Don Wei Tran

Led full-stack architecture and delivery for regional fintech payment and wallet services across Go, Java/Spring Boot, React/TypeScript, and AWS/EKS. Architected concurrent Go payment workflows with idempotency and distributed queues supporting 250K+ transactions/day and reducing duplicate/retry-related failures ~35%. Designed resilient Java orchestration with typed domain contracts and clear gRPC/REST boundaries across merchant, wallet, and settlement domains. Built operations dashboards for real-time visibility and reconciliation, and implemented PostgreSQL audit/indexing and query tuning to reduce p95 latency ~40%. Codified AWS infrastructure via Terraform, operated services on EKS using GitHub Actions CI/CD and Datadog observability, and enforced OAuth2/JWT and IAM access control to sustain 99.95%+ availability.

Designed and operated cloud-native Go and Node.js services for fintech core banking, cards, and transfer workflows serving 3M+ API requests/day, owning distributed processing, integrations, data performance, observability, and production operations. Delivered React/Next.js frontend capabilities backed by GraphQL/REST and supported by Redux Toolkit, Tailwind CSS, and Material UI. Improved latency-sensitive paths through PostgreSQL tuning, Redis caching, batching, and database-access improvements, reducing p95 response latency ~40%. Defined REST/gRPC contracts with validation, timeouts, retries, and idempotency safeguards. Standardized Kafka/workflow orchestration patterns for async multi-step processes. Strengthened production visibility with Prometheus/Grafana SLO alerting on AWS/EKS, reducing diagnosis/MTTR ~30%.

Built secure full-stack fintech payment and ledger workflows using Java/Spring Boot services and React frontends, covering API design, transactional consistency, database performance, and release reliability. Designed domain services and asynchronous workers with validation, explicit transaction boundaries, and fault-tolerant processing across order and settlement flows. Improved PostgreSQL/MySQL performance with indexing, query tuning, connection-pool analysis, and transaction-boundary optimization, cutting slow-query latency ~35%. Implemented OAuth2/JWT authentication, RBAC, and audit logging under SOC 2-aligned controls. Expanded DevOps and CI/CD quality gates with JUnit/Jest/Cypress plus integration/load testing, reducing escaped release defects ~25%.