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patio11's profile
Patrick McKenzie
Patrick McKenzie
Patrick McKenzie
@patio11

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Patrick McKenzie

@patio11

I work for the Internet, at @stripe, mostly on accelerating startups. Opinions here are my own.

東京都 Tokyo
kalzumeus.com
Joined February 2009

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    Patrick McKenzie‏ @patio11 May 6
    • Report Tweet
    • Report NetzDG Violation

    Patrick McKenzie Retweeted Tara Seshan

    Proration logic is one of those tarpits of suffering where it feels like maybe a 12 line method maximum and then years later senior engineers dread to touch it but it still somehow eats weeks of maintenance effort a year.https://twitter.com/tarstarr/status/1258109122446110721 …

    Patrick McKenzie added,

    Tara Seshan @tarstarr
    A truly monster gigantic enormous set of ships from the Billing team, a collection of amazing human beings who regularly have nightmares about prorations, fractional cents, and product catalogues so that YOU don't have to. https://stripe.com/blog/stripe-billing-updates …
    Show this thread
    12:44 PM - 6 May 2020
    • 3 Retweets
    • 62 Likes
    • Nat arthur johnston your friendly neighbourhood quarantined Alert crankycatcoder Jon Colverson Gustavo Fischer John Lee Michael Morisy Tomasz Skutnik
    6 replies 3 retweets 62 likes
      1. Peter Ibbotson‏ @peteri May 6
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        Replying to @patio11

        I worked on one of those many years ago. I think it had 200 line function in the middle that was a line from line port from a basic like DB programming language that was basically unrefactorable if you wanted to get the same results.

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      1. Scott Walton‏ @scott_walton May 6
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        Replying to @patio11

        Speaking from experience, it looks so easy (just divide then subtract some totals) but quickly devolves into a tar pit of business rules, race conditions and consistency errors. It’s worth paying someone else to do this!

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      1. Paul Reinheimer‏ @preinheimer May 6
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        Replying to @patio11

        We had to put “approximate charge” on a page because our provider calculated by the second. So between rendering the confirmation page and a user clicking the amount could change.

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      1. François Rejeté‏ @w00kie May 6
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        Replying to @patio11

        throw in leap year bugs to that proration code that never get fixed because systems team always say “we’ll have a new system in four years, no need to fix the root cause” but then eight years later you’re still on the same system...

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      1. αyoub‏ @kingstoune May 7
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        Replying to @patio11

        Proration logic with taxes. Add to it generating data for Accounting at line item level and arithmetics become hard😅-> I learned that balancing amounts on millions of items is hard (worked on billing/invoicing for years for Telco companies before everything became unlimited)

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      1. crankycatcoder‏ @crankycatcoder May 7
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        Replying to @patio11

        And discounting. I'm convinced that with sufficiently baroque discounting schemes nobody actually knows what the price is supposed to be.

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