Controller

About Blacksmith
We started by building infrastructure to run CI workloads really fast. Our first product helps companies run GitHub Actions substantially faster and cheaper by owning and operating our own global fleet of bare-metal machines rather than renting generic cloud VMs.
Today, we orchestrate tens of millions of Firecracker VMs each week, running CI for 7,000+ companies and tens of millions in ARR. We’ve grown 10x so far in 2026.
We operate thousands of bare-metal machines across multiple regions, regularly schedule 100k+ vCPUs concurrently, and run a petabyte-scale Ceph cluster that we manage ourselves.
We’ve raised $58.5M from Seed to Series B, led by Google Ventures (GV) & Peak XV Partners, and we’re intentionally building a small, but exceptional team.
Blacksmith was founded by a team with deep systems and scaling experience, including building search/ads infrastructure at Faire, and operating large distributed systems at Cockroach Labs. Our GTM is led by Jon Boyer, formerly Head of Sales at Zapier.
We're now extending the same CI infrastructure into a broader platform: running agent sandboxes at scale and building our own background coding agent on top of it.
As Controller, you’ll build the accounting function from the ground up. You own the close, technical accounting, financial reporting, and the internal controls that make all of it trustworthy. You’ll navigate complex deal structures across venture backed and enterprise contracts, manage the external audit relationship, and oversee equity accounting as our programs scale. This role is ideal for someone who thrives in a fast-evolving AI infrastructure business, where transactions span revenue contracts, large-scale infrastructure investments, and strategic financing. This role reports to the CFO.
What You'll Do
Own the month-end and quarter-end close — accuracy, timeliness, and improving both
Lead all technical accounting determinations: revenue recognition, equity, leases, and novel deal structures
Keen understanding of SPV-related transactions and reporting matters
Own global tax strategy, planning, and compliance — federal, state, and international
Manage the external audit relationship end-to-end; own the audit timeline and deliverables
Build and maintain internal controls and financial reporting infrastructure
Partner with legal on entity structure and transfer pricing
Oversee AP and AR
Build the accounting and tax teams beneath you
What We're Looking For
5-10+ years of relevant finance and accounting experience
CPA required; Big 4 background strongly preferred
Deep technical accounting expertise
Deep expertise in U.S. GAAP
Experience owning a close process and an audit at a high-growth technology company
Demonstrated ability to build an accounting function from scratch, including team, systems, and processes
Comfortable navigating ambiguity in deal structures and translating complexity into clear accounting positions
Exceptional technical writing skills, including preparation of accounting memos
Experience in AI, cloud infrastructure, data centers, or high-growth technology companies
Familiarity with infrastructure or hardware-intensive business models
Assist with ad hoc projects related to capital markets activity
Compensation and benefits
Medical, Vision, and Dental insurance.
Competitive base + equity.
401K match.
Unlimited PTO.
Annual offsite.
Early-exercise stock options
12 weeks fully paid parental leave (US)

Experience
Any (new grads ok)

Work arrangement
No