Home on sivchari

I received the Kubernetes Contributor Award 2025

Mon, 01 Jun 2026 00:00:00 +0000

At KubeCon + CloudNativeCon North America 2025, I received the Kubernetes Contributor Award 2025 from SIG Cluster Lifecycle. The citation read: “being always available to help and for the impact he made in the Cluster API project.” I was genuinely happy, but it was also a good moment to look back on what I have actually done. So I want to write down the work that led to this award and what I learned along the way.

I spoke at Go Conference mini in Sendai 2026

Sat, 21 Feb 2026 00:00:00 +0000

On February 21, 2026, Go Conference mini in Sendai 2026 was held. I gave a talk titled “Who tests the Tests?” and also enjoyed the other sessions and the after-party as an attendee. It was a great experience, so I want to write down my thoughts on the overall atmosphere of the event, my own presentation, and the community interactions in Sendai.

Sendai.go and Me

Sendai.go holds a special place in my heart. It was the very first offline conference I ever attended in person – Go Conference mini 2022 Autumn IN SENDAI. I had been speaking at Go Conference since I was a student, but back then COVID was only just beginning to settle down, so all my talks had been online. Speaking offline added a sense of liveness that’s hard to feel through a screen – seeing people actually listening, reacting in real time. I remember how much fun that was.

About

Mon, 01 Jan 0001 00:00:00 +0000

About Me

sivchari

Work

Period	Company
2025.6 - Present	newmo Inc.
2024 - 2025	Kauche Inc.
2023 - 2024	Ubie Inc.
2022.4 - 2025.4	CyberAgent Inc.
2022 - Present	Codatum Inc.

OSS Activities

Reviewer / Approver

Cluster API - Reviewer
Kube API Linter - Approver
Argo CD - Member

Community

Go Conference Japan - Main Organizer

Award

Year	Award
2025	Kubernetes Contributor Award (SIG Cluster Lifecycle)
2023 - 2025	CyberAgent Go Next Experts

Get in touch

GitHub: @sivchari
X: @sivchari
SpeakerDeck: sivchari
Email: shibuuuu5@gmail.com

Talks

Mon, 01 Jan 0001 00:00:00 +0000

2026

Go 1.26 Release Party

Who tests the Tests ?

Go Conference mini 2026 in Sendai

2025

Google Developer Group - DevFest Tokyo 2025

Go1.25 Release Party ~ nil pointer bug ~

govalid ~ Type-safe validation tool ~

Static Analysis x Kubernetes API Conventions = Kube API Linter

What’s GOCACHEPROG ?

2024

Visualization Go scheduler by gosched-simulator

Comfortable OSS Life with gh_extensions

Getting Started with protoc plugin

Deep dive into runtime features provided by Go1.22

Go 1.22 range over func/range over int

2023

GopherCon 2023 recap

Dive into arena package ~ Go 1.20 release party ~

What’s context package

Introduction to zero (planned for Go 1.22)

Go Conference mini 2023 in Kyoto