Hybrid Senior Frontend Engineer – ReactJS

at join.com

• Job title: Senior Frontend Engineer – ReactJS
• Job type: Full Time
• Experience level: Senior
• Salary: €67,000 - €80,000 per year
• Degree requirement: No Education Requirement
• Tech skills: Cypress, GraphQL, JavaScript, Jest, React, Redux, TypeScript
• Location requirements: Hybrid, Barcelona, Spain

About the role

• Senior Frontend Engineer at JOIN developing robust React features in a hybrid work environment. Collaborating across teams to enhance user experience for the recruitment platform.

Responsibilities

• Own frontend feature delivery end-to-end – from technical discovery and solution design to implementation, testing, rollout, and monitoring in production.
• Translate product requirements into scalable technical solutions, proactively identifying edge cases, UX trade-offs, and performance implications before implementation begins.
• Build complex, maintainable React components and application flows using TypeScript and modern frontend architecture principles.
• Drive technical quality within your scope by writing robust unit, and end-to-end tests and ensuring high reliability of shipped features.
• Actively contribute to architectural discussions, proposing improvements to frontend structure, state management patterns, performance optimisation, and scalability.
• Collaborate closely with Product and Design during discovery, challenging assumptions and ensuring solutions balance user experience, feasibility, and speed.
• Monitor and optimise performance and user experience in production, using metrics, logs, and analytics to continuously improve feature impact.
• Support incremental improvements to the Design System and shared components when feature development requires enhancements.
• Mentor less experienced engineers through collaboration and knowledge sharing (without formal people management responsibilities).

Requirements

• 4+ years of experience as a Frontend Engineer working with modern JavaScript frameworks (React preferred).
• Strong understanding of TypeScript, HTML5, and CSS3.
• Solid experience with state management libraries (Redux, Zustand, or similar).
• Knowledge of API integration patterns and data fetching (REST, GraphQL).
• Familiarity with testing frameworks such as Jest, React Testing Library, or Cypress.
• Understanding of CI/CD pipelines and version control using Git.
• Experience working collaboratively in cross-functional Agile teams.
• Strong focus on performance, accessibility, and usability.

Benefits

• Apple hardware – The best tools for the job (MacBook).
• Team events – Brunches, sports activities, and quarterly gatherings in Berlin.
• Productivity from Everywhere – 104 days per year remote (post-probation), following our hybrid policy.
• Relocation support – Assistance with paperwork, travel, and one month of furnished accommodation.