Staff / Principal

Anthropic is looking for a Staff+ Software Engineer to work on the vector search infrastructure behind Claude. You'll join a small team responsible for the vector database layer that serves Claude's retrieval workloads: its architecture, performance, scalability and cost. The role sits in our Databases organization and works day to day with the Search Platform team and the Memory & Search team. We're looking for someone who has built vector or search systems that ran in production, at scale, with real users and a real on-call.

• Own the core of Anthropic's vector database layer: index structures, storage layout, query execution and the serving layer
• Own production readiness - benchmarking against exact search, capacity planning, onboarding new workloads, and the operational tooling to run it at scale
• Drive the recall, latency and cost trade-offs - quantization, filtered search, index build and refresh strategy, and how compute and storage are separated and scaled
• Scale throughput by an order of magnitude as research and training demand grows
• Extend the retrieval stack toward hybrid retrieval - lexical search and fused ranking alongside vector search
• Set the evaluation methodology for the system - recall targets, latency objectives, cost per query, and the regression detection that keeps them honest
• Set technical direction for a growing team - lead design reviews, make architectural decisions others build on, and mentor the engineers joining the effort
• Share the on-call for the systems you own

• Direct experience building a vector database or approximate nearest-neighbor search system that ran in production at scale
• Deep knowledge of ANN index structures (graph-based, clustering-based or disk-resident approaches), vector quantization and filtered search
• Experience with search relevance and ranking
• Strong systems programming skills in a language such as Rust, C++ or Go, including performance-critical and memory-intensive code
• Experience designing and operating large-scale distributed storage or serving systems with strict latency and reliability requirements
• A track record of independently scoping and delivering ambiguous, multi-quarter technical projects
• Strong written and verbal communication, with experience driving alignment across teams with different priorities
• Interest in AI safety and Anthropic's mission

• Experience with object-storage-backed or disaggregated compute and storage database designs
• Experience building or operating full-text search engines (inverted indexes, BM25) or hybrid retrieval systems
• Familiarity with embedding models and the retrieval demands of LLM training and inference
• Experience using GPUs or other accelerators for index build or search
• Prior experience as a technical lead on a database or search infrastructure team

Annual Salary: $320,000—$485,000 USD

Minimum education: Bachelor’s degree or an equivalent combination of education, training, and/or experience. Required field of study: A field relevant to the role as demonstrated through coursework, training, or professional experience. Minimum years of experience: Years of experience required will correlate with the internal job level requirements for the position.

Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time. However, some roles may require more time in our offices.

Visa sponsorship: We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. But if we make you an offer, we will make every reasonable effort to get you a visa, and we retain an immigration lawyer to help with this.