Open to opportunities

Alexander Lee

@alexanderlee1

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Senior Backend Engineer building scalable Django APIs and data-intensive systems.

United States

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What I'm looking for

I’m looking to build and scale production-grade backend systems—especially Django APIs—where I can optimize performance, design reliable architectures, and deliver measurable latency and reliability improvements.

I’m a Senior Backend Engineer with 8+ years of experience designing, building, and scaling high-performance Django-based APIs and data-intensive systems.

I’ve consistently improved system performance, including reducing average API response times by up to 40% through database query optimization and performance tuning.

I implement asynchronous processing with Celery and Redis, and I’ve led architectural refactoring to decouple tightly coupled modules into scalable, maintainable service boundaries.

I bring strong expertise in AWS infrastructure and distributed systems, delivering reliable backend architectures for production environments while collaborating closely with frontend and product teams to ship end-to-end features.

Experience

Work history, roles, and key accomplishments

Senior Backend Engineer

Geo Solve

Jan 2024 - Feb 2026 (2 years 1 month)

Owned and scaled high-volume Django backend systems serving production traffic, improving average API response times by 40% through database query optimization and performance tuning. Implemented Celery/Redis async processing and led architectural refactoring to decouple modules into scalable service boundaries.

Python Django Django REST Framework PostgreSQL Celery Redis AWS EC2 RESTful APIs Docker Performance Tuning

Backend Engineer

Infantium S.L

Mar 2020 - Oct 2023 (3 years 7 months)

Designed and developed backend features for a growing production application, evolving database schemas while maintaining performance and data integrity. Implemented secure authentication (sessions, JWT, OAuth), reduced API latency via query optimization and caching, and added unit/integration tests to cut production regressions.

Python SQL Django PostgreSQL JWT OAuth Caching Unit Testing Integration Testing

Backend Developer

Elements Interactive

May 2017 - Jan 2020 (2 years 8 months)

Built backend systems for e-commerce capabilities including orders, payments, and inventory management, developing APIs used by thousands of users and integrating third-party services. Improved payment reliability by handling edge cases and failure scenarios, and implemented background jobs to move heavy processing outside the request lifecycle.