Full Stack Engineer (Python/Js/MS Stack) Agentic AI Project
Salary
Annual
Full Stack Engineer (Python/JavaScript/MS Stack)Agentic AI & LLM Project
Location: Hybrid (London) and Remote Start: Jan 2026
The roleWe're hiring a hands-on Full Stack Engineer to build production-grade agentic AI solutions and LLM-powered applications. You'll design and deliver end-to-end features-from robust Back End APIs to polished Front End experiences-on Azure, with a strong emphasis on reliability, observability, and secure data handling.
What you'll do- Design & build scalable services in Python (FastAPI/Django/Flask) and front-ends in JavaScript/TypeScript (React/Next.js or similar).
- Develop agent workflows (planning, tool-use, memory) and LLM pipelines (prompt orchestration, retrieval, evaluation, guardrails).
- Productionise on Azure: Azure Functions/App Service, AKS or Container Apps, Azure Storage, Key Vault, Cosmos/SQL, ACR/Monitor, CI/CD (Azure DevOps or GitHub Actions).
- Ship quality: testing strategies for LLM features (golden sets, regression harnesses), performance tuning, telemetry, and incident playbooks.
- Collaborate with Product, Data/ML, and Security to deliver value safely and iteratively.
- Python for Back End services and tooling; JavaScript/TypeScript for modern Front End stacks.
- Azure experience deploying and operating cloud services (IaC with Bicep/Terraform is a plus).
- Agentic AI & LLMs: practical delivery of agents (eg, task planning, tool calling) and LLM apps (chat, summarisation, RAG, structured outputs).
- Engineering excellence: CI/CD, automated testing, code reviews, observability, and secure development practices.
- Experience with Azure OpenAI, OSS LLMs, model evaluation (BLEU/ROUGE/BERTScore, human-in-the-loop), and prompt/flow tooling.
- React/Next.js SSR/ISR, component libraries, and accessible UI.
- Work on real agentic AI use-cases moving from prototype to production.
- Autonomy to shape architecture and best practices for LLM delivery.
- Collaborative culture, modern tooling, and the chance to influence product direction.
GCS is acting as an Employment Business in relation to this vacancy.