Senior Staff AI & Agentic Systems Engineer - Mozilla

Mozilla is building a new browser infrastructure platform for the new generation of web automation. We are looking for an experienced Staff Engineer to join our early-stage team at Mozilla to lead the architectural design and implementation of our next-generation AI agent frameworks and workflows. This is a "ground-up" role within a fast-moving, nimble team, making it a perfect fit for someone with early-stage startup experience who thrives on a blank slate. You will be the technical anchor for our AI engineering efforts, establishing the patterns for how we build, evaluate, and scale autonomous capabilities. This role sits within Mozilla’s New Products organization, which operates as an internal incubator for high-potential ventures. You will join a fast-paced autonomous team building a new product from its earliest stages. You’ll design and deploy production-grade multi-agent frameworks, complex orchestration layers, and custom AI developer tooling. You’ll navigate the tension between rapid prototyping and long-term sustainability, knowing when to cut corners to validate a concept and when to slow down to lay solid architectural foundations. You’ll integrate various large language models, selecting and optimizing models for specific agentic behaviors. You’ll lead by example using advanced AI coding tools to maximize velocity and establish best practices. You’ll implement frameworks for benchmarking, prompt engineering, and evaluating agent reliability, latency, and accuracy. You’ll set engineering standards, mentor engineers, and bridge research and product teams.