Top Full-Stack Engineer Jobs in Seattle, WA

Join as the founding full-stack engineer to extend a TypeScript React/Next.js prototype, design product features, integrate AI/OCR, write tests and infrastructure, talk to users, and iterate quickly to drive growth.

Join as an early founding full-stack engineer to architect, build, and deploy a scalable platform serving AI-driven voice applications. You will own frontend and backend development, design infrastructure with the CTO, and deliver reliable production systems for enterprise customers.

Architect and develop a next-generation radar software platform using asynchronous Rust backend services, APIs, real-time data models, and React front ends. Advance algorithms and prototypes into high-performance, observable production systems designed for resilience, offline operation, security, and intermittent connectivity. Improve CI/CD, testing, instrumentation, and service reliability while collaborating cross-functionally, mentoring engineers, and influencing technical direction.

Build, maintain, and deploy a high-volume, fault-tolerant observability platform. Architect and develop OpenTelemetry-based systems, implement services in Go (concurrency/gRPC), work with ClickHouse/Postgres, Kafka/Redis streaming, and containerized deployments on Kubernetes/Docker. Evaluate new tools and improve platform reliability and performance.

Build and scale customer-facing full-stack platforms using React, TypeScript, Go, Java, Python, Node.js, and AWS. Develop APIs, microservices, distributed systems, databases, cloud infrastructure, and automated deployments. Participate in architecture and code reviews, testing, security, observability, CI/CD, and production troubleshooting. Collaborate with product and design teams, communicate technical decisions, mentor engineers, and independently deliver complex initiatives across distributed Agile teams.

Build and own end-to-end full-stack features across backend services and user-facing applications. Contribute to system design, reliability, performance, observability, and engineering practices while collaborating with product and design.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Design, build, and maintain cross-platform mobile applications and end-to-end web features. Implement front-end interfaces, back-end services and RESTful APIs, optimize databases, write tests and documentation, perform code reviews, and collaborate with UX, QA, and DevOps to deliver high-quality, secure, and performant solutions.

Build and maintain scalable full-stack features for Roo’s veterinary staffing marketplace. Develop across the React Native mobile app and backend services, contribute to architecture, write unit and end-to-end tests, resolve production issues, improve observability and reliability, and support CI/CD deployments. Collaborate cross-functionally with product, design, data, and engineering teams while mentoring junior engineers and driving technical improvements.

Build and own internal operational tools, client portals, dashboards, intake workflows, and responsive web experiences. The engineer will shape system architecture, scalability, user flows, and technical roadmaps while collaborating with leadership and an external development team. The role requires autonomous full-stack development, strong product judgment, clean interface design, and eventual ownership of the company’s database and internal systems.

Own full-stack modernization of complex federal legacy systems using Palantir as the target platform. Responsibilities include analyzing workflows, designing scalable applications, developing Java and Spring Boot backend services and APIs, building React-based user interfaces, integrating legacy environments, troubleshooting across application and data layers, and supporting the full SDLC. The role also requires stakeholder collaboration, code reviews, Agile delivery, and simplifying undocumented or inefficient processes.

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.

Own full-stack features for Techstars OS from data ingestion and APIs through React interfaces and production delivery. Build AI-native search, retrieval, and assistive workflows using founder and portfolio data. Lead migration and retirement of legacy tools, develop data pipelines, improve testing and CI/CD, and provide architectural guidance. The role requires strong autonomy, written communication, and end-to-end ownership across cloud infrastructure and product development.

Lead a four-week project to launch a production inventory table and artifact-detail experience for an AI security platform. Build frontend-heavy, data-dense workflows with large tables, filtering, paging, and resilient state management. Contribute across TypeScript, React, Next.js, Node.js, Postgres, REST APIs, and background jobs. Partner with technical and design leadership, review code, and potentially develop deduplication, reporting, and knowledge-graph features.

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.

Build and maintain a full-stack platform across web UI, APIs, databases, tests, documentation, media pipelines, and cloud or edge deployments. Design APIs for web and device clients, develop large-file data integration pipelines, and improve testing, recovery, data integrity, and observability. Own the full software development lifecycle and maintain a high-quality codebase.

The Senior Full-Stack Engineer will manage client relationships, design integration solutions, and ensure seamless delivery and optimization of technical workflows, while leveraging AI for efficiency.

Build and ship full-stack features for customer-facing Console and Playground, plus internal tools. Design and maintain APIs and backend services, implement accessible performant frontends, translate product requirements into incremental work, and improve code quality through reviews and design discussions.

Leads architecture and hands-on development of a cloud-native AWS platform using React, TypeScript, and backend APIs. Establishes platform-wide engineering standards, designs integrations across domain services, drives scalability, security, observability, automated testing, and performance, and mentors engineers across multiple teams. The role also leads technical strategy, cross-team planning, code and design reviews, reliability initiatives, and communication with senior stakeholders.

Build and improve AssetWatch’s cloud-native industrial IoT SaaS platform across frontend, backend, APIs, and databases. Develop React and AWS features, create scalable and observable solutions, support production systems, improve reliability and performance, contribute to CI/CD and automated testing, and participate in design and architecture decisions. The role also involves secure software development, accessibility compliance, infrastructure automation, peer reviews, and responsible use of AI-assisted development tools.

Lead frontend and full-stack engineering, architect scalable features, integrate APIs and cloud services, optimize rendering and performance, establish engineering standards, conduct code reviews, and mentor developers. Collaborate with product, UX, and backend teams to deliver user-focused software while managing priorities in an ambiguous environment.

Develop and maintain full-stack web interfaces, backend scoring services, databases, and automated agents for cyber range environments. Responsibilities include architecture, coding, unit and integration testing, system validation, documentation, requirements analysis, and integration with versioned cyber ranges. The role requires collaboration across complex hybrid and multi-vendor environments, with a focus on cyber training systems, infrastructure automation, networking, virtualization, and Agile software development.

Develop and maintain full-stack web interfaces, backend scoring services, databases, and automated scoring agents for cyber range environments. Responsibilities include architecture, coding, unit and integration testing, documentation, system integration, and collaboration with RangeOS developers. The role requires work across Linux, Windows, virtualization, networking, cloud, hybrid, and multi-vendor environments, with participation in requirements analysis, solution design, Agile development, and cyber training platform integration.

Develop secure, scalable full-stack software for satellite ground communications and data transport. Responsibilities include building Python backend services and APIs on AWS, developing TypeScript and Vite front-end applications, designing microservices, managing PostgreSQL databases, implementing authentication and authorization, supporting containerized deployments, resolving production issues, refining requirements, collaborating with MBSE and test teams, and mentoring engineers.

Develop full-stack software for secure, scalable satellite ground communications platforms. Responsibilities include building Python backend services and APIs, designing TypeScript front-end applications, implementing authentication, authorization, microservices, databases, testing, and cloud deployments. The role involves collaborating with MBSE and test teams, translating requirements into technical designs, troubleshooting production issues, supporting integrations, and presenting engineering recommendations. Work requires maintaining secure, reliable systems for U.S. Government missions.