Machine Learning Engineer PyTorch LLM
Role details
Job location
Tech stack
Job description
As an AI Engineer, you'll work across backend systems, evaluation frameworks, and agentic LLM workflows to create scalable, secure, and continuously improving AI features. You'll partner closely with design, product, and legal teams to bring thoughtful, high-impact functionality to life.
What you'll do
Build and integrate LLM-powered features in production.
Define success metrics (task success, grounding, latency, cost) and set practical SLOs.
Create and maintain evaluation datasets: golden sets, adversarial cases, and regression suites.
Automate quality checks with an offline eval harness, CI gates, and safe online tests (A/B, canaries).
Instrument tracing and logs for prompts, responses, errors, and costs; analyze failures and ship fixes.
Improve quality end-to-end: prompt design, retrieval (RAG), model selection/fine-tuning, and post-processing.
Work across APIs, data pipelines, and backend services to deliver complete user workflows.
Collaborate with product and design so the AI feels helpful and trustworthy.
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Requirements
4+ years building user-facing software (B2B SaaS is a plus).
Strong Python skills and comfort with at least one other backend language.
Production experience building with LLMs or similar AI services.
Solid understanding of APIs, cloud infrastructure, and scalable backend design.
Proven loop for improving model quality:
Building/maintaining eval datasets and regression suites
Running offline evals and online experiments, interpreting results
Benefits & conditions
Product sense and curiosity-you think in terms of user outcomes, not just code paths.
What you can expect
A high-trust, high-impact environment with ownership over mission-critical AI systems
Challenging product problems at the intersection of law, language, and intelligence
A collaborative team of engineers, designers, and legal experts building something new
Competitive salary, meaningful equity, and a say in shaping both product and culture
If you're looking for more than just a job - a place to learn, grow, and have a real impact from day one - this could be the one. We're building something exciting, and we're looking for people who want to be part of the journey. If that sounds like you, hit apply., £100,000
Machine Learning Engineer (PyTorch LLM) London onsite to £110k Do you have expertise with Machine Learning in production? You could be progressing your career at a London based tech start-up with £5 million in recent pre-seed funding, in an impactful role that you'll...
