ryan chan

Engineering Manager @Amazon. Based in Tokyo, Japan 🇯🇵. Also a table tennis player. tweets are my own.

[太田賢一／Design Mgr @kenichiota0711]

これは素晴らしいskillですね...！実際使ってみたら、自然な日本語文章が書けました。
https://t.co/saMmH0SySZ

[ryan chan @rtyqwe]

When is muse coming to App Store in Japan? 🇯🇵

[Clare Liguori @clare_liguori]

I just published a manifesto for all the developers out there who use an AI coding tool, but feel like they're not shipping much faster

I wrote 10 principles for changing how you build software with AI, based on what I've seen work for teams across Amazon
https://t.co/smq7Rt5QkZ

[未澄めめ 🐑 ᴍᴇᴍᴇ ᴍɪꜱᴜᴍɪ @memehitsuji19]

Amazonｻﾝに「購入して配送に追加」ボタン出てきて神
(よく買い忘れしちゃう民なのでまとめて配送してくれるの助かる)

[Fumiya Yamazaki | 山崎文也 @fmymzk]

東京都が2年で5億円(システム開発、イベント、プロモーション等)溶かして作った国営マッチングアプリ「TOKYO縁結び」の状況共有する。

予算規模は2年間で約5億円、民間のスタートアップならシリーズA〜B級の投資額。

で、実績はどうなったか

登録者数：約30,000人 成婚数：たったの121組 (昨年11月時点)
成婚率：約0.4%

計算すると、1組結婚させるのに税金「約413万円」かかってる。民間の相談所なら成婚料20〜30万の世界。コスパが悪すぎるどころの話じゃない。

しかもこのアプリ、様々な声を聴くと、仕様が「IE時代の化石」、認証はメールのみ、UIは前時代的、AIマッチングと言いつつただの性格診断の模様。

民間アプリなら数千円で無制限にアプローチできるのに、わざわざ行政の使いにくいアプリ使う理由がない

さらに「独身証明」「年収証明」必須で、恐らくマス層を足切りしてる。

江戸川区がやってるみたいに、民間の「タップル」とかと連携して、行政は「お墨付き」と「リテラシー教育」だけやるのが恐らく正解ではないかとも思う。開発費ゼロで1900万人の会員基盤にアクセスできるので。

尚、下記の通り、海外の失敗事例を完全になぞっている。

シンガポール：1984年から国営マッチング「SDU」を開始したが、「Single, Desperate, Ugly（独身、絶望、醜い）」の略だと国民にバカにされ、40年粘った末に2023年にマッチング事業から撤退。今は民間支援に切り替えてる。東京は40年遅れでこの失敗をトレースしてるではないか。

韓国：自治体主催のイベントで成婚率0.6%の爆死。あろうことか女性参加者が足りずに「女性公務員をサクラで動員」して人権侵害だと大炎上。金配り合戦も効果なし

フランス：出生率1.8の先進国だが、行政は「出会い」なんて斡旋しない。やってるのはPACS（事実婚保護）やN分N乗方式（税制優遇）。「出会い」じゃなくて「生活基盤」を整えたから産めるようになった

他方で、本当に効くのはもしかすると「コンクリート（広さ）」と「時間」だったりする。年末年始で反響が上がっている財務省と内閣府が出してるガチのデータがある。真犯人は「狭さ」と「通勤時間」という論説もある

通勤時間の壁： 夫の通勤時間が1時間増えると、第2子が生まれる確率は「25%」下がる。往復2時間かけて通勤してるパパが家にいないから、ママがワンオペになって「二人目は無理」ってなる構造。物理的に時間がない

住居の壁： 家の広さが1平米増えると、第2子出生率は「2%」上がる。たった10平米（6畳一間）広くなるだけで20%も確率が上がる。

これはものすごい感度
https://t.co/vVG2SNkT6N

東京の無理ゲー構造：
・通勤時間を減らそうと都心に住む→家賃高すぎて狭い家になる→部屋がないから産めない
・広い家を求めて郊外に行く→通勤時間が長くなる→ワンオペ育児で詰んで産めない

この「空間と時間のトレードオフ」を解消しない限り、アプリで何人出会わせても結婚・出産には至る確率は高くならない可能性大と思う。

課題が多いです

[ゆう | 新しい卓球 i2U（イッツー）の代表 @yu_daisumi]

今年の南大沢の大会、イベントが終わりました！

たくさんの人が参加してくれて、
少しでも還元できて
満足です

2026年もよろしくお願いします

[Paul McMahon @pwim]

The 2024 TokyoDev Survey results are live! Key insights:

- Minimal job market shifts since 2023
- Hybrid work rising, fully remote shrinking
- Office workers 4x likelier to job hunt than remote ones
- Women still earn less, even considering experience

🔗 https://t.co/9rhQkmkGSA

[Amazon.co.jp (アマゾンジャパン) @AmazonJP]

Amazonのお買物で
ドコモのdポイントがたまる、つかえるようになりました🙌
https://t.co/Df6VO0KVqq

さらに、対象のお買物では
dポイントとAmazonポイントの両方がたまり、ますますおトクに👀

詳細はスレッドで↓

[Karthik Hariharan @hkarthik]

A lot of senior engineers are going to find themselves coerced into becoming team leads with management responsibilities, just to provide relief for managers with too many direct reports.

