Senior Application Development Lead – Generative AI (Gen AI), Vice President

Senior Application Development Lead – Generative AI (GenAI) 
 

Are you looking for a career move that will put you at the heart of a global financial institution? Then bring your skills inanalysis,applicationdevelopment,problem solving and communication toSourceto PaySolutionsTechnologygroup. 

By Joining Citi, you will become part of a global organisation whose mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. 

Team/Role Overview 

Sourceto PaySolutionsTechnology group is part ofCOO(Citi Operating Office)TechnologyorganizationsupportingCiti Operating Officebusiness functionand itsenterprise‑wide transformation agenda toachieveimprovements acrossrisk management, controls, data governance, AI adoption, and processre‑engineering by delivering scalable, secure, and modern technology solutions. Based inBelfast, the team partners closely with businesses and technology stakeholders tobuild, manage, and modernize multipleSource to Payapplications, playing a key role in translating strategic transformation priorities into measurable operational outcomes. 

Whatyou’ll do 

• Senior Application Development Lead(GenAI)is a senior level position responsible for 

• Set technical direction for GenAI adoption across multiple applications or teams, defining reusable patterns, reference architectures, and best practices aligned with enterprise standards.  

• Design, integrate, and evolve GenAI capabilities (LLMs, APIs, agentic workflows, automation) inbusiness‑critical applications, focusing on clear value, reliability, and responsible usage 

• Ownend‑to‑end delivery of GenAIenabled features, from solution design and implementation through production rollout, support, and continuous improvement 

• Collaborate daily with global and regional technology and business teams to deliver against regulatory, risk, and transformation priorities 

• Apply agile engineering practices,leveraging iterative delivery, pragmatic architectural decisions, and emerging GenAI/agentic tooling to accelerate outcomes 

• Provide technical leadership and mentorship throughhands‑on development, code reviews, and design guidance, raising the overall engineering bar 

• Ensure solutions meet Citi standards for security, stability, resilience, and operational control, working closely with architecture, risk, and production support teams 

• Continuously assess and improve system quality, balancing performance, cost, accuracy, and user experience in production GenAI applications 

Whatwe’ll need from you 

• Deepexpertise in Large Language Models (LLMs), including commercial and open-source models (e.g., OpenAI, Gemini, Claude, Llama), and selecting the right model for usecase, cost, and performance constraints 

• Hands‑on experience building GenAI applications using modern frameworks such asLangChain,LangGraph,LlamaIndex, and Hugging Face, including agentic andmulti‑step workflows 

• Proven experience designing and implementingRetrieval‑Augmented Generation (RAG) systems, including vector databases (pgvector, Pinecone,Weaviate, FAISS, etc.) and advanced retrieval strategies (hybrid search,re‑ranking, metadata filtering) 

• Strong understanding of prompt engineering, workflow design, andGen‑AI optimization, balancing latency, cost, quality, and accuracytrade‑offs in production systems 

• Solid grounding in ML/DL concepts, withhands‑on experience applying frameworks such asPyTorch and/or TensorFlow, including embeddings and modelfine‑tuning where appropriate 

• Experience deploying and operating production GenAI systems,leveragingDocker,cloud‑native architecture, production APIs, and monitoring/observability tools, with an emphasis on reliability and scalability 

• Stronghands‑on software engineering skills, includingPython,FastAPI, async programming patterns, and buildinghigh‑performanceAI‑powered APIs 

• Understanding of AI system evaluation, safety, and governance, including hallucination handling, guardrails, feedback loops, and responsible AI considerations, combined with the ability to work independently and communicate effectively in agile environments 

What we can offer you 

This role offers the opportunity to shape how Generative AI is responsibly adopted across critical enterprise workflows, influencing both technology strategy and business outcomes.You’ll work at the intersection of platform engineering, AI governance, andlarge‑scale transformation, with clear visibility and impact across the organization.  

We work hard to have a positive financial and social impact on the communities we serve. In turn, we put our employees first and provide the best-in-class benefits they need to be well, livewell and save well. 

By joining Citi Belfast, 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:  

• Generous holiday allowance starting at 27 days plus bank holidays; increasing with tenure 

• A discretional annual performance related bonus  

• Private medical insurance packages to suit your personal circumstances 

• 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 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.  

Sounds like Citi has everything youneed? Then apply to discover the true extent of your capabilities.  

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