Top Principal Engineer Jobs in Seattle, WA

Lead the architecture, roadmap, and deployment of optical interconnects and rack-scale fiber management for hyperscale AI infrastructure. Responsibilities include defining performance and cost targets, developing fiber management solutions, evaluating emerging optical technologies, driving supplier and industry ecosystem alignment, leading architecture reviews, and guiding solutions from proof of concept through manufacturing and fleet deployment. The role also supports testing, qualification, root-cause analysis, and operational issue resolution.

Architect and lead multi-generation optical interconnects for hyperscale AI infrastructure, including NPO, CPO, silicon photonics, advanced packaging, and rack-scale fiber management. Translate system requirements into optical, electrical, thermal, and reliability specifications; lead modeling, laboratory characterization, verification, qualification, manufacturing ramp, supplier alignment, and deployment. Drive cross-functional technical decisions across silicon, packaging, networking, manufacturing, and reliability teams while influencing ecosystem roadmaps and mentoring engineers.

Architect and build CADET’s production system for customer-grounded Copilot evaluations. Own end-to-end architecture spanning customer-signal capture, data enrichment, evaluation generation and execution, quality attribution, reporting, observability, and retention. Develop scalable services and pipelines, establish schemas and data contracts, automate quality gates, implement human-in-the-loop controls, and ensure privacy, security, reliability, reproducibility, and regression protection. Provide principal-level technical leadership across engineering, science, product, and platform teams while mentoring engineers and driving reusable capabilities.

Designs and delivers software automating AKS cluster provisioning, upgrades, and management on Azure Local. Owns features through production, makes architectural decisions, mentors engineers, and improves reliability, security, observability, performance, and operational consistency. The role involves distributed systems, networking, virtualization, Kubernetes lifecycle management, on-call support, and collaboration across Azure teams and stakeholders.

Lead technical direction and delivery for the Bing Ads auction platform. Own core ads-serving components, drive architecture, improve scalability, performance, reliability, and developer productivity, integrate AI features, mentor engineers, and manage operational excellence for a high-scale, low-latency system.

Principal Software Engineer responsible for designing, coding, testing, deploying, and operating AI-powered applications, agents, integrations, and workflows. Leads architecture, reliability, observability, security, compliance, experimentation, and production support while mentoring engineers and coordinating cross-team delivery. The role requires building scalable, maintainable solutions, managing dependencies, driving engineering excellence, and responding to live-site incidents through on-call responsibilities.

Lead technical vision and strategy for next-generation graphics developer tools. Design and prototype tooling, drive cross-team initiatives, mentor engineers, engage external developers and partners, and deliver production-ready solutions that improve graphics development, debugging, profiling, and optimization workflows.

Design, build, and operate large-scale, highly available platform services across GitHub (Actions, Enterprise AI, Identity, Billing, Git systems, database infrastructure). Provide technical leadership, mentor engineers, own architecture and APIs, participate in on-call incident response, drive reliability, security, testing, and roadmap decisions across cross-functional teams.

Provides end-to-end technical leadership for Azure SQL billing systems, defining multi-year architecture, modernizing billing and usage pipelines, improving correctness and reliability, and leading production incident investigations. The role aligns product, commerce, and platform teams around shared architecture and applies AI-assisted engineering practices across development, testing, debugging, validation, and operations.

Lead design, implementation, and operation of high-throughput data movement/replication services for Microsoft Fabric. Produce maintainable code, drive architecture and testing strategies, perform debugging and root-cause analysis, review code, manage dependencies, and collaborate with stakeholders to ensure security, reliability, performance, and customer-focused telemetry and metrics.

Leads advanced semiconductor package technology selection, design, qualification, manufacturing bring-up, supplier management, and reliability for Microsoft Azure silicon. Responsibilities include chiplet-based 2.5D/3D package development, substrate and assembly design, test vehicle definition, FMEA, EDA requirements, supplier assessments, package characterization, and cross-functional architecture decisions. The role requires extensive semiconductor packaging, manufacturing, reliability, simulation, and supplier-management expertise.

Lead optimization of Azure Cosmos DB for Microsoft's global AI plugin registry. Reduce RU consumption, eliminate throttling, resolve hot partitions, tune queries and indexes, improve latency and availability, and design scalable data models. Drive zero-downtime migrations, caching, batching, rate limits, telemetry, and graceful degradation. Serve in 24/7 on-call rotations, lead incident response, develop AI-assisted engineering tools, mentor engineers, and partner with the Cosmos DB product group.

