Senior Technical Architect - Custody and Securities Services Location: Canary Wharf, London (3 days onsite / 2 days remote)Contract: 12 MonthsRate: Up to £850 per day Inside IR35 (via Umbrella) The Opportunity We are seeking an experienced Senior Technical Architect to play a pivotal role in the modernisation of a global Custody and Securities Services technology landscape. Working within a large-scale financial services environment, you will provide architectural leadership across complex post-trade platforms supporting areas such as Securities Settlements, Asset Servicing, Transaction Management, Cash and FX Processing and Tax Operations. This is a high-impact role where you will partner with engineering, product and business stakeholders to define architecture strategy, drive platform transformation, establish governance standards and ensure solutions are scalable, resilient and fit for future growth. What You''ll Be Doing Lead solution architecture across critical custody and securities services platforms. Design and deliver modern microservices and event-driven architectures. Define integration patterns using APIs, messaging technologies and cloud-native services. Drive application modernisation initiatives, replacing legacy and batch-based systems. Establish and govern architecture standards covering performance, resilience, security, scalability and recoverability. Lead architecture reviews and support governance processes including Permit to Build (P2B) activities. ..... full job details .....