Senior Frontend Developer for CRM Integrations Team

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. Why this role exists: This role exists to architect and deliver scalable, high-performance web interfaces. You’ll help us drive user engagement and shape our core product direction by owning the frontend architecture, mentoring the engineering team, and championing UI/UX best practices from initial design all the way to deployment. What you’ll drive: 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. What makes you a GR8 fit: Must-have • 5+ years in a senior frontend engineering role with a strong track record of shipping complex, user-facing web applications. • Deep JS/TS Mastery: Deep understanding of modern JavaScript (event loop, closures, async programming) and advanced TypeScript (generics, advanced types). • React Expertise: Strong command of React core concepts, component lifecycle, rendering optimization, and modern state managers (Redux, Zustand, etc.). • Web Fundamentals: Expert knowledge of the browser rendering pipeline, DOM manipulation, semantic HTML5, and CSS preprocessors (Sass/Less). • Tooling & Testing: Proficiency in configuring build tools (Webpack) and writing comprehensive automated tests. • Communication: The 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. Why you’ll love working here:  Benefits Cafeteria — annual budget you allocate to: Sports • Medical • Mental health • Home office • Languages. Work-life & support • 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. Our culture & core values: GR8 Tech culture is how we win — through trust, ownership, and a growth mindset. We move fast, stay curious, and keep it real, with open feedback, room to experiment, and a team that’s got your back. FUELLED BY TRUST: we’re open, honest, and have each other’s backs. OWN YOUR GAME: we take initiative and own what we do. ACCELER8: we move fast, focus smart, and keep it simple. CHALLENGE ACCEPTED: we grow through challenges and stay curious. BULLETPROOF: we’re resilient, ready, and always have a plan.