SWE @ DoorDash · MEng ECE & BSc CS, University of Toronto
Dechen(Erik) Han.
From database internals to AI-powered apps — engineering software at every layer of the stack.
About
CS and ECE grad from the University of Toronto. I want to build apps that really change people's lives.
Outside of work, I shoot photos and spend time with my cats.
Skills
TypeScriptJavaScriptPythonC++JavaSQLBashCTypeScriptJavaScriptPythonC++JavaSQLBashC
Next.jsReactNode.jsFirebaseAWSPyTorchNumPyJenkinsPrismaLinuxNext.jsReactNode.jsFirebaseAWSPyTorchNumPyJenkinsPrismaLinux
Full-stack DevMachine LearningDistributed SystemsDatabase OptimisationCloud ComputingNLPCI/CDSystem DesignFull-stack DevMachine LearningDistributed SystemsDatabase OptimisationCloud ComputingNLPCI/CDSystem Design
Experience
Software Engineer · DoorDash, Toronto
Jun 2026 – Present- Joining as a new grad software engineer.
Incoming
Full-stack Developer Intern · DreamFlow AI, Toronto
Oct 2024 – Jan 2025- Built AI image processing toolkit with TypeScript, Next.js & React — watermark removal, photo enhancement
- Designed Stripe webhook for subscription payments, cut failure rate by 20% across 2,000+ transactions
- Implemented 8+ Firebase APIs for auth, real-time DB and cloud storage
TypeScriptNext.jsReactFirebaseStripe
Software Engineer Co-op · Huawei Technologies Canada, Markham
May 2022 – Jun 2023- Managed 10+ Jenkins pipelines for Gaussdb distributed database, improved CI/CD efficiency by 30%
- Wrote GoogleTest unit tests, raised code coverage from 0% → 88%
- Implemented hybrid buffer pool with adaptive eviction, boosted system operation rate by 12%
C++JenkinsGoogleTestLinuxCI/CD
Software Developer Intern · Mingzhi Data Inc., Beijing
Jun 2021 – Sep 2021- Built backend features for a SaaS analytics product — advanced search and category management
- Refactored 3,000+ lines of legacy code, optimised DB structure and API endpoints
JavaMySQLREST API
Projects
Job Application TrackerJan 2025 – Apr 2025
- Full-stack app for tracking applications with JWT auth and AI-driven resume feedback via OpenAI
- Deployed secure cloud storage on AWS S3; built job and resume management REST endpoints
Next.jsPrismaAWS S3OpenAI API
Research-Driven Database OptimizationsJun 2024 – Sep 2024
- Under Prof. Niv Dayan (UofT CS) — integrated Monkey (SIGMOD '17), Dostoevsky (SIGMOD '18) and Spooky (VLDB '22) into RocksDB
- Achieved 2× better false positive rates and 40% improvement in P95/P99 GET tail latency
C++RocksDB
Education
University of TorontoSep 2024 – Dec 2025
MEng in Electrical & Computer Engineering
CGPA: 4.0 / 4.0
University of TorontoSep 2019 – Jun 2024
Honours BSc in Computer Science Specialist, Minor in Mathematics
Dean's List Scholar 2021 – 2024
Contact
Always happy to connect.