Full-Stack Engineer – Generative AI

Citigroup Inc.; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

27 days leave

Discretionary bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Employee discounts

Job summary

Citi’s GenAI Common Platform Engineering team is building Citi Assist, a Generative AI assistant powering Citi colleagues globally. We’re hiring a data-focused Full-Stack Engineer to enhance testing, evaluation and feedback capabilities across the stack, from React front-ends to Python back-end services and data pipelines.

You will own features end-to-end, influence architecture, ensure security and compliance, and help shape the platform’s technical direction with ownership and pace.

Qualifications

• Experience building and deploying production full-stack applications.
• Strong Python and TypeScript/JavaScript skills.
• Experience with data engineering, analytics or experimentation.

Responsibilities

• Build testing, evaluation and feedback platforms for GenAI products.
• Develop full-stack features using TypeScript, React and Python.
• Build scalable APIs, backend services and data pipelines.
• Design data models to measure AI quality and performance.
• Create dashboards and visualisations that turn data into insights.
• Mentor engineers and help raise engineering standards.

Skills

Full-stack engineering

Python

TypeScript/JavaScript

React

Data engineering

CI/CD & testing

Ownership & leadership

Tools

Kubernetes/OpenShift

PostgreSQL

Airflow

Dagster

Job description

About the Team

Join Citi’s GenAI Common Platform Engineering team and help build the technology powering Citi Assist — a Generative AI assistant designed to transform how hundreds of thousands of Citi colleagues work.

We’re building from the ground up, combining the scale and reach of a global bank with the mindset and pace of a technology start-up. You’ll work alongside talented engineers and AI specialists, with genuine ownership and the opportunity to shape how Citi builds and adopts GenAI safely and at scale.

The Role

We’re looking for a data-focused Full-Stack Engineer to help make Citi Assist smarter, safer and better every day.

You’ll build the systems behind testing, evaluation and feedback — turning real-world data into insights that improve the quality and performance of our AI products.

You’ll work across the stack, from React and data visualisation to backend services, APIs and data pipelines, owning features end-to-end and helping shape the technical direction of the platform.

This is a role for an engineer who enjoys solving complex problems, moves with pace, takes ownership and wants to have a genuine impact on how AI is built and used at scale.

Key Responsibilities

• Build testing, evaluation and feedback platforms for GenAI products
• Develop full-stack features using TypeScript, React and Python
• Build scalable APIs, backend services and data pipelines
• Design data models and frameworks to measure AI quality and performance
• Create dashboards and visualisations that turn data into actionable insights
• Analyse AI performance and identify opportunities to improve quality
• Own features from concept and design through to production
• Influence architecture, technical direction and engineering standards
• Build with security, resilience, quality and regulatory compliance in mind
• Mentor engineers, share knowledge and help raise the engineering bar

Key Skills & Experience

• Strong experience building and deploying production full-stack applications
• Excellent Python and TypeScript/JavaScript skills
• Strong data engineering, analytics and problem-solving experience
• Proven experience with modern frontend frameworks, ideally React
• Strong SQL and relational database experience, ideally Postgres
• Experience building scalable backend services and APIs
• Experience with Kubernetes/OpenShift and containerised environments
• Strong understanding of CI/CD, automated testing and engineering best practices
• Experience with data visualisation, analytics or experimentation
• Technical leadership, strong ownership and a track record of delivering impact
• Desirable: Experience with GenAI/LLM evaluation, AI safety, prompt engineering, experimentation frameworks or data pipeline technologies such as Airflow or Dagster.

What we’ll provide you

This is a unique role that will put you in the position to be part of a new venture and actively drive change. Every day there will be new challenges that will help you develop new skills that can drive your career.

By joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:

• 27 days annual leave (plus bank holidays)
• A discretional annual performance related bonus
• Private Medical Care & Life Insurance
• Employee Assistance Program
• Pension Plan
• Paid Parental Leave
• Special discounts for employees, family, and friends

Visit our Global Benefits page to learn more.

Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.

Job Family Group:

Technology

Job Family:

Applications Development

Time Type:

Full time

Most Relevant Skills

Please see the requirements listed above.

Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.