Python AI engineer in enterprise software

WTW; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

25 days holiday

Hybrid working

Private healthcare

Life insurance

Group income protection

Pension with company match up to 10%

Volunteer day

Share scheme

EV car scheme

Cycle-to-work

Dental cover

Optical cover

Critical illness protection

Job summary

WTW is seeking a Senior Python AI Engineer to build a modern, AI-enabled HR Expert application. You will craft AI-powered services, orchestration workflows and RAG pipelines, integrating with enterprise systems and Azure services.

You’ll contribute to scalable backend APIs with FastAPI, collaborate with architects and product owners, and help establish robust testing and observability for production-grade AI software.

Qualifications

• Strong Python development experience in production applications.
• Experience building APIs and backend services, ideally with FastAPI.
• Proven experience with LLMs, LangChain and LangGraph, and agentic workflows.
• Experience developing RAG solutions and integrating multiple systems via REST APIs.
• Solid testing, version control, CI/CD practices and production quality software.

Responsibilities

• Design, develop and maintain AI-powered application services using Python.
• Build and evolve agentic workflows and AI orchestration with LangGraph and LangChain.
• Develop scalable APIs and backend services using FastAPI.
• Design and implement RAG pipelines combining LLMs with enterprise data sources.
• Work on retrieval strategies including vector, metadata and graph-based retrieval.
• Contribute to architecture and implementation of complex AI workflows with multiple agents and data sources.
• Integrate AI services with the wider HR Expert application and enterprise systems.
• Develop and deploy solutions on Microsoft Azure across diverse data stores.
• Collaborate with architects, developers and product owners to turn requirements into robust solutions.
• Participate in design reviews, code reviews and engineering decisions.
• Help establish testing, observability and maintainability practices for AI apps.
• Investigate new AI technologies and assess practical value for the product.

Skills

Python

FastAPI

LangChain/LangGraph

LLMs

API design

CI/CD

Testing

Production software

Tools

Azure OpenAI

Docker

Kubernetes

Graph DB

ArangoDB

Job description

Описание:

Ready to build production AI that actually ships — not another proof-of-concept chatbot? Join us as a Senior Python AI Engineer on HR Expert, where you'll help design and build a modern, AI-enabled application from the inside out. This is a genuinely hands‑on engineering role at the cutting edge of generative AI, agentic systems and Retrieval‑Augmented Generation (RAG) — solving the hard, interesting problems around AI orchestration, information retrieval and grounding that most engineers only get to read about.

Задачи:

• Design, develop and maintain AI‑powered application services using Python.
• Build and evolve agentic workflows and AI orchestration using LangGraph and LangChain.
• Develop scalable APIs and backend services using FastAPI.
• Design and implement Retrieval‑Augmented Generation (RAG) pipelines that combine LLMs with enterprise knowledge and data sources.
• Work on retrieval strategies including vector, metadata and graph‑based retrieval.
• Contribute to the architecture and implementation of complex AI workflows involving multiple agents, tools and data sources.
• Integrate AI services with the wider HR Expert application and existing enterprise systems.
• Develop and deploy solutions using Microsoft Azure, working across relational, document, vector and graph‑based data stores.
• Collaborate with architects, developers, product owners and other technical specialists to turn requirements into robust technical solutions.
• Participate in technical design discussions, code reviews and engineering decision‑making.
• Help establish good engineering practices around testing, observability, performance and maintainability of AI applications.
• Investigate emerging AI technologies and evaluate where they can provide practical value to the product.
• Occasionally contribute to frontend or existing .NET services where needed — though this is not the primary focus of the role.

Требования:

• Strong Python development experience in production applications.
• Experience building APIs and backend services, ideally with FastAPI.
• Proven experience building applications with LLMs, using LangChain and/or LangGraph and agentic workflows.
• Experience developing RAG solutions and integrating multiple systems and data sources via REST APIs.
• Solid engineering practices — automated testing, source control, code review and CI/CD — with a focus on production‑quality software over prototypes.
• A good understanding of production generative AI challenges: retrieval quality, grounding, context management, evaluation, reliability and performance.
• Будет плюсом: Experience in any of the following would be particularly valuable: complex RAG architectures (multi‑stage retrieval, hybrid search, reranking, agent‑driven retrieval); graph databases and GraphRAG, particularly ArangoDB; Azure AI services (Azure OpenAI, AI Search, Cosmos DB, AKS, Functions); vector/semantic search; Docker and Kubernetes; multi‑tenant applications; LLM evaluation and observability; and Angular, NgRx or .NET / C# development

Условия:

• You’ll receive 25 days of annual leave plus an extra WTW day to relax and recharge.
• Our comprehensive health and wellbeing offering includes private healthcare, life insurance, group income protection, and regular health assessments, all giving you peace of mind.
• Secure your future with our defined contribution pension scheme, featuring matched contributions up to 10% from the company.
• We support your growth and balance with hybrid working options, access to an employee assistance programme, and a fully paid volunteer day to make a difference in your community.
• On top of these, you can opt into a variety of additional perks including an electric vehicle car scheme, share scheme, cycle‑to‑work programme, dental and optical cover, critical illness protection, and much more.