Tech Arch (Technology Business Architect) - Deposits & Core Banking Migration

We're working with a Digital Retail Bank, looking for a Technology Business Architect to work on a migration project for their Core Banking System (mostly concerned with their Deposits business).
The role will hire on an initial 6 month contract (c.£550-£600 day rate) - but should the candidate succeed, the role will require a much longer extension to oversee the project's implementation.
The Bank have already completed a high-level feasibility/options study and are now looking for someone to help add another granular level of detail - someone well versed on the technical side and who can effectively build a new digital front end. Similarly, they will need to integrate lots of other existing services to the new platform/system.
Key Requirements:

• Experience with migration/implementation of Core Banking Platforms/Systems - specifically for Savings Accounts/Deposits
• Banking Background - ideally digital, cloud native etc.
• Architecture Model = microservices
• Any experience implementing Mambu, Thought Machine, Pismo, SaaScada, etc. from a Savings/Deposits migration perspective would be highly relevant