Senior Java & AI Engineer – Fintech Payment Product Remote

Gravitas Recruitment Group (Global) Ltd is seeking a Senior Java Developer / AI Engineer to design and build payment products for a Fintech Challenger Bank in Central London. The role is focused on hands-on Java and Spring Boot development within the fintech payment domain.

The ideal candidate will possess strong skills in AI tooling such as Claude or Codex and have a proven track record in designing and building payment products, not just platforms. This is an initial 6-month contract offering a rate of £600-£650 per day, with a hybrid work model requiring 2 days on-site in London.

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