Kana Asuka Hayashi

Overview

Based in Tokyo. I work on payments infrastructure at Kingsway Consulting. Brought on-call pages for payments platform down from 40 a week to 3. Shipped a rewrite that took build times from 21 minutes to under 5. Before that: Toyota and SoftBank. Most at home with Kafka and PostgreSQL.

Slower in the last week of each quarter

Experience

1. Senior Backend Engineer

   Feb 2026 - Present
   Kingsway Consulting · 8 mo · Full-time · Tokyo, Japan
   • Shipped a rewrite that took build times from 39 minutes to under 6.
   • Cut p99 latency on the payments platform services from 546ms to 132ms.
   • Led the migration of 32 services to PCI DSS.
2. Backend Engineer

   Jan 2023 - Feb 2026
   Toyota · 3 yr 1 mo · Full-time · Tokyo, Japan
   • Took payment success rates from 91.5% to 96.1%.
3. Backend Engineer

   Dec 2020 - Jan 2023
   SoftBank · 2 yr 1 mo · Full-time · Tokyo, Japan
   • Moved 65% of payments platform traffic off a legacy monolith without a customer-facing incident.
4. Backend Engineer

   Jun 2017 - Aug 2020
   UOB · 3 yr 2 mo · Full-time · Tokyo, Japan
   • Moved 88% of payments platform traffic off a legacy monolith without a customer-facing incident.

Projects

No references yet.

Education

1. National Taiwan University

   BS, Electrical Engineering
   2012 - 2016