Carter Schonwald
New York, New York, United States
Summary
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Rockstar🎓
Top SchoolCarter Schonwald is a systems-minded software engineer with 15 years of experience designing and building foundational infrastructure for cloud-scale systems, distributed databases, and financial modelling platforms. He combines deep compiler and functional programming expertise—evident from contributions to the Glasgow Haskell Compiler and widely used Haskell libraries like vector and lens—with practical machine learning and generative AI consulting for commercial clients. Carter has led engineering teams at JPMorgan and Northwestern Mutual, architecting next-generation platforms that blend correctness, formal semantics, and performance-sensitive engineering. Equally comfortable in research and production, he has a track record of shipping low-level improvements (prefetch primops, Storable instances, build-system fixes) that ripple across ecosystems. Based in New York, he pairs an applied-math and theoretical-CS background from Yale with a pragmatic, product-oriented approach to hard systems problems.
15 years of coding experience
10 years of employment as a software developer
high school, high school at Bronx SciencePhD - left for more urban(e) climes, Computer Science, PhD - left for more urban(e) climes, Computer Science at Dartmouth CollegeBS, Applied Mathematics and Theoretical Computer Science, BS, Applied Mathematics and Theoretical Computer Science at Yale University
Stackoverflow
455reputation
8kreached
8answers
0questions
Github Skills (24)
maintenance10
quickcheck10
compiler-design10
lenses10
functional-programming10
haskell10
testing9
data-structure9
ghc9
data-structures9
template-haskell8
ffi8
performance-optimization8
ff8
cicd7
Programming languages (35)
Github contributions (5)
haskell/vector
Jun 2014 - Feb 2020
An efficient implementation of Int-indexed arrays (both mutable and immutable), with a powerful loop optimisation framework .
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 56 commits, 26 PRs in 5 years 8 months
Contributions summary:Carter contributed to the haskell/vector project by fixing a bug in the `enumFromTo_double` function and updating the test suite for better integration with the Cabal build system and CI runs. They also addressed redundant import warnings, improved the consistency of monad Fail, and relaxed bounds. Furthermore, the user made changes to address the test suite including refactoring the suite runner to tasty and updating build flags for optimizations.
intindexedarraysloopmutable
ghc/ghc
Oct 2013 - Nov 2022
Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
Role in this project:Back-end Developer
Back-end DeveloperContributions:69 commits in 9 years 1 month
Contributions summary:Carter contributed to the Glasgow Haskell Compiler (GHC) by addressing prefetch primops. Their work included adding documentation, refining the interface by changing the prefetch primops to have a `seq`-like interface and removing the `can_fail=True` attribute. Furthermore, the user added `Storable` instances for `Complex` and `Ratio` types, improving the library's capabilities. Additionally, the user contributed to the build system and configuration of the compiler.
ghcget-startednewcomershaskellcabal
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