Lei Sim

Overview

Currently at Rakuten, where I work on platform engineering. Shipped 17 launches on the developer platform team without a rollback. Shipped a rewrite that took build times from 29 minutes to under 6. Most at home with observability and Kubernetes. Learning woodworking.

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Experience

1. Principal Engineer

   Apr 2026 - Present
   Rakuten · 6 mo · Full-time · Sydney, Australia
   • Backed 54 founders at pre-seed and seed.
   • Led or co-led 23 investments, 2 of them now at Series B or later.
   • Sit on 4 boards.
2. Senior Engineering Manager

   May 2023 - Mar 2026
   Shopee · 2 yr 10 mo · Full-time · Sydney, Australia
   • Grew the developer platform team from 4 to 31 engineers.
   • Built the experimentation framework 25 product teams use to ship changes safely.
3. Senior Platform Engineer

   Feb 2020 - May 2023
   Bank Central Asia · 3 yr 3 mo · Full-time · Sydney, Australia
   • Moved 94% of developer platform traffic off a legacy monolith without a customer-facing incident.
4. Senior Platform Engineer

   Nov 2016 - Feb 2020
   Gojek · 3 yr 3 mo · Full-time · Sydney, Australia
   • Built the experimentation framework 24 product teams use to ship changes safely.
5. Platform Engineer

   Oct 2014 - Nov 2016
   Mastercard · 2 yr 1 mo · Contract · Sydney, Australia
   • Wrote the Kubernetes service that now handles 69 million requests a day.

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Education

1. Waseda University

   BA, Computer Engineering
   2010 - 2014