EngFlow

EngFlow was founded at the beginning of 2020 by Helen Altshuler and Ulf Adams, who had worked together at GoogleGoogleGoogle is an American technology company founded by Larry Page and Sergey Brin and incorporated in 1998. It became an Alphabet subsidiary in 2015. Its businesses include internet search, advertising, software platforms, cloud computing, and artificial intelligence.Open the full entry. Adams led Bazel development at Google and ranks second among the project’s all-time contributors; Altshuler led enterprise adoption of Bazel and co-created the first BazelCon. Google open-sourced the Bazel build system in 2015, based on its internal tool Blaze.⁠[1][2][3]

Altshuler is CEO and Adams CTO. The company works remotely; as of October 2021 the founders had not met in person since launching it.⁠[1]

In October 2021 EngFlow graduated from the Alchemist Accelerator and announced a $3.7 million seed round led by Andreessen Horowitz, with firstminute Capital, Alchemist Accelerator and angel investors participating. Its paying customers then included Snap, Brave and Mighty Technologies.⁠[1]

Andreessen Horowitz general partner Martin CasadoMartin CasadoMartin Casado is a computer scientist, entrepreneur and venture capitalist who is a general partner at Andreessen Horowitz, where he leads infrastructure investing. A major proponent of software-defined networking, he co-founded Nicira and served as its chief technology officer, and after VMware acquired the company he ran its networking and security business; he also co-founded the nonprofit MuralNet.Open the full entry called EngFlow “the Bazel company” in his investment note and wrote that 70 percent of its staff came from the original Bazel team and open-source contributors.⁠[4]

On November 15, 2022, EngFlow announced an $18 million Series A from Tiger Global, Andreessen Horowitz and firstminute capital, with angel investors including Cockroach Labs CEO Spencer Kimball, GitHub co-founder Tom Preston-Werner and Snowflake CFO Mike Scarpelli.⁠[2][3]

EngFlow then offered remote caching and execution for Bazel, Chromium and the Android Open Source Project (AOSP), released the open-source Bazel Invocation Analyzer and hired engineers including Jay Conrod from Block, Dropbox and Google. Customer Viasat said its builds became 24 times faster, and Brave’s build times fell from two hours to 15 minutes.⁠[2][3]

In March 2025 EngFlow announced the acquisition of tipi.build, a Zurich-based C and C++ build service, along with the public beta of its CMake remote execution service, CMake RE, and the open-source project Hermetic FetchContent. EngFlow had led tipi.build’s seed round in 2022, after which the two companies began building CMake RE together.⁠[5]

EngFlow said at the time that its platform supported Bazel, Buck v2, CMake, AOSP and Chromium, scaled from one to more than 100,000 cores and had passed a SOC 2 Type 2 audit.⁠[5]

EngFlow: Official website: https://www.engflow.com/ (opens in a new window).⁠[6]

X: Public account: https://x.com/EngFlow (opens in a new window).⁠[6]

LinkedInLinkedInLinkedIn is a social networking platform for professionals. It was founded in 2002 by Reid Hoffman and others, launched in 2003, and listed on the New York Stock Exchange in 2011; after Microsoft acquired it for approximately $26.2 billion in 2016, it became a wholly owned Microsoft subsidiary. Its revenue comes from membership subscriptions, advertising, and recruitment solutions.Open the full entry: Public profile: https://www.linkedin.com/company/engflow/ (opens in a new window).⁠[6]

YouTubeYouTubeYouTube is Google’s video-sharing and creator platform, founded in 2005 by Steve Chen, Chad Hurley, and Jawed Karim and acquired by Google in 2006. Built around video uploading, viewing, and creator earnings, the platform has developed Shorts, YouTube Music, Premium, YouTube TV, and products for children, and is headquartered in San Bruno, California, United States.Open the full entry: Public channel: https://www.youtube.com/@engflow (opens in a new window).⁠[6]