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Web3 Incubator & Investment
Senior Frontend Engineer
Location
Portugal
Posted
86 days ago
Salary
0
Seniority
Senior
Job Description
Senior Frontend Engineer
Block Labs
• Help build and ship high-performance, modular and visually distinct interfaces across our multi-tenant platforms • Work within cross-functional teams of engineers, product managers and designers, owning the frontend layer that powers multiple white-labeled experiences for partner brands • 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
Job Requirements
- 5+ years of frontend engineering experience building production-grade, consumer-facing web applications
- Deep expertise in Next.js, React and modern TypeScript, with strong opinions on rendering strategies (SSR, SSG, ISR, React Server Components) and when to apply each
- 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.
Benefits
- Health insurance
- Flexible work hours
- Professional development opportunities
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