AI Full-Stack Engineer: Multi-Agent Systems & LLMs

Randstad Technologies; City Of London; On-site; GBP 268,000 - 358,000; Full time

Job summary

Randstad Technologies seeks an AI Full Stack Engineer (AI & ML Engineer) in London for a 9-week engagement starting Oct 12, 2026. The role emphasizes building multi-agent workflows, prompt engineering, and secure Python API development, with a strong focus on LLM integration and observability.

You will work in a fast-paced environment using Gemini, OpenAI, Claude, LangChain, and OpenSearch, across cloud platforms. Expect 40 hours per week with a daily rate in a PAYE/umbrella setup.

Responsibilities

• Agentic Systems: Build multi-agent, stateful, and asynchronous workflows.
• LLM Management: Handle prompt engineering, context/memory management, hallucination controls, guardrails, and fallback logic.
• Observability: Implement tracing and evaluation frameworks, specifically utilizing LLM-as-a-Judge patterns.
• Backend Engineering: Develop secure Python APIs and maintain strong testing and deployment disciplines.

Skills

Python

RESTful API development

JSON Schema

Pydantic

Tools

Google ADK

LangChain

LangGraph

OpenAI

Gemini

Claude

AWS OpenSearch

Job description

Randstad Technologies seeks an AI Full Stack Engineer (AI & ML Engineer) in London for a 9-week engagement starting Oct 12, 2026. The role emphasizes building multi-agent workflows, prompt engineering, and secure Python API development, with a strong focus on LLM integration and observability.

You will work in a fast-paced environment using Gemini, OpenAI, Claude, LangChain, and OpenSearch, across cloud platforms. Expect 40 hours per week with a daily rate in a PAYE/umbrella setup.