Resume

Summary

I am a software engineer with a focus on functional programming and build systems. My work in Haskell spans more than a decade and has produced widely used, recognized open source projects such as Ormolu and Megaparsec. In parallel, as an expert in Bazel and Nix I have helped many clients ranging from startups to international giants make their builds hermetic, reproducible, and fast.

Professional experience

2025–2026. Senior principal scalable builds engineer at Tweag. The later part of my time at Tweag was dedicated to scalable build systems, Bazel in particular. I led about five different engagements, including helping to design a massive Bazel migration for an automotive giant. I was also a manager, at first with 8 reports. Later on, in the period from February to July 2026, I led the Scalable Builds department of Tweag. I devised its strategy and oversaw internal initiatives, delivery, hiring, and client relationships.
2023–2025. Principal consultant at Tweag. Most of this period was dedicated to Bazel consulting for a well-known German automotive company. The work first targeted build-time improvements, then moved on to novel, non-trivial integrations between Bazel and CTC++, and later Coverity.
2019–2023. Senior software engineer at Tweag in Paris, France, and remote. Haskell and OCaml consulting for clients in fintech, later moving into Bazel.
2018–2019. Software engineer at Tweag (remote). Bazel and Haskell consulting.
2016–2017. Tier 2 Haskell developer at Stack Builders (remote). Haskell consulting for a number of diverse clients.

Open source

I have been active in open source for over a decade. My most significant contributions to date are in the Haskell ecosystem (the full list is at https://markkarpov.com/oss.html):

Ormolu—The de-facto standard formatter for Haskell source code.
Megaparsec—A widely used, industrial-strength monadic parser combinator library.
Req—An HTTP client library.

Writing

I have done a lot of technical writing, both on my own and for Tweag, where I also served as a blog editor for https://www.tweag.io/blog.

Much of my recent writing is about Bazel, for example “Integrating Coverity static analysis with Bazel” and “How to keep a Bazel project hermetic”. The full list of posts is at https://markkarpov.com/posts.html.
I have also authored in-depth tutorials, most notably the Megaparsec tutorial; see https://markkarpov.com/learn-haskell.html for more.

Languages

I speak Russian (native), English (fluent), and French (fluent).

Education

2009–2014—Polzunov Altai State Technical University. Engineer degree in informational technology and measuring engineering.