQL and Redis data layers.
Owns features end-to-end, from API and database design through React and Next.js frontends, with emphasis on
performance, maintainability, and reliable automated testing.
For the past 3+ years, delivered frontend and full-stack features end-to-end on a high-traffic Ruby on Rails
monolith, including admin tools used in production at scale.
Fluent in modern delivery practices: monorepos (Turborepo + pnpm), Dockerized services, CI/CD with GitHub
Actions, and end-to-end testing.
TECHNICAL SKILLS
TypeScript, JavaScript (ES6+), Node.js, NestJS, REST APIs, GraphQL (Apollo), WebSockets, JWT
authentication, PostgreSQL, Prisma, Redis, BullMQ, Zod, Docker, GitHub Actions, Turborepo, pnpm, Jest,
Playwright, React, Next.js, Redux, React Query, SSR, Ruby, Ruby on Rails, Hotwire (Turbo & Stimulus),
Storybook, Webpack, Minitest, HTML5, CSS3, SCSS
PROFESSIONAL EXPERIENCE
Senior Frontend / Full Stack Developer | Underdog Fantasy | USA | 09/2022 – 03/2026
• Delivered frontend and full-stack features end-to-end on a high-traffic Ruby on Rails monolith, integrating
REST APIs, authentication (Auth0, FusionAuth), and SSR-based applications.
• Resolved rendering and data-loading bottlenecks, improving load times and steadying behavior under heavy
load.
• Contributed to architecture decisions, code reviews, and technical direction, raising engineering standards
across the team.
• Engineered real-time dashboards and internal admin platforms (React, TypeScript, Next.js, Rails) used daily
by operations teams.
• Optimized data-heavy views with React Query, lazy loading, and virtualized rendering
• Migrated state management from XState to React Query, cutting boilerplate and simplifying core flows.
Front End Developer | Qubit Labs | Great Britain | 07/2021 – 09/2022
• Launched a large-scale content platform on Next.js with an SSR architecture.
• Created a library of reusable, responsive UI components and frontend systems adopted across 3 production
applications.
• Partnered with design teams to turn UI/UX concepts into maintainable, scalable implementations.
• Published and maintained a Storybook-based component library distributed as npm packages used
organization-wide.
Front End Developer | NEKLO LLC | 05/2021 – 08/2021
• Implemented UI features and resolved cross-browser issues on a Magento-based e-commerce application.
• Developed React-based product and filtering interfaces for high-traffic sections of the store.
Front End Developer | Nix Solutions | 01/2021 – 05/2021
• Created responsive, mobile-first React interfaces and modular component libraries.
PROJECTS
Social Media Platform | Personal Project | github.com/vkot91/monorepo-social-media
• Architected a full-stack TypeScript monorepo (Turborepo + pnpm) with a NestJS API and a Next.js frontend
sharing typed contract packages across apps.
• Developed AI-first with Claude Code, guided by a project AGENTS.md spec, while personally owning
architecture decisions, code review, and overall quality control.
• Implemented JWT authentication with access/refresh token rotation backed by Prisma and PostgreSQL, and
Zod schema validation for shared request and response contracts.
• Added asynchronous background processing with BullMQ (retry and backoff) on Redis for workloads such as
email delivery.
• Set up Dockerized PostgreSQL and Redis services and a GitHub Actions CI pipeline running real end-to-end
tests (Playwright) against an isolated, seeded test database.
EDUCATION
Master of Science, Computer Science (Web Applications)
Lublin University of Technology | 2016 – 2021
LANGUAGES
Ukrainian (native), Polish, English
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Резюме кандидата розміщено за адресою: https://www.work.ua/resumes/19028004/