Senior AI Engineer: Production-Grade Agent Architect

Citigroup Inc.; Greater London; Hybrid; GBP 110,000 - 150,000; Full time

Benefits offered by this job

27 days annual leave

Discretional annual bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Employee discounts

Job summary

Citigroup Inc. London is hiring a Senior Forward Deployed Engineer to build production‑grade agent reasoning loops and robust integrations with enterprise systems. You will advance MCP servers, implement resilient error handling, and ensure secure, scalable AI deployments in business squads.

The role emphasizes hands‑on engineering, collaboration in agile teams and guidance to junior developers, with a hybrid work model and a competitive package.

Qualifications

• Proven software engineering experience with Python.
• Hands-on with LLM APIs and integrating foundation models.
• Experience with REST/gRPC API development and CI/CD automation.
• Understanding of prompt engineering and JSON output validation.
• Ability to work in fast-paced agile squads solving ambiguous problems.

Responsibilities

• Writes production‑quality agent reasoning logic and memory management in Python.
• Develops MCP servers connecting AI agents to enterprise systems.
• Implements resilient error handling and HITL escalation triggers.
• Integrates safeguards for prompt injection defence and PII filtering.
• Collaborates with engineers to build regression testbeds and evaluation harnesses.
• Mentors junior developers and participates in code reviews.

Skills

Python

LLM APIs

JSON validation

Vector search

Agile teamwork

Collaboration

Tools

Docker

Git

Linux

CI/CD

REST APIs

gRPC

Job description

Citigroup Inc. London is hiring a Senior Forward Deployed Engineer to build production‑grade agent reasoning loops and robust integrations with enterprise systems. You will advance MCP servers, implement resilient error handling, and ensure secure, scalable AI deployments in business squads.

The role emphasizes hands‑on engineering, collaboration in agile teams and guidance to junior developers, with a hybrid work model and a competitive package.