backend infrastructure for banks and fintechs

a core banking platform running on legacy technology, handling real customer balances and transactions, migrated to a modern stack incrementally. no big-bang rewrite: the old and new systems ran side by side while traffic moved over piece by piece, so the bank never stopped processing transactions during the transition.

an insurance platform split from a tightly coupled system into microservices with explicit API contracts, so multiple teams could ship independently without breaking each other's integrations. the focus was on making ownership boundaries and data contracts unambiguous across teams.

backend systems for asset management and fund operations, where correctness and a clear audit trail matter more than raw throughput. every calculation and state change needed to be traceable back to its source, for both internal reconciliation and external audits.

a crypto exchange transformed into international banking infrastructure: integrating with a regulated banking partner, introducing message queuing for reliable async processing, and building the compliance workflows required to operate as a regulated financial service rather than an unregulated exchange.