Join Blaxel as our first non-founding engineer to define the future of AI infrastructure. You will own the end-to-end developer experience and pioneer "Agentic Experience" (AX), designing interfaces optimized for both human developers and autonomous AI agents. This is a high-impact role building the serverless compute backbone for the next generation of AI companies.
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DX/AX Engineer at Blaxel
Blaxel is building the 'AWS for AI Agents,' and they need a world-class engineer to define how humans and agents interact with their sub-25ms serverless engine. If you've scaled DX at places like Vercel or Fly.io and want to join a founding team in SF, this is your shot to build the infrastructure backbone for the next generation of AI scaleups like Webflow.
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This role is no longer actively hiring, but Jack can still help you discover similar open roles that fit.
Location
San Francisco, United States
Compensation
$175k-$250k + 0.1%-0.5% Equity
Company
Blaxel
Role overview
Software10 employees
Blaxel is AWS for AI agents. We’re a new kind of cloud computing infrastructure optimized for the unique demands of agentic AI, leveraging a purpose-built 25ms cold-start serverless compute engine.
Now processing billions of agent requests, we power the coding agents and background AI tasks infrastructure for top AI startups. Founders choose us when they hit the limits of general-purpose clouds. We solve the hard infrastructure problems—statefulness, ultra-low latency, and secure sandboxed code execution—so they can focus on building their core AI products.
We raised a $7.3M seed round led by First Round Capital.
What you will do
- Design and maintain high-performance CLI, SDKs (TypeScript/Python/Go), and MCP servers that make the platform a joy for developers.
- Architect clever protocols and API interfaces specifically optimized for seamless consumption by autonomous AI agents.
- Relentlessly improve "time to aha moment" by obsessing over API naming, documentation flow, and error message clarity.
Who this is a fit for
- Proven track record of owning DX at top-tier developer platforms like Vercel, Render, or Fly.io with strong TypeScript skills.
- Deeply fluent in agentic AI patterns with a builder mindset and the high-velocity execution of a former founder.
- Passionate about infrastructure and capable of refactoring complex APIs for clarity while maintaining sub-25ms performance standards.
Why this role is remarkable
- Pioneer a new category by defining the "Agentic Experience" (AX) playbook for how AI agents interact with cloud infrastructure.
- Join a elite team of 6 co-founders with deep infrastructure DNA (previously ForePaaS) and scale a platform already processing billions of requests.
- Backed by $7.3M in seed funding from top-tier investors like First Round Capital and Y Combinator (X25).
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Blaxel wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.