Senior Frontend Developer
Description
GR8_TECH builds B2B iGaming platforms for operators who play to lead. We deliver full-cycle, high-impact tech designed to scale — from seamless integrations and expert consulting to long-term operational support. Our platform powers millions of active players and drives real business growth. Call it what it is: the iGaming Platform for Champions. With 1000+ GR8 people across locations and time zones, we don’t just ship technology — we help operators build success stories across brands, markets, and geos. Our ambition drives us. Our people make it real. If you’re a challenger in spirit and a champion in action — join us.
Responsibilities
- Architect scalable and maintainable front-end solutions using React, modern JavaScript, and TypeScript.
- Drive the adoption of efficient state management and modular build processes (e.g., Webpack, module federation).
- Design resilient, failure-tolerant systems that account for load, performance, and web security (CORS, CSP, OWASP).
- Ship complex, high-quality code to production in a timely manner to meet crucial business expectations.
- Optimize web pages for maximum speed and scalability by deeply tuning the event loop and rendering steps (style, layout, paint, composite).
- Validate code reliability by building out comprehensive testing infrastructure (Jest, React Testing Library, unit/integration testing).
- Mentor junior developers and elevate team standards through thorough, constructive code reviews.
- Partner with Product Managers, Designers, and Delivery Managers to align technical execution with overarching business goals.
- Unblock the team by debugging deeply rooted technical issues and creating Proof of Concepts (POCs) for new technologies.
Requirements
- 5+ years in a senior frontend engineering role with a strong track record of shipping complex, user-facing web applications.
- Deep understanding of modern JavaScript (event loop, closures, async programming) and advanced TypeScript (generics, advanced types).
- Strong command of React core concepts, component lifecycle, rendering optimization, and modern state managers (Redux, Zustand, etc.).
- Expert knowledge of the browser rendering pipeline, DOM manipulation, semantic HTML5, and CSS preprocessors (Sass/Less).
- Proficiency in configuring build tools (Webpack) and writing comprehensive automated tests.
- The ability to clearly articulate complex architectural decisions and trade-offs to both technical and non-technical audiences.
- Upper-Intermediate+ English and fluent Ukrainian.
- Familiarity with microservice/event-driven architectures and client-server communication (REST APIs, WebSockets).
- Experience with Cloud/DevOps practices (Docker, CI/CD pipelines, basic AWS/GCP/Azure knowledge).
- Basic understanding of backend database concepts (SQL/NoSQL) and broader system analysis.
Benefits
- Annual budget allocated to: Sports, Medical, Mental health, Home office, Languages.
- Paid maternity/paternity leave + monthly childcare allowance.
- 20+ vacation days, unlimited sick leave, emergency time off.
- Remote-first + tech support + coworking compensation.
- Team events (online/offline/offsite).
- Learning culture with internal courses + growth programs.
