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Artificial Intelligence Engineer

Russell Tobin
City of London
1 week ago
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🚀 AI Research Engineer – LLMs & AI Agents

📍 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)

Databases: SQL (basic–intermediate querying & analysis)

AI/LLM Frameworks: LangChain, Model Context Protocol (MCP)

Tools: Git / source control

Concepts: Large Language Models (LLMs), prompt engineering, AI agent development


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

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