Senior AI Agent Developer

Foster + Partners; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Private medical insurance

Life assurance

Personal travel insurance

Wellbeing support

Retailer discounts

On-site catering

Social events

Career development

Job summary

Foster + Partners in London seeks a Senior AI Agent Developer to shape AI-enabled tools for the built environment. You will join the Applied R+D team and build production-grade AI agents that connect with design and business systems such as Revit and Rhino/Grasshopper.

Work with architects, engineers and digital innovation experts to evolve the AI platform strategy, define enterprise standards, and deliver innovative solutions that transform the practice’s workflows.

Qualifications

• Degree in CS or equivalent professional experience.
• Experience integrating with APIs or plugin SDKs.
• Proficient in TypeScript/Node.js or C#/.NET.
• Production experience with LLM agents and tool calling.
• Knowledge of MCP servers and the Model Context Protocol.
• Familiar with OAuth 2.0/OIDC and AI security considerations.
• Experience with observability and monitoring of AI systems.

Responsibilities

• Develop production‑grade AI agents and integrations with design and business systems.
• Collaborate with developers and domain experts to deliver AI solutions.
• Define standards and evaluation frameworks for enterprise AI.
• Contribute to a shared AI platform used across the practice.

Skills

LLM agent development

APIs & plugin SDKs

OAuth 2.0 / OIDC security

Observability & monitoring

Model Context Protocol

Security best practices

Education

Degree in Computer Science or equivalent

Tools

TypeScript/Node.js

C#/.NET

Job description

Senior AI Agent Developer

Department: Applied R+D

Employment Type: Permanent - Full Time

Location: London

Reporting To: Martha Tsigkari

Description

As a Senior AI Agent Developer at Foster + Partners, you will help shape the next generation of AI-enabled tools for the built environment. Working within the Applied Research + Development team and reporting to the Head of Applied Research and Development, you will develop production-grade AI agents and integrations that connect with design and business systems, including Revit and Rhino/Grasshopper. This is a hands‑on opportunity to influence our AI platform strategy, collaborate with developers and domain experts, and deliver innovative solutions that support digital transformation across the practice.

This role is ideal if you want to:

• Build AI agents and tool integrations that operate within complex design and business applications.
• Develop production workflows using Microsoft 365 Copilot, Copilot Studio and emerging agent technologies.
• Work alongside experts in architecture, engineering and digital innovation to solve challenging real‑world problems.
• Define standards, processes and evaluation frameworks for enterprise AI solutions.
• Contribute to the growth of a shared AI platform that supports teams across the practice.

What you will bring to the team:

• A degree in Computer Science, Computational Design or equivalent professional experience.
• Experience integrating with complex desktop or enterprise software through APIs or plugin SDKs.
• Strong programming capability in TypeScript/Node.js or C#/.NET, with the confidence to work across both environments.
• Production experience building LLM agents that perform real actions through tool calling, orchestration and error recovery.
• Experience developing MCP servers or equivalent agent tool integrations and familiarity with the Model Context Protocol.
• Knowledge of automated evaluation, observability and monitoring practices for AI systems, including trace and metric analysis.
• An understanding of OAuth 2.0/OIDC, AI security considerations and the importance of handling confidential information responsibly.

What we offer:

• private medical insurance for you and your family
• life assurance
• personal travel insurance
• access to a range of wellbeing support, comprising virtual GP services, mental health support and lifestyle coaching
• discount programmes for various retailers
• On our London campus, we have subsidised catering facilities and host regular social events, and sports activities, for everyone to enjoy.
• To support you in building a meaningful career, the practice offers opportunities to develop both your technical and non-technical skills through continuous learning, professional development support, and knowledge sharing and insights from experienced colleagues.

If our designs spark your curiosity and you would like to contribute to solving complex challenges with local and global impact, we invite you to join our team. You’ll be challenged and inspired, collaborating on extraordinary projects in an environment designed to cultivate excellence.