320K–405K USD / year
Software Engineer, Tokens and Prompt Structures
AIHybrid — San Francisco, CA | New York City, NY
Published on 2026-09-16
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About this role
As a Software Engineer on the Encodings Infra team at Anthropic, you'll be responsible for designing and maintaining libraries that encode text and multimodal data for AI systems. The role requires collaboration with researchers and engineers to optimize encoding performance and support new research directions.
About the company
Anthropic builds reliable and interpretable AI systems, including the Claude family of models, for businesses and developers. The company focuses on AI safety research and practical AI assistants for enterprise and consumer use.
The team
Encodings Infra team
Stack
PythonRust
What you'll do
- Maintain and improve the encoding libraries
- Run experiments for optimal data feeding into Claude
- Design data structures to shield details of encoding
- Support new research directions in encoding
- Optimize encoding performance
What we're looking for
- 5+ years of software engineering experience
- Familiarity with ML terminology and LLM architecture
- Experience in complex refactors in large codebases
- Strong communication skills
- Results-oriented with a bias towards flexibility and impact
Nice to have
- Experience with tokenizers or encoding systems
- Maintaining widely-used libraries
- Performance optimization experience
- Experience with reinforcement learning
Benefits
- Competitive compensation and benefits
- Flexible working hours
- Generous vacation and parental leave