Python AI Engineer

Square One Resources Limited; London; Hybrid; NOK 1,412,000 - 1,648,000; Full time

Job summary

Square One Resources Limited in London is seeking a Python AI Engineer to develop production-grade Python services for Generative AI and complex RAG solutions. You will handle AI workflows, information retrieval, and evidence processing with LLM integration and validation, delivering robust production capabilities.

The role focuses on building multi-step, agentic AI applications with strong testing, logging and observability. This contract runs for 6 months with a hybrid London work model.

Qualifications

• Strong commercial experience developing production-grade Python applications and services.
• Advanced Python skills including asynchronous programming, type annotations, modular design and performance optimisation.
• Hands-on experience with Pydantic, LangGraph, MS Agent Framework/Semantic Kernel or similar AI orchestration frameworks.
• Demonstrable experience delivering Generative AI and RAG solutions beyond proof of concept.
• Strong understanding of embeddings, vector search, lexical search, hybrid retrieval, chunking, reranking and evidence selection.
• Experience integrating LLMs using structured outputs, tool calling, prompt/model versioning, token management and response validation.
• Experience building multi-step, agentic or workflow-based AI applications.
• Strong automated testing experience using Pytest or equivalent.
• Experience with APIs, distributed services, Git, CI/CD, containers and production observability.

Responsibilities

• Design, develop and maintain production-grade Python services for Generative AI and RAG solutions.
• Build and integrate LLM workflows using structured outputs, tool calling, schema validation and controlled fallbacks.
• Implement vector, lexical and hybrid retrieval, metadata filtering, reranking and evidence selection.
• Build asynchronous services with appropriate timeout, retry, cancellation and exception handling.
• Develop automated unit, integration, regression and failure-path tests.
• Implement structured logging, tracing and operational monitoring.
• Monitor and optimise response quality, latency, token usage, cost and performance.
• Contribute to technical design, code reviews, engineering standards and production support.

Skills

Python

Async programming

Type hints

Modular design

Performance optimization

LangGraph

Pydantic

LLM integration

Vector search

Retrieval

Pytest

APIs

Tools

Docker

Kubernetes

Git

CI/CD

Semantic Kernel

Job description

Python AI Engineer

London - Hybrid

Rate: £600 - £700 Per day - Inside IR35

Start: Mid October

Contract - 6 Months

Python AI Engineer required to develop production-grade Python services for Generative AI and complex RAG solutions. You will work across AI workflow orchestration, information retrieval, evidence processing, LLM integration, response generation and validation..This role requires strong production Python experience and practical experience delivering Generative AI and RAG solutions beyond proof of concept.

Job Responsibilities/Objectives:

• Design, develop and maintain production-grade Python services for Generative AI and RAG solutions.

• Build and integrate LLM workflows using structured outputs, tool calling, schema validation and controlled fallbacks.

• Implement vector, lexical and hybrid retrieval, metadata filtering, reranking and evidence selection.

• Build asynchronous services with appropriate timeout, retry, cancellation and exception handling.

• Develop automated unit, integration, regression and failure-path tests.

• Implement structured logging, tracing and operational monitoring.

• Monitor and optimise response quality, latency, token usage, cost and performance.

• Contribute to technical design, code reviews, engineering standards and production support.

Required Skills/Experience:

• Strong commercial experience developing production-grade Python applications and services.

• Advanced Python skills, including asynchronous programming, type annotations, modular design and performance optimisation.

• Hands-on experience with Pydantic, LangGraph, MS Agent Framework/Semantic Kernel or similar AI orchestration frameworks.

• Demonstrable experience delivering Generative AI and RAG solutions beyond proof of concept.

• Strong understanding of embeddings, vector search, lexical search, hybrid retrieval, chunking, reranking and evidence selection.

• Experience integrating LLMs using structured outputs, tool calling, prompt/model versioning, token management and response validation.

• Experience building multi-step, agentic or workflow-based AI applications.

• Strong automated testing experience using Pytest or equivalent.

• Experience with APIs, distributed services, Git, CI/CD, containers and production observability.

Technical Skillset:

• Azure OpenAI, Azure AI Search or equivalent AI and enterprise search platforms.

• Pydantic AI, LangGraph, Semantic Kernel or similar orchestration frameworks.

• LLM and RAG evaluation approaches, with Azure Foundry or ML Studio preferred.

• Docker, Kubernetes, telemetry and load testing.

Disclaimer

Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.

Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.