Full Stack Application Development Technical Lead (Java / Python), Vice President

Citibank (Switzerland) AG; Belfast City District; Hybrid; Confidential; Full time

Job summary

Citi Belfast is seeking a Senior Full-Stack Application Development Technical Lead (Java / Python) to design, build, and enhance backend services and Python components for enterprise-scale applications. Based in Belfast, this hybrid role requires hands-on leadership to deliver features end-to-end with global teams.

You will mentor developers, apply Agile practices, and integrate GenAI capabilities while ensuring security and resilience in a fast-paced financial services setting.

Qualifications

• Hands-on experience with Java (Spring Boot / Core); willing to ramp up Python
• Full-stack mindset with modern frontend frameworks (React/Angular)
• Experience delivering in Agile / Scrum with ownership
• Practical exposure to cloud-native architecture
• Awareness/integration of GenAI/LLMs into apps
• Strong communication and independent working style

Responsibilities

• Design, build, and enhance Java backend services and Python components for enterprise-scale applications
• Own end-to-end delivery from design to production rollout
• Collaborate with global tech and business teams to meet regulatory and transformation priorities
• Apply agile engineering practices with continuous improvement
• Integrate GenAI capabilities into real-world applications
• Mentor developers through code reviews and technical guidance
• Ensure applications meet Citi standards for security, stability, and control

Skills

Java

Python

Full-stack

Agile / Scrum

Cloud-native

GenAI / LLM

Mentoring

Tools

Spring Boot

React / Angular

Job description

## Full Stack Application Development Technical Lead (Java / Python), Vice PresidentApply: Hybrid: Belfast United Kingdom: Full time: Posted 3 Days Ago: End Date: October 2, 2026 (9 days left to apply): 26994336Are you looking for a career move that will put you at the heart of a global financial institution? Then bring your skills in analysis, application development, problem solving and communication to Source to Pay Solutions Technology group.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****Source to Pay Solutions Technology group is part of COO (**Citi Operating Office) **Technology** organization supporting Citi Operating Office business function and its enterprise‐wide transformation agenda to achieve improvements across **risk management, controls, data governance, AI adoption, and process re‐engineering** by delivering scalable, secure, and modern technology solutions. Based in **Belfast**, the team partners closely with businesses and technology stakeholders to **build, manage, and modernize multiple Source to Pay applications**, playing a key role in translating strategic transformation priorities into measurable operational outcomes.**What you’ll do****Application Development Technology Lead is a senior level position responsible for*** Design, build, and enhance Java based backend services and Python enabled components for enterprise scale applications* Own end‐to‐end delivery of features from design through production rollout* Collaborate with global technology and business teams to deliver against regulatory and transformation priorities* Apply agile engineering practices (iterative delivery, continuous improvement, pragmatic design decisions)* Integrate GenAI capabilities (LLMs, APIs, workflow automation) into real‐world applications where they add value* Mentor developers through code reviews, technical guidance, and hands‐on collaboration* Ensure applications meet Citi standards for security, stability, and control**What we’ll need from you*** Strong hands‐on experience with **Java** (Spring Boot / Core); working knowledge of **Python** or strong willingness to ramp up quickly* Full‐stack mindset with exposure to modern frontend frameworks (React, Angular, or similar)* Experience delivering in **Agile / Scrum environments** with a bias toward action and ownership* Practical exposure to **cloud‐native architecture** and scalable systems* Awareness or hands‐on experience integrating GenAI / LLM based capabilities into applications, with a focus on integration and usage rather than deep ML research* Strong communication skills and ability to work independently with minimal supervision**What we can offer you**This is a role that'll offer you the opportunity to build an in-depth knowledge of financial services and business services operations across the bank. Every day there will be new business challenges that will help you develop new skills that can drive your career.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, live well 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 resourcesAlongside 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 you need? Then apply to discover the true extent of your capabilities.**