Junior Machine Learning Engineer (Fraud Detection)

Our engineering group is split into roughly 60 product teams, each owning its services end to end, with on-call shared across time zones. Annual releases gave way to two-week sprints years ago, and the platform now handles over 200 million API calls a day. Founded in 2006, we now have 300 employees.

Role overview

Celtic Technologies is hiring for the Junior Machine Learning Engineer (Fraud Detection) role to take models from notebook to production and keep them working once they're there. We're looking for an engineer to build retrieval-augmented generation features on hosted and open-weight language models, with proper evaluation. We work hybrid out of Cork, usually three days in, two days remote.

Essential duties and responsibilities

• Write clean, tested Python and review teammates' code.
• Build training pipelines in PyTorch or TensorFlow and run them on GPUs in AWS, GCP or Azure.
• Fine-tune open-weight models with LoRA when it beats prompting.
• Cut inference cost with quantization, batching and caching.
• Handle on-call for the ML services the team owns.
• Set up evaluation harnesses and regression tests for model quality.
• Document model cards, data sources and known failure modes.

Minimum qualifications

• 1+ years of software engineering experience, with at least two spent on ML systems in production.
• BS or MS in computer science, engineering or a related field.
• Familiarity with Docker, Kubernetes and a cloud ML platform (SageMaker, Vertex AI, Azure ML)
• Experience deploying models as services and monitoring them.
• Knowledge of LLM APIs, prompt design and evaluation methods.

Compensation: €74,000 - €88,000 per annum

Perks and benefits

• Health insurance for you and your family.
• Company pension scheme.
• 23 days annual leave plus bank holidays.
• Annual bonus.
• Hybrid working.
• Bike to work scheme.
• Pension contribution.

Interviews will be held in person at our Cork office.

Start: Immediately.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Celtic Technologies.