Product Engineer (AI Apply)

Product Engineer (AI) @Kombo

Berlin (On-site) · Full-time

Kombo (YC S22) is building HR tech infrastructure that saves engineering teams hundreds of hours by replacing the need for dozens of integrations with one. We're looking for a product-minded full-stack engineer to help build and scale products for a rapidly growing customer base. This is a Berlin-based onsite role.

Kombo is building the unified API for HR, payroll, and recruiting systems. Instead of companies spending months integrating with dozens of different systems, they can integrate once with Kombo and instantly connect to over hundred platforms. We abstract away the complexity of handling different data schemas, authentication methods, and API quirks.

Since going through Y Combinator in 2022, we:

• Grew from zero revenue to $8M+ ARR and hundreds of customers in 24 months (growth-wise among the ~top-5% of VC-backed startups)
• Scaled to process data for the equivalent of 10% of Germany's workforce
• Raised $8M+ of funding from Y Combinator, 468 Capital and other top-tier investors
• Grew to a team of 45+ Kombies!

As a Product Engineer (AI), you'll take full ownership of major features in our AI Apply product — architecting our product, working closely with customers, and shipping high-impact features end-to-end.

Projects you would have worked on in the past:

• Using LLMs to power browser automations to parse and apply to job pages at scale
• (De)-validating an internal MCP for building integrations more efficiently in a few-week PoC

Stack: TypeScript (required), Node.js, React, PostgreSQL, GCP, Docker, Prisma, Gemini & Langfuse.

Hands-on experience with LLMs and context engineering in production use cases is highly valued.

You don't need to know everything — we value strong fundamentals and learning velocity.

You're joining at a critical time. This means:

• You'll build features that customers actively request and start using the same day - we often get "when can we have this?" messages within hours of releasing new features
• Identify and solve problems without bureaucracy — we release 20+ times per day and move fast
• Operate in a high-growth environment (2–3× per year) that feels like a new company every few months

We hire entrepreneurial engineers who want to move fast and maintain a high bar for quality.

On a high level, we are looking for entrepreneurial people that are at the top-of-their-game. People at Kombo come from Harvard, Oxford, Stanford, CODE etc., 50% are ex-founders themselves and in general have always done hard, impressive things. Specifically for this role, we are looking for the following skills:

• Expertise in designing B2B Software applications
• Familiarity with major LLM providers (OpenAI, Anthropic, Google, open-source models) and their APIs
• Ideally 3+ years of software development experience
• Proficiency or capacity to learn our tech stack: Node.js, React, Postgres, Prisma, TypeScript
• Experience with LLM observability and evaluation frameworks (Braintrust, Langfuse, etc.)
• Enthusiastic and collaborative work attitude
• Previous founding experience is a plus!

This role is perfect for an experienced engineer looking to join a company that has already proven product-market fit but is still in its early days. You are likely a great fit, if:

• You thrive when you have autonomy, own as many of the details as possible, and project manage your own work
• You have strong engineering fundamentals, code efficiently, and you know what you're great at and what you're less great at
• You dislike meetings and would much rather focus your time on building, being productive, and shipping code
• Location: This is a Berlin-based onsite role — we believe the best ideas happen together, in person.

Note that while we are rather looking for senior candidates at the moment, we are open to various levels of experience, and if in doubt, please apply :)

Our culture is built around two pillars: high ambition (and thus high-performance) while still providing a fun and supportive environment.

Some tidbits that illustrate this:

• We aspire to create an environment of few but very high-performing team members (similar to Netflix or Ashby).
• Even though we are in-office, we have a strong writing culture and use long-form documents to make important (one-way) decisions because we believe we make better decisions this way
• On average, we get together for a company-wide celebration ~once a week (larger feature release, big new closing, anniversary or birthday!)
• Kombo's Engineering Meme culture is legendary within the company:

Quality & Long-Term Velocity

We optimize for sustainable speed. That means making thoughtful trade-offs between shipping quickly today and protecting future velocity. We invest in strong fundamentals like testing, observability, sound API design, and security, and we treat AI as an accelerator, not a replacement for good engineering judgment.

Ownership End-to-End

Engineers at Kombo own their work from idea to production and beyond. A feature isn't "done" when the PR is merged, it's done when it runs reliably in production, delivers customer value, and is maintained over time. This includes rollout, monitoring, iteration, and follow-ups when things break.

Clarity & Written Thinking

We believe good decisions scale when they're written down. We document context, trade-offs, and intent in PRs, Notion docs, and code comments so others can understand not just what changed, but why. This helps us avoid hidden technical debt and move faster as a team.

If you enjoy high ownership, clear standards, and building systems that last — you'll feel at home at Kombo.

Overall, if joining an "SF company in Berlin" sounds appealing to you, then you should apply - even if you don't match all criteria