Full-Stack Engineer (Generative AI)

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 productsDevelop full-stack features using TypeScript, React and PythonBuild scalable APIs, backend services and data pipelinesDesign data models and frameworks to measure AI quality and performanceCreate dashboards and visualisations that turn data into actionable insightsAnalyse AI performance and identify opportunities to improve qualityOwn features from concept and design through to productionInfluence architecture, technical direction and engineering standardsBuild with security, resilience, quality and regulatory compliance in mindMentor engineers, share knowledge and help raise the engineering bar Key Skills & Experience Strong experience building and deploying production full-stack applicationsExcellent Python and TypeScript/JavaScript skillsStrong data engineering, analytics and problem-solving experienceProven experience with modern frontend frameworks, ideally ReactStrong SQL and relational database experience, ideally PostgresExperience building scalable backend services and APIsExperience with Kubernetes/OpenShift and containerised environmentsStrong understanding of CI/CD, automated testing and engineering best practicesExperience with data visualisation, analytics or experimentationTechnical leadership, strong ownership and a track record of delivering impactDesirable: 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 bonusPrivate Medical Care & Life InsuranceEmployee Assistance ProgramPension PlanPaid Parental LeaveSpecial 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.