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Staff Software Engineer with 10+ years of experience building and scaling production systems in marketplace and healthcare domains. Expert in backend architecture, real-time data pipelines, distributed systems, and modern frontend development. Proven track record of owning features end-to-end, shipping impactful products, and improving system performance, reliability, and UX at scale. Deep experience with cloud-native engineering, observability, and secure integrations.…Staff Software Engineer with 10+ years of experience building and scaling production systems in marketplace and healthcare domains. Expert in backend architecture, real-time data pipelines, distributed systems, and modern frontend development. Proven track record of owning features end-to-end, shipping impactful products, and improving system performance, reliability, and UX at scale. Deep experience with cloud-native engineering, observability, and secure integrations.

Kevin Phan

Full Stack Developer, Back-End Developer, Web Developer, +2

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Staff Software Engineer with 10+ years of experience building and scaling production systems in marketplace and healthcare domains. Expert in backend architecture, real-time data pipelines, distributed systems, and modern frontend development. Proven track record of owning features end-to-end, shipping impactful products, and improving system performance, reliability, and UX at scale. Deep experience with cloud-native engineering, observability, and secure integrations.…Staff Software Engineer with 10+ years of experience building and scaling production systems in marketplace and healthcare domains. Expert in backend architecture, real-time data pipelines, distributed systems, and modern frontend development. Proven track record of owning features end-to-end, shipping impactful products, and improving system performance, reliability, and UX at scale. Deep experience with cloud-native engineering, observability, and secure integrations.

Available to hire

Staff Software Engineer with 10+ years of experience building and scaling production systems in marketplace and healthcare domains. Expert in backend architecture, real-time data pipelines, distributed systems, and modern frontend development. Proven track record of owning features end-to-end, shipping impactful products, and improving system performance, reliability, and UX at scale. Deep experience with cloud-native engineering, observability, and secure integrations.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Software Development Engineer at Amazon

February 1, 2019 - April 1, 2025

Delivered core IC contributions to Amazon Local Selling, launching in-store pickup and local-delivery features used by thousands of retailers and millions of Amazon shoppers. Managed real-time inventory pipeline using FastAPI, DynamoDB Streams, Lambda, Kinesis, SQS/SNS, and Celery, processing over 10M updates/day with strict idempotency, reducing oversells and out-of-inventory errors by 70%. Refactored high-volume reconcile services in Java/Spring Boot; built and optimized Go microservices for high QPS in inventory lookup paths with sub-100ms response times during peak traffic. Enhanced Node.js APIs powering Seller Central onboarding; redesigned PostgreSQL schemas and added Redis caching, cutting hot-path lookup latency from ~250ms to <80ms. Designed Elastic/ OpenSearch indices and geo-filtered queries supporting local availability on product pages, maintaining sub-100ms performance during large sales events. Engineered React/Next.js micro-frontend onboarding flows integrated with lega

Software Engineer at Doxy.me

July 1, 2014 - January 1, 2019

Executed WebRTC signaling (STUN/TURN, ICE) in Node.js and Python to deliver browser-based video visits, meeting HIPAA requirements with OAuth2/JWT, RBAC, and encrypted sessions. Created React/Redux scheduling, intake, and check-in workflows increasing completed pre-visit intake by 30% and reducing no-shows for busy clinic users. Developed HL7/FHIR and DICOM integration services (Flask, Node.js) to sync appointments and share clinical data with hospital EHR systems, reducing manual data entry. Added WebSocket + Redis pub/sub to keep waiting rooms and call state in sync; implemented Service Workers + IndexedDB for offline tolerance, cutting dropped or abandoned sessions by 40%. Migrated from monolithic to Java/Node/Python microservices; Dockerized workloads; introduced Jenkins-based CI/CD; reduced release time by 50% and enabled multiple safe deployments per week.