Founding Product Engineer

Who we areAxion Lab is an AI-native services firm turning high-end expert work for alternative asset managers from one-off consulting projects into a continuously available, software-native experience. Our platform combines AI with expert judgement in a tightly integrated process. AI handles the more deterministic parts of the work: data extraction, analysis, modelling, benchmarking and calculations, while sustainability experts focus on the judgement-heavy and inherently non-deterministic parts: selecting assumptions and methodologies, interpreting edge cases, challenging conclusions, and validating final outputs. From an engineering perspective, this means much more than wrapping an LLM: multi-step agent workflows, evals, quality gates, structured data and observability, built and iterated closely with clients and experts. Every engagement should make the system (and the knowledge embedded in it) better for the next one. We are early enough that the architecture, workflows and interaction model are still being invented, but far enough along to be building against real users (managing directors and partners of funds), real portfolio companies and private-market use cases. Our work already spans value creation, due diligence, decarbonisation, financing and sustainability reporting for portfolio companies across Europe and beyond. We are remote-first with occasional collaborative work weeks in Paris, Luxembourg or Amsterdam.

What You'll Do
As our first full-time engineer, you will be the technical owner of Axion Lab. You’ll define and evolve the architecture, infrastructure, testing, observability, security, CI/CD and engineering standards behind both our client-facing platform and the internal AI systems used to deliver live client work. A major part of the role is turning experimental AI workflows into reliable production systems: agent orchestration, evals, quality gates, structured data, traceability, expert review flows and operational reliability. You will also work closely with founders, sustainability experts and clients to understand real workflows, identify what should be automated or redesigned, and turn those insights into product. The principle behind the product is simple: internal complexity should translate into a radically simpler client experience. What We’re Looking ForEven if you don't tick all the boxes, but you like what you hear and want to work with us, please apply. Experience
• 5+ years of full-stack or backend software development experience.
• Experience deploying and maintaining production systems (infrastructure + CI/CD)
• Huge hands-on experience in LLM-based systems (agents, eval tooling, RAG workflows, etc.)
• Exposure to different architecture patterns and stacks Bonus points:
• Senior engineering experience in early-stage startups
• Prior exposure to enterprise-grade data quality, audit, or reporting systems used in regulated industries (finance, energy, insurance, etc.). Working Style
• Action-oriented: prototype
- ship
- validate
- iterate
• Product thinker: you care about real user problems, not just code elegance
• Pragmatic: able to balance technical ambition with delivery realities
• Strong communicator: especially in writing (async-friendly environment, bias for clear technical documentation) () Probably not a fit if you need highly defined requirements, want to manage rather than build, or prefer a predictable corporate environment. Why Join UsReal ownership: high-equity founding role with 4-year vesting, 6-month cliff Low politics, high autonomy: you’ll be the first tech hire joining 2 co-founders Get in the mix in Paris, Luxembourg and Amsterdam: run in-person product sprints, meet investors and stay close to the cutting edge (AI labs, founder friends, early adopters) We run a fast process, so you’ll hear back within 48 hours max after each step.