Technical Business Analyst - Core Banking Guernsey

The Technical Business Analyst role will be based on-site in Guernsey and will support the core banking transformation, new product launches, regulatory change, and integration with payments, digital channels, and downstream systems. Business & Domain Analysis

Elicit, analyse, and document business requirements related to core banking domains. Translate regulatory, operational, and product requirements into clear functional specifications. Act as a subject matter expert on banking processes, product behaviour, and lifecycle events. Technical Analysis & Solution Design

Convert business requirements into detailed technical requirements, including: o API contracts (REST/JSON, event schemas)

o Data models and mappings

o Integration flows and sequencing

Work closely with solution architects to: o Validate architectural decisions

o Ensure alignment with target-state core banking architecture

Support design of integrations between: o Core banking systems

o Payment engines

o Digital channels and middleware

o Data platforms and regulatory reporting systems

Delivery & Agile Collaboration

Collaborate with Product Owners to refine epics, features, and user stories. Write clear, testable user stories with acceptance criteria that reflect both business and technical needs. Support sprint ceremonies (backlog refinement, sprint planning, demos). Clarify requirements for development teams during implementation and testing phases Data & Migration Support Support data migration and data quality activities, including: o Legacy-to-target data mapping

o Validation rules

o Reconciliation logic

Assist with defining cutover and transition requirements during core banking migrations. Testing & Validation

Define functional and integration test scenarios. Support SIT, UAT, and operational readiness testing. Validate that delivered solutions meet: Business requirements Regulatory obligations Non-functional requirements (performance, resilience, auditability) Stakeholder & Vendor Engagement

Act as a key interface between: o Business users

o IT and engineering teams

o External vendors (core banking providers, payment processors, system integrators)

Challenge vendor solutions constructively to ensure fit-for-purpose outcomes. Documentation, Knowledge Transfer & Operational Handover Ensure concise, accurate documentation describing system behaviour, integrations, data impacts, and key business rules. Conduct clear walkthroughs and knowledge transfer sessions with Technical Operations and Application Support teams. Support effective handover to BAU, ensuring support teams understand processing flows, dependencies, and common exception scenarios. Core Skills and Knowledge: Banking & Financial Services Experience

10 to 15 years' or more experience as a Business Analyst or Technical Business Analyst in financial services. Strong hands-on experience with core banking platforms (e.g., Temenos, Mambu, Thought Machine, Finacle, TCS BaNCS, Flexcube, or equivalent). Solid understanding of banking products and accounting principles. Experience supporting regulatory change and compliance-driven initiatives. Technical Skills Strong understanding of: o API-driven architectures o Microservices and event-based integration o Data models and relational databases Ability to read and interpret: API specifications (Swagger/OpenAPI) Sequence diagrams Data schemas Familiarity with cloud-based architectures (AWS, Azure, GCP) is highly desirable. Proficiency in using AI-enabled productivity tools, such as Copilot, to improve efficiency, generate insight and support decision-making. Applies critical thinking and sound judgement when interpreting outputs, remains accountable for the quality and accuracy of their work. Delivery & Methodology Experience working in Agile / Scrum environments. Comfortable working in large-scale transformation or multi-year core banking programs. Strong documentation and communication skills