Daiki Hayashi

Senior Security Engineer at Cairn Bio · Application security · cloud security, IAM

Cairn Bio

Tokyo, Japan · JST (UTC+9)

9+ years experience

University of Tokyo

English, Japanese

Open to work

Messaging unavailable

Overview

I've spent 9 years on application security - first at Carousell, now at Cairn Bio. Mentored 8 engineers through their first promotion. I tinker with 3D printers.

Good reasons to reach out

Roles in application security
Second opinions on cloud security decisions
Questions about application security
Thoughtful intros to people in my field

Please don't message about

Crypto token projects
Agency or outsourcing pitches

Replies between meetings, usually same day

Skills

IAMSASTBurp SuiteOWASPthreat modelingcloud security

Open to workLooking for a role

closes in 3 months

Lead Security Engineer roles in payments - Tokyo or remote

Target roles: Lead Security Engineer
Level: Senior
Industries: AI infrastructure, Logistics
Work mode: Remote
Available: 90 days notice
Work authorization: Authorized to work in Japan
What I'm looking for: Hands-on work on threat modeling with room to mentor.
Not interested in: Night shifts

9 years in application security. Strongest at IAM and SAST. Open to the right conversation.

Tokyo, Japan · remote OKthreat modelingsastowasp

Open

Experience

Senior Security Engineer
Feb 2025 - Present
Cairn Bio · 1 yr 8 mo · Full-time · Tokyo, Japan
- Mentored 10 engineers through their first promotion.
- Grew the product security team from 4 to 24 engineers.
- Moved 74% of product security traffic off a legacy monolith without a customer-facing incident.
Security Engineer
Apr 2022 - Feb 2025
Deloitte · 2 yr 10 mo · Full-time · Tokyo, Japan
- Shipped a rewrite that took build times from 27 minutes to under 2.
- Moved 72% of product security traffic off a legacy monolith without a customer-facing incident.
Security Engineer
Oct 2019 - Apr 2022
REA Group · 2 yr 6 mo · Full-time · Tokyo, Japan
- Shipped a rewrite that took build times from 19 minutes to under 5.
Security Engineer
Oct 2017 - Oct 2019
Carousell · 2 yr · Full-time · Tokyo, Japan
- Shipped 23 launches on the product security team without a rollback.

References

No references yet.

Education

University of Tokyo
BEng, Electrical Engineering
2012 - 2016

Details

Compensation expectations

What they are targeting for their next role.

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