Top Senior Software Engineer Jobs in Seattle, WA

Design, implement, and operate large-scale backend services (identity, friend graph, persistence). Collaborate across teams to evaluate trade-offs, ensure availability, scalability, and security, participate in incidents, and use AI tools to accelerate development while maintaining code quality and operational excellence.

Design and implement complex Android platform projects, drive long-term Android strategy, build core frameworks and tooling, collaborate with product/design and teammates, review code and document best practices, evangelize Android best practices and AI code-generation tools, and participate in on-call rotation to support production systems.

The Software Engineer will enhance the structured data storage layer in Superhuman Docs, ensuring database reliability, performance, and correct data handling under varying workloads. Responsibilities include improving table management, server-side query planning, and collaborating on formula and sync processes.

Build and operate privacy-preserving, high-traffic search services. Implement full-stack features, shape architecture, address tech debt, deploy and monitor services, participate in on-call rotation, and collaborate across product and engineering to release frequent updates.

The Back-End Engineer will design and build core platform services, operate production services, and work on AI-powered features while collaborating with cross-functional teams and mentoring junior engineers.

As a Front-End Software Engineer, you will build AI-powered interfaces, tackle complex design problems, and collaborate across teams to enhance user experiences. Responsibilities include mentoring, implementing responsive UI, and engaging with AI technologies.

Design and implement Android features from design through launch, optimize mobile UX and performance, perform code reviews, evaluate technical tradeoffs, and use AI tools to streamline development while maintaining security and production-quality code.

Lead full‑stack design and delivery of customer-facing web experiences (Browse, Navigate, Preview). Own architecture, APIs, data models, rollouts, observability, on‑call readiness, and cross-team alignment, using approved AI-assisted workflows while ensuring technical quality and reliability.

Develop and implement cloud-based microservices for supply chain workflows. Ensure scalability, reliability, and performance of backend services, while collaborating across engineering teams and establishing API contracts.

Lead design and delivery of scalable customer-facing features, services, and APIs that process real-time data and AI-powered insights. Build web experiences, contribute to LLM/AI workflows, ensure reliability through observability and rollout practices, and collaborate cross-functionally with Product, Design, ML, and platform teams.

Lead development and maintenance of high-performance React Native apps across iOS and Android. Improve architecture, manage RN upgrades, debug native modules, own automated testing and CI/CD, optimize performance and stability, and mentor engineers within cross-functional product pods.

Design, implement, and operate critical, highly scalable backend services (identity, friend graph, persistence). Collaborate across teams, ensure availability, scalability, operational excellence, and cost management. Build, test, debug, and participate in incident resolution while leveraging AI tools to accelerate development and maintain secure, production-ready code.

Design, implement, and operate scalable ads delivery backend services. Own serving-time systems, collaborate with Product/ML/Infra, ensure availability and efficiency, use observability and automation, and apply AI-assisted workflows to ship production-quality code and optimize platform architecture.

Design and implement scalable backend systems for search and conversational AI. Build and productionize services leveraging LLMs, embeddings, and vector search. Lead architecture, mentor engineers, drive cross-team initiatives, and improve developer productivity and operational excellence.

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.

Lead UI architecture and design for responsive web applications; build reusable components with Angular/React/Vue and TypeScript/JavaScript; integrate UIs with RESTful microservices; enforce accessibility, security, testing, and CI/CD standards; mentor developers and collaborate with UX, backend, and DevOps teams in Agile environments.

As a Video Engineer at Whatnot, you'll enhance the platform's video services, develop seller tools, and implement innovative video strategies to improve user engagement and experience.

Design and implement CIAM backend services for authentication and authorization. Integrate identity systems, manage secure flows, and automate infrastructure.

The Senior Software Engineer will design and support Kubernetes infrastructure, develop applications in Go, and enhance platform reliability, performance, and observability in CoreWeave's AI-focused environment.

As a Billing & Analytics Software Engineer, you'll design and maintain the billing pipeline, integrate billing systems, and develop customer-facing analytics dashboards to support revenue recognition and operational observability.

Lead engineering efforts for the API Marketplace: design and build scalable, secure cloud-native microservices (Java/Spring Boot), advise cross-functional teams, mentor developers, drive technical standards, assess AI risks, and collaborate with product and senior leadership to deliver production-grade API solutions.

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.

Lead development and reliability of frontend platform infrastructure powering ~30 React apps. Build and maintain build tooling, testing frameworks, CI/CD pipelines, and developer experience integrations. Design and integrate generative AI tooling to automate tasks, reduce toil, and boost productivity across frontend teams while collaborating with stakeholders to address technical debt and scalable solutions.

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

As a Staff Software Engineer, lead the architecture and operation of GPU-driven infrastructure, focusing on automation, reliability, and scalability while mentoring engineers and collaborating across teams.