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

Develop and maintain full-stack features for CMS’s Unified Case Management system. Responsibilities include building Java and Spring Boot backend services, APIs, data models, Angular or React interfaces, database interactions, and automated tests using test-driven development. The engineer will optimize performance, scalability, security, and data integrity; collaborate on system design and integration; reduce technical debt; and support teammates in a remote-first environment.

Designs, builds, and scales full-stack web applications using React, TypeScript, Python, and AWS. Develops APIs and backend services, optimizes relational and document databases, implements automated testing, and manages Docker-based deployments and CI/CD pipelines. Collaborates with technical and non-technical stakeholders, translates business requirements into production-ready solutions, communicates clearly, and mentors colleagues while promoting strong engineering practices.

Build and ship full-stack features, including REST APIs, single-page applications, data models, cloud-based containerized services, and relational database solutions. Translate product requests into deliverable work, contribute to architectural decisions, review pull requests, and protect patient data by maintaining strict PHI-handling practices. Work in a trunk-based development environment with short-lived branches, frequent releases, and continuous collaboration.

Build and own a multi-tenant web platform for managing AI infrastructure. Develop Next.js and React features, server-side authentication and API proxying, generated TypeScript SDKs, resilient data synchronization, design-system components, accessibility, performance, testing, observability, and production deployment. Collaborate with backend and globally distributed teams, review code, troubleshoot production issues, and mentor junior engineers.

Senior Full Stack Engineer building scalable, high-performance web applications. Own feature design through delivery, write clean reusable code, optimize databases, work with CI/CD, containers, cloud, distributed systems, mentor teammates, and maintain zero customer-reported bugs.

Build and maintain full-stack software for startup clients, including backend services, frontend experiences, new features, redesigns, bug fixes, and product improvements. Collaborate daily with product managers, designers, and engineers in a distributed, agile environment. Take ownership across the technology stack, write clean maintainable code, contribute to client missions, and support team growth and knowledge sharing.

The Senior Fullstack Software Engineer will design, implement, and maintain features for Conveyor's SaaS platform, involving both backend and frontend work, while collaborating closely with team members and mentoring juniors.

Design, build, and maintain AI-powered B2B SaaS products across frontend, backend, and AI. Own projects end-to-end, collaborate with product and design, ensure maintainability, mentor teammates, and inform roadmap and implementation decisions.

Designs, builds, tests, deploys, and optimizes full-stack product features using React and Python. Develops GraphQL integrations, scalable backend services, data visualizations, analytics instrumentation, and production-ready platform capabilities. Contributes to UX workflows, CI/CD, monitoring, code quality, and stakeholder updates while collaborating in agile sprints and evaluating new technologies.

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.

Build and own scalable fintech products end to end, partnering with product, design, and data teams. Design high-performance, event-driven systems, integrate AI models and autonomous agents, instrument features, monitor business outcomes, and optimize user experiences. Work across React, TypeScript, React Native, Laravel, PostgreSQL, and AWS while influencing technical strategy, architecture, and product decisions.

Build and scale backend-focused systems supporting truckload freight operations, including high-volume carrier quotes, automated transactions, distributed services, and APIs. Design scalable data models and architectures, contribute across the React and TypeScript stack, make key technical decisions, mentor engineers, and collaborate with product leadership. The role also involves developing AI-powered logistics tools and maintaining reliable, secure infrastructure on Kubernetes and GCP.

Owner of Vannevar's authentication and authorization platform: build tenant-isolated auth systems, self-service user/group/permission admin UI, tooling to visualize and validate access, feature-flag and platform management interfaces, and shared authorization capabilities across products.

Senior fullstack engineer to build and scale Brigit's consumer finance platform. Own end-to-end features across frontend (React/React Native/TypeScript) and backend (Java/REST/SQL), optimize database and APIs for high scale, integrate 3rd-party services, implement risk and transaction algorithms, improve CI/CD, testing, monitoring, and internal tooling to support millions of users.

Develop and maintain Java applications, RESTful services, and Angular frontends using Spring Boot and NgRx. Deploy applications to cloud platforms, practice TDD, manage CI/CD with Jenkins, and work with Oracle and PostgreSQL databases. Participate in agile processes, collaborate with cross-functional teams, mentor engineers, and independently lead technical initiatives and feature delivery.

Build and scale Geolava’s spatial intelligence products across frontend and backend systems. Design APIs, data models, and LLM agent workflows; own features from design through deployment, monitoring, and iteration. Collaborate with product, design, research, and engineering teams to deliver reliable, polished solutions. The role requires strong product judgment, autonomy, production Python experience, full-stack TypeScript and React expertise, cloud infrastructure knowledge, and familiarity with agent loops, RAG, MCP, and geospatial technologies.

Build and scale Calendly’s AI Notetaker and meeting recap platform. Responsibilities include developing features, designing service-oriented architecture, contributing to scaling initiatives, collaborating with Product and Design, reviewing code, improving engineering practices, participating in agile ceremonies, mentoring teammates, and supporting on-call operations.

As a Senior Software Engineer, you will design and build a cutting-edge identity search platform and implement AI systems for defense applications, working closely with cross-functional teams to enhance user workflows and support national security.

Design, develop, and support scalable full-stack, cloud-native applications using Next.js, TypeScript, .NET, Python, AWS, and Kubernetes. Build AI-enabled solutions involving generative AI, LLMs, intelligent assistants, RAG, and workflow automation. Collaborate with architects, product teams, and clients, contribute to architecture and Agile delivery, troubleshoot production systems, establish observability practices, review code, and mentor junior engineers.

Build and support consumer-facing full-stack features for an energy-saving platform. Responsibilities include developing TypeScript/React frontend and Python backend functionality, owning critical product flows, collaborating with product and analytics teams, working with cloud and database technologies, implementing UI and API monitoring, and participating in code reviews and agile development processes.

Develop and maintain scalable backend applications, microservices, APIs, integrations, and production-ready client-facing features. Ensure systems are secure, documented, tested, and performant while collaborating with product, engineering, and business stakeholders. Translate business goals into technical architecture, estimate scope and timelines, and contribute across the technology stack in a remote, cross-disciplinary environment.

Design, implement, and maintain cloud-native full-stack software to migrate, preserve, and make large volumes of government records searchable and accessible. Build Section 508-compliant frontends and secure backend APIs, follow API-first and CI/CD practices, defend against vulnerabilities, mentor engineers, and collaborate with cross-functional teams to deliver reliable, performant systems.

Responsible for leading a team of engineers, supporting product development, identifying technical issues, and ensuring high-quality code delivery in backend systems at scale.

Build and lead full-stack development for the Polaris platform using React, TypeScript, Django, Python, and PostgreSQL. Own features from architecture through deployment and production support, design secure APIs and integrations, improve performance and observability, maintain automated testing, mentor engineers, review code, and influence technical direction across squads.

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.