Freelance Full Stack Developer

Responsibilities:

• Turning loosely defined business problems into concrete technical solutions.
• Designing and building backend and full-stack services using TypeScript, Node.js, and Next.js .
• Creating AI-powered workflow automation using frameworks like Mastra, LangChain, or similar.
• Integrating and experimenting with leading LLMs (Claude, ChatGPT, Gemini) and routing platforms such as OpenRouter.
• Building observability and evaluation into AI systems (LangSmith, Langfuse, LangWatch, or custom tooling).
• Deploying and maintaining cloud infrastructure on AWS and/or GCP.
• Working with serverless architectures (e. g. AWS Lambda).
• Managing infrastructure via infrastructure-as-code (CloudFormation; Terraform a plus).
• Setting up and improving CI/CD pipelines.
• Prototyping quickly, shipping iteratively, and refining based on real customer and stakeholder feedback.
• Collaborating directly with the CTO on architecture, AI strategy, and long-term technical direction.
• Developing a working understanding of insurance workflows and translating domain complexity into scalable systems.

Requirements:

• Strong experience with TypeScript, Node.js, and modern web/backend frameworks.
• Hands-on experience with Next.js, serverless systems, and cloud-native development.
• Experience with AI orchestration frameworks (LangChain, Mastra, or equivalents).
• Practical experience working with modern LLMs and multi-model setups.
• Solid knowledge of AWS and/or Google Cloud Platform.
• Experience with CI/CD, automated testing, and deployment workflows.
• Proven ability to understand business context quickly.
• Comfort working from ambiguous, high-level requirements.
• Strong product and customer intuition, you think in terms of users, workflows, and outcomes.
• Ability to turn minimal direction into clear technical plans, fast prototypes production-ready systems.
• High ownership and reliability in a remote, async-first setup.
• Comfortable using AI tools daily as part of your development and thinking process.
• Clear, structured communication in English (German is a huge plus; all the test data is in German).