Top Senior Software Engineer Jobs in Seattle, WA

The role involves leading application performance improvements across multiple platforms, focusing on measurable metrics and driving engineering standards and workflow optimization, using both hands-on coding and strategic influence.

Design, build, and maintain scalable, reliable full‑stack systems. Contribute to API and architecture design, write testable code, debug complex issues, improve performance, automate deployments, and mentor junior engineers while collaborating with cross‑functional teams.

Design, build, test, and operate scalable services that ingest, store, and distribute lodging rates and availability. Own technical execution, contribute to system architecture, resolve production issues, and improve reliability through monitoring, automation, and operational excellence. Collaborate cross-functionally and safely integrate AI/ML-enabled solutions.

Own and develop distributed database systems powering R2, Durable Objects, and Workers KV. Implement features, ensure correctness via review and testing, tune performance, optimize data placement and replication across edge topology, and build observability and tooling to operate storage globally across Cloudflare's network.

The Principal Software Engineer will design and implement systems for the advertiser experiences at Snap, lead technical vision, mentor engineers, and innovate on creator marketplace products.

Senior backend engineer responsible for designing, building, and operating scalable, highly available services and APIs. Lead end-to-end implementation, influence architecture, mentor engineers, integrate AI/ML safely, and drive operational excellence through automation, observability, incident response, and continuous improvement.

Design and build backend services for receiver financial products, integrate with Remitly's money-movement platform, ensure security/compliance, operate services at scale with SLOs and on-call responsibilities, and mentor junior engineers while driving technical design and RFCs.

As a Senior Software Development Engineer in the ML Platform team, you'll design and build scalable ML platform capabilities, enhance software quality, improve operational health, and drive adoption of shared ML infrastructure across teams.

The Principal Software Engineer will design automated ad serving systems, lead technical direction, collaborate with teams, and mentor engineers.

Design and develop scalable backend services for the Falcon Risk Platform, ensuring performance and reliability. Collaborate with teams on cloud infrastructure, database management, and system optimization while mentoring junior engineers and driving technical initiatives.

Lead full‑stack design and delivery of customer‑facing web and mobile features across frontend and backend systems. Own architecture, ship reliable and observable services, mentor engineers, drive process and cross‑team designs, participate in on‑call rotation, and collaborate with product, design, and analytics.

As a Senior Software Engineer, you'll develop Go-based services for managing large-scale GPU data center infrastructure, focusing on automation, APIs, and monitoring tools.

Individual contributor software engineering role (IC4) at Microsoft. Posting lists U.S. base pay ranges (with higher SF/NYC ranges). Responsibilities and specific technical requirements are not included in the description.

The Staff Software Engineer will own user-facing product areas, lead initiatives across frontend and backend, and mentor team members to enhance product quality and engineering standards.

You will own frontend systems, lead initiatives in UX and performance, uphold standards, and mentor engineers to enhance quality.

The Senior System Software Engineer will develop software tools for provisioning NVIDIA chips, coordinate tool lifecycles, and collaborate with various teams.

The Software Engineer will build and scale Ads Manager, develop APIs and tools for campaign management, and ensure systems uphold safety and privacy standards.

Build and maintain large-scale, AI-enabled solutions to automate marketing planning and operations. Design, implement, and test reliable, secure, and scalable systems; apply AI-native engineering practices, telemetry, and feedback to optimize performance and user outcomes. Collaborate with stakeholders to deliver impactful features and promote engineering best practices across the team.

Early-stage full-stack engineer to build a 0-1 procurement platform: develop front-end and back-end, ship prototypes with great UI/UX, implement API and ERP integrations, design cloud infrastructure, lead technical strategy, and work directly with initial customers.

Design, build, and operate globally distributed storage systems; own code from design to release; provision and benchmark storage hardware; model failure domains; build observability, runbooks, and automation; collaborate across teams to ensure reliability, performance, and scalability.

Design and build a proto-driven code-generation pipeline to emit Go SDKs, CLI commands, and Terraform resources. Own API service framework components end-to-end, enforce API standards, collaborate with teams on API design, improve developer experience, and mentor engineers.

Build and operate Go-based backend services and APIs to manage hardware lifecycle (RMA, data center operations, node repairs). Design scalable, reliable microservices, integrate vendor APIs, manage databases for operational and reporting use cases, and deploy/operate services on container platforms.

As a Senior/Lead AI Software Engineer, you will develop intelligent agents for supply chain tasks, drive architectural decisions, lead technical strategies, and collaborate across teams while mentoring engineers.

As a Senior Full Stack Software Engineer, you will design, build, and operate services and user interfaces for Nordstrom's product data ecosystem, focusing on microservices and React applications to manage catalogs and data integrity.

As a backend engineer, design and develop features for AI tools, build real-time data pipelines, and ensure system reliability and performance.