Junior AI Engineer
Job description
Junior AI Engineer role on CENSUS's AI team, owning features in production AI systems and products and building, evaluating and shipping LLM-powered features on security data. Fully remote in Europe, with a path to grow into an AI Engineer role.
At a glance
- Employment
- Full-time
- Work mode
- Remote · Europe
- Languages
- English
What you'll do
- Design, build and ship LLM-based features, together with the evaluations that prove they work.
- Own work on retrieval (RAG), agent and tool-routing systems that answer questions over real security data.
- Build datasets and fine-tune open models on security data, and measure the result against a baseline.
- Scope your own tickets with your mentor and back every change with before-and-after results.
- Review your teammates' pull requests and help guide our interns.
What we're looking for
- At least 1 year of hands-on experience in AI, Machine Learning or Data Science engineering (internships count, as does industry or research-lab work).
- A track record of shipping: at least one ML or LLM feature that went into production or into a codebase other people used.
- Strong Python, with readable, tested code that others can review.
- Experience in a team codebase: Git, pull requests, and both giving and receiving code review.
- Practical experience building LLM applications (prompting, RAG or agents) and evaluating them, not only calling an API.
- A solid grasp of machine learning fundamentals, and the ability to design an experiment and read its results honestly.
- Working knowledge of SQL and Docker.
- The ability to work independently on a well-scoped ticket and to say early when you are stuck.
- Good written English (non-English resumes will be rejected), and the habit of backing claims with evidence.
- Open to graduates (Bachelor's, Master's or PhD) in Computer Science, AI, Machine Learning, Data Science or related fields, or candidates with equivalent practical experience, with at least 1 year of hands-on experience, internships included.
Nice to have
- Fine-tuning LLMs (LoRA, SFT, DPO) or building evaluation sets.
- GPU training or model-serving experience (e.g. vLLM).
- Vector databases, cloud or Kubernetes experience.
- Published papers or research experience.
- Interest in security or cryptography (we will teach you the domain).
Benefits
Real Ownership: own features in production AI systems end to end, from data and a first measurement through evaluation, deployment and iteration.
- Elite Team: work alongside world-class AI and cybersecurity experts.
- Hands-on AI: high-impact work across LLM features, RAG and agent systems, evaluations, datasets, and fine-tuning.
- Mentorship: a named AI-team mentor for your first months, and code review on every pull request.
- Remote Work Model: fully remote in Europe.
- Growth: a clear path to AI Engineer as you take on larger, less defined work.
Apply
About CENSUS SA
Cybersecurity Engineering
CENSUS is a globally recognized cybersecurity firm delivering top-tier IT and OT security solutions. We work with Fortune 500 companies, financial institutions, critical infrastructure, and secure communications providers worldwide. Our expertise spans cutting-edge research, scientific analysis, and deep engineering experience, ensuring unmatched security for products, infrastructure, and organizations.
Key facts
- Cybersecurity
- Globally recognized cybersecurity firm delivering IT and OT security solutions
- Works with Fortune 500 companies, financial institutions, critical infrastructure, and secure communications providers worldwide
- Expertise spans cutting-edge research, scientific analysis, and deep engineering experience