About Block Labs Block Labs is a premier technology studio operating at the bleeding edge of Web3, Artificial Intelligence, and iGaming. we engineer high-scale,production-grade platforms that power the next generation of digital products. We are a collective of senior engineers, product strategists, and builders who refuse to compromise on architecture. Whether we are designing autonomous multi-agent AI systems, building decentralized financial infrastructure, or architecting high-frequency iGaming platforms, our standard is excellence. If you are looking to work alongside a team that values deep technical expertise, thoughtful system design, and product ownership, Block Labs is where you belong.
The role We are building the frontend of a multi-brand consumer platform in React, Next.
Js and TypeScript: one codebase serving several brands, where launching a brand should be a matter of configuration, not a copy. You will be the most senior frontend engineer in the company and the person the platform's UI depends on. You get an outcome and constraints, not a backlog: you find the decisions nobody has made, scope the work, build it, ship it and stay accountable for how it behaves in production.

Key Responsibilities
Own the frontend end to end: architecture, conventions, quality bar and production behaviour of a multi-brand platform, with no spec handed to you.
Make adding a brand a configuration change: theming, brand-aware routing and content, and clean boundaries between shared and brand-specific code, all on a live product.




Ship with AI coding agents every day as your main way of working, with the checks that keep quality high at agent speed, and raise the bar for how others use them.
Ship consumer-facing UI with real attention to detail, performance and accessibility.
Take UX and product concerns straight to the people who own the product, with alternatives and working examples, not just objections.
About You 8+ years building production consumer-facing web applications, several of them at Staff or equivalent ownership.
You have taken a frontend from a rough brief to production and owned it, and you can say exactly what was yours, what was your team's and what was your agents'. AI coding agents are how you build, not a helper.
You have your own setup and can say precisely where agents make you faster, where they produce plausible but wrong output, and how you catch it.
Deep expertise in React, Next.
Js and modern TypeScript, with clear opinions on rendering strategies and when each is the wrong choice.
Hands-on experience building or re-architecting multi-brand, multi-tenant or white-label frontends.
Strong UI and UX sensibility: you notice the small things and fix them without being asked.
Demonstrable Core Web Vitals work in production.
Strong command of written and verbal English.
Background in fintech, crypto, real-time gaming and entertainment platforms, or other high-traffic consumer products.
Working knowledge of CI/CD and cloud environments.

📌 Staff Frontend Software Engineer (España)
🏢 Block Labs
📍 España