Top Principal Engineer Jobs in Seattle, WA

Leads technical strategy, architecture, and engineering execution across Atlassian’s Rovo Chat, Search, Growth, Apps, and Clients experiences. The role drives scalable AI foundations, Search and Chat convergence, personalization, experimentation, reliability, security, and operational excellence. It involves leading cross-organizational initiatives, partnering with product, design, data science, and machine learning teams, mentoring senior engineers, and shaping multi-year technical roadmaps for customer-facing applications.

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.

Principal Software Engineer role at Atlassian with flexible remote, office, or hybrid work options. The provided description primarily details compensation, benefits, company culture, equal employment practices, and employment verification requirements; specific responsibilities and technical qualifications are not included.

Provides technical leadership on complex software projects from design through launch, addressing architecture, reliability, security, testing, and observability at scale. Leads company-wide engineering initiatives, establishes technical standards, mentors engineers, and promotes engineering excellence. Requires extensive full-stack development experience, strong communication, systems engineering expertise, customer-focused decision-making, and familiarity with A/B testing.

Leads complex software engineering initiatives from technical design through launch, provides architectural and technical leadership, drives engineering standards, mentors engineers, and collaborates across teams on company-wide projects. Requires deep experience building and operating scalable systems with strong testing, reliability, security, and observability practices, plus full-stack development expertise and familiarity with A/B testing.

Designs and tests analog circuits and systems for high-performance accelerometers, from architecture through verification. Responsibilities include requirements analysis, simulations, data analysis, test procedure development, design reviews, supplier coordination, and supporting new product development within schedule and budget. The role collaborates with mechanical, systems, and manufacturing teams and reports technical status to management and customers.

Lead architecture and delivery of a secure, low-latency Kubernetes-based compute platform for AI agents and untrusted workloads. Own isolation, scheduling, lifecycle, networking, policy, observability, and control-plane capabilities across GCP and AWS. Drive cross-team outcomes from design to adoption, improve developer experience via APIs and automation, and champion reliability, security, performance, and cost efficiency while mentoring engineers and setting technical direction.

Lead design, development, simulation, testing, and integration of fluid and thermal systems for autonomous aircraft and ground platforms. Drive first-principles modeling, prototype validation, supplier selection, and mentor junior engineers while ensuring system-level thermal performance from concept through production.

Leads the strategy, design, implementation, and operation of Expedia’s cloud platform and infrastructure. Responsibilities include Kubernetes and AWS platform engineering, infrastructure as code, CI/CD, observability, security, reliability, cost optimization, capacity planning, incident response, and cloud migration. The role contributes production code, drives cross-team adoption and technical standards, collaborates with stakeholders, and mentors engineers.

Serve as a global SME for Industrial Metaverse technologies (PLCs, IoT, cloud/edge, digital twins, AI, EMC/RED, cybersecurity). Lead standards work, develop test programs, perform and supervise complex testing, train staff, represent UL externally, and support clients and continuous improvement across regional or global labs.

Leads architecture and development of JPMC-VPC, a software-defined networking platform replacing legacy infrastructure. Designs control, distribution, and data plane components, gateways, load balancers, and IPAM systems. Builds production software in Go, Python, Rust, or C/C++, applies cloud-native engineering, CI/CD, infrastructure-as-code, observability, and responsible AI practices, and advises senior stakeholders on networking, distributed systems, and technology strategy.

Design and build secure, scalable platform services for distributed AI training and inference. Develop backend APIs, Kubernetes controllers, orchestration systems, asynchronous workflows, multi-tenant access controls, and developer tools. Improve reliability, observability, scalability, and engineering productivity while partnering with infrastructure and AI teams. The role also provides technical leadership, mentoring, and cross-functional collaboration throughout platform development and production delivery.

Designs, builds, and operates large-scale AI compute infrastructure for training, fine-tuning, evaluation, and inference. Responsibilities include managing Kubernetes clusters, enabling CPU and GPU systems, optimizing scheduling and capacity, troubleshooting distributed infrastructure, and automating provisioning, upgrades, monitoring, and maintenance. The role partners closely with AI researchers and engineers to improve infrastructure reliability, scalability, performance, and developer productivity.

