Middle/Senior Frontend Developer (React + TypeScript)

Back to Jobs
Sigma Software logo

Middle/Senior Frontend Developer (React + TypeScript)

Sigma Software

Location

Warsaw, Masovian Voivodeship, Poland

Experience

Mid

Posted

Jul 30, 2026

Apply by

August 29, 2026

Applicants

0

Early applicantEasy applyFull-timeWork from Office

Job Description

## Company Description We are looking for a Middle/Senior Front-end Developer to join our team and help us develop the best solutions for our clients. Working as a Front-end Developer on this project requires a mindset where we plan, build, and deliver together as a team. As a group, we take shared responsibility for delivery, including speed, efficiency, and quality. We also take full responsibility for the operational condition of what we deliver. As an individual, you’re expected to take ownership, drive initiatives forward, suggest, and incorporate improvements across all areas.  Does this sound like you? Take your chance and grow with us. CUSTOMER Our client is one of Europe’s biggest GameTech companies and owns of one of the largest mobile gambling platforms, with millions of users. It is a big company that follows a startup approach. The technology stack is modern and up-to-date. ## Job Description - Develop and maintain responsive web applications using React and TypeScript - Collaborate with designers and Back-end developers to deliver seamless user experiences - Work with GraphQL for data fetching and manipulation - Build modern and accessible UI components using Material UI or similar libraries - Participate in code reviews, sprint planning, and product discussions - Contribute to continuous improvements in performance and code quality ## Qualifications - At least 3 years of experience as a Front-end Developer - Hands-on experience with JavaScript and TypeScript - Experience with React - Good knowledge of GraphQL - Experience with Material UI - Experience with GitHub and/or other version control systems - Upper-Intermediate level of English

Key Responsibilities

  • Develop and maintain responsive web applications using React and TypeScript
  • Collaborate with designers and back-end developers to deliver seamless user experiences
  • Work with GraphQL for data fetching and manipulation
  • Build modern and accessible UI components using Material UI or similar libraries
  • Participate in code reviews, sprint planning, and product discussions
  • Contribute to continuous improvements in performance and code quality

Skills Required

ReactTypeScriptJavaScriptGraphQLMaterial UIGitHubVersion ControlCollaborationOwnershipCommunication

App exclusive · Free

Smart Job AI Coach

Your personal interview coach on every job — readiness tips, profile improvements, and role-specific prep. Available only in the Pulse Job app.

Interview readiness

See how prepared you are and what to improve for each role.

Personalized tips

Actionable suggestions based on your profile and the job.

After you apply

Keep coaching momentum from job detail through application success.

Get Smart Job AI Coach in the appFree on iOS and Android