Blacksmith Raises $66M Funding at $1B Valuation as AI Code Testing Becomes the New Bottleneck

Blacksmith, the San Francisco-based infrastructure platform for building and testing code, has raised $66 million in Series C funding at a $1 billion valuation, officially joining the unicorn club. The round was led by Sequoia Capital, with participation from Premji Invest and existing investors Peak XV Partners, GV, and Y Combinator .

The round comes just two months after Blacksmith’s $45 million Series B at a $550 million valuation, and represents a 17x increase from its $60 million Series A valuation in September 2025 . The company has now raised approximately $125 million in total funding .

The funding arrives as Blacksmith’s platform processes over 90 million CI jobs per week—up from 5 million in January—and annual recurring revenue has grown 17x over the same period .

Blacksmith Funding Overview By CREDX Media

Startup Name	Blacksmith
Founders	Aditya Jayaprakash (CEO), Aayush Shah, Aditya Maru
Founded	2024
HQ	San Francisco, USA
Round	Series C
Amount Raised	$66M
Valuation	$1B
Category	AI Infrastructure, CI/CD, Developer Tools
Lead Investor	Sequoia Capital
Key Investors	Premji Invest, Peak XV Partners, GV, Y Combinator
Total Funding Raised	~$125M
Weekly CI Jobs	90M+ (up from 5M in January)
Customers	10,000+
Key Customers	Mercury, Granola, Handshake, LangChain, Supabase
Compute Capacity	~10 MW across US and Europe

💡 Use of Funds

• Compute Expansion: Growing its dedicated CI cloud from ~10 megawatts to at least 5x that footprint in 2027 .
• Team Growth: Expanding from ~40 employees toward 75 by year-end .
• Infrastructure: Purchasing more servers to meet surging demand from AI-generated code .

Startup Overview: Blacksmith

What Blacksmith Is Building in Simple Words

Blacksmith runs the continuous integration (CI) infrastructure that companies use to build and test code before it ships. When a developer proposes a change—a pull request—that code must be compiled, tested, and validated before it can be merged. Traditionally, companies rent generic cloud servers from AWS, Google Cloud, or Azure to run these jobs. Blacksmith instead buys its own servers, installs them in data centers, and writes its own software to run CI workloads faster and cheaper .

• Purpose-Built CI Cloud: Blacksmith’s infrastructure is designed specifically for the spiky, unpredictable nature of CI workloads—demand jumps from zero to tens of thousands of CPUs and back .
• One-Line Migration: Teams using GitHub Actions can switch to Blacksmith with a single line change to their workflow file .
• Performance Gains: Developers on Blacksmith see CI jobs complete twice as fast and at 60% lower cost on average .
• Own Hardware, Own Software: By owning the hardware and writing the orchestration software, Blacksmith controls performance and margin in a way generic cloud providers cannot .

Why Blacksmith Matters

1. AI Moved the Bottleneck From Writing Code to Checking It CEO Aditya Jayaprakash frames the shift directly: developers who used to push three or four pull requests a day are now pushing “orders of magnitude more” thanks to AI coding tools, and “their CI infrastructure can’t keep up” . The constraint on shipping software is no longer writing it—it’s validating it.
2. Anthropic’s Own Data Proves the Trend Anthropic reported in September that CI jobs in its own codebase rose 25-fold in six months, with Claude writing 80% of its code . Even the leading AI labs are struggling to keep up with the validation workload their own models create.
3. The Growth Is Real and Measurable Weekly CI jobs on Blacksmith grew from 5 million to 90 million since January. Customer count went from ~800 at Series A to 6,000 at Series B to 10,000+ at Series C . Annual recurring revenue is now in the “tens of millions,” with largest customers spending over $1 million annually .
4. The Model Is a Bet on Compute Economics Blacksmith is, at its core, a compute business. It buys tens of thousands of bare-metal servers, installs them in data centers, and runs CI workloads on them. The moat, if it exists, is operational: absorbing unpredictable spikes efficiently enough to undercut cloud giants on price .

Founder Background: The Waterloo Trio Who Saw the Bottleneck Coming

Aditya Jayaprakash (CEO), Aayush Shah and Aditya Maru, founded Blacksmith in 2024. All three are computer science graduates of the University of Waterloo. Jayaprakash previously built search and advertising systems at Faire, while Shah and Maru were early engineers at Cockroach Labs—experience running large-scale distributed systems that directly informed Blacksmith’s architecture .

The founding insight was contrarian at the time: they bet that testing code, not writing it, would become the constraint on shipping software. When AI coding tools took off, that bet paid off .

