Senior Frontend Engineer — Multi-Brand UI & AI-Powered

Block Labs; Lisboa; On-site; EUR 80,000 - 120,000; Full time

Job summary

Block Labs in Lisbon is seeking a Staff Software Engineer, Frontend to own the frontend end-to-end of a multi-brand platform built in React, Next.js and TypeScript. You will shape architecture, implement theming and brand-specific boundaries, and ship production-grade UI with accessibility and performance in mind.

You will work as a small number of senior individual contributors, taking prototypes with AI tooling and steering them into production, owning outcomes, and ensuring code quality while

Qualifications

• 8+ years building production consumer-facing web applications.
• Proven expertise in React, Next.js and TypeScript.
• Experience architecting multi-brand, multi-tenant frontends.
• Built or owned a design system with governance and adoption.

Responsibilities

• Own the frontend end-to-end: architecture, conventions, quality bar and production behavior of a multi-brand platform.
• Make adding a brand a configuration change: theming, brand-aware routing and content boundaries.
• Build and own the design system and component library used by engineers, designers and AI prototyping.
• Turn prototypes into production features quickly and establish repeatable workflows.
• Ship with AI coding agents as part of daily development to accelerate delivery and quality checks.
• Deliver consumer-facing UI with attention to detail, performance and accessibility.
• Advocate UX and product concerns with working examples to stakeholders.

Skills

React

Next.js

TypeScript

UI/UX

Design systems

AI tooling

Multi-brand

Job description

Block Labs in Lisbon is seeking a Staff Software Engineer, Frontend to own the frontend end-to-end of a multi-brand platform built in React, Next.js and TypeScript. You will shape architecture, implement theming and brand-specific boundaries, and ship production-grade UI with accessibility and performance in mind.

You will work as a small number of senior individual contributors, taking prototypes with AI tooling and steering them into production, owning outcomes, and ensuring code quality while