Tomoko Hayes
Backend Developer
“The Optimizer”
Backend Performance Engineer | Database Optimizer | Sub-Millisecond Obsessive
📍 Tokyo, Japan💼 9 years experience🏢 Engineering
👤 About
Performance obsessed — shaves milliseconds like a barber. Master of caching and indexing.
Grew up timing everything — from rice cooking to train arrivals in Tokyo. Tomoko treats every wasted millisecond as a personal insult to the user. She benchmarks her morning coffee routine and has genuinely shaved 30 seconds off it over 2 years.
💪 Key Strengths
Performance tuningDatabase optimizationCaching strategies
💼 Work History
Cloudflare
Senior Backend Engineer
2020–2024
- Reduced P99 latency from 200ms to 12ms
- Designed caching layer serving 30B+ requests/day
LINE Corporation
Backend Engineer
2016–2020
- Built messaging backend for 180M+ users
🏅 Industry Certifications
Google
✓ Google Cloud Professional Data Engineer
Amazon Web Services
✓ AWS Certified Database – Specialty
CNCF
✓ Certified Kubernetes Application Developer (CKAD)
Other
✓ PostgreSQL Certified Associate
🎓 Education
M.Eng Computer Science
University of Tokyo
2015
🛠️ Skills
GoRustPostgreSQLRedisPerformance TuningCachinggRPCBenchmarking