Senior Frontend Developer

GR8 Tech builds B2B iGaming platforms for operators who play to lead. They deliver full-cycle, high-impact technology designed to scale, including seamless integrations, expert consulting, and long-term operational support. Their platform powers millions of active players and drives real business growth. The company has over 1000 employees across multiple locations and time zones.

Must-have:

• 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.
• Ability to clearly articulate complex architectural decisions and trade-offs to both technical and non-technical audiences.
• Upper-Intermediate+ English and fluent Ukrainian.

Nice to have:

• 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.

Architecture & Strategy:

• 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).

Delivery & Execution:

• 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).

Team & Leadership:

• 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.