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Tuan Trung Doan

@tuantrungdoan

Message

Senior full-stack engineer specializing in scalable SaaS platforms and performant APIs.

United States

Message

What I'm looking for

I am seeking senior full-stack roles where I can architect scalable SaaS systems, improve performance, mentor teams, and drive CI/CD and observability best practices.

I am a Senior Software Engineer with 15+ years building scalable SaaS platforms, CRM-style applications, and analytics dashboards using Ruby on Rails and React.js.

I design performant APIs, optimize database queries (PostgreSQL/MySQL), and implement modular architectures that reduce duplication and improve team velocity.

My work has produced measurable results: improved query performance by 45%, cut initial UI load time by 35%, reduced API response times by 40%, and shortened release cycles by 50% through automation.

I thrive in Agile teams, mentor engineers on full-stack best practices, and prioritize clean, testable code, observability, and accessibility to deliver reliable products that drive business outcomes.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Kiggla

Sep 2018 - Jul 2025 (6 years 10 months)

Designed and maintained full-stack SaaS CRM applications using Ruby on Rails and React.js, improving query performance by 45% and reducing API response times by 40% through refactoring and indexing.

Ruby on Rails React PostgreSQL API Integration Performance Tuning GitHub Actions Docker Datadog

Software Engineer

Walmart

Feb 2012 - Aug 2018 (6 years 6 months)

Developed and optimized Rails + React analytics dashboards and migrated a monolith to Rails API + React SPA, speeding report generation up to 70% and reducing defects by 25% via automated testing.

Ruby on Rails React PostgreSQL SQL Optimization RSpec Jest API Versioning Accessibility

Front-End Developer

NerdsToGo

Jun 2005 - Nov 2010 (5 years 5 months)

Built responsive, user-focused web interfaces and reusable component patterns that reduced load times by 30% and improved UX consistency across CRM and scheduling systems.