Data Software Engineer for AI Systems — London

Owen Thomas B Corp; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Mistral AI, based in London, is seeking a Forward Software Engineer, Data to build end-to-end AI systems, data pipelines, and scalable architectures for enterprise use. You will own end-to-end delivery from prototype to production and work with customer-facing teams to deploy robust ML-enabled solutions.

The role emphasizes data governance, quality, and fast iteration, with collaboration across Europe, North America, and beyond.

Qualifications

• You have full-stack software engineering experience and can ship across the stack.
• You have 5+ years building data-intensive pipelines with distributed processing.
• You have experience with retrieval-augmented generation or LLM evaluation.
• You work autonomously and own the outcome.
• You communicate clearly in English to technical and non-technical audiences.
• You ship in increments and balance product-technical tradeoffs.

Responsibilities

• Build AI systems end to end from prototype to production.
• Design data architecture: ingestion, processing, storage, and data models.
• Build distributed pipelines for documents, code, logs, and multimodal data.
• Turn customer problems into reusable patterns and platforms.
• Ensure systems meet throughput, latency, cost and reliability goals.
• Embed data governance: ownership, access, lineage, retention, privacy.
• Create evaluation loops with LLMs, human labeling, and verifications.
• Set the team’s data system design and shipping standards.
• Collaborate with researchers, engineers, and customer teams.

Skills

NodeJS

NextJS

Express

Fastify

Python

FastAPI

TypeScript

React

Distributed data pipelines

Spark

Airflow

Dagster

Prefect

RAG

LLM evaluation

Autonomous work style

English communication

Incremental delivery

Neo4j

CI/CD

Infrastructure as Code

Tools

Neo4j

CI/CD

Infrastructure as Code

Job description

Mistral AI, based in London, is seeking a Forward Software Engineer, Data to build end-to-end AI systems, data pipelines, and scalable architectures for enterprise use. You will own end-to-end delivery from prototype to production and work with customer-facing teams to deploy robust ML-enabled solutions.

The role emphasizes data governance, quality, and fast iteration, with collaboration across Europe, North America, and beyond.