Top Senior Full-Stack Engineer Jobs in Seattle, WA

Develop and operate CrowdStrike’s internal cloud management platform and mission-critical CI/CD pipelines. Build APIs and UIs using Go and TypeScript, improve developer productivity, integrate tooling, maintain cloud-native infrastructure, and support secure, highly available software delivery systems. Collaborate with development, infrastructure, security, and SRE teams, ensure SOC2-aware processes, and participate in on-call operations.

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 web and mobile experiences across Affirm’s consumer products. Break down projects, collaborate with product, design, and analytics teams, develop scalable APIs, write well-tested code, monitor service health, participate in on-call support, review code, and contribute to engineering growth and interviewing.

Design and govern production-grade AI agent platforms, integrating agents with CreatorIQ through APIs, data connectors, and custom MCP servers. Build scalable React/TypeScript frontends and Node.js/Python backend services, implement enterprise safety and governance guardrails, and create agent discovery and evaluation experiences. Support client-facing technical discussions, analyze monitoring feedback, and advise on cloud infrastructure and database strategies. The role requires extensive full-stack engineering, distributed systems, cloud, and production AI agent experience.

Design, implement, and maintain scalable serverless backend services and responsive Next.js front-end components. Build data scrapers and integrations, improve CI/CD and IaC, mentor junior engineers, and collaborate with product and clients to solve complex compliance problems.

Lead design and delivery of full-stack basketball scoring, statistics, and postgame features. Build scalable backend services and APIs with TypeScript and Node.js, develop React web experiences, support iOS and Android products, and make architectural decisions. Collaborate across product, design, and engineering teams, ensure code quality and system reliability, mentor peers, and contribute to technical standards and tools.

Design and build scalable, cloud-native services for Salesforce’s AI Trust and Governance organization. Provide technical leadership across architecture, distributed systems, systems programming, and platform innovation. Lead features end to end, solve scalability challenges, develop comprehensive tests, debug defects, support releases, and mentor engineers through design and code reviews. Collaborate cross-functionally with engineering, product, architecture, and platform teams.

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.

Lead hands-on full-stack engineering for Minecraft, building accessible and secure user interfaces, application logic, APIs, services, and data integrations. Establish engineering standards, mentor teammates, conduct design and code reviews, and improve reliability through testing, CI/CD, observability, telemetry, and performance work. Collaborate across design, product, and engineering to deliver maintainable software from early exploration through live operation.

Build and operate a new full-stack fleet payments and expense management platform. Responsibilities include architecture, backend services, APIs, web and mobile capabilities, payment workflows, partner integrations, testing, observability, security, production readiness, and continuous improvement. The role collaborates with product, design, security, and distributed engineering teams while mentoring engineers and establishing scalable development practices.

Lead the design, development, and implementation of resilient pricing tools using Python and cloud technologies. Improve automation, deployment reliability, testing, documentation, and technical standards. Coordinate complex projects, research new development practices, identify technical blockers, and mentor junior developers. Collaborate with stakeholders while developing expertise in insurance pricing and supporting applications built with technologies such as Streamlit, Flask, Docker, Kubernetes, and cloud compute.

Deploys, configures, integrates, and operates Databricks and enterprise cloud data infrastructure for HUD. Automates infrastructure through IaC, scripting, APIs, and CI/CD; configures security, identity, access, compute, storage, and Unity Catalog. Supports data pipelines and Databricks applications, troubleshoots platform and integration issues, documents procedures, collaborates with cloud, cybersecurity, DevSecOps, and application teams, and provides technical leadership.

Senior full-stack engineer responsible for owning mission-critical software from requirements through deployment and sustainment. The role involves working directly with government users and technical stakeholders, architecting and building products across the stack, integrating with government IT systems, and ensuring security and compliance within DoD environments. The engineer will make product and architectural decisions, support technical proposal artifacts, and travel up to 50% to engage with mission owners in the field.

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.

Design, develop, and maintain scalable web services for a B2B SaaS application. Write tested code primarily in Go, manage PostgreSQL schemas and queries, and research AI-powered tools for software development and CI/CD optimization. Collaborate with product, design, and engineering teams to deliver user-focused solutions. Mentor engineers, promote best practices, and contribute to technical excellence.

Lead end-to-end development of scalable web applications using Node.js, React, MongoDB, and Google Cloud. Build analytics, identity resolution, personalization, integrations, and advanced visualizations using AI-assisted, spec-driven workflows. Develop LLM integrations, configure AI agents, maintain MCP servers, automate testing and CI/CD, and support observability. Serve as a Feature Lead by guiding architecture, technical specifications, documentation, and cross-functional communication.

Lead a small engineering team while building production-grade frontend and backend systems. Design GraphQL and REST APIs, develop React and Node.js applications, support data ingestion and ETL workflows, and own cross-domain technical initiatives. Drive Agile execution, delivery tracking, architecture, testing, performance, and engineering quality. Mentor engineers, collaborate with Product stakeholders, and use AI-assisted development tools to improve delivery efficiency.

Build and maintain scalable full-stack products and services in an agile team. Design, develop, test, deploy, and debug backend services, APIs, frontend applications, data services, and integrations. Collaborate with product management and customers, write automated tests, support production systems, and balance rapid delivery with maintainability. The role requires backend and frontend expertise, database knowledge, API design experience, modern development tooling, and experience integrating AI tools into software development.

Architect, develop, and maintain full-stack frontend applications and backend services for Alpaca’s internal trading tools. Build user-facing features, design APIs, work with financial-market infrastructure, own projects from design through deployment, collaborate cross-functionally, and mentor engineers. The role requires strong systems programming, TypeScript/React, SQL, relational database, REST API, WebSocket, and cloud-platform expertise.

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.

Build and operate scalable web applications and cloud services for secure, high-stakes digital assessments. Develop React, TypeScript, Node.js, and AWS features; create serverless and container-based systems; maintain infrastructure as code and CI/CD pipelines; write automated tests; troubleshoot production issues; and improve performance, reliability, and security. Collaborate in Agile teams, contribute to architecture and documentation, and mentor junior developers.

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.

Design, build, deploy, and maintain full-stack applications spanning frontend interfaces, backend services, APIs, databases, integrations, and cloud infrastructure. Own complex systems, improve reliability and technical debt, make architectural decisions, mentor engineers, and contribute to code reviews and engineering practices. Evaluate AI-assisted development opportunities and collaborate with product teams, stakeholders, and customers to deliver secure, maintainable software capabilities.

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.