Senior Staff Software Engineer, API

Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We are a growing team of researchers, engineers, policy experts, and business leaders building beneficial AI systems.

We are seeking an exceptional Senior Staff Software Engineer to join the Claude Developer Platform team and serve as the senior-most individual contributor across API Engineering. This role sets the technical direction for the systems that make Claude accessible to developers, enterprises, and partners at scale. You will partner with Research, Inference, Platform, Infrastructure, and Safeguards to ensure the Claude API is reliable, capable, and positioned to grow.

• Define and drive multi-year technical strategy for the Claude API across API Core, Capabilities, Knowledge, Distributability, and Agents.
• Lead the highest-complexity, highest-impact engineering initiatives spanning multiple teams.
• Serve as the primary technical decision-maker for major architectural decisions with org-wide scope.
• Partner with Research, Inference, Platform, Infrastructure, and Safeguards for reliable delivery, security, and responsible deployment.
• Mentor and develop Staff-level engineers across the org.

• 12+ years of engineering experience with a track record at Staff or Senior Staff level.
• Demonstrated shaping of technical strategy for large-scale API or distributed systems platforms.
• Deep expertise in distributed systems and API architecture, with effective design docs, architectural calls, and coding in critical paths.
• Strong product instincts and a craftsperson's approach to API design.

Languages: Python, Golang, Rust. Infrastructure: GCP, AWS, Azure, Kubernetes. Databases: PostgreSQL (AlloyDB), Vector Stores, Firestore, Spanner. Tools: Feature Flagging, Prometheus, Grafana, Datadog, Claude Code.

Annual Salary: $405,000—$485,000 USD.

San Francisco, CA or New York City, NY. Hybrid policy: at least 25% in office.

Apply via the provided link. Deadline: None, rolling basis.