Direct message the job poster from Russell Tobin

London – Hybrid (3 days onsite, 2 days WFH)

Contract until December 2025 – possible extension based on performance

We’re looking for an AI Research Engineer to join a world-leading social technology company known for building cutting-edge open-source large language models used by millions every day.

You’ll work on next-gen AI assistants — improving prompts, testing agent behavior, and fine-tuning performance — while diving deep into Python codebases and AI frameworks.

What you’ll do:

• Create, refine, and test prompts to guide AI agents toward ideal behavior
• Evaluate AI agent responses and identify failure points
• Implement and debug AI agent tool calls in a Python/PHP software stack
• Build and maintain internal benchmarks for AI agent performance
• Collaborate with researchers and engineers to improve LLM-powered agents
• Analyze results and report findings for model improvement initiatives

You bring:

• Strong Python skills (can read/write multi-file codebases)
• Working with LLM frameworks (LangChain, MCP)
• Experienced with Leetcode
• Experience with AI/ML, NLP, or generative AI research
• Curiosity, problem-solving mindset, and attention to detail

Tech Stack needed -

Languages: Python (Advanced, LeetCode-level), PHP (basic familiarity)

This is your chance to work on AI that’s shaping the future — at a scale few companies in the world can match.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Contract

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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