Staff Applied AI/ML Software Engineer

Location: Bellevue, WA | Hybrid: In the office 3 days per week | Employees: 150 | Industry: AdTechResponsibilitiesOwn the full software development lifecycle of LLM-powered systems, from requirements through production deployment and operational healthDesign and implement retrieval-augmented generation (RAG) systems, tool-use patterns, and multi-step reasoning workflowsIntegrate LLM-based services into the company’s products, internal tools, and data ecosystemDrive architectural decisions balancing capability, cost, latency, and maintainabilityEstablish evaluation frameworks and metrics to measure application quality and business impactWork with stakeholders to define product capabilities and build new features and integrationsChampion excellence in coding, testing, and quality across the team and cultureMentor engineers on LLM application development patterns and best practicesRequirements 9+ years of experience in software engineeringExperience designing and owning systems end-to-end, including 3-tier architectures, data flows, APIs, deployments, operationsStrong Python programming skillsHands-on experience building LLM-powered features in productionExperience with RAG architectures - vector databases, embedding models, retrieval strategiesPractical prompt engineering skills, with demonstrated ability to iterate and evaluate qualityFamiliarity with core ML concepts (classification, evaluation metrics, embeddings) and the judgment to know when traditional ML outperforms LLM-based solutionsExperience with agent frameworks and tool-use patterns (MCP, function calling) Familiarity with cloud environments (AWS preferred: EC2, S3, Bedrock) Self-starter who is organized, works independently, and is comfortable with ambiguityExperience collaborating with engineers and non-technical stakeholdersBenefits 100% employer-paid health, dental, and vision (including dependents and spouse/domestic partner), long-term disability and life insurance, 401(k) with company match, open PTO plus a birthday day off, 13 holidays, 5 recharge days, professional development reimbursement, cell phone, wellness, and internet reimbursement, fully paid parental leave (up to 22 weeks primary caregiver, 12 weeks secondary), and dog-friendly offices with pet adoption reimbursementCompensation$170K - $260KAnnual bonus and RSU participation