Member of Technical Staff (Software Engineer, Backend API)

TL;DR

Member of Technical Staff (Software Engineer, Backend API) (AI): Building and operating high-traffic APIs, agent-first SDKs, and platform capabilities that connect frontier AI models with developers, with an accent on API design, distributed systems, and production reliability. Focus on designing agent-facing interfaces, hardening authentication and data-handling guarantees, and turning emerging research capabilities into dependable production features.

Location: Berlin, Germany; Serbia; London, UK; or New York, NY, USA

Company

Building an AI-powered search and developer API platform for people and agents that build with AI.

What you will do

• Own critical APIs end to end, from RFC design and implementation through staged rollout and continuous improvement.
• Contribute to product codebases across Go, Rust, and Python.
• Build agent-facing capabilities including hosted MCP, tool calling, connectors, and authentication flows.
• Harden public APIs for enterprise use through secure authentication, data-handling guarantees, guardrails, and reliability improvements.
• Create production monitoring and dashboards, respond to alerts, and lead actionable postmortems.
• Partner with Research, Product, GTM, and customers to turn frontier model capabilities into useful API features.

Requirements

• Experience designing and operating distributed, high-load systems.
• Daily experience building with frontier models and AI tooling, with the ability to explain agentic workflows in detail.
• High autonomy, strong agency, and product sense focused on developer and customer needs.
• Working fluency with a major cloud provider, Kubernetes, and CI/CD.
• Depth in either API product engineering or platform operations, with genuine interest in the other area.

Nice to have

• Experience building agent loops or harnesses.
• Experience creating developer or API tooling in the LLM ecosystem, fintech, or payments.
• Open-source contributions to SDKs, frameworks, or integrations used by developers.

Culture & Benefits

• Work at the intersection of AI infrastructure, developer platforms, and product engineering.
• Collaborate directly with Research, Product, go-to-market teams, and customers.
• Own production systems and participate in the full software delivery lifecycle.