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# Senior Fullstack Software Engineer

- **Company:** LVT LLC
- **Location:** Seattle, WA, United States
- **Experience:** Expert
- **Salary:** $159,000.0 - $192,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Business Logic, Code Review, Continuous Integration, Data Integrity, Relational Databases, Software Debugging, DevOps, Human-Computer Interaction, MySQL, Node.Js, OAuth, OpenID, Next.js, Service-Oriented Architecture, Data Streaming, TypeScript, Web Applications, WebSocket, Network Routers, Real Time Systems, ReactJS, Backend, Containerization, Material UI, Graphql, Front End Software Development, Api Gateway, NestJS, Docker, Legacy Systems, Microservices
- **Published:** July 3, 2026
- **Apply:** https://www.seattlejobs.com/job.asp?id=3311054592&tx=VT6156TYT&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54

## About the Role

* 5+ Years of Professional Development Experience:
A proven track record building enterprise-grade applications, with a heavy emphasis on full-stack TypeScript architectures.

 * Frontend & Framework Mastery:
Deep production experience working with React and modern Next.js environments (including App Router and server actions).

 * Backend & API Expertise:
Strong command of Node.js (NestJS preferred) and hands-on experience designing schemas, resolvers, and subscriptions using Apollo Server or similar GraphQL ecosystems.

 * Data & Real-Time Systems Knowledge:
Proficiency with relational databases (MySQL preferred), query builders/ORMs (like Knex), and experience scaling real-time web applications using WebSockets.

 * Security & Infrastructure Fundamentals:
Solid understanding of modern authentication/authorization patterns (OAuth/OIDC, JWT) alongside familiarity with Docker, containerization, and modern CI/CD practices.

 * Problem Solver & Systems Thinker:
Exceptional analytical skills with the ability to dive into unfamiliar or legacy codebases, deduce business logic, and refactor effectively.

 * Compelling Communicator:
Strong interpersonal and collaboration skills, with an innate ability to lead cross-team design discussions and articulate technical strategies clearly to stakeholders.

## Description

As a Senior Fullstack Software Engineer at LVT, you will play a critical role in designing, building, and scaling software across our entire user interface surface area and the mission-critical backend services supporting it.

You will own features end-to-end-from building responsive React applications to optimizing our federated GraphQL subgraphs.
Working alongside a highly collaborative team, your engineering judgment will directly shape how enterprise customers interact with real-time IoT data and advanced automated workflows.

ROLE RESPONSIBILITIES

 * Deliver High-Quality Software End-to-End:
Design, build, test, and ship robust features across our full stack, ensuring code aligns with high-performance standards from UI components to backend REST and GraphQL services.

 * Cross-Service Architecture & Debugging:
Trace, isolate, and resolve complex, systemic bugs across service boundaries (UI, API gateways, subgraphs, and legacy codebases) to ensure seamless performance.

 * API & Data Integrity: Define clear data contracts between microservices, maintain schema federation hygiene, and architect secure, scalable real-time WebSocket data flows.
 * Promote Reliability and Performance:
Write and run comprehensive tests, instrument critical system metrics, and build operational dashboards to proactively monitor system health and minimize downtime.

 * Technical Mentorship:
Provide technical guidance and constructive code reviews to mid-level and junior engineers, encouraging best practices and continuous learning across the team.

 * Continuous Engineering Improvement:
Collaborate across adjacent QA, DevOps, and architecture teams to accelerate CI/CD pipelines, enhance stack-wide type safety, and deprecate legacy systems without disrupting product delivery.


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