Matt Parsons @mattoflambda
Haskell and SQL. Team Lead for Backend Developer UX at @mercury. I wrote @prodhaskell so you can get a Haskell job! overcoming.software Denver Joined February 2013-
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Followers5K
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Following522
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love setting out to write a library, only to find that someone else did an optimal implementation a dozen years ago that is precisely what i need github.com/parsonsmatt/ti…
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implementing test case timing in Honeycomb so we can build a shameboard for slowest tests in our codebase
Athletics and Music are instrumentally important because they're no-bullshit and fun ways to practice Gitting Gud That they're intrinsically important is a nice boon
Matt Parsons retweeted
In the future, Haskell users will be able to annotate their programs to get better stack traces, thanks to work by the Well-Typed team: well-typed.com/blog/2025/09/b…
ChatGPT is surprisingly good at writing GHC plugins
comment parsing bugs are fun github.com/yesodweb/yesod…
On this day, ten years ago, I accepted an internship working with Haskell full time Crazy that I’ve spent a whole decade in this language
Matt Parsons retweeted
still working btw
adderall day: accomplish five projects non-adderall day: 8 hours deep work on a data structure library
Matt Parsons retweeted
@mattoflambda 9.10.2 ghci reloads got quite fast for me. 9.10.1 is super slow. 9.8.4 is also really fast. But < 9.8.4 is super slow. @romesrf fixed a GHC bug that impacted the reload times.
sort of regretting upgrading from GHC 9.6 to 9.10, reloads on our codebase went from 3-5s to 15s. punishing.
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