Senior Frontend Developer

Erasys

Hybrid Hybrid permanent

Posted: January 13, 2026

Quick Summary

A senior frontend developer with experience working with React Native and React.js/Next.js is required for this role. The ideal candidate will have expertise in optimizing web performance and contributing to code quality. The successful candidate will work closely with cross-functional teams to deliver scalable and high-quality applications.

Required Skills

Job Description

Your journey:
We are looking for an experienced and highly motivated frontend developer to join our team. As a senior frontend developer you maintain and enhance cross-platform applications using React Native and React.js/Next.js. This role involves collaborating with cross-functional teams, optimizing web performance (Core Web Vitals), integrating APIs with backend engineers, and ensuring code quality through mentoring and code reviews

Key Responsibilities• Develop, and maintain scalable cross-platform applications using React.js and React Native.
• Participate in requirement discussions, technical design, and code reviews.
• Collaborate with designers, and product managers to deliver exceptional user experiences.
• Optimise frontend performance, stability, and usability across browsers and devices.
• Collaborate with backend engineers to integrate APIs and ensure reliable data flow.
• Deliver features according to requirements and agreed delivery timelines.
• Research and experiment with new technologies to support the evolution of frontend engineering practices within the team.

We look for:
Required Skills & Experience• Extensive experience (5+ years) with React, TypeScript, and modern frontend development, with a proven track record of architecting scalable solutions.
• Experience with server-side rendering (SSR), static site generation (SSG), and API routes in Next.js.
• Advanced understanding of web performance optimization, especially related to Core Web Vitals, SSR patterns, and monitoring tools like Sentry.
• Deep knowledge of modern CSS, including preprocessors (e.g., SASS), and extensive experience utilizing utility-first CSS frameworks like Tailwind CSS to build maintainable and scalable UIs.
• Ensure accessibility, responsiveness, and cross-browser compatibility.
• Excellent analytical and problem-solving skills.
• Able to lead and drive technical projects and improvements across an engineering organization.
• Ability to write efficient, maintainable, and scalable code.
• Strong communication skills with the ability to work effectively in a team environment.
• Mentor and coach mid-level engineers, raising the quality bar for code reviews, testing practices, and overall system design
• Demonstrated ability to mentor engineers and contribute to team-wide knowledge sharing.
• Background in monorepos, one-app architectures, and shared-type and component strategies between Web and React native

Nice to have would be:
• Experience in React Native, including native modules, reusable component libraries, performance optimizations, and third-party integrations is big plus
• Understanding of GenAI workflows and the ability to effectively leverage advanced engineering tools to increase development speed and quality.
• Experience with CI/CD pipelines, deployment processes, and cloud infrastructure (CI/CD pipelines, Docker, Kubernetes).
• Experience working with component libraries and design systems.

What We Offer:
• Everything you need to do a great job (MacBook etc.)
• Free weekly German classes to help you adjust to Berlin life.
• Wellpass gym access and a lot of other perks.
• Flexible hours with hybrid working between our great offices and from home.
• A friendly, diverse group of colleagues from all different nationalities, genders and orientations!

Reach out to us and become part of our story! We are looking forward to reading about your motivation and seeing your CV.

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