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thijsniks's profile
Thijs Niks
Thijs Niks
Thijs Niks
@thijsniks

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Thijs Niks

@thijsniks

Product Manager for ☎️ at @WhatsApp / ❤️ retweets

San Francisco, CA
thijs.niks.nu
Joined February 2009

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    Thijs Niks‏ @thijsniks 25 Nov 2019

    Thijs Niks Retweeted Rebecca (Slatkin) Sloane

    In 2015, my team updated the credit card number check in the Uber rider app and it accidentally started blocking Chinese cards — our fastest growing country. This was, of course, just before the Christmas store shutdown 📉😱https://twitter.com/RebeccaSlatkin/status/1198821836315869184 …

    Thijs Niks added,

    Rebecca (Slatkin) Sloane @RebeccaSlatkin
    Tweet your worst deploys to prod right before the holidays. Let’s scare some people tonight. I’ll go: (~2011) the day before the App Store closed for holiday break I pushed an app update that broke user registration. ...we were featured in the App Store over holiday break.
    12:18 AM - 25 Nov 2019
    • 8 Likes
    • Jaap Niks Rob Daniel michael Michael Berner Randy Reddig Dan Grover Bas Hintemann Malthe Sigurdsson
    2 replies 0 retweets 8 likes
      1. New conversation
      2. Thijs Niks‏ @thijsniks 25 Nov 2019

        You might wonder how that fails in practice: We wanted to auto advance the cursor from the credit card number field to the expiration date field. To do so, you need to know how long the card number is.

        1 reply 0 retweets 0 likes
        Show this thread
      3. Thijs Niks‏ @thijsniks 25 Nov 2019

        If a card number starts with 34 or 37, it’s an Amex card and 15 digits long. If it starts with a 51-55, it’s a Mastercard and 16 digits long. Etc.

        1 reply 0 retweets 0 likes
        Show this thread
      4. Thijs Niks‏ @thijsniks 25 Nov 2019

        If it starts with a 62, it’s a China UnionPay card and 16 to 19 digits long. We advanced at 16 digits, so most users could never type their full card number.

        0 replies 0 retweets 1 like
        Show this thread
      5. End of conversation
      1. New conversation
      2. Jaap Stronks‏ @jaapstronks 25 Nov 2019
        Replying to @thijsniks

        Ok that’s a biggie

        1 reply 0 retweets 0 likes
      3. Thijs Niks‏ @thijsniks 25 Nov 2019
        Replying to @jaapstronks

        Let’s just say that I had some uncomfortable conversations with senior decision makers after thatpic.twitter.com/zuGAIZp2wT

        0 replies 0 retweets 2 likes
      4. End of conversation

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