Frontend Engineer – React & TypeScript – Freelance – Hybrid (Portugal)

About the role

We are looking for a Senior Frontend Engineer to join a fast‑growing EV charging scale‑up. The role is freelance, based in Portugal with a hybrid setup in Porto or Lisbon, and focuses on building user‑facing platforms that power thousands of chargers across Europe.

Key responsibilities

• Design, develop and scale sophisticated React 18+ applications using TypeScript.
• Own end‑to‑end user journeys such as authentication, payments and charger management flows.
• Influence frontend architecture decisions including state management, routing, performance and observability.
• Integrate with microservices via gRPC and REST APIs.
• Champion testing, monitoring (e.g., Sentry) and CI/CD best practices.
• Collaborate closely with product, design, backend and operations teams.

Required profile

• 3–6 years of experience building production‑grade frontend applications.
• Strong expertise in React 18+ and TypeScript.
• Hands‑on experience with TanStack Query, TanStack Router and React Hook Form.
• Solid testing background using Jest/Vitest and Cypress or Playwright.
• Experience integrating with gRPC/REST microservices.
• Observability mindset with tools like Sentry.

Required skills

• React
• TypeScript
• TanStack Query
• TanStack Router
• React Hook Form
• Jest
• Vitest
• Cypress
• Playwright
• gRPC
• REST
• Sentry (or similar observability tool)
• CI/CD pipelines

What we offer

• High autonomy with strong product and design partners.
• Freelance contract managed by Shakers, handling invoicing and administration.
• Opportunity to ship features used daily by a growing European EV network.
• Hybrid work environment in Portugal.