Open to new opportunities

Jerzy
Litwinienko

Senior Front-End Developer

12+ years of experience

Senior Frontend Engineer designing and building scalable web platforms using React and TypeScript. Technical leader shaping frontend architecture in large-scale SaaS environments, focused on performance, maintainability, and high-quality user experiences.

Get in touch Download CV
JL
scroll
Expertise

What I bring to the table

⚡

React & TypeScript

Building large-scale, maintainable React and TypeScript applications for global SaaS platforms with a focus on performance and clean architecture.

ReactTypeScriptJavaScript ES6+ReactQuery
🏗️

Frontend Architecture

Designing and implementing microfrontend architectures that scale across multiple product teams. Expert in Flux/Redux patterns and state management.

MicrofrontendsFlux/ReduxWebpack
🎨

UI & Design Systems

Crafting consistent, pixel-perfect interfaces from Figma specifications using Material UI and modern CSS. Bridging design and engineering seamlessly.

Material UICSS3HTML5Figma
🔬

Testing & Quality

Ensuring code quality through comprehensive unit and integration testing strategies. Conducting thorough code reviews to maintain high engineering standards.

JestUnit TestingIntegration TestingCode Review
🚀

DevOps & Platform

Streamlining CI/CD pipelines and containerized deployments. Experienced with Kubernetes and Docker for scalable frontend infrastructure.

DockerKubernetesGitLab CI/CDGit
💡

Leadership & Mentoring

Leading cross-functional frontend teams across international offices. Mentoring developers, contributing to hiring decisions, and driving Agile practices.

Team LeadMentoringScrum/KanbanHiring
Career

Work history

Jul 2022 – Present Housecall Pro · Remote

Senior Front-End Developer

  • Developed and maintained large-scale React and TypeScript application for a global SaaS platform
  • Implemented UI components using Material UI and Figma specifications
  • Collaborated with cross-functional teams (product, design, backend) to deliver scalable features
  • Conducted code reviews and contributed to hiring and technical decisions
TypeScriptReactReactQueryGitLab CI/CDMaterial UIFigmaCursor
Jun 2016 – Jul 2022 Sportradar · Warszawa

Technical Team Leader

  • Led frontend team delivering a high-traffic platform for international bookmakers
  • Designed and implemented microfrontend architecture to scale across multiple product teams
  • Built applications using React, Flux, ImmutableJS, and modern JavaScript tooling
  • Worked with Kubernetes and Docker for containerized frontend deployments
  • Mentored developers and cooperated with international teams in Norway and the UK
ReactFluxImmutableJSKubernetesDocker
Jun 2015 – Apr 2016 4Decision · Warszawa

Front-End Developer

  • Developed SPA application for financial departments and accounting firms
  • Collaborated with backend teams to integrate APIs and deliver responsive interfaces
Backbone.jsCoffeeScriptJavaScriptCSSLess
Nov 2013 – May 2015 Softserve · Iwano-Frankiwsk

Front-End Developer

  • Developed web solution for a global property rental platform (cabins, villas, castles and more)
  • Built a web application for storing and managing health insurance claim denials
  • Built client-side applications using Backbone.js, JavaScript, HTML, CSS, and Less
Backbone.jsJavaScriptHTMLCSSLess
Let's talk

Ready to build something great?

Open to new roles, freelance projects, and interesting conversations. Drop me a message — I reply within 24h.

jlitwinienko26@gmail.com +48 881 693 510 Download CV