Staff Software Engineer, Frontier Security Team

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About the role

At Snowflake, we are powering the era of the agentic enterprise. To usher in this new era, we seek AI-native thinkers across every function who are energized by the opportunity to reinvent how they work. You don’t just use tools; you possess an innate curiosity, treating AI as a high-trust collaborator that is core to how you solve problems and accelerate your impact. We look for low-ego individuals who thrive in dynamic and fast-moving environments and move with an experimental mindset — who rapidly test emerging capabilities to discover simpler, more powerful ways to deliver results. At Snowflake, your role isn't just to execute a function, but to help redefine the future of how work gets done. We are hiring a Staff Software Engineer for our Frontier Security AI team. Snowflake's Frontier Security AI teams develop production-grade LLM applications, intelligent agents, AI infrastructure, and evaluation systems for enterprise customers — products that must meet a high bar for quality, security, reliability, and efficiency while operating over sensitive data at large scale. In this role, you will lead the design and development of our Agentic Harness and agent evaluation platform, working across product, infrastructure, applied AI, security, and modeling teams to take new capabilities from prototype to dependable customer value.   AS A STAFF SOFTWARE ENGINEER AT SNOWFLAKE, YOU WILL: - Architect and build the Agentic Harness that executes complex, multi-step AI workflows across models, tools, data, and services. - Design stable interfaces for tool execution, context construction, state management, memory, permissions, retries, fallbacks, and human review. - Own agent quality end to end by building evaluation harnesses, representative datasets, automated graders, experiment pipelines, and release gates. - Convert ambiguous reports such as "the agent feels worse" into measurable failure modes, reproducible tests, and durable fixes. - Analyze production agent trajectories to identify failures in reasoning, retrieval, tool use, context, orchestration, and application code. - Close the loop between production incidents, root-cause analysis, evaluation coverage, and regression prevention. - Develop offline and online measurements for task completion, correctness, groundedness, safety, latency, reliability, and cost. - Build simulation and replay infrastructure for golden-set tests, adversarial scenarios, model comparisons, and large-scale experiments. - Improve agent efficiency through model routing, prompt and semantic caching, context compaction, tool-result management, and token optimization. - Productionize new model capabilities as secure, observable, multi-tenant services with clear operational controls. - Establish standards for evaluation design, including sampling, ground-truth quality, grader calibration, leakage prevention, and statistical significance. - Define technical direction across multiple teams and lead projects whose scope extends beyond a single service. - Mentor engineers, raise the quality of architecture reviews, and remain directly involved in implementation and debugging.   OUR IDEAL STAFF SOFTWARE ENGINEER WILL HAVE: - 9+ years of software engineering experience, including technical leadership of complex production systems. - Direct experience shipping and operating LLM applications, AI agents, or model-backed workflows in production. - Strong background in distributed systems, service architecture, high-throughput APIs, concurrency, and failure handling. - Experience building an agent runtime, workflow engine, developer platform, evaluation system, or similar infrastructure. - Demonstrated ability to evaluate nondeterministic systems without relying on a single aggreg

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