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.

This is a critical role, supporting the CEO through exceptional growth (we grew 12x last year & have already grown another 5x so far in 2026).

You’ll own the logistics & keep things running in a way that enables the CEO to fully focus on the success of the business.

This is a no egos role; you’ll preempt the need & jump into every task, acting as the CEO’s right hand as we hit this next phase of growth. In return, you’ll be entrusted with the most critical insights into running our business, a front seat at a true hypergrowth startup.

What you'll own

Calendar and time

Own the CEO's calendar end to end - scheduling, sequencing, protecting focus time, and making the hard prioritization calls about what earns a slot.
Build and maintain a lightweight "CEO operating system": weekly priorities, open loops, follow-ups, reminders.
Prep the CEO for every meeting - context, pre-reads, agendas, who's in the room and why.
Capture action items and make sure nothing drops after the meeting ends.

Critical communications

Manage the CEO's inbox: triage, prioritize, and draft responses in their voice.
Serve as a trusted point of contact for investors, board members, design partners, customers, and press - with judgment about what needs the CEO and what you can handle yourself.
Coordinate with EAs and chiefs of staff at partner, customer, and investor organizations.
Handle sensitive information with complete discretion.

Travel and personal logistics

Plan and book domestic and international travel end to end - flights, hotels etc.
Coordinate appointments, household services, purchases, deliveries, family travel, and other personal administration so they slot cleanly around professional priorities, and build systems that make the CEO's life admin run without their attention.
Solve problems in real time when plans change.

Office and team

Assist in the running of the San Francisco office day to day: vendors, supplies, food, space, the small things that make people want to come in.
Help to coordinate offsites, team dinners, customer dinners, and networking events.
Be the person who notices what's broken and fixes it before anyone asks.

What we're looking for

Proven experience supporting c-suite executives in the fastest paced environments. You have either supported the CEO of another hypergrowth startup, or you have supported Partners at the most demanding investment banking, private equity or venture capital firms.
The ability to preempt a need and to fill that need, without explicit direction.
The highest sense of urgency to all tasks; you are relentlessly focused on delivery.
A no ego approach to your work. Whatever the task, you own it.
Strong judgment and prioritization instincts: you know what matters most, and why.
Exceptional written communication, including the ability to write clearly in someone else's voice.
Comfort with ambiguity, shifting priorities, and a company that looks different every quarter.
High EQ, real discretion, and obsessive attention to detail.
Fluency with modern tools (Google Workspace, Slack, Notion, Linear) and a strong understanding of how a tech startup operates.
Comfort supporting both professional and personal logistics.

This role may not be for you if

You primarily think of an EA role as calendar management.
You need every task to be clearly defined before beginning.
You wait for direction when you can see that something needs to be done.
You are uncomfortable handling personal logistics or operational tasks.
You strongly prefer predictable days and fixed priorities.
You care more about the perceived seniority of a task than whether it needs to get done.
You want a remote or hybrid role.
You don’t operate with a strong sense of urgency or move quickly when something matters.

Compensation and benefits

Competitive base + equity.
Medical, Vision, and Dental insurance.
401K match.
Unlimited PTO.
Annual offsite.
Early-exercise stock options