Top Senior Software Engineer Jobs in Seattle, WA

Design, build, scale, and maintain CoreWeave’s IAM platform and distributed identity, authentication, and authorization services. Develop APIs and backend systems, optimize performance and availability, implement observability and automated tooling, and participate in on-call operations. Collaborate with product, design, and technical program teams on strategy and roadmap. Apply software engineering best practices, automated testing, CI/CD, security principles, and production troubleshooting to deliver maintainable, reliable cloud infrastructure services.

Design, build, and operate highly available, low-latency distributed services for Expedia’s pricing and marketplace infrastructure. Own systems end-to-end, including architecture, APIs, data modeling, implementation, testing, deployment, monitoring, and production support. Drive technical direction, improve reliability and performance, collaborate across teams, and mentor junior engineers. The role involves large-scale systems, microservices, CI/CD, observability, incident response, capacity planning, and resilience engineering.

Build and operate secure, resilient distributed systems for secrets and key management across Cloudflare’s global network. Re-architect internal PKI and machine or workload identity systems, participate in on-call incident response, support internal developers, and advise engineering teams on secure system design. The role requires software development, distributed systems expertise, Linux/UNIX administration, and hands-on security implementation experience.

Build Apollo’s AI-powered Builder Studio end to end, including chat-driven app creation, live previews, generated-app runtimes, workflows, integrations, delegated permissions, security, and reliability. The role requires strong full-stack development, production LLM experience, frontend expertise with complex UIs, backend and workflow design, and ownership of an ambiguous 0-to-1 product.

Design and lead backend services for Metropolis’s incentive and rewards platform. Build real-time event-driven systems, compliance and preference services, personalized decisioning frameworks, identity systems, attribution tools, and scalable eligibility and partner configuration services. Collaborate with Product, Marketing, and Data on the technical roadmap, mentor engineers, lead technical discussions, and manage the full software development lifecycle through production deployment.

Designs and operates scalable Managed Database control-plane and infrastructure systems for PostgreSQL and MySQL workloads. Responsibilities include architecture, implementation, performance optimization, resiliency, automated failover, backups, point-in-time recovery, observability, and production on-call support. Leads cross-team technical projects, translates ambiguous requirements into designs, mentors engineers, conducts reviews, and improves reliability for high-concurrency, data-intensive, and AI-adjacent cloud workloads.

Build and own scalable full-stack mobility platform features across databases, backend APIs, and user interfaces. Collaborate with UX, product, and engineering teams to deliver high-quality experiences for high-throughput environments. Lead projects from inception through production, improve performance and reliability, champion engineering best practices, mentor junior engineers, and evaluate tools and frameworks for continuous platform improvement.

Design, build, and operate MongoDB Atlas features and distributed backend systems, with a focus on encryption, compliance, customer-managed keys, and cloud security across AWS, Azure, and GCP. Lead complex technical projects and fleet-wide production rollouts, collaborate with product, design, customers, and support teams, mentor engineers, resolve production issues, and participate in on-call support.

Build and maintain authentication and fine-grained authorization systems using Auth0 and OpenFGA. Own OAuth 2.0 and OpenID Connect implementations, identity federation, token flows, and permissions for AI agents. Lead cross-team technical projects, set engineering standards, review code, and mentor engineers. The role requires strong backend development skills and experience with identity providers, ReBAC systems, and complex multi-tenant authorization models.

Develop and scale backend Java and Kotlin software powering patch discovery, packaging, and deployment across millions of endpoints. Design scalable systems, APIs, data structures, caching solutions, and relational databases while maintaining high testing and code-quality standards. Collaborate with AI workflow, server, platform, design, and product teams. Occasional React or Angular work may support patching workflows and dashboards.

Designs and evolves AWS infrastructure as code using CDK, develops backend software primarily in TypeScript, and applies secure engineering practices for regulated environments. The role contributes to architecture, code reviews, CI/CD pipelines, production support, observability, and on-call operations. It collaborates cross-functionally, builds scalable and reusable systems, supports SOC 2 compliance, and uses AI coding assistants to improve development, testing, and documentation.

Develop and maintain C#/.NET software for electric and gas distribution engineering tools. Implement features, fixes, integrations, tests, and CI/CD automation while configuring enterprise systems for customer needs. Collaborate in Scrum, participate in reviews, reduce technical debt, document processes, and mentor teammates. The role may involve GIS or Enterprise Asset Management integrations and requires strong software development experience in utility or energy infrastructure environments.

