Senior Frontend Developer

• Design, implement, and maintain user-facing features in React for our internal and customer-facing web applications.
• Build and evolve reusable component libraries and design patterns for a consistent user experience.
• Integrate frontends with our Python/FastAPI APIs and Postgres-backed services.
• Assess integrations and expand their scope to avoid OWASP Top 10 and other common security flaws.
• Collaborate with product managers, designers, and backend engineers to deliver end-to-end features.
• Use GenAI-assisted tooling (e.g., Claude Code, Lovable) in a thoughtful way to speed up prototyping, refactoring, and boilerplate-heavy tasks.
• Ensure performance, accessibility, responsiveness, and cross-browser compatibility of our applications.
• Contribute to and improve our frontend architecture, testing strategy, and code quality standards.
• Participate in code reviews and knowledge sharing to keep the team aligned and the codebase healthy.
• Stay up to date with modern frontend, React, and web platform best practices.

• At least 4 years of experience building modern web applications, with a strong focus on React and its ecosystem (e.g., TanStack Query, React Router).
• Solid skills in JavaScript and TypeScript, plus a good understanding of HTML5 and CSS3 (including utility-first frameworks such as Tailwind and component-level styling approaches).
• Experience with headless component libraries (e.g., Radix UI / shadcn) and rich-text editors (e.g., TipTap / ProseMirror) is a plus.
• Experience integrating frontends with RESTful or GraphQL APIs; comfort working against a non-JavaScript backend is a plus.
• Working knowledge of relational databases (Postgres in particular) and how frontend needs shape API and data design.
• Familiarity with version control (Git), CI/CD workflows, and modern build tooling (e.g., Vite, Webpack, or similar) as well as security best practises following OWASP Top 10 for web applications and similar.
• Experience with testing frameworks and tools (e.g., Vitest or Jest, React Testing Library, Playwright/Cypress) is a plus.
• First-hand experience or strong interest in using GenAI-assisted development tools (e.g., Claude Code, Lovable) and a willingness to experiment responsibly with them.
• Strong grasp of performance optimization and scalable frontend architecture.
• Experience with agile methodologies.
• B2 level English language skills (German is a plus).

Pulled from the full job description

• Flexible schedule, * A competitive gross annual salary ranging from €60K-€80K, based on experience and expertise.
• Up to 100% remote work opportunity.
• Provision of MacBook and peripherals for remote work setup.
• Flexible working hours, with full-time or part-time options (30h-37.5h per week).
• Six weeks of paid annual leave.
• A comprehensive educational package to support your professional development.

Semalytix (https://www.semalytix.com/) is pioneering patient-centric decision-making and treatment through comprehensive analysis of millions of real-world data points. Our multidisciplinary team combines expertise from Artificial Intelligence, Machine Learning, Linguistics, Life Sciences, Pharmaceuticals, and SaaS start-ups, committed to enhancing lives with superior decision-making tools. Founded in 2015 with headquarters in Bielefeld, Germany, Semalytix is a VC-funded enterprise with a dynamic and dedicated team of about 30 members, serving three top-10 Pharma customers.