Masato Yamaguchi

S

Director of Engineering at Loom HQ · threat modeling, Burp Suite

Loom HQ
Osaka, Japan · JST (UTC+9)
14+ years experience
Melbourne Business School
English, Japanese
Advising
Messaging unavailable

Overview

I lead application security at Loom HQ in Osaka. Cut p99 latency on the product security services from 834ms to 143ms. Before that: Alibaba Group and Commonwealth Bank. Former debater; now I argue with spreadsheets.

Good reasons to reach out
  • Advice on application security
  • Second opinions on OWASP decisions
Please don't message about
  • Recruiters for roles outside my stack
  • SEO and link-building offers
  • Offshore staffing offers
Skills
SASTAppSeccloud securityOWASPthreat modelingBurp Suite
AdvisingOpen to advising
closes in 3 months

Office hours for early-stage teams: application security and AppSec

Topics
application security, OWASP, Burp Suite
Format
Async reviews
Terms
Free for early founders
Capacity
One call a month
Best for
Engineers moving into leadership

22 years of application security. Can review plans, decks and hiring loops.

Osaka, Japan · remote OKowaspappsecsast
Open

Experience

  1. Director of Engineering
    Feb 2025 - Present
    Loom HQ · 1 yr 8 mo · Full-time · Osaka, Japan
    • Brought on-call pages for product security down from 31 a week to 1.
    • Grew the product security team from 5 to 14 engineers.
  2. Senior Engineering Manager
    Dec 2020 - Oct 2024
    Alibaba Group · 3 yr 10 mo · Full-time · Osaka, Japan
    • Built the experimentation framework 20 product teams use to ship changes safely.
  3. Senior Engineering Manager
    Jul 2018 - Oct 2020
    Commonwealth Bank · 2 yr 3 mo · Full-time · Osaka, Japan
    • Led the migration of 62 services to SAST.
    • Cut p99 latency on the product security services from 740ms to 125ms.
  4. Security Engineer
    Mar 2015 - Jul 2018
    Singtel · 3 yr 4 mo · Full-time · Osaka, Japan
    • Moved 82% of product security traffic off a legacy monolith without a customer-facing incident.
  5. Senior Security Engineer
    Apr 2013 - Dec 2014
    Sea · 1 yr 8 mo · Full-time · Osaka, Japan
    • Grew the product security team from 3 to 37 engineers.

References

No references yet.

Education

  1. Melbourne Business School
    MBA, Business Administration
    2005 - 2007
  2. Kyoto University
    BSc, Mathematics
    1999 - 2003

Details

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