DX/AX Engineer

Blaxel • San Francisco, CA

48d

About The Position

Blaxel is the perpetual sandbox platform for AI agents that need to run code fast. We let you keep infinite, secure code sandboxes on automatic standby while co-hosting your agents for near instant latency. This is enabled by our own technical backbone: a 25ms cold-start serverless compute engine.
Now processing billions of requests, we power the coding agents and background AIs for top AI startups & scaleups like Webflow or HumanBehavior. We solve the agentic infrastructure problems that traditional clouds aren’t built for, such has running AI code securely, statefully and with ultra-low latency — so that AI companies can focus on building generational products.
We raised a $7.3M seed round, led by First Round Capital.
We're looking for a world-class Developer Experience Engineer to define and own the developer experience for our groundbreaking AI infrastructure across all interfaces, features and products.
You'll be fundamentally designing how developers (and AI agents) interact with our platform. Your mission is to obsessively drive down the time, frustration, and effort it takes our users to go from "what is this?" to "wow, this is powerful.".
Your user isn't just human. You will be a pioneer of Agentic Experience (AX), designing interfaces so seamless and clever that AI agents can consume our platform as easily as developers. If you are a builder who believes that a world-class DX is a product's most critical feature and are excited to define it for a new category of cloud computing, this role is for you.
Blaxel is AWS for AI agents. We’re building a new kind of cloud optimized specifically for the demands of agentic AI — powered by a purpose-built serverless compute engine delivering sub-25ms cold starts.
We process billions of AI agent requests and power the infrastructure behind coding agents and background AI systems for top AI startups. Traditional clouds weren’t built for agentic workloads — we are.
We recently raised a $7.3M seed round led by First Round Capital.

Requirements

• A DX fanatic: You have a proven track record of owning and dramatically improving developer experience at a top-tier, developer-first platform (e.g., Vercel, Render, Fly.io, GCP).
• A builder and an architect: You are a strong software engineer who isn't afraid to dive deep into the codebase to build new SDKs, improve a CLI, or refactor an API for clarity.
• Proficient in Python, TypeScript, and Go: You have strong development skills across these three languages.
• Deeply AI fluent: You understand the emerging patterns of agentic AI. You're excited by the challenge of designing interfaces for agents, not just humans.
• User-obsessed: You possess deep empathy for developers. You feel physical pain when you see a confusing API, a bad error message, or a convoluted user flow.
• An execution machine: You have a bias for action and a proven track record of shipping. You thrive on a high-velocity, results-oriented team. Ideally, you’ve even been a founder and built your own product and brought it to market.

Responsibilities

• Design, build, and improve the developer experience across all platform interfaces, including maintaining our CLI, SDKs, and MCP servers that make our platform a joy to use.
• Obsess over API parameter naming and error message clarity to the logical flow of our documentation and guides.
• Actively design and implement clever interfaces and protocols optimized for consumption by AI agents, not just human developers.
• Define and track key DX/AX metrics, relentlessly measuring and improving "time to aha moment," "time to successful implementation," and overall platform adoption.
• Work closely with our Developer Advocate to gather user feedback and translate it into actionable engineering and product improvements.

Benefits

• Build a category: You'll be shaping the user experience for a new category of cloud computing, at the cutting-edge of AI infrastructure. The playbook for AX (agentic experience) in infrastructure has yet to be written. You'll help us get appealing to the top 1% of AI companies of our generation, from Lovable to HuggingFace.
• Direct impact & autonomy: As a key member of a founders-led team, your work will directly impact our growth trajectory. You'll have the autonomy to design things your way, with the full backing of the founders.
• A-List backing & resources: We're backed by the best in the business (First Round, YC repeat founders), giving us the resources and network to build a generation-defining company.
• Competitive compensation: We offer a top-tier salary and comprehensive benefits, as well as some equity. We are invested in your success.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed