Open to opportunities

Tony Lee

@tonylee

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Golang backend developer specializing in scalable microservices, low-latency systems, and cloud-native deployments.

United States

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What I'm looking for

I seek backend roles focused on scalable microservices, low-latency systems, strong testing and CI/CD, and cloud-native infrastructure with opportunities for impact and growth.

I am a Golang backend developer with 7+ years building scalable microservices, distributed systems, and cloud-native applications for fintech, SaaS, and logistics platforms.

At Loadsmart I architected and deployed 12 Golang microservices powering a Node.js logistics SaaS platform handling 1M daily API calls, and built a real-time GPS tracking system supporting 50k concurrent users with sub-200ms latency.

I have improved performance and reliability across roles by optimizing PostgreSQL queries, adding caching layers, integrating Kafka event processing to scale throughput 3x, and automating zero-downtime deployments with Docker, GitHub Actions, and AWS ECS.

I migrated services from Python to Go to reduce latency and infra costs, implemented secure JWT/OAuth2 authentication, built event-driven notification systems, and published open-source Go packages—demonstrating a strong emphasis on testing, observability, and robust CI/CD.

Experience

Work history, roles, and key accomplishments

Senior Backend Developer

Loadsmart

Jan 2022 - Mar 2025 (3 years 2 months)

Architected and deployed 12 Golang microservices for a logistics SaaS handling 1M daily API calls and built a real-time GPS tracking system supporting 50k concurrent users with sub-200ms latency; optimized PostgreSQL and caching to improve API response times by 40% and integrated Kafka to scale order throughput 3x.

Golang Redis PostgreSQL Kafka AWS ECS WebSockets Microservices CI CD

Software Engineer

TechNova Inc.

Aug 2020 - Sep 2021 (1 year 1 month)

Migrated Python services to Golang reducing latency from 450ms to 200ms and saving 20% infra costs; built secure payment REST APIs, integrated Stripe/PayPal/Plaid with retry queues to cut failed transactions 20%, and developed an event-driven notification system handling 100k+ daily events.

Golang Python Stripe PostgreSQL RabbitMQ Docker Jenkins REST APIs Testing

Junior Backend Developer

BlueSky Digital

Jun 2019 - Jul 2020 (1 year 1 month)

Designed shopping cart and order APIs in Golang serving 200k+ active customers, implemented inventory microservice with gRPC to reduce stock update delays from minutes to seconds, and integrated Elasticsearch for product search.

Golang gRPC Redis Elasticsearch PostgreSQL Kubernetes Microservices API Design SQL

Junior Backend Engineer

HealthWorks Tech

Jul 2018 - May 2019 (10 months)

Assisted in building Golang APIs for patient record management ensuring HIPAA compliance, designed PostgreSQL schemas with strict audit logging, and built a CSV-to-API ETL pipeline reducing manual migration work by 90%.

Golang PostgreSQL ETL JWT API Development HIPAA Testing Audit Logs

Freelance Backend Developer

Self-employed

Jan 2017 - Jan 2018 (1 year)

Developed real-time chat and task management apps in Golang using gRPC and Redis supporting 10k concurrent users, designed CI/CD pipelines with GitLab CI and Docker, and created scalable logging with the ELK stack for clients.