Founding Software Engineer

About the Role

Join a Y Combinator\-backed AI SaaS startup as their first engineering hire. The company is building an AI\-powered motion design product that turns hours of animation work into minutes — already serving a rapidly growing user base. You'll work directly with the founders to shape the technical foundation, own end\-to\-end development, and help scale the product to millions of users.

What You'll Do

• Partner with founders to deliver user\-centric product solutions from concept to production.


• Own end\-to\-end development of full\-stack features with scalable architecture design.


• Build and optimize agentic LLM systems incorporating tool\-calling, multi\-step reasoning, and MCP protocols.


• Design comprehensive LLM evaluation frameworks with automated benchmarks, human\-in\-the\-loop validation, and A/B testing.


• Optimize LLM inference performance, cost efficiency, and latency across multiple model architectures.


• Develop a high\-performance motion graphics engine.


• Drive architectural decisions that support scalable growth to millions of users.

What We're Looking For

• 2\+ years of software engineering experience with strong CS fundamentals.


• Proficiency in TypeScript (required) and ideally the broader stack: React.js, Next.js, PostgreSQL, GCP, AWS.


• Hands\-on experience building or integrating LLMs, tool\-calling, multi\-step reasoning, and MCP protocols.


• Experience designing and implementing LLM evaluation frameworks — automated benchmarks, human\-in\-the\-loop validation, and A/B testing.


• Proven ability to deliver end\-to\-end full\-stack features with scalable architecture.


• Startup or early\-stage company experience with a strong ownership mindset.


• Proficiency in optimizing LLM inference performance, cost efficiency, and latency across multiple model architectures.

Location

This role is fully on\-site in Berlin, Germany. Visa sponsorship is not available.

Compensation

Salary range: €80,000 – €160,000 EUR annually, depending on experience. As an early founding engineer, you can expect meaningful equity alongside your base compensation.

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