Founder Intelligence: What Founders Can Learn from Blacksmith

• Bet on the second-order effect: Blacksmith didn’t build an AI coding tool. It built infrastructure for the consequence of AI coding tools—more code that needs validation. Second-order bets often have less competition and more durable demand.
• Own your margin: Blacksmith buys its own servers instead of renting from hyperscalers. In a compute-heavy business, controlling the underlying hardware is a strategic choice that protects unit economics .
• Speed of execution attracts capital: Blacksmith closed its Series B in March but didn’t announce it until August, then announced Series C ten weeks later. The company’s ability to grow into each valuation quickly is what justified the rapid re-rating .
• Solve the bottleneck everyone complains about: The phrase “CI is slow” is a universal developer grievance. Blacksmith turned a chronic pain point into a $1 billion business by solving it at scale.

Investor Intelligence: Why This Round Gets Premium Capital

Sequoia Capital led the round. Partner Isaiah Boone framed the thesis: “JP and team understood early that as AI agents wrote more code, the infrastructure to build and test it would need to change. What stood out to us was their deep systems expertise and speed of execution” .

Premji Invest, the family investment arm of Wipro founder Azim Premji, joined as a new investor. Existing backers Peak XV Partners (which led the Series B), GV, and Y Combinator all returned .

The investor lineage is notable: Peak XV is the former Sequoia India business, meaning Blacksmith’s last two lead investors share a heritage. The rapid re-rating—from $550 million to $1 billion in ten weeks—signals that Sequoia sees Blacksmith as a foundational layer in the AI software development stack, not just a faster CI vendor .

The Road Ahead for Blacksmith

Expansion Targets

With $66 million in capital, Blacksmith will:

• Grow compute footprint at least 5x in 2027, from ~10 MW across US and European data centers .
• Expand the team from ~40 to roughly 75 employees by year-end .
• Continue building beyond CI into broader code validation and merging workflows.

Competitive Response

Expect:

• Hyperscalers (AWS, Azure, Google Cloud) to improve their CI offerings, though their generic architectures remain a disadvantage for spiky workloads.
• AI coding platforms (Cursor, Claude Code) to add validation features, though Jayaprakash argues better models mean more code to check—and more demand for Blacksmith .
• GitHub Actions to remain the default for many teams, with Blacksmith competing on speed and cost.

Conclusion

Blacksmith’s $66 million Series C at a $1 billion valuation validates the thesis that the AI coding boom’s biggest beneficiary may be the infrastructure that checks its output. The company’s 17x ARR growth, 90 million weekly CI jobs, and 10,000+ customers demonstrate that the bottleneck has shifted from writing code to validating it—and Blacksmith is positioned directly in its path.

Market tailwinds favor Blacksmith: the explosion of AI-generated code, the inadequacy of generic cloud infrastructure for CI workloads, and the willingness of enterprises to pay for speed and reliability. The company’s Waterloo pedigree, own-hardware model, and Sequoia backing position it to scale as the validation layer for the AI software era.

For deep analysis of AI infrastructure funding, developer tool innovation, and companies reshaping how software is built, explore CREDX Media for comprehensive coverage of startup funding trends, valuation intelligence, and founder playbooks.

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Frequently Asked Questions

1. What is Blacksmith’s total funding and latest round size?
Blacksmith has raised approximately $125 million total. Its $66 million Series C was led by Sequoia Capital in October 2026 .

2. How much did Blacksmith raise in its Series C round and who led the investment?
Blacksmith raised $66 million led by Sequoia Capital, with Premji Invest and existing investors Peak XV Partners, GV, and Y Combinator participating .

3. What is the valuation of Blacksmith?
Blacksmith is valued at $1 billion following its Series C, up from $550 million at its Series B in August 2026 .

4. How fast did Blacksmith’s valuation grow?
Blacksmith’s valuation increased 17x in 13 months, from $60 million at its Series A in September 2025 to $1 billion in October 2026 .

5. Who are the major investors in Blacksmith?
Major investors include Sequoia Capital (Series C lead), Premji Invest, Peak XV Partners, GV, and Y Combinator .

6. Who are Blacksmith’s founders?
Blacksmith was founded in 2024 by Aditya Jayaprakash (CEO), Aayush Shah, and Aditya Maru, all University of Waterloo computer science graduates .

7. What is Blacksmith’s business model?
Blacksmith operates a compute-based infrastructure model, charging customers for CI jobs run on its purpose-built cloud. It owns its own servers rather than renting from hyperscalers .

8. What traction justifies Blacksmith’s $1 billion valuation?
Blacksmith processes 90+ million CI jobs weekly (up from 5 million in January), serves 10,000+ customers, and has grown ARR 17x since January, with revenue now in the tens of millions .

9. What are Blacksmith’s plans for the $66 million Series C capital?
Blacksmith will expand its compute footprint at least 5x in 2027 and grow its team from ~40 to ~75 employees .

10. Who are Blacksmith’s key customers?
Customers include Mercury, Granola, Handshake, LangChain, Supabase, and Ashby .

11. Who is the CEO of Blacksmith?
Aditya Jayaprakash serves as CEO and co-founder. He previously built search and advertising systems at Faire .