Staff AI Engineer — LLMs, Agents, Production

Dex; United Kingdom; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex is seeking a Staff AI Engineer to define the AI strategy and roadmap for a global tax automation platform. You will design and build backend services for AI workflows, from initial prototypes to production-ready systems, with end-to-end ownership across the product.

You will bring deep, hands-on experience with LLMs, prompt engineering, and agent frameworks, including production experience with RAG architectures, and you will build evaluation pipelines to ensure model accuracy and safety in

Qualifications

• 5+ years building customer-facing products with end-to-end ownership in a high-quality software environment.

Responsibilities

• Define the AI strategy and roadmap for the product.
• Design and build backend services for AI workflows from prototype to production.
• Develop and optimise prompt engineering strategies for complex tax scenarios.
• Build robust evaluation pipelines to ensure model accuracy, safety, and reliability.
• Architect and implement internal and customer-facing agent platforms.

Skills

LLMs

Prompt engineering

Agent frameworks

RAG architectures

Evaluation pipelines

Job description

Dex is seeking a Staff AI Engineer to define the AI strategy and roadmap for a global tax automation platform. You will design and build backend services for AI workflows, from initial prototypes to production-ready systems, with end-to-end ownership across the product.

You will bring deep, hands-on experience with LLMs, prompt engineering, and agent frameworks, including production experience with RAG architectures, and you will build evaluation pipelines to ensure model accuracy and safety in