Top Full-Stack Engineer Jobs in Seattle, WA

Senior individual contributor who mentors junior engineers, leads complex projects, designs and tests moderately complex systems, creates APIs, debugs and monitors production services, and drives cross-team solutions and operational improvements.

Design, build, and operate high-throughput backend services and scalable APIs for insurance and fintech products. Lead cross-team initiatives across pricing, checkout, booking, and servicing systems. Launch zero-to-one products, iterate post-launch, write maintainable performant code, troubleshoot distributed systems, leverage AI-assisted development tools, and participate in quarterly on-call rotation.

Design, build, and operate full‑stack services and customer experiences. Implement frontend and backend code, own service lifecycle (testing, deployment, monitoring, incident response), collaborate with product and design, apply data‑driven prioritization, and safely integrate AI/ML capabilities to improve system reliability and user experience.

Build scalable, data-intensive products from the ground up, focusing on Java/Kotlin backend services, REST or GraphQL APIs, data access, and React/TypeScript interfaces. Responsibilities include architecture, performance optimization, testing, observability, production troubleshooting, technical documentation, and end-to-end feature ownership. Collaborate with data, reporting, design, and product teams while using AI-assisted development tools to accelerate delivery.

Develop fullstack web applications, enhance platform performance, collaborate on high-impact opportunities, and ensure stable, scalable solutions. Engage in rapid iterations and be a committed team player.

Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.

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.

Leads technical direction and develops fullstack purchase experiences using Ruby on Rails and Vue.js. Designs resilient transactional flows, integrates billing and CRM systems, improves reliability and rollout safety, mentors engineers, reviews code, reduces technical debt, and participates in incident response. Partners with Product, Design, Billing, and Support to improve GitLab’s purchase, subscription, discount, and upgrade workflows.

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.

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.

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.

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.

Lead the development and maintenance of large-scale distributed systems supporting e-commerce listings, fulfillment, settlements, and seller experiences. Collaborate with product, design, and engineering teams to establish architectural roadmaps, build resilient applications, test and debug software, improve platform performance, and drive innovation. Provide technical direction to junior engineers while delivering scalable, maintainable solutions for Rocket Growth programs.

Design, build, and maintain scalable, resilient distributed systems and customer-facing technology platforms. Collaborate across the software lifecycle, participate in architecture sessions and code reviews, improve engineering practices, define products, and support reliability, security, monitoring, cloud infrastructure, DevOps, and application deployment. The role requires experience with modern programming languages, cloud services, microservices, databases, and generative AI or LLM-based applications.

Own technical strategy and architectural decisions across multiple engineering squads. Design scalable distributed systems, APIs, data models, and cloud-native platforms while building shared systems that improve delivery. Partner with product and engineering leadership, resolve ambiguous technical challenges, establish AI-assisted development practices, and mentor engineers through design reviews and cross-team collaboration. The role requires full-stack expertise and strong influence, communication, and technical leadership in a high-stakes B2B SaaS environment.

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.

Build and maintain Pure1 Manage SaaS platform and web applications across frontend and backend. Develop subscription/commerce features, data pipelines, and ML-driven analytics. Use AI tooling for code generation, work with microservices, containers, Kubernetes, and collaborate with UX and stakeholders to take projects to production while owning testing, CI/CD, and code review.

Lead technical direction and delivery for the Acquisition & Onboarding full‑stack team. Build and maintain mobile (React Native/native) and web experiences, backend services at scale, and operational tooling. Drive architecture, mentor engineers, ensure reliability/monitoring/on‑call readiness, collaborate with product and design, and improve dev processes, testing, and release practices to impact conversion and retention.

Leads end-to-end full stack application development across user interface, application logic, and database layers. Owns requirements, solution design, coding, testing, documentation, deployment, troubleshooting, and performance improvements. Collaborates with program managers and business analysts, manages source control and CI/CD workflows, and mentors junior developers. The role also supports team development, knowledge sharing, and future broader leadership responsibilities.

Lead full-stack development for Aurora’s mapping systems, owning features from architecture through deployment. Build scalable backend services, geospatial data pipelines, and responsive WebGL web applications using React or Angular. Develop geometric algorithms, improve system reliability, influence technical roadmaps, mentor engineers, review code, and collaborate with operations and cross-functional teams to improve mapping workflows and autonomous fleet support.

Develop and ship full-stack web and mobile experiences across Affirm’s consumer app and website. Collaborate with product, design, analytics, and engineering teams to break down projects, make technical decisions, write tested and extensible code, launch scalable APIs, monitor service health, support on-call operations, review code, and participate in team development and interviewing.

Provides technical leadership for AI Trust and Governance engineering, designing scalable cloud-native services and distributed systems. Responsibilities include architecture, systems programming, concurrency, testing, debugging, deployment, release management, cross-team collaboration, and mentoring engineers. The role requires strong Java or C skills, expertise in distributed systems and consensus algorithms, and ownership of enterprise platform features from design through delivery.

As a Fullstack Engineer, you'll design, build, and operate web applications, collaborating with product teams and mentoring peers while ensuring best practices in coding and system architecture.

Design and implement full‑stack, low‑latency web-based Ground Control Station and C2 systems (map-centric UIs, real-time telemetry, video streaming), lead architecture and APIs, mentor engineers, support field tests and mission deployments, and ensure interoperability with C2 standards.

Build and scale consumer-facing mobile and web applications and backend services. Own features end-to-end across frontend and backend, optimize databases and queries, integrate third-party APIs, implement algorithms for risk and transaction evaluation, improve reliability and CI/CD, and contribute to testing, monitoring, and internal tools to support customer operations.