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Citi Logo Citi · IT - Software Development

Full Stack Lead Developer

United Kingdom, Belfast · Job Posted March 01, 2026
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Job Description

We are seeking an experienced and highly motivated Lead Full Stack Developer to join our dynamic engineering team. The ideal candidate will possess deep expertise in Java and ReactJS, coupled with a strong understanding of both relational (RDBMS) and NoSQL databases. This role is critical for driving the design, development, and deployment of robust, scalable, and high-performance applications. The Lead Developer will also play a key role in advocating for and implementing best practices in CI/CD application delivery and will have the opportunity to explore and integrate AI technologies into our solutions.

Job Responsibility

  • Lead the design, development, and implementation of complex enterprise-level applications using Java for backend services and ReactJS for intuitive and responsive front-end user interfaces
  • Architect and manage data storage solutions, demonstrating proficiency with relational databases (e.g. Oracle, MySQL) and NoSQL databases (e.g., MongoDB, Cassandra, DynamoDB). This includes schema design, query optimization, and data migration strategies
  • Drive continuous improvement in our CI/CD pipelines, ensuring efficient, automated, and reliable application delivery from development to production environments
  • Mentor and provide technical guidance to junior and mid-level developers, fostering a culture of collaboration, excellence, and continuous learning
  • Collaborate with product managers, UX/UI designers, and other stakeholders to translate business requirements into technical specifications and deliver innovative solutions
  • Conduct code reviews, ensuring adherence to coding standards, performance, security, and scalability best practices
  • Troubleshoot and resolve complex technical issues across the full application stack
  • Stay abreast of emerging technologies, industry trends, and best practices in full-stack development, database management, CI/CD, and Artificial Intelligence

Requirements

  • Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field
  • Professional experience in software development, with at least 3 years in a lead or senior full-stack role
  • Strong proficiency in Java development, including Spring Boot, Spring Framework, and related ecosystem
  • Expert-level skills in ReactJS and its core principles, along with experience in popular React workflows (such as Flux or Redux) and component libraries
  • Demonstrable experience with RDBMS (e.g., PostgreSQL, Oracle, MySQL), including advanced SQL, schema design, and performance tuning
  • Solid understanding and hands-on experience with NoSQL databases (e.g., MongoDB, Cassandra, DynamoDB), including data modeling and query optimization for these systems
  • Proven experience with CI/CD application delivery management, including tools like Jenkins, GitLab CI, GitHub Actions, Azure DevOps, or similar
  • Experience with cloud platforms (e.g., AWS, Azure, GCP) and containerization technologies (e.g., Docker, Kubernetes)
  • Excellent problem-solving, analytical, and communication skills
  • Ability to work effectively in an agile development environment

Nice to have

  • Exposure to Artificial Intelligence (AI) and Machine Learning (ML) concepts, frameworks (e.g., TensorFlow, PyTorch), or practical application of AI in software solutions
  • Experience with message brokers (e.g., Kafka, RabbitMQ) and microservices architecture
  • Familiarity with testing frameworks (e.g., JUnit, Mockito, Jest, React Testing Library)
  • Experience with GraphQL
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