Senior Full Stack Developer React/FastAPI/Django (Frontend-Affinity)
Get Mika GmbH · Berlin, DE
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Senior Full Stack Developer React/FastAPI/Django (Frontend-Affinity) (m/f/d)
Berlin, Germany or remote
On-site
Salary Range
Role Type
Full Time
mika is revolutionizing financial management for small businesses with an AI-powered platform that combines automated accounting, proactive insights, and conversational AI. Were on a mission to make expert financial navigation and compliance accessible to every small business owner – dramatically reducing costs and bureaucratic burden. Were a small, senior team shipping fast, and every line of code we ship matters.
Our stack: FastAPI & Django backend, React frontend (Material UI, react-query), PostgreSQL, AWS. We build agentic AI systems that do real accounting work.
We need a Senior Full-Stack Developer who leans frontend – someone who makes our product look and feel as good as it works under the hood.
Youll own features end-to-end. That means you think through the entire user flow, edge cases, error states, and architecture before you start building. You work with high autonomy and take real ownership – we trust you to make good decisions and deliver clean solutions.
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Concretely, youll:
- Drive frontend improvements – not just fixing bugs but proactively elevating UX and visual quality on a regular cadence.
- Build and own complex full-stack features in our accounting platform.
- Use Claude Code, Cursor, or similar AI engineering tools as your primary development workflow – we are a senior team where everyone writes high-quality code at a high pace, and this is only possible through the use of the latest coding tools. Youll get access to all the subscriptions you need to work efficiently.
- Adapt and extend our Python/FastAPI & Django backend where needed (CRUD-level changes and beyond).
- Contribute to code quality and architecture decisions in a small senior team.
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Qualifications:
- Professional experience in software development with a proven track record of owning and delivering complex projects.
- Expertise in React to build high-quality, accessible, and production-ready user interfaces.
- A sharp eye for design that ensures layouts and components are implemented with pixel-perfect accuracy.
- Hands-on skill with AI-assisted engineering using tools like Cursor, Claude Code, Codex, or GitHub Copilot. You have already built real things with those tools.
- The ability to work across the stack by independently navigating and extending a Python/FastAPI backend.
- A systems-thinking mindset to map out full features, edge cases, and failure modes before writing any code.
- Fluency in English, while any knowledge of German is a welcome bonus.
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Nice to have:
Background in agentic AI systems or LLM-powered products.
Familiarity with B2B fintech, PostgreSQL, or German accounting standards like DATEV.
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We welcome applications from people of all backgrounds, genders, and identities.
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Interested?