Sonny Nguyen

Built and shipped a B2B SaaS risk quantification platform to production. Architected reusable scenario modeling components, reducing duplicated work by ~30–50%. Led zero-downtime migration of a legacy risk model to a new architecture without production disruption. Implemented multi-provider billing (Stripe + PayPal) including subscriptions, refunds, and reconciliation; built an event-driven subscription lifecycle via webhooks with billing, CRM, and user state synchronization. Owned production database migrations (Prisma/PostgreSQL), deploying schema changes safely. Resolved critical production issues including race conditions, data integrity bugs, and simulated edge cases.

Architected and operated an AWS production AI-powered SaaS for a photo booth platform using NestJS, MongoDB, and Redis. Designed an async job pipeline processing ~1,500 AI tasks/month while maintaining sub-200ms API latency. Implemented Redis caching and rate limiting, reducing database reads by ~60%. Containerized services with Docker and deployed to ECS Fargate using least-privilege IAM. Built structured JSON logging and centralized log aggregation via CloudWatch. Integrated Stripe subscriptions with webhook verification and idempotent event handling. Implemented CI/CD using AWS CodePipeline and CodeDeploy to improve release reliability.

Founded and built a SaaS photo booth platform serving real users. Designed backend modules with domain-boundaries to isolate business logic and improve maintainability. Built scalable REST APIs using NestJS with MongoDB and Redis (caching and rate limiting), reducing repeated database reads by ~60%. Designed a synchronous AI media processing pipeline using message queue patterns. Decoupled API and rendering services to improve resilience under concurrent workloads. Provisioned and managed AWS infrastructure (EC2, ECR, S3, CloudFront, IAM) using Terraform and Docker deployments. Designed CDN-based asset delivery via CloudFront, reducing asset load time by ~40% while maintaining sub-200ms latency. Integrated Stripe for subscription billing and usage tracking. Delivered a trend-driven AI feature within 48 hours in response to seasonal demand, increasing short-term user engagement.