Freelance Full Stack Developer

Worldwide Salaried Open

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).

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