Top Principal Engineer Jobs in Seattle, WA

Define Scribd’s technical vision for agentic engineering and establish architecture, patterns, and guardrails for AI-assisted software development. Lead internal developer tools, libraries, platforms, and engineering workflow improvements across codebases, CI/CD, and infrastructure. Partner with engineering leadership on ambiguous cross-organizational initiatives, mentor senior and staff engineers, and drive adoption of coding-agent capabilities throughout the organization.

Lead the architecture and implementation of NVIDIA’s large-scale data retrieval platform for foundation-model training. Build web crawling, source discovery, indexing, scheduling, fetching, ingestion, provenance, and policy-enforcement systems. Ensure production reliability, scalability, observability, and cost efficiency while supporting open-web, licensed, partner, code, STEM, and multimodal data. Partner across engineering, research, product, legal, privacy, and governance teams, mentor engineers, and set technical direction.

Lead architecture and hands-on development for AccessOne’s financing platform across frontend, backend, data systems, integrations, and cloud infrastructure. Modernize production systems, build accurate and auditable financial workflows, lead complex initiatives through deployment, and establish engineering practices. Use AI coding tools responsibly while ensuring software quality, security, testing, reliability, and maintainability.

Own the architecture, roadmap, reliability, and scalability of AlphaSense’s cloud-native Data Platform. Build large-scale data migration capabilities across cells, regions, and geographies; enable self-service storage provisioning; and drive data placement, replication, tenant routing, and isolation. Partner with Cloud Platform, SRE, and DevEx teams, establish managed-first standards, identify scalability risks, contribute code across teams, and mentor senior engineers.

Principal Engineer responsible for defining technical vision, designing and delivering large-scale distributed systems, writing production code, and guiding major architectural decisions. The role establishes engineering standards, develops reusable systems, mentors senior engineers, supports roadmap and resource planning, and contributes to technical hiring. Key work includes cloud infrastructure, data architecture, AI/ML and LLM systems, monolith-to-microservices migrations, scalability, reliability, security, performance, and observability.

Principal Engineer responsible for architecting, building, testing, deploying, and operating full-stack TypeScript applications. The role leads React and Next.js front ends, Node.js services, APIs, cloud infrastructure, integrations, databases, CI/CD, observability, security, and AI capabilities. It owns products end to end, establishes engineering standards, partners with creative and operations teams, and provides technical leadership on client projects. Strong autonomy, communication, architecture, and production operations skills are required.

Architects and optimizes embedded Layer 2/Layer 3 protocol stack software for 4G/5G cellular systems. Develops new product capabilities, interprets communications standards, troubleshoots complex customer defects, and collaborates with distributed engineering teams to integrate, validate, and improve system performance.

Build and operate capacity, allocation, efficiency, attribution, forecasting, and data-platform systems for Anthropic’s multi-cloud compute fleet. Develop Python and SQL pipelines in BigQuery, Kubernetes-native infrastructure, observability tooling, utilization instrumentation, cost attribution, and forecasting systems. Collaborate with research engineering, infrastructure, inference, finance, and leadership while owning data quality, SLOs, schema contracts, operational reliability, and cross-provider resource planning.

Own the technical direction, architecture, analysis, validation, and development of aircraft avionics thermal and fluid systems. Lead cross-functional trade studies, modeling, testing, risk reduction, and aircraft integration efforts. Serve as a technical authority in design reviews and customer discussions, establish thermal engineering standards, mentor engineers, and deliver solutions addressing performance, reliability, manufacturability, and mission-critical aerospace requirements.

Sets technical direction for AI-ready data-serving systems, including vector and graph databases, real-time synchronization pipelines, governed APIs, and infrastructure-as-code blueprints. Designs scalable, low-latency services, evaluates architecture and technology choices, leads engineering projects, mentors engineers, documents technical solutions, and influences organization-wide engineering decisions.

Owns the architecture, technical direction, and implementation quality of Slate’s React Native mobile application. Leads C++ vehicle communication modules, security and encryption, backend-for-frontend integrations, observability, CI/CD, OTA releases, and iOS/Android certification. The role drives architecture decisions, resolves complex native and vehicle communication issues, mentors engineers, and supports the mobile product through its general availability launch.

Lead the mobile engineering team in evolving iOS and Android applications toward an AI-native, thin-client architecture. Define participant API and platform direction, contribute Python to backend services, establish AI-assisted development processes, improve DevOps and continuous delivery, mentor engineers, and partner closely with Product and Design. The role requires principal-level technical leadership, product focus, system architecture expertise, and hands-on use of AI coding agents.

