Experience

Built and operated a payment processing and card issuing platform, covering transaction processing, merchant integration, and internal operational tooling.

• Designed and owned backend services for payment processing, card issuing, and transaction lifecycle management
• Built and operated AWS-based infrastructure with secure networking, scalable compute, managed databases, and production-grade access controls
• Implemented secrets management, encryption, and key handling using AWS KMS and Secrets Manager
• Designed internal APIs and async processing pipelines for high-volume transaction handling
• Supported multiple payment methods and partner integrations with strong isolation and fault handling
• Built internal dashboards and data pipelines using Athena and QuickSight for operations and reconciliation
• Operated and debugged production incidents, scaling issues, and integration failures across partners
• Worked closely with business and compliance stakeholders to translate regulatory and risk requirements into system design

• Worked on internal platform and infrastructure systems supporting ~1,000 microservices across Java, Go, and Node.js stacks
• Designed and implemented service governance and container-based deployment workflows, enabling safer releases, traffic isolation, and gradual rollouts
• Built and optimized CI/CD pipelines to support high-frequency deployments while maintaining system stability
• Contributed to platform-level improvements for high-concurrency workloads, with peak protected traffic reaching hundreds of thousands of requests per second
• Collaborated closely with application teams to improve observability, failure handling, and operational reliability in production environments

• Designed and developed payment gateway services supporting international payment providers, including Worldpay, Payvision, and other acquirers
• Built backend services for transaction processing, reconciliation, and settlement, with strong emphasis on correctness and idempotency
• Integrated and maintained risk control and anti-fraud mechanisms within payment workflows
• Supported high-availability payment flows across multiple regions and currencies
• Worked closely with product, risk, and operations teams to ensure payment reliability and compliance under real-world constraints

• Participated in the evolution of the internal payment platform from monolithic services toward more modular and service-oriented designs
• Built and maintained backend APIs handling order payments, refunds, and exception flows
• Improved system stability through better logging, monitoring, and error handling in production systems

• Co-founded and operated a content-driven platform from zero to production
• Owned backend services, infrastructure setup, deployment pipelines, and day-to-day operations
• Built traffic acquisition, content publishing, and monetization mechanisms, reaching 100k+ daily page views at peak
• Gained hands-on experience in product decision-making, system tradeoffs, cost control, and operating under uncertainty
• Experience reinforced a strong bias toward simplicity, debuggability, and sustainable system design