Open to opportunities

Da Cai

@dacai

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Senior software engineer specializing in full‑stack web and mobile systems for scalable, high‑performance products.

United States

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What I'm looking for

I seek senior engineering roles building scalable full‑stack systems in collaborative, product‑focused teams, with opportunities to improve performance, reliability, and user experience.

I am a Senior Software Engineer with over 10 years building scalable full‑stack web and mobile applications, delivering measurable performance and user‑experience improvements across high‑traffic consumer platforms. I have led backend microservices, optimized databases and caching layers, and implemented secure authentication and CI/CD pipelines to ensure reliable production delivery.

I thrive in cross‑functional teams using Agile practices, collaborating with designers, product managers, and QA to ship features that reduce drop‑off and improve conversion. My work at large consumer platforms emphasized React/React Native frontends, Python backends (Django, FastAPI, Flask), PostgreSQL/Redis optimization, and AWS‑based deployments.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

DoorDash

Jun 2022 - Present (3 years 6 months)

Developed DoorDash online ordering web and mobile platforms and backend microservices, improving order completion flow and reducing user drop-off by 15% while increasing API performance through caching and query optimizations.

React React Native Django fastAPI PostgreSQL Redis AWS TypeScript Docker CI CD

Senior Software Engineer

Amazon

Sep 2018 - May 2022 (3 years 8 months)

Built scalable retail web and mobile platforms and backend services, adding live shopping features and optimizing caching and async processing to reduce latency and support large-scale personalized recommendations.

React TypeScript Django Flask WebSockets PostgreSQL Redis AWS Lambda Docker Kubernetes

Software Engineer

Citi

Jul 2015 - Aug 2018 (3 years 1 month)

Developed web and mobile banking applications with Angular/Ionic and Django APIs, implementing OAuth2 security, caching, and CI/CD to deliver secure, responsive digital banking features.

Angular Ionic Python Django OAUTH2 PostgreSQL Redis Jenkins Docker CI CD

Education

Degrees, certifications, and relevant coursework

The Ohio State University

Master of Science, Computer Science and Engineering

2013 - 2015

Completed a Master of Science in Computer Science and Engineering with coursework and projects focused on advanced software engineering and systems.

The Ohio State University

Bachelor of Science, Computer Science and Engineering

2009 - 2013

Completed a Bachelor of Science in Computer Science and Engineering covering foundational computing principles, software development, and systems engineering.