Blacksmith is a high-performance CI/CD platform designed as a drop-in replacement for GitHub Actions runners. It enables developers to run existing GitHub Actions workflows without modification while significantly improving speed, cost efficiency, and visibility into pipeline execution.

The platform focuses on accelerating build, test, and deployment workflows by running jobs on optimized infrastructure, including bare-metal CPUs with high single-core performance. This allows CI jobs to execute faster than traditional cloud-based runners, while also reducing queue times through instant provisioning of ephemeral environments.

Blacksmith introduces several performance optimizations at the infrastructure level. These include co-located caching for faster dependency downloads, persistent Docker layer caching to speed up container builds, and microVM-based execution environments that start in seconds. Together, these improvements can significantly reduce CI runtimes and feedback loops for developers.

In addition to performance, Blacksmith emphasizes observability in CI pipelines. It provides tools for searching logs across runs, analyzing failures, inspecting historical executions, and debugging jobs in real time. This addresses common limitations in traditional CI systems, where diagnosing failures or performance regressions can be difficult.

The platform is designed to be cost-efficient, offering lower compute costs compared to GitHub-hosted runners while maintaining compatibility with existing workflows. It is used by engineering teams to scale CI workloads, reduce build times, and improve developer productivity without requiring major changes to their infrastructure.

Blacksmith is built as a dedicated CI cloud rather than a general-purpose infrastructure layer, allowing it to make specialized trade-offs optimized specifically for continuous integration workloads in modern software development environments.

Key features include:

• Drop-in replacement for GitHub Actions runners
• Faster CI execution using high-performance compute
• Instant provisioning of ephemeral microVM environments
• Co-located caching for faster dependency downloads
• Persistent Docker layer caching for faster builds
• Full observability with searchable logs and run history
• Debugging tools including SSH access to running jobs
• Lower cost compared to traditional CI runners
• Compatible with existing GitHub Actions workflows

Common use cases include:

• Accelerating CI/CD pipelines for software development
• Reducing build and test execution times
• Debugging and analyzing CI failures
• Scaling CI infrastructure for large engineering teams
• Optimizing cost and performance of GitHub Actions workflows

Blacksmith is developed as a CI-first cloud platform focused on performance, observability, and cost efficiency, aiming to modernize continuous integration workflows for fast-moving development teams.