Senior Research Engineer, Large-Scale Search & Data Systems

Mistral Ai; Paris; On-site; EUR 90,000 - 140,000; Full time

Benefits offered by this job

Healthcare coverage

Relocation support

Wellness programs

Meal and transportation allowances

Job summary

Mistral AI in Paris, France is seeking a Research Engineer to join the Search and Services Platform within Research Platform. You will build and operate large-scale search services, knowledge graphs and data pipelines to support model development and training.

You will work with researchers and data teams to ensure reliability, scalability and fast performance across terabytes of data and thousands of CPU cores, in a fast-paced startup environment.

Qualifications

• 5+ years of experience in search engineering, data infrastructure or similar platform roles.
• Proficiency in Python or Go and strong software development practices.
• Hands-on experience with large-scale search or data systems (Vespa, Elasticsearch/OpenSearch).
• Exposure to site reliability engineering: incident response, on-call rotations, RCA.
• Exposure to infrastructure management: containers, Kubernetes, infra-as-code, observability.
• Ability to design and operate data pipelines for very large datasets.
• Excellent problem-solving and communication, strong ownership and team spirit.

Responsibilities

• Design, build and operate large-scale search infrastructure (self-hosted Vespa, managed indexes).
• Self-host and maintain diverse data sources: knowledge graphs, scholarly data, statistical databases.
• Design interfaces and tools to expose services to models and agents.
• Build data pipelines to ingest, index and serve massive datasets.
• Collaborate with researchers and adjacent teams to enable workflows and adoption.
• Produce documentation to help teams use the services effectively.

Skills

Python

Go

SRE

Kubernetes

Elasticsearch/OpenSearch

Tools

Vespa

Elasticsearch

OpenSearch

ClickHouse

MCP

Job description

Mistral AI in Paris, France is seeking a Research Engineer to join the Search and Services Platform within Research Platform. You will build and operate large-scale search services, knowledge graphs and data pipelines to support model development and training.

You will work with researchers and data teams to ensure reliability, scalability and fast performance across terabytes of data and thousands of CPU cores, in a fast-paced startup environment.