Senior Frontend Developer

About The CompanyZetaLabs is a fast-growing startup building next-generation AI-driven products. Backed by significant investment, we’re scaling fast and need exceptional engineers to help us deliver seamless, high-performing user experiences.About The RoleLead frontend development with React/Next.js, optimize UX/UI, ensure performance, integrate with backend, and mentor team in a fast-growing AI startup.We’re looking for a Senior Frontend Developer who thrives in high-growth environments. Someone who can take ownership of the frontend, turn complex ideas into elegant, user-friendly interfaces, and ensure our products evolve in step with rapid business and revenue growth.What You’ll DoLead the frontend: Architect, build, and optimize user-facing applications with React/Next.js and modern tooling.Own UX/UI quality: Collaborate with product and design to deliver intuitive, high-performance experiences.Performance focus: Ensure apps remain fast, scalable, and reliable as adoption grows.Integration: Partner with backend and AI/ML engineers to build seamless end-to-end functionality.Best practices: Champion clean code, testing, and maintainability across the frontend team.Mentorship: Share expertise and support less senior developers, raising the overall bar.Requirements5+ years of experience as a frontend engineerExpertise in React.js, Next.js, and modern JavaScript/TypeScriptProven experience building products in fast-scaling startups or scale-upsLocation: Warsaw preferred; exceptional EU-based remote candidates consideredRequired SkillsReact.jsNext.jsJavaScriptTypeScriptfrontend architectureperformance optimizationresponsive designUX/UI qualityclean codetestingmentorshipBenefitsCompetitive salary up to €120,000 annuallyStrong compensation packageFuture opportunities for equity participationLeadership growth opportunitiesTeam membersCollaborate with top-tier engineers who have scaled companies like Personio and Granola.Salary: 100000 - 120000 EUREquity: Future opportunities for equity participation and leadership growth.