Senior Full-Stack Developer (Frontend Focus)

mika is revolutionizing financial management for small businesses with an AI-powered platform that combines automated accounting, proactive insights, and conversational AI. We're on a mission to make expert financial navigation and compliance accessible to every small business owner – dramatically reducing costs and bureaucratic burden. We're 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.

You'll 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.

Concretely, you'll:

• 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. You'll 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

• 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.

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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• A small team of strong, senior engineers who respect each other's time.


• Real autonomy and ownership from day one.


• Work that's genuinely hard and interesting – German tax law + AI agents is not a solved problem.


• Competitive salary and a product that's actually used by real customers daily.


• Almost no meetings – on average 95% focus time per day.


• 100% Remote option, option to work abroad and no minimum required office attendence.


• Fully flexible working hours apart from Daily Standup.


• Berlin location preferred but remote possible.

We welcome applications from people of all backgrounds, genders, and identities.