Senior AI Frontend Engineer (Developer Productivity)

11037 Citibank, N.A. United Kingdom; Belfast; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A global financial institution in Belfast is seeking a Senior Frontend Engineer to lead the user-facing layer of their Developer Productivity platform. This role involves transforming AI capabilities into intuitive experiences, collaborating with a small, high-impact team. Candidates should have significant experience in React and TypeScript, along with proficiency in JavaScript and state management. The position offers a hybrid working model with competitive salary and benefits including 27 days of annual leave and performance-related bonuses.

Benefits

27 days of annual leave

Discretionary annual performance-related bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Special discounts for employees

Access to learning and development resources

Qualifications

• 5–10+ years building modern frontend applications with React and TypeScript.
• Proficiency in JavaScript, React (or another UI framework), and TypeScript.
• Experience with state management libraries for structured applications.

Responsibilities

• Own the user-facing layer of the Developer Productivity platform.
• Transform AI capabilities into intuitive experiences for engineers.
• Collaborate with AI and Software Engineers to enhance productivity.

Skills

React

TypeScript

JavaScript

State management libraries

Componentized development

Streaming and real-time experiences

Responsive design

Tools

Storybook

LangChain

Vercel AI SDK

Google ADK

Job description

Overview

We're seeking a Senior Frontend Engineer with a strong React/TypeScript background, passionate about crafting exceptional AI product experiences. You will own the user-facing layer of our next-generation Developer Productivity platform at Citi, transforming complex AI capabilities—from chat interfaces to rich data visualizations—into intuitive, trustworthy experiences. You will collaborate closely with AI, Software Engineers and the Product team to leverage bleeding-edge Generative AI. You will join a small, high-impact team challenging, changing, modernising and enhancing the experience of our 50,000 engineers globally throughout Citi's SDLC (Software Development Life Cycle).

Where you’ll work: You’ll sit within Development Enablement, part of Citi’s CTO organisation. A group focused on innovation, developer platforms and internal tools used across the bank, where we experiment and ship fast, like a startup inside a global bank. Our mission is to transform developer productivity, saving our engineers tens of minutes per day, equating to £10,000,000s of savings at Citi’s scale.

Your first 90 days

Your first 90 days – become a citizen within Developer Enablement's AI & UX

By the end of your third month, you will have:

• Released to production a small new or enhanced AI-first user interface that will positively impact thousands of Software Engineers and Business Analysts working in Software Requirements Engineering.
• Raised the bar in our codebase with better componentisation, testing, and Storybook usage.
• Established a network of UI engineers across the organisation to contribute and learn about best practices.
• Gained buy-in from the team on architectural principles, ways of working and system requirements. For example, you might separate core logic from the UI framework in the Generated by Stylus Workspaces Internal Use Only 2 UI; using Zustand as the data layer; and aim for the UI to respond to any action in under 100ms.

By the end of your first year

At this point, you will have an opinionated view on the specific challenges that AI-first UI design and engineering face, helping younger team members and other specialists understand how to collaborate to support high-standard UI engineering.

By the end of this first year, you will have:

• Owned and championed the implementation of best practices for interaction design within the team, establishing clear guidelines for AI-specific UX patterns.
• Mentored junior engineers on best practices for designing and implementing AI-driven user interfaces.
• Designed and implemented production-grade features for AI solutions.
• Contributed AI-specific UX expertise to solving problems that require AI expertise.
• Helped scope and plan future AI development work.
• Expanded our suite of evaluation metrics and techniques to simplify Agentic-AI development.
• Maintained consistent interactions with Engineering Leads across CTO to unblock shipping to prod.
• Represented Developer Enablement with regards to our AI-specific UX to stakeholders on multiple occasions.

What will you bring?

Here’s a list of what makes you a stronger fit to join our team:

• Strong expertise (5–10+ years) building modern frontend applications with React and TypeScript.
• Proficiency in JavaScript, React (or another UI framework), and TypeScript.
• Experience with state management libraries (Redux, Context API, Zustand) for building well-structured applications.
• Experience with Storybook or componentized development.
• Proficiency in implementing streaming and real-time experiences (e.g., word/token streaming, live updates, progress/status indicators).
• Strong understanding of frontend architectures, state management, performance optimization, and responsive design.
• Hands-on experience with tools like LangChain / LangGraph / Vercel AI SDK / Google ADK (Agent Development Kit).
• Familiarity with CI/CD tools (Jenkins, Tekton, ArgoCD, Harness, etc).

Tools and technologies you might use

• React, TypeScript, Storybook, internal design systems, LangChain, Vercel AI SDK, LangGraph, Google ADK (Agent Development Kit).
• Mac or PC – it’s up to you.
• Access to time-saving AI tools and resources.

What we’ll provide you

By joining Citi Belfast, you will be part of a business casual workplace with a hybrid working model (up to 2 days at home per week). You’ll receive a competitive base salary (annually reviewed) and enjoy a range of additional benefits such as:

• 27 days of annual leave (plus bank holidays)
• A discretionary annual performance-related bonus
• Private Medical Care & Life Insurance
• Employee Assistance Program
• Pension Plan
• Paid Parental Leave
• Special discounts for employees, family, and friends
• Access to an array of learning and development resources

Alongside these benefits, Citi is committed to ensuring our workplace is inclusive and welcoming for everyone. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.