Senior Frontend Developer React/Typescript (m/f/d)

For our client Mediatis we are looking for a Senior Frontend Developer (m/f/d) with a focus on TypeScript/React. Mediatis is a digital agency with two strong pillars: TYPO3 development and individual software development - increasingly with a focus on AI. 26 colleagues, very flat hierarchies, honest and solution-oriented approach - that's what describes Mediatis.

Tasks

As a Senior Frontend Developer, you will take on technical responsibility for the frontend of .NET-based projects. Your first field of activity: the ongoing migration from Angular to React as well as the further development of modern, long-lasting platforms - including the integration of AI features.

• Migration of existing frontends from Angular to React (TypeScript)
• Architecture, implementation and code reviews for new features
• Close collaboration with backend (C#/.NET) and QA
• Integration of AI functionalities (e.g. agent co-pilot, editor support, AI search)
• Active collaboration in Scrum sprints (4 weeks): Planning, reviews, estimations (planning poker rounds)
• Coordination with the customer (incl. international stakeholders)
• Quality assurance through testing and clean Git workflows

Requirements

• 5+ years of professional experience with React and TypeScript in larger projects
• Deep understanding of modern React patterns (hooks, state management, performance)
• Solid testing experience (e.g. Jest)
• Confident handling of Git and ticketing (Bitbucket, Jira)
• Very good English skills; German skills an advantage
• Senior mindset: independent, customer-oriented, strong communicator, able to take criticism

Nice-to-have

• Angular experience (helpful for the migration) & Vue.js knowledge (interfaces to the TYPO3 team)
• Basic knowledge of C#/.NET; alternatively backend experience with Java or Node.js
• Practice with AI-supported features or agent systems

Benefits

• Half-yearly bonus
• 30 days vacation
• 40 hours/week, very flexible working hours
• Home office: 1-2x per month in the office, the rest can be done from the HO
• Company pension plan, company supplementary health insurance
• Germany ticket, JobRad, optional company car, Edenred card
• Further training: 1x/year trade fair/conference, online courses
• Team culture: 1-2 offsites/year (partly with families), weekly games evening, fitness in the office

Sounds like your next step? Send us your CV and, if available, links to GitHub/portfolio. We look forward to hearing from you!