Lead the architecture and development of highly available cloud services for AI inference. Build Kubernetes controllers and platform capabilities for workload scheduling, scaling, recovery, deployment, and lifecycle management. Improve reliability, observability, performance, and resource efficiency through production readiness reviews and incident-driven improvements. Guide complex technical initiatives, mentor engineers, resolve infrastructure issues, and align architecture across AI compute, runtime, and product teams.

The Principal Engineer will lead the Digital Identity group, architect solutions for complex problems, and ensure operational excellence by establishing processes and mentorship for the team.

Lead design and prototyping of generative AI experiences for autonomy development; drive UX for Hivemind products; perform user research, collaborate with CTO and product leads, and deliver reference implementations and integrations across full-stack web and edge systems.

As a Senior Principal Engineer, you'll define and drive the technical strategy for customer experience platforms, lead architectural decisions, and mentor engineering teams to enhance customer and agent experiences.

Lead design and future architecture of DigitalOcean data centers, owning MEP, cooling and power topologies (air to 800VDC liquid rack-scale), run PoCs, support site selection, mentor engineers, and translate AI/ML hardware roadmaps into scalable, deployable global standards.

Build and operate AWS and Azure cloud platform foundations, including landing zones, multi-account structures, account vending, Terraform modules, guardrails, CI/CD, centralized monitoring, and configuration-drift remediation. Lead and mentor platform engineers, establish reference architectures and self-service patterns, review application designs, author architecture decisions, and represent the platform in governance forums. The role supports regulated environments, AWS GovCloud, and large-scale data center migration.

The Staff Engineer will lead the Benchmarking & Performance team, managing performance data across CoreWeave's global infrastructure, developing benchmarking strategies, optimizing MLPerf submissions, and collaborating with NVIDIA and the open-source community.

Provides technical leadership for Bluehost’s large-scale hosting platform. Sets architecture standards, designs Python and MySQL backend systems on Linux, modernizes Perl and cPanel integrations, and drives reliability engineering practices. Leads complex incident root-cause analysis, establishes AI-augmented delivery standards, mentors senior engineers, and shapes multi-quarter technical roadmaps across the organization.

Designs scalable software frameworks and production systems for high-performance computing, optimizing AI/ML model training and inference across compute architectures. Leads technical design reviews, benchmarking, telemetry, secure coding, and operational improvements. Develops enterprise agentic AI engineering workflows with governance, validation, auditability, security, and resiliency guardrails. Mentors engineers and drives adoption of HPC, AI/ML, and automation practices across teams.

Own the architecture, product direction, and hands-on development of Phoenix’s payments infrastructure across processors, gateways, vaults, tokenization, wallets, routing, authorization, disputes, fraud, reconciliation, and reliability. Lead merchant and processor integrations, improve approval rates, manage payment-method portability, maintain PCI-compliant systems, and own incident response. The role combines principal engineering with payments product ownership, requiring direct customer engagement, roadmap decisions, technical design, coding, and accountability for business outcomes.

Leads architecture, design, development, deployment, and production support for complex enterprise software and cloud-native solutions. Advises strategic customers, resolves critical technical issues across application and infrastructure layers, shapes product direction, and drives engineering excellence through modern development practices. Mentors engineers, guides architecture decisions, and collaborates with product, QA, DevOps, SRE, and infrastructure teams. The role primarily supports HealthEdge’s healthcare claims administration platform and customer implementations.

Leads the technical vision and architecture for Remitly’s Core Transfer Experience organization. Responsibilities include modernizing high-traffic distributed systems, defining service and experience-layer boundaries, improving reliability and operational excellence, enabling AI-native experiences, guiding incremental migrations, setting technical strategy across teams, mentoring senior engineers, and contributing hands-on code and system analysis across backend, mobile, and web platforms.