Owned major API gateway epics including a full rework of the accounts surface and a v1→v2 migration across services with no downtime. Led monolith-to-microservices migration; built the service template and bootstrapped new services from it. Built an AI code-review integration from scratch, rolled it platform-wide. Brought up a new tenant/region end-to-end.

Refactored and stabilized the billing and payment infrastructure for a global marketplace. Integrated multiple external payment providers. Built a billing system for internal clients. Delivered EU and GB tax compliance (VAT/GST) across the payment stack.

Built a trader automation platform from scratch: volume maintenance, triangular arbitrage, and market-making strategies with multi-provider extensibility. Delivered a full-stack system — Python microservices, a trader-facing frontend, and real-time order book collectors integrated with multiple exchanges. Led a small team; owned architecture, code review, and CI/CD.

Drove adoption of microservice architecture; integrated with banking and exchange systems. Designed and documented critical financial service APIs. Implemented CI pipelines; set up and maintained production and test environments. Led technical direction: task analysis, code review, developer mentoring.