Senior Technical Business Analyst (Contractors Outside IR35) - FINTECH / LONDON

WE ARE: At Adaptive, we are a financial consulting firm that partners with capital, commodity, and digital market participants. We value differentiation through technology. Our experienced teams design and deliver complex front-office technology solutions using our proven accelerators to create long-term competitive advantage. Our clients include the world's leading investment banks, investment managers, fintechs and capital market service providers. With a global reach with offices in London, New York, Manila, Barcelona and Montreal, we have a proven track record of delivering powerful, elegant and intuitive trading technology solutions. We are now looking for Technical Business Analyst services on an exciting project! THE INDIVIDUAL/S PROVIDING THE SERVICES WILL HAVE THE FOLLOWING EXPERIENCE: • Experience in QA, Software Engineering (ideally a senior Java developer), Technical Business Analysis, or another highly technical product environment • The ability to see the big picture while managing the finer details of delivery. • The ability to communicate and facilitate effectively across both technical and business stakeholder groups. • The ability to bring structure and clarity to ambiguous or complex delivery situations . • The ability to understand system behaviour and interactions beyond purely functional outcomes . • A strong technical and domain-driven mindset, with the ability to work closely with engineering teams • Hands-on experience with high-performance messaging or sequencing platforms such as Aeron, Kafka, Hydra, or equivalent — including an understanding of message ordering, state machine replication, and fault-tolerant distributed systems • Demonstrable exposure to low-latency or high-throughput messaging infrastructure in a financial or similarly demanding technical environment • A product-first mindset, combining Domain-Driven Design principles with a deep understanding of systems and user impact • The ability to define and document functional and non-functional requirements clearly and effectively • An understanding of performance, scalability, resilience, and availability in modern platforms • Experience working in Agile or Kanban environments across the full software development lifecycle • Demonstrable experience contributing to architecture and design discussions, simplifying complex challenges into deliverable solutions • The ability to create process flows , sequencing diagrams, and documentation that align technical and operational teams DESCRIPTION OF THE SERVICES: DRIVE CLARITY IN COMPLEX ENVIRONMENTS: • Shaping requirements and driving alignment in ambiguous situations, with minimal direction • Adapting to different delivery models across products, including engineering-led and BA-led ways of working • Define and maintain functional and non-functional requirements — including operational scenarios, acceptance criteria, and QA validation needs across distributed workflows • Ensuring questions are raised early, so that solutions are well understood, well defined, and ready to be delivered SHAPE THE BACKLOG AND DELIVERY: • Collaborate with engineering, QA, and architecture teams to translate complex technical solutions into structured backlog items, deliverable stories, and testable outcomes • Help stakeholders make their vision for the product materialise, especially in the early stages of each delivery phase • Be the stakeholders' proxy in the team — able to make quick, firm decisions on scope, requirements and prioritisation/triage • Drive backlog review and estimation processes, and take part in planning activities • Define acceptance criteria and tests up front as part of a Business-Driven Development approach • Follow up during implementation and testing phases to en