EngFlow

EngFlow is a build and test acceleration company founded by core Bazel engineers. Its platform distributes software builds and tests across clusters of machines and remotely caches results, with the aim of reducing build and test wall-clock time and hardware costs for engineering organizations. The product set includes Remote Execution, Remote Caching, a Build and Test UI, build analytics, and build forensics capabilities, plus MyEngFlow for local exploration of remote caching and the Build and Test UI [0][3][4].

The platform supports multiple build systems — Bazel, BuildStream, Goma Server, Pants, Soong (Android Platform), CMake and Buck2 — and can be deployed on-premises or on AWS, Azure, GCP, Kubernetes, MacStadium and OpenStack. It targets Android, Linux, iOS/macOS and Windows builds and integrates with CI systems including Bamboo, Buildkite, CircleCI, GitHub Actions, GitLab, Jenkins and Travis CI. According to a company-sourced profile, the service scales from 1 to 100,000+ cores, is SOC 2 Type 2 audited, includes SSO, and is backed by 24x7 support [0][6].

EngFlow also maintains open-source tooling on GitHub, including the Bazel Invocation Analyzer (a profile-analysis tool offering build performance recommendations, available as a web UI and CLI), a Gazelle C++ extension (gazelle_cc), an auth CLI for EngFlow RBE clusters, public API definitions, reclient configuration for Reclient builds against an EngFlow backend, and forks of goma_server, bazel-toolchains and seaweedfs [0][2][5].

Founding story

EngFlow was founded in 2020 by Ulf Adams, previously lead developer of Bazel at Google, and Helen Altshuler, previously lead of enterprise customer onboarding for Bazel at Google and co-creator of BazelCon. Adams said the team had spent four years talking to Bazel users who wanted the surrounding developer services Google had built around Bazel — remote execution, a user interface, coverage runners and deployment integration — and saw an opportunity to provide them outside Google [5][6].

Business model

EngFlow sells a commercial build acceleration platform to enterprises, offered through trials, a free tier and custom quotes, with deployment either in the customer's cloud or on EngFlow's infrastructure. It also runs a partner program for service firms offering Bazel migration and custom build rules, and publishes free open-source tools such as the Bazel Invocation Analyzer [0][6].

Sources indicate a commercial subscription/service arrangement with custom quotes, SLAs, a free tier and "no hidden costs" including SSO; specific pricing is not disclosed in the sources [0][6].

Traction

Company blog states the EngFlow fleet crossed 3.5 billion build actions processed per week, up from 250 million fourteen months earlier (about 14x growth), across enterprises including ARM, Asana, Block, BMW, Canva, Databricks, Plaid and Zoox. Published customer outcomes include Viasat (24 hours to 1 hour), Brave (2 hours to 15 minutes), Shift (5.5 hours to 37 minutes), Replay.io (4 hours to under 1 hour), MasMovil (20x faster releases) and Iterable (P90 build time 42 to 17 minutes, integration-test pass rate on master rising from the 70s to ~97%). One unnamed online marketplace customer is cited running 7,564 remote execution CPU cores [0][4].

Latest developments

Recent company blog posts describe the fleet reaching 3.5 billion actions per week, the maturation of the build analytics platform from prototype to production, content-defined chunking to halve LLVM build artifact storage costs, a Build Forensics investigation into stalled remote execution, the launch of the Mintlify-based bazel.build website, an Iterable case study on migrating from sbt to Bazel with EngFlow and VirtusLab, and Bazel build meetups co-hosted with Uber in Seattle (28 July 2026) and at Salesforce's Munich offices [4].