EngFlow Remote Caching

EngFlow Remote Caching is a remote build cache aimed at teams that need fewer redundant compilations and test reruns. It is best suited to Bazel users who can operate a self-hosted service, while larger organizations can use broader build-system and deployment options. The central trade-off is clear: the free plan is useful but tightly bounded, and the expanded Enterprise tier requires a custom quote.

Overview

The service reuses build outputs remotely to reduce build time, developer workload, and compute spending. gRPC transport, cache compression, and Build without the Bytes are designed to reduce latency and avoid moving data that is not needed. A layered cache keeps frequently requested artifacts readily available, which can reduce repeated requests and network traffic when many builds share the same outputs.

The Build & Test UI shows cache hit rates, build time, and status in real time. That makes it possible to connect caching behavior with actual build performance instead of treating the cache as an invisible service. Remote execution is supported, and language coverage includes C/C++ with GCC, Clang, or MSVC and Java.

Key features

Transfer efficiency and cache insight

Compression and Build without the Bytes address the bandwidth and latency costs that can undermine a remote cache. Layering is intended to keep hot data close to the request path. These techniques are most valuable for build-heavy repositories and teams with repeated, shared workloads; they do not remove the need to choose an appropriate cache deployment or build-system integration.

Security and scale

EngFlow says builds run in isolated environments with encryption and, by default, dedicated infrastructure. It also says its solutions receive regular third-party audits against the five SOC 2 principles. The architecture is designed to distribute parallel work and cache load across multiple servers, covering small development teams through enterprise-scale projects. Those assurances and scaling goals will matter most to organizations with security review requirements or substantial concurrent builds.

Build-system coverage

Free supports Bazel. Enterprise adds Goma for Chromium and Soong for AOSP, making the paid tier materially more relevant to Android and Chromium engineering groups than the entry plan.

Pricing

Free

Free costs nothing and is self-hosted on Linux. It permits one machine and 32 CPU cores, with in-cluster remote caching, HTTP basic authentication, and mTLS. Community support is included. This is a sensible starting point for an individual or small Bazel team that can stay within one Linux host and does not need external cache storage, managed operation, or additional build systems. The one-machine and 32-core ceiling can become a hard constraint as parallel builds or team size increase.

Enterprise

Enterprise uses custom pricing and supports unlimited machines and CPU cores. It adds Linux, macOS, and Windows, in-cluster or external storage such as S3 and GCS, and self-hosted or managed deployment. Deployment choices include bare metal, AWS, GCP, Kubernetes, OpenStack, Azure, MacStadium, and Orka. GCP IAM, Google OAuth, SAML, and custom authentication options supplement the Free tier's HTTP basic authentication and mTLS. A dedicated engineer replaces community support. Choose it when infrastructure flexibility, multi-platform builds, higher concurrency, or operational assistance justify a negotiated contract.

A trial request form is offered, but no trial duration is stated. Free has no stated renewal charge because it is listed as free; Enterprise terms are handled through the custom quote.

Platforms

EngFlow lists API, Linux, macOS, self-hosted, web, and Windows platform coverage. In practice, the Free plan is Linux-only and self-hosted, while Enterprise provides the cross-platform and managed choices. CI integrations include GitHub Actions and Buildkite.

Who it's for

Choose EngFlow when a Bazel workflow benefits from a shared remote cache, cache-performance telemetry, and optional remote execution. Free fits a Linux-based team willing to run its own service within one machine and 32 cores. Enterprise is aimed at organizations running multiple build systems, requiring external object-storage caches, Windows or macOS support, managed deployment, or dedicated technical support.

It is a weaker fit for a single developer seeking a local compiler cache, or for teams that want a fully open-source server with no commercial tier decision. The Free plan also is not a practical match for workloads that quickly exceed its machine and core limits.

Pros and cons

• Pro: gRPC, compression, and Build without the Bytes target transfer overhead that can slow remote builds.
• Pro: Real-time cache-hit, build-time, and status metrics help teams verify whether caching is effective.
• Pro: Isolation, encryption, dedicated infrastructure by default, and stated SOC 2 audits address enterprise security reviews.
• Pro: Enterprise supports unlimited machines and cores, external S3 or GCS storage, and managed deployment.
• Con: Free is limited to Bazel, Linux, one machine, and 32 CPU cores, restricting larger or mixed-platform teams.
• Con: Enterprise pricing is custom, so budget comparison requires a sales conversation.
• Con: Free support is community-based, without the dedicated engineer available to Enterprise customers.

Alternatives

For a broader directory of options, see Build Cache Software.

Bitrise is the better choice when mobile CI is the priority and a free, single-person Hobby plan with occasional build credits is sufficient.

Pick Ccache for a free, local-style cache focused on single-file compilations across Linux, macOS, and Windows rather than a multi-server remote service.

cachepot suits teams wanting Apache-2.0 open-source software with no hosted plans stated.

Choose MozJPEG when the requirement is an open-source JPEG encoder library, not general build caching.

NativeLink is an alternative for self-hosted open-source distributed scheduling and remote caching across all build systems and major cloud providers.

FosterStack fits teams seeking a self-hosted MIT-licensed cache server with a $49 a month Team tier for multi-user controls.

bazel-remote is a straightforward Apache-2.0 self-hosted option with configurable cache size.

BuildFetch Cache is preferable when a metered open-source cache with 20GB storage, 50GB traffic, 100,000 requests, and 45-day LRU retention matches the workload.

Verdict

EngFlow Remote Caching is a strong choice for Bazel teams that want measurable remote-cache performance and a credible path from a small self-hosted Linux deployment to enterprise infrastructure. The main reason to look elsewhere is the Free plan's strict one-machine, 32-core boundary—or the need for an openly licensed, no-quote alternative.