Top Senior Full-Stack Engineer Jobs in Seattle, WA

Build and operate customer-facing cybersecurity product capabilities across backend services, APIs, and modern frontend applications. Own moderate-to-large projects from scoping through rollout, contribute to architecture and technical standards, write tested and maintainable code, and collaborate with Product, Design, and engineering teams. The role is approximately 80% backend and 20% frontend, with responsibilities including mentoring engineers, addressing technical risks, improving observability and reliability, and delivering scalable cloud-native systems.

Designs and ships full-stack features across Angular, PHP/Symfony, Go, and MySQL. Responsibilities include architecture, data modeling, API design, testing, code reviews, technical design leadership, mentoring engineers, AI-assisted development, production support, incident investigation, and systemic improvements. The role is fully remote in the US and collaborates with global engineering teams.

Build Nango’s developer infrastructure platform across backend services, APIs, runtimes, dashboards, SDKs, CLI, MCP, and web applications. Own product surfaces end to end, work directly with customers, shape product and technical roadmaps, design reliable systems, and maintain open-source projects. The role requires strong backend fundamentals, TypeScript experience across Node.js and React, product ownership, developer empathy, communication, and autonomy in a remote startup environment.

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.

Senior Full Stack Engineer responsible for taking over an existing software project, completing unfinished features, resolving bugs, improving frontend and backend systems, integrating APIs and databases, refactoring for reliability and scalability, and preparing the application for production. The role requires independent ownership, strong debugging and software development skills, collaboration with stakeholders, automated testing, deployment workflows, and clear technical documentation.

Build and evolve scalable full-stack systems for People Data Labs’ APIs, self-serve products, and customer success tools. Responsibilities include designing frontend and backend architecture, developing React and Python applications, ensuring data integrity, implementing reliable APIs, optimizing performance, operating production services, collaborating with stakeholders, writing technical designs, mentoring engineers, and improving development practices.

Build and maintain full-stack features for a security infrastructure platform, expand PKI, PAM, and KMS products, work directly with enterprise customers, and explore AI applications in secrets management. The role requires strong JavaScript ecosystem expertise, particularly React, Node.js, and TypeScript, with optional Go and developer tools experience. This is a primarily remote role requiring work during US hours.

Build, test, review, deploy, monitor, debug, and maintain full-stack software used in K-12 classrooms. Work primarily with React, TypeScript, Node.js, and AWS while improving complex codebases and service design. Participate in incident response, refactoring, code reviews, pairing, mentorship, and cross-functional collaboration with product, design, and education experts. Use AI tools thoughtfully and prioritize reliable, accessible, and equitable learning experiences.

Build and maintain enterprise workforce management software for forecasting, scheduling, adherence, intraday management, and reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, integrations, and PostgreSQL data models. Support cloud-native deployments, CI/CD, testing, performance optimization, production troubleshooting, architecture discussions, and client-facing collaboration.

Build enterprise-scale workforce management software covering forecasting, capacity planning, scheduling, adherence, intraday management, and operational reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, integrations, and PostgreSQL data models. Contribute to cloud-native deployments, CI/CD, testing, performance optimization, architecture, production support, and client-facing technical collaboration.

Develop and debug production-grade full-stack applications across front-end and back-end systems. Build features, APIs, databases, and data models; troubleshoot end-to-end issues; analyze unfamiliar codebases; translate implementations across programming languages; and review AI-generated and developer-written code for correctness, security, scalability, performance, and maintainability.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Develop firmware, backend systems, and tooling for cellular IoT devices. Responsibilities include C development for STM32 microcontrollers, embedded AI integration, cellular communication, low-power optimization, device debugging and validation, and backend development with Python and Ruby on Rails. The role collaborates with hardware, electronics, and manufacturing teams and requires independently leading complex development initiatives.

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.

Develop and deploy responsive full-stack web applications from design through production. Translate product requirements into high-quality software, maintain pixel-perfect design standards, collaborate with product, design, and QA, and help guide technology strategy. The role acts as a technical lead on product initiatives and reports to the CTO, with a focus on AI-native development and secure fintech workflows.

Leads the design, development, and implementation of full-stack applications using C#, .NET, Angular, Azure, and SQL Server. Collaborates with cross-functional teams, ensures application security, performance, and scalability, applies Git-based version control practices, mentors developers, and stays current with emerging technologies.

Develop and operate authentication, authorization, and identity-provider services for APIs, customer products, and internal tools. Build Go backend services, gRPC/REST APIs, shared libraries, and React/TypeScript interfaces, with occasional Java work. Own services end to end, including data modeling, deployments, monitoring, troubleshooting, integrations, testing, incident response, and on-call support.

Designs, trains, evaluates, and operationalizes intelligent document-processing solutions using OCR, machine learning, LLMs, Python, and cloud data pipelines. Builds extraction, validation, reconciliation, exception-handling, and human-review workflows for sensitive information. Develops secure, auditable, configuration-driven systems with API integrations, monitoring, testing, CI/CD, and infrastructure as code. Partners with business experts to define document fields, quality thresholds, validation rules, and acceptance criteria.

Develop and maintain enterprise full-stack applications using Java Spring Boot, REST APIs, modern front-end frameworks, Oracle Exadata, and OpenShift/Kubernetes. Responsibilities include legacy code analysis, full-lifecycle development and testing, SQL and PL/SQL optimization, microservices deployment, CI/CD, code reviews, architecture discussions, monitoring, and Agile collaboration. The role requires an active transferable IRS MBI moderate-risk public trust investigation, U.S. citizenship, and substantial full-stack and cloud-native development experience.

Develop and enhance Grafana data source plugins integrating databases and third-party services. Support plugin reliability and operations in Grafana Cloud, integrate data sources with agentic workflows, improve processes, assist with customer escalations, and collaborate across the Grafana Division. The role requires full-stack software development using Golang and TypeScript, Kubernetes and microservices experience, robust coding practices, and participation in on-call and SRE operations.

Build and operate full-stack features across database, API, and front-end layers using Ruby on Rails. Own complex problems end to end, modernize legacy systems, design durable APIs, improve reliability and developer productivity, and participate in production support. Collaborate with product and engineering teams, document technical decisions, mentor peers, and contribute to architecture, code reviews, and on-call operations. The role also involves using modern developer tooling and working on scalable fleet and service-management software.

Design, develop, test, deploy, and support enterprise full-stack applications using React, Java/Spring Boot, and Python. Build secure APIs, microservices, integrations, chatbot interfaces, and cloud-native solutions. Work with Azure or AWS, Docker, Kubernetes, CI/CD pipelines, databases, messaging systems, and enterprise security practices. Collaborate in agile teams, participate in architecture discussions, refine requirements, conduct code reviews, and maintain quality through automated testing. Experience integrating AI or generative AI solutions is preferred.

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.

Join a small engineering team as a hands-on full stack developer. Accelerate frontend delivery, then take on backend services, infrastructure, and core capabilities. Own features from design through release and operational stability, collaborate with customer-facing engineers and founders, and promote effective AI-assisted development practices. The role requires strong backend-oriented full stack skills, product-launch experience, system design judgment, self-direction, and periodic travel to a California office.

Lead design, development, testing, and deployment of cloud-native full‑stack applications and microservices. Provide technical leadership, mentor engineers, implement CI/CD and automated tests, and drive modernization using GCP or similar cloud platforms, containers, and enterprise security best practices.