Applied AI Engineer, Client-Facing & Production

Addepar1; Greater London; On-site; GBP 110,000 - 140,000; Full time

Job summary

Addepar is seeking an Applied AI Engineer to join the London team, embedding with strategic clients to identify valuable AI opportunities and ship capabilities.You will prototype, prove, and partner with core engineers to release features for all customers, designing agent behavior and tool integrations from idea to production.

You’ll work closely with clients to understand workflows, validate AI behavior, and iterate toward production quality, with occasional travel to client sites.

Qualifications

• Extensive professional software engineering experience.
• Experience with Python as the team’s primary language.
• Experience with LLM APIs (Claude, GPT, or similar) including function calling and structured outputs.
• Comfort with SQL for data exploration and building data-grounded AI workflows.
• Familiarity with AI-assisted development tools (Claude Code, Codex, or similar).
• BS/MS in Computer Science, Mathematics, or another quantitative field, or equivalent experience.

Responsibilities

• Build AI-powered agents and tools end-to-end: identify client problems, prototype quickly, evaluate rigorously, and ship to production.
• Design and implement LLM integrations including prompt engineering, function calling, structured outputs, and retrieval-augmented workflows.
• Define evaluation criteria and build test harnesses for AI systems where correctness is ambiguous and domain-specific.
• Work directly with clients to understand their workflows, validate AI behavior, and iterate toward production quality.
• Partner with core engineering teams to generalize client-specific work into product features.
• Contribute to shared AI infrastructure (agent frameworks, tool integrations, deployment pipelines).
• Monitor and maintain production AI systems with attention to reliability, cost, and performance.

Skills

Python

LLM APIs

Function calling

SQL

AI tooling

Production software engineering

Education

BS/MS in Computer Science or quantitative field

Tools

Claude Code

Codex

Job description

Addepar is seeking an Applied AI Engineer to join the London team, embedding with strategic clients to identify valuable AI opportunities and ship capabilities.You will prototype, prove, and partner with core engineers to release features for all customers, designing agent behavior and tool integrations from idea to production.

You’ll work closely with clients to understand workflows, validate AI behavior, and iterate toward production quality, with occasional travel to client sites.