Top Remote Senior Full-Stack Engineer Jobs in Seattle, WA

Build backend-focused Java/Kotlin APIs and data-driven product features, while contributing to React dashboards and workflows. Design scalable systems, participate in architecture and code reviews, troubleshoot production issues using observability tools, and collaborate with data, reporting, design, and product teams to launch emerging products.

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.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Build and own CRM features and workflow automations supporting sales, marketing, onboarding, and support. Develop full-stack functionality using Next.js, FastAPI, Inngest, and related technologies; partner with teams to automate workflows; create agentic solutions for enrichment and task automation; and manage features from planning through monitoring and refinement. The role requires strong web development expertise, product sense, autonomy, communication, and experience with modern JavaScript or TypeScript frameworks and orchestration tools.

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.

Leads end-to-end engineering across client engagements, including architecture, development, deployment, maintenance, and technical client relationships. Builds web applications, APIs, integrations, and CMS solutions while establishing development workflows, CI/CD pipelines, and engineering standards. Facilitates technical discovery, reviews code, manages technical debt, and evaluates AI-assisted development practices. Collaborates with designers, strategists, project managers, and QA while balancing quality, budgets, timelines, and evolving priorities.

Lead complex software projects and mentor engineers while building scalable full-stack products for Vanta’s expansion team. Develop purchasing, checkout, upgrade, renewal, billing, and trial experiences that support self-serve growth and revenue automation. Set technical direction, own product functionality and infrastructure, collaborate across teams, and contribute to engineering culture. The role uses TypeScript, React, and Node.js and involves greenfield development in a rapidly scaling startup environment.

Build and maintain Grafana Cloud integrations and observability features across frontend (TypeScript/React), backend (Golang), and monitoring mixins (Jsonnet). Ship end-to-end features, own projects to production, contribute upstream to OpenTelemetry/Prometheus, run on-call for owned services, and communicate designs and demos across teams.

Lead end-to-end design, development, and delivery of full‑stack features; drive architecture and code reviews; coordinate engineering work, write design docs and tests, and participate in Agile ceremonies. Must have blockchain/crypto experience.

Build end-to-end features in a JS/TS stack, designing scalable backend services and responsive real-time frontends. Improve observability, performance, and reliability, collaborate with product/design, and own full-stack implementation from APIs and data models to UI.

Lead architecture and implementation of scalable web applications using NestJS and Next.js. Build and optimize PostgreSQL schemas and queries, implement responsive UIs with Tailwind CSS, integrate LangChain-driven AI features, manage authentication with Clerk, and create end-to-end tests and automation with Puppeteer to ensure launch readiness and reliable user experiences.

Design, build, and own scalable multi-tenant SaaS applications across frontend, backend, and data layers. Improve system architecture, performance, reliability, and testing practices. Integrate AI-assisted tools, mentor engineers, conduct code reviews, and collaborate with Product and Design to deliver intuitive, production-grade software.

Build and optimize BizzyCar’s full-stack platform using Ruby on Rails APIs and Angular. Own features end to end, diagnose issues across UI, APIs, and data, guide architecture, mentor engineers, improve testing standards, and support multiple product domains including recalls, AI, and service systems.

Build and maintain full-stack applications for a maritime data management and AI platform. Responsibilities include developing frontend components, real-time WebGPU data feeds, PostgreSQL and Apache Iceberg data models, MQTT and Redpanda pipelines, Dagster batch workflows, machine learning integrations, and CI/CD tooling. The role supports mission-critical products used with U.S. Navy sonar and sonobuoy data.

Build and operate scalable, accessible, high-performance web experiences for Calendly’s marketing website and Help Center. Own projects from technical design through deployment and iteration, develop frontend architecture and CMS integrations, improve SEO, AEO, accessibility, Core Web Vitals, and reliability, and collaborate with Marketing, Content, SEO, Design, Product, and Engineering. Provide technical leadership through testing, code reviews, documentation, mentorship, and architectural improvements.

Own and evolve scalable distributed systems, REST APIs, backend services, and core product areas. Design solutions, improve resilience, reduce technical debt, and drive modularization. Use AI-first and agentic development practices, evaluate emerging AI tools, and help integrate AI across engineering workflows. Collaborate asynchronously with product, data, and go-to-market teams while improving engineering tools, processes, and system reliability.

Design, build, and optimize scalable cloud and web software with focus on infrastructure, performance, and hardware integration for IoT devices. Collaborate with hardware teams to ensure connectivity and high availability, implement new features, and improve system efficiency.

Lead the technical vision and delivery of high-performance APIs and patient and provider web experiences using Ruby on Rails and React. Collaborate with Product, Design, and Engineering to deliver scalable features, improve development and testing standards, and balance user experience with maintainable code. Responsibilities include backend API architecture, frontend performance, automated testing, deployment pipelines, on-call support, and protecting user data.

Build full-stack Real User Monitoring features across frontend applications, backend services, APIs, and analytical storage systems. Design high-throughput telemetry ingestion, storage, querying, data models, and indexing strategies. Develop data-heavy user interfaces, optimize performance and costs, collaborate with SDK and cross-functional teams, and own projects from design through deployment, monitoring, testing, and iteration.

Build and ship end-to-end product features across an author analytics dashboard, marketing site, free tools, billing, email, and AI-assisted functionality. Design data models and APIs, integrate third-party services, develop production LLM features, and maintain testing, monitoring, performance, and observability. The role includes code review, technical documentation, independent product decisions, and close collaboration with the founder in a remote-first environment.

Own fullstack development for Broad Arrow Auctions across customer-facing auction experiences and internal live-auction tools. Build scalable web applications, APIs, integrations, automated tests, and cloud infrastructure using Azure and AWS. Maintain Billboard auction software, integrate Microsoft Dynamics 365, monitor production systems, participate in on-call support, contribute to architecture, improve reliability and performance, and mentor less experienced engineers.

Build and scale full-stack applications, backend services, APIs, infrastructure, and user experiences supporting millions of users. Design reliable, high-performance systems; partner with Product, Design, and Data; own projects through deployment and optimization; improve observability and developer productivity; and support AI adoption through automation and AI-powered workflows.

Build and evolve scalable full-stack products using React, TypeScript, Next.js, Python, and Django. Own frontend and backend architecture, APIs, testing, CI/CD, observability, performance, and reliability. Collaborate with Product and Design, lead technical initiatives, identify risks, define solutions in ambiguous environments, and mentor engineers. Develop 0-to-1 experiences and production systems across cloud-based environments while establishing engineering standards and monitoring technical and product metrics.

Build and maintain full-stack features for Vanta’s third-party risk management products, including vendor onboarding, lifecycle management, monitoring workflows, data models, and platform abstractions. Write tested code, participate in reviews and architecture decisions, and collaborate with product, design, and engineering teams to deliver customer-facing functionality. Experience with TypeScript, React or Node.js, web applications, databases, and REST or GraphQL APIs is expected.

Lead development of secure, scalable digital banking software across front-end and backend systems. Design Angular or React applications, build APIs, optimize SQL performance, integrate third-party platforms, improve code quality, implement testing strategies, and mentor engineers. Collaborate with cross-functional teams in an Agile environment while supporting cloud-native practices, regulatory compliance, and continuous product improvement.