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Mercari Advent Calendar 2025 is coming up!

Author:
Yasuhiro Shiwaku
 , 
Mercari Advent Calendar 2025 is coming up!
日本語で読む

Hello! This is yasu_shiwaku from the Mercari Engineering Office.

We have our annual Advent Calendar blogathon event in December every year and we’ll be hosting it again this year!

We have both Mercari and Merpay/Mercoin Advent Calendar at the same time, so please check out Merpay/Mercoin side as well.

▶Merpay & Mercoin Advent Calendar 2025

We’ll be sharing our knowledge of the technologies used by our engineers at Mercari group. We hope this Advent Calendar will help you to enjoy the days leading up to Christmas.

Advent Calendars 2024

Publishing schedule

This is a collection of links to each article. I recommend bookmarking this page for the prompt update, and it will be very useful if you want to check it out at a later date.

Date Theme / Title Author
12/1 Websocket XSS vulnerability discovery: My security journey at Mercari @philolo1
12/2 LLM Key Server: Providing Secure and Convenient Access to Internal LLM APIs @Hiroki Akamatsu
12/3 Shops Monorepo Five Years Later: A Tale of Bazel and Cursor @Jazz
12/4 Enhancing DX through Mercari’s Unified Platform Interface @whygee
12/5 メルカリ ハロ Web フロントエンドの1年間の改善と学び @mattsuu
12/6 Engineering The Semantic Layer: Principles for Data at Scale @sathiya
12/7 QAエンジニアがAIで日々の課題を解決した話 @yuga
12/8 Navigating Change: Learning to Reinvent in an Unstable World @Antony Chane-Hive
12/9 Search Results Quality Monitoring with LLMs @otter
12/10 LiveContactToolにおける機微情報の取り扱い~CloudDLPを使ったマスキング @sters
12/11 OpenID Connect Core 1.0 の Claims パラメーターの利用 @kgoro
12/12 Adsシステムの急成長を支える技術：信頼性と収益性を取り戻した「PJ-MARP」の全貌 @tokku
12/13 メルカリが、AI時代にナレッジマネジメントに投資したわけ @t-hiroi
12/14 メルカリAdsが広告を届けるまでの話 @yanap
12/15 TiDB Resource Groupでワークロードを制御する @ogataka50
12/16 The Cost of Speed: A Battle against Cost, Debt, and Diverging Systems @Sneha
12/17 Building a Learning Culture with DevDojo @mariz
12/18 Capturing Network Packets in Kubernetes @mshibuya
12/19 AI-Native 開発を加速する AWS Kiro の導入と、Okta を活用したアカウント管理の自動化 @amenbo & @siroken3
12/19 メルカリ内部の Dynamic Client Registration 活用事例 @task
12/20 PR駆動の変更、CI/CDでOS設定を自動反映 — Terraformで実現するJamf ProのIaC＋GitOps基盤 @yu
12/21 Non-AI tasks in the AI task force：AIツール開発の現場でこそ必要な「AI以外の」技術選定 @akkie
12/22 Tales of OIDC & OAuth Security: What It Takes to Trust a Token @Kahla
12/23 When Speed Wasn’t About Coding Faster: Our Journey to ‘One Person One Release’ @Sneha & @Yu
12/24 「AIが学習しやすいナレッジ基盤」メルカリが全社で導入したNotion Architecture ver1.0 @kiko & aisaka
12/25 AI-Nativeという選択 ー 正解のない時代に、メルカリが選んだ指針 @kimuras

Please bookmark this article and check it out when you want to read it so you can be aware of article publication notifications!

We’re looking forward to bringing you some interesting technology stories in the last month of 2025! I hope you’re looking forward to the Advent Calendar!
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