My suggestion is to be open to trying it. But confirm with your manager that you can go back to IC work if it doesn’t work out, without negative repercussions.

It will give you perspective, insight into decision making, and most importantly, much needed support for more junior folks on your team.

[Alex DeBrie @alexbdebrie]

But can DynamoDB scale

[Andy Jassy @ajassy]

Really excited to share with customers Amazon Q—a new type of generative AI-powered assistant that is specifically for work and can be tailored to your business.

Amazon Q can help you get fast, relevant answers to pressing questions, solve problems, generate content, and take actions using the data and expertise found in your company’s information repositories, code, and enterprise systems. When you chat with Amazon Q, it provides immediate, relevant information and advice to help streamline tasks, speed up decision-making, and help spark creativity and innovation at work. Amazon Q is both your expert for building on AWS, and for analyzing your business.

We’ve built it to be secure and private, and it can understand and respect your existing identities, roles, and permissions and use this information to personalize its interactions. If a user doesn’t have permission to access certain data without Amazon Q, they can’t access it using Amazon Q either. And, from day one, we’ve designed Amazon Q to meet stringent enterprise customers’ requirements—none of their content is used to improve the underlying models. https://t.co/k99DMRIrQ8

[Adam Selipsky @aselipsky]

For #PrimeDay this year, Amazon Aurora processed 318 billion transactions, stored 2,140 terabytes of data, and transferred 836 terabytes of data, while DynamoDB handled trillions of calls and peaked at 126 million requests per second.

Always fascinating to see these mind-boggling numbers from @jeffbarr on how @awscloud powered this year’s record-breaking Prime Day. You all did a lot of shopping🛒!😊
https://t.co/wabQCe1zGZ

[Anime Aesthetics @anime_]

I have a dream..

[Jonathan Choe @choeshow]

#BREAKING: Memorial growing in front of 4th Ave and Lenora St. for Asian American victims of Tuesday’s shooting in Belltown.

Authorities say 34 year old Eina Kwon was shot multiple times and passed away at the hospital. She was 32 weeks pregnant. The baby did survive for a period of time but also died. Her husband, 37 year Sung Kwon was also shot but is expected to recover. They were both sitting in their Tesla during this incident. The couple had no prior interaction with shooter before this incident. This appears to be random.

Police say 30 year old Cordell Maurice Goosby is the shooter. He waived his right to appear in court today for his first appearance. Court docs say Goosby admitted to officers, “I did it, I did it.”

As for a motive, Goosby told police he thought he saw a hand gun in the vehicle and fired multiple shots through the window. No gun was in the car. He also told officers he has a history of “mental health care.” The gun he allegedly used to shoot the couple was found underneath another vehicle. It is a Smith & Wesson model M&P Shield 9mm. Goosby is a convicted felon for Aggravated Unlawful Use of a Weapon in Illinois.

A judge found probably cause and Goosby will remain behind bars until the King County Prosecuting Attorney’s Office likely charges him for Murder in the First Degree, Assault in the First Degree, and Unlawful Possession of a Firearm in the Second Degree.

The Kwons also own a well popular restaurant near Pike Place Market called Aburiya Bento House, just a few blocks from the shooting. It is closed today. But several neighbors and biz owners say they are devastated. I’m working on another update. #Seattle @MayorofSeattle @GovInslee @kcexec @CMAndrewJLewis @CMSaraNelson @CMTMosqueda @SeattleCouncil @SeattlePD
@downtownseattle @SeattleChamber @VisitSeattle @friendsWFS

[ryan chan @rtyqwe]

First time playing with CSS:

[萩原幸也 ®️ @onipro]

なかなかにバグってるドレス。ヴィクター＆ロルフのSS 2023より。

[DynamoDB @dynamodb]

In this case study, learn how and why @zozojp (one of Japan’s leading e-commerce sites) migrated to Amazon DynamoDB from their existing and underperforming RDBMS. In addition, DynamoDB helped ZOZO reduce their engineering overhead by 85.8 percent. https://t.co/779jRRhnXI

[Jeff Barr ☁️ @jeffbarr]

Amazon Prime Day 2022 – #AWS for the Win! - https://t.co/ayuqYM8vV4 .

"...5,326 database instances running the PostgreSQL-compatible and MySQL-compatible editions of Amazon Aurora processed 288 billion transactions, stored 1,849
TB of data, and transferred 749 TB of data."

[Jesse Pujji @jspujji]

Facebook & Instagram are NOT listening to your conversations.

What they are doing is MUCH more effective!

Here’s how it works👇🏽👇🏽👇🏽

[Laura Tacho 🌮 @rhein_wein]

We've all heard about (and rolled our eyes at) the out-of-touch software engineering manager:

"Can we deliver faster by adding more people?"
"I want to see more PR activity."

But here's an interesting study on the definitions of productivity from managers and developers:

[DynamoDB @dynamodb]

Join us *live* on March 1 and learn how our customers have used #DynamoDB to build some of the world’s most demanding applications. Ask #AWS leaders and experts with live Q&A. Register today! https://t.co/JxnNv7hU7S #databases #NoSQL