Lead internationalization engineering across Remitly’s global products. Build AI-powered translation tooling, localization pipelines, and frontend/backend i18n frameworks supporting multiple languages, scripts, and locales. Establish technical roadmaps, quality standards, and scalable translation practices while partnering with Localization, Product, Design, Legal, Marketing, and engineering teams. Mentor engineers, improve legacy systems, support RTL and bidirectional languages, and deliver locale-aware formatting and transliteration capabilities.

Build and scale full-stack software for employer and Employee Assistance Program products, including employer portals, patient and provider workflows, eligibility, authorization, and billing. Lead technical projects, design secure distributed systems, mentor engineers, contribute to engineering culture, and use modern technologies and AI-assisted development tools. Collaborate cross-functionally to expand access to mental healthcare.

Build and ship web-based transportation management software for trucking customers. Collaborate with product, UX, and engineering teammates to understand user workflows, solve domain problems, deliver features rapidly, and maintain an effective balance between quality and velocity. The role requires proactive ownership, strong communication, frequent collaboration, and willingness to learn the trucking industry and engage with customers.

Design and deliver Android system applications for Toast POS devices, including device policy enforcement, setup, firmware and app updates, background services, and fleet deployment. Lead technical design, cross-functional planning, Android and hardware upgrades, automated testing, production issue investigations, and staged rollouts. Mentor engineers and collaborate with product, hardware, QA, and software teams to build secure, reliable device-management systems.

Own and deliver backend lakehouse infrastructure goals, lead engineers through complex problems, and build highly available distributed data systems. Collaborate with product, design, analytics, and engineering stakeholders; define scalable technical solutions; improve code quality and engineering standards; monitor operational health; support on-call responsibilities; and mentor team members.

Design and scale foundational APIs and backend services for LogicGate’s multi-tenant GRC platform. Build distributed systems using Java/Kotlin, Spring Boot, AWS, databases, caching, and messaging technologies. Improve reliability, observability, performance, testing, and CI/CD practices. Lead technical design reviews, collaborate cross-functionally, mentor engineers, and use AI coding tools to improve development efficiency.

Build and operate security infrastructure for MongoDB Atlas across AWS, Azure, and Google Cloud. Responsibilities include hardening Linux hosts and containers, implementing cloud security controls, workload identity, vulnerability management, Infrastructure-as-Code, runtime threat detection, and monitoring systems. The role leads initiatives from threat modeling and architecture through deployment and long-term production reliability.

Build and operate scalable, reliable full-stack systems for high-value international money transfers across web, mobile, and backend services. Lead architecture for complex customer experiences, meet strict availability and latency goals, use AI-native development practices, collaborate with product and design teams, and mentor engineers while strengthening coding, testing, observability, and system design practices.

Develop and maintain scalable SaaS solutions for financial reporting and capital markets customers. Responsibilities include full-stack development, system design, testing, monitoring, performance optimization, security, technical debt reduction, and collaboration with product managers, developers, and SRE teams. The role requires building reliable, secure, maintainable data-driven applications and contributing across the software development lifecycle.

Build GitLab code security capabilities spanning dependency analysis, SBOM and lockfile parsing, vulnerability detection, AI-assisted analyzers, and automated dependency remediation. Design evaluation harnesses, package analyzers for CI and AI workflows, improve security report accuracy, and extend ecosystem coverage. Own initiatives from design through delivery, mentor engineers, collaborate across product and engineering teams, document systems, and participate in on-call support.

Lead technical direction and build full-stack AI voice-agent experiences for drivers. Design agent behavior, memory, context sharing, orchestration, arbitration, APIs, and service boundaries. Ship products from concept through production, evaluate AI behavior in real-world use, document architectural tradeoffs, mentor engineers, and establish AI-assisted engineering practices using tools such as Codex, Claude Code, and Cursor.

Build and operate full-stack applications and AI-facing features for CoreWeave’s internal data platform. Responsibilities include developing TypeScript, React, Next.js, and Python services; designing APIs and relational data models; integrating analytical data platforms; deploying on Kubernetes; and owning production reliability, testing, observability, and on-call support. The role also involves collaborating with non-engineers to define processes, shipping LLM-backed applications, and evaluating AI output quality.

Lead architecture and development for a new Provider Onboarding engineering domain. Build scalable full-stack, database-backed applications and microservices supporting pricing, payments, client panels, forms, and provider workflows. Mentor engineers, establish design patterns, drive cross-functional delivery across the full software lifecycle, and improve operational reliability for a healthcare platform.