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Selected role

AI Engineer

Caseproof Kraków, ML, PL

Senior Full-time

Caseproof is the company behind MemberPress, the most widely used WordPress membership platform. We're privately held, profitable, and bootstrapped. We're building a new AI-powered product, and we're hiring the engineer who will own the AI substrate that powers it.

The Role

You'll own the AI core of a new product that will be used weekly by thousands of paying customers. Inference pipeline, retrieval, prompt versioning, eval suite, cost discipline, model-improvement loop... all of it.

This is a shipping role, not a research role. We're not training models or publishing papers. We're building a production system that has to be accurate, cheap to run, and steadily better month over month. You'll report to our senior engineering lead and work alongside a small, focused team.

What You'll Do

Design and run the inference pipeline. Retrieval-augmented generation with structured tool calls, citation-grounded responses, tier-aware model routing.
Own prompt versioning and the eval suite. Real evals, with adversarial cases and release-blocking gates. Vibes-based evals don't ship here.
Own cost telemetry and cost discipline. Per-user caps, model routing enforcement, caching, abuse detection. The product has a free tier; you're accountable for keeping it profitable at scale.
Build the feedback loop that makes the system improve over time.
Iterate on quality continuously based on real-customer signals.

What We Need

You have personally shipped at least one production LLM-powered product or feature that real users rely on. You can describe its prompts, evals, and cost telemetry in detail because you built them.
You've experienced and recovered from at least one of: prompt drift, model version regression, retrieval quality degradation, cost overrun, hallucination incident, eval-suite failure that blocked a release.
Strong full-stack engineering. Comfortable in Python or TypeScript, comfortable with Postgres and SQL, comfortable owning integrations end-to-end.
Vector store experience (pgvector, Pinecone, or equivalent).
Hands-on Anthropic API experience preferred; OpenAI API also fine.
You think about prompt drift, eval coverage, cost discipline, and feedback loops as engineering surfaces. Not afterthoughts.

What We Don't Need

Research scientists. We're not training models.
LangChain wrappers. We own our orchestration in-house.
Resumes heavy on AI buzzwords and light on shipped systems.

Compensation

Generous compensation & bonus structure. Health, dental, and vision for US employees. Remote-first with US-Mountain Time overlap preferred.

How to Apply

Send the following:

A short cover note (under 300 words) describing the most interesting LLM-powered system you've shipped, what was hard about it, and what you'd do differently next time.
A link to a portfolio piece, GitHub repo, or write-up that shows your work.
Resume.
Your expected compensation range and your earliest start date.

Process

We move fast — about 2–3 weeks end to end.

30-minute screen with the CEO.
60–90 minute technical conversation with the engineering lead. Walk us through one of your shipped LLM systems in depth.
Paid week-long trial project on a scoped problem.
Final conversation. Offer typically within 48 hours.

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