Full-Stack Engineer - Generative AI - Citi

eFinancialCareers; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

27 days annual leave

Discretional bonus

Private medical care & life insurance

Pension plan

Parental leave

Employee discounts

Job summary

Citi London is seeking a data-focused Full-Stack Engineer to help make Citi Assist smarter, safer and better. You will build systems behind testing, evaluation and feedback, turning real-world data into insights that improve AI quality and performance.

You’ll work across a stack—from React and data visualisation to backend services, APIs and data pipelines—owning features end-to-end and shaping the platform's technical direction. Hybrid work available.

Qualifications

• Experience building and deploying production full-stack applications.
• Proficiency in Python and TypeScript/JavaScript.
• Strong data engineering, analytics and problem-solving skills.
• Experience with modern frontend frameworks (React).
• Strong SQL and relational DB experience (Postgres).
• Experience with Kubernetes/OpenShift and containerised environments.
• Knowledge of CI/CD, automated testing and engineering best practices.
• Experience with data visualization, analytics or experimentation.
• Technical leadership and ownership with track record of delivering impact.
• Desirable: GenAI/LLM evaluation, AI safety, prompt engineering, data pipeline tools (Airflow/Dagster).

Responsibilities

• Build testing, evaluation and feedback platforms for GenAI products.
• Develop full-stack features using TypeScript, React and Python.
• Create scalable APIs, backend services and data pipelines.
• Design data models and frameworks to measure AI quality and performance.
• Create dashboards and visualisations from data.
• Analyse AI performance and identify quality improvements.
• Own features from concept to production.
• Influence architecture, direction and engineering standards.
• Build with security, resilience, and compliance in mind.
• Mentor engineers and raise engineering bar.

Skills

Full-stack engineering

Python

TypeScript/JavaScript

Data engineering

SQL/Postgres

CI/CD

AI/GenAI familiarity

Leadership

Testing/QA

Performance optimization

Tools

Kubernetes/OpenShift

PostgreSQL

Airflow

Dagster

Job description

Discover your future at Citi

Working at Citi is far more than just a job. A career with us means joining a team of approximately 219,000 dedicated people from around the globe. At Citi, you'll have the opportunity to grow your career, give back to your community and make a real impact.

Job Overview

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 ourGlobal Benefitspage 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.

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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.