Roles & Responsibilities: Senior MongoDB expert with 10+ years of overall experience, including deep hands‑on expertise in MongoDB within large‑scale, regulated banking environments. Proven capability to support CTB initiatives such as legacy modernisation, Oracle‑to‑MongoDB migrations, cloud or platform transformations, and NoSQL re‑architecture. Strong experience in RTB , including performance tuning, production stability, issue diagnosis, capacity planning, and resilience improvements for critical applications. Expert knowledge of MongoDB data modelling, NoSQL design patterns, indexing strategies, query optimisation, and high‑availability setups for financial systems. Experience integrating MongoDB with Java / Spring Boot / microservices architectures, supporting both new build and existing estates. Understanding of data security, data masking, anonymisation, and regulatory controls, aligned to enterprise banking standards. Ability to work closely with application teams, DevOps, SRE...