Lead the architecture, design, and delivery of complex, scalable software systems for Expedia Group’s flight search platform. Guide engineering teams, develop APIs and data models, integrate responsible AI/ML solutions, improve operational excellence, and collaborate across functions. The role requires expertise in distributed systems, secure software architecture, modernization, and technical leadership, with preferred experience in neural search, vector databases, deep learning, ranking, personalization, and real-time model serving.

Leads major cross-department software initiatives from scoping through delivery, establishes technical roadmaps, evaluates technologies through proofs of concept, and guides strategic decisions. Oversees quality assurance, compliance, documentation, standards, and secure software delivery. Mentors teams, manages stakeholders and vendors, supports process improvement, and drives measurable productivity gains. Requires strong software engineering expertise, Java/Spring or Python coding, AWS, Databricks or Snowflake, and experience applying AI in software design.

The Principal Engineer will lead the design and delivery of core platform capabilities, focusing on scalable systems, AI application, and mentoring engineers while driving architectural decisions and improving operational systems.

Principal Engineer serving as the CTO’s technical deputy, leading day-to-day engineering execution, architecture, code reviews, developer support, and delivery. The role requires hands-on full-stack development across databases, backend, frontend, cloud infrastructure, and DevOps. It also champions AI-agent-assisted development by establishing workflows, guardrails, and quality standards. The engineer will mentor teammates, resolve technical blockers, improve reliability and documentation, and collaborate with technical, product, and research stakeholders.

Lead the technical strategy and architecture for Snap’s Ads Marketplace, including bidding, pacing, auctions, inventory optimization, traffic allocation, and ad reranking. Design scalable algorithms and distributed systems that improve advertiser performance, marketplace efficiency, revenue, and user experience. Lead cross-team engineering initiatives, experimentation, production delivery, reliability, and performance improvements while mentoring senior engineers and technical leaders.

Leads architecture, reliability, and automation for cloud network foundations across AWS, GCP, Azure, and internal infrastructure. Designs routing, segmentation, firewalls, connectivity, access, and infrastructure-as-code systems; establishes SLOs, monitoring, incident response, and recovery practices. Builds reusable automation, improves change safety, partners across platform, security, IT, and engineering teams, serves as a senior escalation point, creates operational standards, and mentors engineers.

Leads the design, modeling, simulation, testing, validation, and integration of fluid and thermal systems for autonomous aircraft and ground platforms. The role applies first-principles engineering, develops system and custom models, manages suppliers, supports component sourcing, and mentors engineers. It requires deep expertise in heat transfer, fluid dynamics, thermodynamics, thermal management, testing, CAD, and aerospace or defense system development.

Design scalable readout circuitry for topological qubits across component, subsystem, and system levels. Collaborate with multidisciplinary teams to codesign readout systems with qubit and control designs, analyze and present simulation results, develop engineering tools and processes, and support quantum hardware research while following safety and compliance standards.

Lead architecture and hands-on development of a self-service infrastructure orchestration platform for deploying services across clouds and regions. Design durable distributed workflows with dependency management, approval gates, safe retries, recovery, security, telemetry, and auditability. Apply AI-assisted engineering with human oversight, mentor engineers, lead cross-team reviews, and partner with Azure and Microsoft 365 teams to improve buildout efficiency and reliability.

Leads the architecture and technical direction of the Dynamics 365 Finance and Operations UI platform. Designs secure, scalable, reliable, performant, and accessible interfaces; partners with engineering, product, and design teams; evaluates emerging technologies; prototypes AI and MCP App experiences; drives technical alignment; and mentors engineers on software quality and best practices.

Leads the technical vision and architecture for Remitly’s Core Transfer Experience organization. Responsibilities include modernizing legacy distributed systems, establishing scalable and reliable backend, mobile, and web architectures, driving incremental migrations, setting operational excellence standards, enabling AI-native experiences, and influencing strategy across multiple engineering teams. The role requires hands-on technical leadership, mentoring, cross-functional partnership, and ownership of high-traffic customer-facing systems.

Lead the architecture and development of scalable APIs, control planes, workflow orchestration, and fleet lifecycle automation for NVIDIA DGX Cloud. Drive integration across cloud systems, Kubernetes, Slurm, and observability platforms while improving reliability and reducing manual operations. Provide technical leadership, mentor senior engineers, influence organizational strategy, and deliver high-scale distributed infrastructure for AI and cloud computing.

Lead architecture and roadmap for Azure PostgreSQL systems; design and review scalable, maintainable database engine features (query processing, storage, transaction logging, recovery, versioning, IO, scale-out). Influence coding standards and run code reviews, write proof-of-concept or production code, contribute to open-source PostgreSQL/Linux, and participate in rotational on-call operations.