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Senior Product Engineer, Frontend

Frontend Developer • Senior • Remote • Full-time • Portugal Portugal

Join the team building Zerion Wallet and own product experiences end to end, from shaping the problem to launch and iteration. They want strong frontend skills, product judgment, and a high bar for design.

Responsibilities

  • ▹Own complex product features end to end, from understanding the problem through implementation, launch, and iteration
  • ▹Work closely with the product team, challenge assumptions, and turn ambiguous problems into great product experiences
  • ▹Build polished, responsive product experiences using React and TypeScript
  • ▹Prototype and iterate on interactions quickly, using code, design tools, and AI
  • ▹Obsess over details: interaction, motion, responsiveness, loading states, transitions, and microinteractions
  • ▹Build and evolve reusable frontend components and the design system
  • ▹Proactively identify and improve weak spots in the existing product experience
  • ▹Maintain a high bar for performance, accessibility, reliability, and frontend quality

Requirements

  • ▹5+ years of experience building high-quality, customer-facing web products
  • ▹Excellent knowledge of React, TypeScript, modern CSS, and browser technologies
  • ▹A track record of owning and shipping complex product features end to end
  • ▹Strong product and UX judgment
  • ▹Exceptional attention to detail
  • ▹Experience building sophisticated animations and interactive UI
  • ▹Strong understanding of modern frontend engineering practices
  • ▹Strong command of HTML, CSS, browser APIs, and modern frontend architecture
  • ▹Experience building responsive, high-performance web applications
  • ▹Experience with animation and interaction libraries and complex UI transitions
  • ▹Experience building reusable component systems and frontend abstractions
  • ▹Strong understanding of frontend performance, accessibility, and cross-browser behavior
  • ▹AI-native workflow as the default for exploration, implementation, debugging, and iteration

Nice to have

  • ▹Experience building or evolving design systems and component libraries
  • ▹Strong Figma skills

Soft skills

Strong ownership mindsetAbility to turn an ambiguous problem into a concrete solutionComfortable in a fast-paced startup, working on multiple problems in parallelClear and proactive communication in a distributed team

About the company

The team building Zerion Wallet.

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