Artificial Intelligence Engineer

🚀 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.