Back End Developer

About This Role

Scaling infrastructure that handles millions to billions of agent workflow executions per month is the core of this technically demanding backend role, which focuses on distributed systems and reliability. This position suits a highly motivated backend engineer with experience operating systems at serious scale, ideally in fintech, devtools, or infrastructure-heavy SaaS.

Responsibilities

• Scale infrastructure that handles millions to billions of agent workflow executions per month
• Keep systems reliable under extreme concurrency and sudden load spikes
• Build secure, isolated execution environments for user-submitted code (Firecracker micro-VMs)
• Manage server lifecycle, spinning capacity up and down fast as load shifts
• Build out observability and reliability tooling across the stack
• Work in the open, with code reviewed by and visible to the wider developer community

Requirements

• Backend engineers who have operated systems at serious scale, fintech, devtools, or infrastructure-heavy SaaS
• Deep understanding of distributed systems, reliability, and infrastructure design
• Comfortable owning large surface areas with minimal direction
• Engineers who use AI tooling heavily (this is screened for directly in the interview)
• High intrinsic motivation (the team moves fast and does not slow down for anyone)

Benefits

• Equity of approximately 0.3%

Important Details

• Work format: Remote Europe or London

Application Process

• The bar is genuinely high, and it can be as this is one of the most popular clients and roles we have

About the Company

This Series A developer infrastructure startup's platform runs AI agents and background workflows in production, at massive scale, with some customers executing hundreds of millions of jobs per month. The team is approximately 20 people, with engineers owning large parts of the system while working directly with the founders on architecture; the product is also open source.