Mid-Senior Harness Engineer, Python, TypeScript

Responsibilities

• Build Agent Runtime Systems; Develop and improve agent runtimes
• Design tool orchestration frameworks
• Build memory and context management systems
• Implement verification loops and agent self-checking mechanisms
• Improve reliability and execution accuracy
• Ship Integrations; Build integrations with business platforms and APIs
• Implement OAuth, webhooks, schema mapping, and data synchronization
• Create reliable workflows that operate on real customer data
• Support integrations across platforms such as: Salesforce, HubSpot, Stripe, Shopify, QuickBooks, Notion, Microsoft Teams, Slack
• Manage containerized workloads
• Improve scalability and system reliability
• Optimize infrastructure performance and operational costs
• Support high-volume production workloads
• Ship user-facing features directly into production
• Work across backend, frontend, integrations, and deployment systems
• Collaborate directly with founders and product stakeholders
• Own technical surfaces end-to-end

Requirements

• Experience building or significantly modifying AI agents
• Strong Python development skills
• Strong TypeScript development skills
• Experience with agent architectures and orchestration systems
• Experience shipping production software rapidly
• Strong systems thinking and architectural decision-making abilities
• Experience working with APIs, integrations, and distributed systems
• Strong understanding of AI-assisted development workflows