Develop and operate large-scale, low-latency Azure cloud services for hardware health monitoring, anomaly prediction, telemetry, reliability, and performance. Evaluate and implement AI technologies, including LLMs, embeddings, RAG, and custom machine learning models, to improve firmware and hardware. Lead root-cause analysis, service restoration, testing automation, security and compliance, production deployment, and analytics reporting.

Develop and support semiconductor scan-test engineering for new product development and manufacturing. Responsibilities include ATE test-program development, scan and ATPG pattern integration, silicon bring-up, validation, characterization, debug, yield analysis, coverage closure, and failure diagnosis. The role collaborates with design, DFT, product, packaging, and manufacturing teams across complex SoC and advanced-node projects, applying scan, JTAG, boundary-scan, at-speed testing, and reliability methodologies.

Provides principal-level leadership across FinOps, cloud optimization, reliability engineering, and AI-driven automation. Designs secure, scalable solutions across Azure, AWS, Kubernetes, and hybrid clouds; develops cost optimization and governance workflows; automates operations with scripting, infrastructure as code, CI/CD, and event-driven services; advances observability, incident prevention, and operational readiness; builds executive dashboards; leads technical initiatives, proofs of concept, production adoption, and engineer mentoring.

Architect and deliver cloud-scale data integration products for Microsoft Fabric, owning end-to-end design, runtime, monitoring, reliability, security, and deployment. Mentor engineers, drive engineering excellence, integrate AI tooling, lead incident response as a DRI, and collaborate across Fabric, Azure Data Factory, and Power Query teams to meet scalability and resiliency goals.

Architects, develops, tests, and debugs C/C++ software for robotic water-jet cutting equipment and complex industrial systems. Works with real-time operating systems, machine control, computer vision, networking, and multi-process architectures. Collaborates with multidisciplinary engineering teams, resolves field issues, tests software on physical machines, and mentors junior developers.

Lead architecture, development, and operation of highly available distributed cloud systems powering Microsoft 365, Copilot, AI agents, search, retrieval, indexing, and data processing. Drive scalability, reliability, security, performance, and operational excellence; collaborate across teams, improve diagnostics and incident response, shape platform strategy, mentor engineers, and promote engineering best practices.

Lead functional validation of PCIe IP at block, cluster, or full-chip levels using UVM/C testbenches and VIP. Develop test plans and unit tests, create and manage regression suites, debug failures, and drive fixes. Improve validation efficiency via methodologies and tools and meet coverage goals toward successful tapeout.

Design and evolve distributed search and analytics systems for the Splunk platform. Lead complex engineering efforts from design through delivery, improve performance and reliability, mentor engineers, collaborate cross-functionally, and work with customers to resolve production issues.

Leads complex engineering projects from design through delivery, coordinating technical disciplines, contractors, resources, schedules, budgets, and compliance. Conducts design evaluations and reviews, develops project plans and specifications, monitors performance, resolves operational issues, and provides technical support. Ensures projects meet quality, safety, scalability, regulatory, and organizational requirements while managing multiple initiatives and communicating effectively with stakeholders.

Leads reliability and production engineering for Salesforce Agentforce Operations, scaling systems to global enterprise capacity. Responsibilities include reliability roadmaps, infrastructure as code, AIOps infrastructure, observability, incident prevention, performance tuning, distributed-systems debugging, and SQL/API optimization. The role provides technical leadership and mentorship while driving architecture, automation, and high-availability improvements across AI-powered services.

Leads architecture, integration, validation, qualification, and deployment of optical networking infrastructure for hyperscale AI systems. Defines networking requirements, integrates switches, NICs, PHYs, optics, cables, and SerDes, and drives performance, reliability, telemetry, automation, and root-cause analysis. Partners with silicon, software, firmware, datacenter, manufacturing, ODM, and supplier teams to deliver optical products from concept through production at cloud scale.

Lead mechanical design for federal facility projects, mentor staff, produce construction-ready IFC packages, manage budgets/schedules/staffing, ensure compliance with federal/industry standards, engage clients and business development, and perform site visits (~20% travel).

Leads quantum systems engineering for scalable quantum computing, including experiments, simulations, cryogenic hardware, electronics, instrumentation, device integration, and system validation. Directs multidisciplinary collaboration, establishes engineering and safety practices, manages technical risks, drives root-cause investigations, and develops reusable tools, methods, and documentation to improve reliability, scalability, quality, and performance.