Block Labs - Senior Frontend Engineer
Requirements
• Hands-on experience designing or maintaining multi-tenant frontends, including theming, templating, white-labeling or partner-configurable UI • Solid track record working with micro frontend architectures (module federation, monorepos, independent deployables) and a clear understanding of the trade-offs • Demonstrable experience hitting tight Core Web Vitals targets in real production environments: profiling LCP, optimising critical rendering paths, image and font strategies, code splitting, edge caching and server components • Fluency with AI-assisted development tools (Cursor, Claude Code, Copilot) and a clear point of view on how to use them to ship faster without compromising quality • Comfortable with modern build tools (Bun, Vite, Webpack, Turbopack) and testing frameworks (Playwright, Cypress, Vitest) • Working knowledge of DevOps practices and containerisation in cloud environments • Strong command of both verbal and written English • Background in fintech, DeFi, real-time gaming and entertainment platforms or other high-traffic consumer products is a strong plus • What kind of culture can I expect?Mature, mission-driven, and low-ego. We value clarity over noise, outcomes over theatrics, and pace without chaos. If you’re one of the smartest minds in your craft and want to build with other experts, you’ll feel at home here. • What kind of culture can I expect?
Responsibilities
• Rebuild an existing customer-facing product UI and launch a new branded experience for an incoming partner, both running on shared multi-tenant foundations • Design and own the templating and theming system that lets us spin up differentiated UIs per tenant without duplicating codebases • Architect and maintain micro frontend boundaries across our platforms so teams can ship independently while keeping shared user journeys consistent • Hit and defend strict Core Web Vitals targets (LCP, INP, CLS), enforcing performance budgets and shipping measurable optimisations • Build, maintain and refactor modular Next.js and React interfaces with reusability and tenant configurability as first-class concerns • Use AI coding tools (Cursor, Claude Code or equivalent) as a core part of your daily workflow to accelerate scaffolding, refactoring, test generation and overall shipping velocity • Collaborate with product and backend engineers to define API contracts, feature behaviour and tenant-specific configuration • Advocate for clean, testable and maintainable code through peer reviews, documentation and a strong shared design system • You have 5+ years of frontend engineering experience building production-grade, consumer-facing web applications • Deep expertise in React and modern TypeScript, with strong opinions on rendering strategies (SSR, SSG, ISR, React Server Components) and when to apply each
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