Senior Frontend Developer

GB2B - GamingB2B; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Competitive compensation

Job summary

GB2B - GamingB2B in Warsaw is seeking a skilled Frontend Engineer to build high-performance React/TypeScript applications and optimize render times and UX. You will collaborate with backend engineers, work with Redux/RTK and modern frontend tooling, and contribute to modular, scalable architectures including monorepos and module federation, balancing usability with technical feasibility.

We value a product mindset, clean code, and teamwork, and offer competitive compensation and benefits to help

Qualifications

• Solid experience with React, TypeScript, HTML, and CSS.
• Hands-on experience with state management systems (Redux, RTK, Context API, or similar).
• Strong understanding of application performance optimization and profiling techniques.

Responsibilities

• Build high-performance, responsive applications using React and TypeScript.
• Optimize rendering, load times, and overall application performance.
• Collaborate with backend engineers to integrate APIs and real-time data streams.
• Ensure high-quality code using best practices in HTML, CSS, and modern frontend tooling.
• Participate in code reviews and continuous improvement of team processes.

Skills

React expertise

TypeScript

HTML/CSS

Performance optimization

Code quality

Problem-solving

Collaboration

Tools

Redux

RTK

Context API

Monorepo tooling

Module federation

Job description

• Build high-performance, responsive applications using React and TypeScript.
• Optimize rendering, load times, and overall application performance.
• Work with Redux, RTK, RTK Query, or other state management systems to manage complex application data flow.
• Architect modular and reusable components, supporting monorepo setups and module federation.
• Collaborate with backend engineers to integrate APIs and real-time data streams.
• Ensure high-quality code using best practices in HTML, CSS, and modern frontend tooling.
• Participate in code reviews, mentoring, and continuous improvement of team processes.
• Contribute to product discussions, helping shape solutions that balance usability, technical feasibility, and business goals.

Requirements:

• Solid experience with React, TypeScript, HTML, and CSS.
• Hands-on experience with state management systems (Redux, RTK, Context API, or similar).
• Strong understanding of application performance optimization and profiling techniques.
• Familiarity with monorepo architecture, module federation, or other scalable frontend architectures.
• Demonstrated product mindset — ability to understand and navigate trade-offs between user experience, business needs, and technical constraints.
• Ability to write clean, modular, and maintainable code.
• Strong problem-solving skills, attention to detail, and a collaborative approach.

Why Join GB2B:

• Work on cutting-edge, large-scale projects in the iGaming industry.
• Join a high-performing team solving real-world challenges.
• Competitive compensation and benefits.
• Opportunity to influence architecture, tooling, and the future of our frontend
• platform.

If building scalable, performant, and modern frontend applications excites you, we’d love