Blacksmith is revolutionizing software development by optimizing continuous integration (CI) processes using gaming CPUs and innovative caching techniques to drastically reduce validation times, enabling developers to ship code faster. With a focus on simplicity, scalability, and autonomous quality assurance, the company has rapidly grown, securing major clients and funding to become a leading platform for high-speed, reliable CI.
Blacksmith is a company focused on solving the bottleneck in software development caused by slow continuous integration (CI) processes. CI is essential for developers to run checks and tests to ensure code changes do not break existing functionality. Despite the rise of agentic coding tools that enable developers to write code faster, the validation and testing phase has become the limiting factor in shipping software quickly. Blacksmith addresses this by building infrastructure optimized specifically for running CI workloads at high speed, enabling developers to validate and ship code much faster.
The founding team of Blacksmith came from diverse engineering backgrounds but shared a common frustration with the inefficiencies of existing CI systems. They realized that traditional cloud providers like AWS, GCP, and Azure were not optimized for the unique demands of CI workloads, which require extremely fast single-threaded performance rather than multi-threaded scalability. To tackle this, Blacksmith leveraged gaming CPUs—hardware typically used for video games—to deliver the speed needed for CI tasks. Starting with rented servers from a gaming-focused data center, the company has since scaled to owning large portions of their infrastructure, purchasing megawatts of power to support their growing customer base.
A key innovation at Blacksmith is their approach to caching, which involves moving cache artifacts closer to compute nodes to avoid redundant work and speed up CI jobs. Early customer acquisition was challenging, relying heavily on personal outreach and leveraging relationships with engineers who valued speed and efficiency. Their product’s ease of use—allowing teams to switch their CI to Blacksmith with a single click—helped secure significant contracts without a dedicated sales team. Notably, LangChain, a prominent customer, saw their CI wait times drop from 15-20 minutes on GCP to just 10-15 seconds on Blacksmith, dramatically improving developer productivity.
As Blacksmith has grown, they have maintained a focus on simplicity and scalability, building bespoke software to manage their expanding fleet and observability tools to monitor performance. They deliberately keep their product surface area small to avoid complexity and ensure they can scale efficiently with a relatively small team. However, demand surges, especially following the release of new large language models (LLMs), present ongoing challenges. To meet these spikes, Blacksmith continuously innovates on job scheduling algorithms, network topologies, and resource packing to maximize efficiency and reliability.
Looking ahead, Blacksmith aims to further enhance developer confidence through autonomous quality assurance (QA) tools that automatically gather evidence like screenshots and video snippets to validate code changes. Their vision is to eliminate the CI bottleneck entirely, enabling developers to ship software at the speed of their thoughts. With recent funding rounds, including a $66 million Series C at a $1 billion valuation, and a major marketing push in key tech hubs, Blacksmith is positioning itself as the go-to platform for fast, reliable CI in the era of accelerated software development.