About us

• Contrario builds production agentic AI infrastructure used by 300,000+ scientists daily.

Role

• We're hiring a senior engineer with 5+ years of experience to take over the technical work our founder is currently doing — architecture decisions, code reviews, agent infrastructure, and evals.
• This is not a feature-building role.
• You'll own the reliability, scalability, and architecture of a production agentic system used by 300,000+ scientists daily.
• You'll work remotely from Latin America with PST/EST overlap required.

Key responsibilities

• Reduce agent failure and deviation rates across long-running, multi-step workflows
• Design and implement durable execution systems — background jobs, async tasks, retry logic, human-in-the-loop steps
• Build and maintain evals and benchmarks to measure agent performance
• Architect scalable infrastructure to support millions of users
• Own code reviews and technical decision-making alongside the founding team
• Expand product capabilities and ship new features end-to-end

Qualifications

• Production agentic AI experience — has built and deployed agentic workflows to real users at scale, with proper fail-safes, not structured generation or prototypes. Strong Python background.
• Strong DevOps and infrastructure background — durable workflows, long-running jobs, async execution, failure handling, observability. Experience with Docker, Kubernetes and AWS.
• Full-stack product experience — has shipped customer-facing features end-to-end. Comfortable with TypeScript, Node.js and React.js.
• Familiarity with Machine Learning workflows and LLM-based systems.