Top Full-Stack Engineer Jobs in Seattle, WA

Design, build, and operate full‑stack services and customer experiences. Own system and API design, implement frontend/backend code, ensure observability and reliability, collaborate cross‑functionally, apply data‑driven decisions, and safely integrate AI/ML capabilities.

Build and operate high-throughput backend services, scalable APIs, pricing engines, and data models for insurance and fintech products. Lead cross-team initiatives, launch 0→1 products, improve system reliability and performance, troubleshoot distributed systems, and participate in quarterly on-call rotations.

Design, build, and operate scalable, secure checkout services and web applications. Own end-to-end feature delivery, diagnose production incidents, improve reliability, and collaborate across teams. Integrate AI/ML-enabled solutions and ensure strong testing, observability, and operational excellence.

Embedded SRE focused on building self-service reliability infrastructure and observability across the full stack. Responsibilities include implementing end-to-end APM/RUM and tracing, operationalizing AI gateway monitoring and guardrails, integrating AI for incident diagnosis, advising teams on resilient architecture, and modernizing observable CI/CD pipelines. Role may include on-call rotation.

Lead design and delivery of end-to-end, high-value customer experiences across web, mobile, and backend. Build scalable, observable distributed systems, partner with product and design, mentor engineers, and operate AI-natively to meet strict availability and latency SLOs.

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.

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.

As a Full-Stack Engineer at Superhuman, you will develop core product features, infrastructure, and collaborate with teams to enhance user experience, focusing on both front-end and back-end services.

As a Fullstack Software Development Engineer, you will build reliable features for high-value customers, collaborate across teams, and mentor juniors while ensuring system performance and availability.

Design, develop, and maintain full-stack web applications hosted in the cloud. Implement front-end UIs, build backend APIs interacting with cloud services, containerize apps, collaborate with infrastructure engineers, follow Agile and DevSecOps practices, and contribute to extensible, object-oriented codebases.

Build reusable, scalable front-end and full-stack features (React Native, TypeScript, Go/Java/Kotlin, AWS). Rapidly prototype, collaborate with product/design/analytics, contribute to architecture, code reviews, mentoring, and deliver highly reliable, customer-centric remittance experiences.

Build and evolve Circle Discover marketplace features: high-converting purchasing flows, algorithmic recommendations, content feeds, and listings. Work across a Ruby on Rails backend and React/Next.js front-ends, optimize performance and SSR/SSG, collaborate with designers and leaders, and improve codebase quality while shipping at pace in a distributed remote team.

Develop and deliver production-ready web experiences for marketing using React, Gatsby, and Tailwind. Build API integrations, maintain a lightweight codebase and design-system components, ensure accessibility, performance, SEO, and multi-region support, participate in code reviews, and help shape tooling and best practices across the team.

As a Senior Software Engineer, you'll implement collaboration features, support team architecture, work across tech stacks, and improve developer experience.

The Staff Software Engineer will lead full-stack initiatives, improve system quality, drive technical direction, and mentor peers in a collaborative environment.

The Senior Software Engineer will design, develop, and optimize scalable PHP APIs and web applications, collaborating with product and design teams to support product development and implement best coding practices.

Design and build tools and automations to deploy and manage CrowdStrike's cloud infrastructure. Collaborate with cross-functional partners to deliver reliable full-stack solutions using React and Go, integrate REST/GraphQL APIs, implement CI/CD and automated tests, emphasize security and documentation, and leverage AI to improve workflows and decision-making.

Senior full‑stack engineer building customer‑facing web, mobile, and backend systems to grow US remittance business. Lead technical design, deliver scalable, observable services, use AI tools, mentor teammates, participate in on‑call rotation, and collaborate with product, design, and analytics to improve high‑value send experiences.

Design, build, and optimize full-stack mobile and desktop web applications. Implement user interfaces, contribute to shared libraries, log and analyze metrics, use AI tools to accelerate development, and maintain high standards for code correctness, security, testing, performance, and scalability.

Build end-to-end fullstack features for a mental healthcare platform: design APIs and UIs, manage clinical and practice-management systems, integrate AI capabilities, and own product outcomes from schema to frontend.

Headway seeks a Staff Fullstack Engineer to own end-to-end product work across frontend and backend. You’ll build practice management, patient/provider engagement, AI-enabled clinical systems, onboarding, growth tools, and platform foundations. The role requires technical leadership, cross-functional strategy, mentoring, and shipping scalable, reliable systems in a complex healthcare domain.

Lead architecture, modernization, and development of Group Insurance applications. Modernize mainframe monoliths into Java microservices and micro-frontends on cloud, mentor distributed Agile teams, collaborate with enterprise architecture, product owners and infrastructure, and enable test automation and integrations. Approximately 10% domestic travel.

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.

Build and own Eve's marketing site and GTM engineering stack: integrate and optimize external tools, design AI agents for sales and marketing, implement webhooks and middleware to sync product/CRM data, and create programmatic campaigns and internal tools in partnership with Marketing, Sales, RevOps, and Product to drive growth and automation.

Lead frontend-leaning full-stack implementation work for carrier and enterprise integrations: architect reusable UI and API layers, author RFCs, guide technical delivery, enforce testing and security best practices, and partner with cross-functional teams to scope and ship production integrations.