Funding · Enterprise Software & IT

Blacksmith raises $45 million Series B

By Startup Enthusiast · 14 August 2026

What they do

Blacksmith builds tools for developers and AI agents to validate and merge code faster

It raised $45 million in Series B funding led by Peak XV Partners, with participation from Google Ventures and Y Combinator

The company manages hundreds of thousands of CPU cores and plans to expand computing infrastructure 10x

Blacksmith announced a $45 million Series B funding round on 14 August 2026.
The round was led by Peak XV Partners, with participation from Google Ventures (GV) and Y Combinator.
The company's valuation is $550 million.
The funding closed in March 2026.
Blacksmith has raised a total of $58.5 million to date.
The company will use the funds to expand its computing infrastructure.
Blacksmith manages hundreds of thousands of CPU cores and plans a 10x expansion.

Peak XV Partners is expanding its US presence after separating from Sequoia Capital in 2023.
Peak XV hired former YC investor Arnav Sahu in 2025 to lead US investing.
Peak XV's US team has 8 members and has opened a San Francisco office.
Peak XV's US portfolio includes companies like Vapi, Mem0, Hyperbound, PostHog, Supabase, and TrueFoundry.

Blacksmith was founded in 2024.
Its initial product was automated code testing before deployment.
Its current product provides tools for developers and AI agents to validate and merge code faster.
Blacksmith launched CodeSmith, a cloud-based coding agent for building features, fixing bugs, and diagnosing CI failures.
It is developing CodeSmith QA, which autonomously tests code changes before merge.
Blacksmith serves 6,000+ companies, including Supabase, Clerk, Ashby, and Mercury.
Its CI jobs have grown 5%-10% week-on-week since the start of 2026.
Blacksmith claims its workloads run up to 2x faster and at 50%-75% lower cost than GitHub-hosted runners.

Peak XV Partners (lead) — Venture capital firm that separated from Sequoia Capital in 2023; expanding US presence.
Google Ventures (GV) (participated) — Venture capital arm of Alphabet.
Y Combinator (participated) — Startup accelerator.

Product: Cloud CI/CD platform running GitHub Actions workflows up to 2x faster at half the cost with AI optimization
Customers: Software development teams and companies using GitHub for continuous integration and code testing
How it makes money: B2B SaaS platform for continuous integration with usage-based and subscription pricing models
What sets it apart: Cloud-native CI platform optimized for AI-generated code validation with superior performance and cost efficiency
Operations: Cloud infrastructure running CI/CD workflows for thousands of customers with automated scaling and optimization