Sr Fullstack Javascript Developer

Collectivus•Nashville, TN

3d•Remote

About The Position

Collectivus Holdings guides many of the most prestigious brands in the Collecting, Trading Card Game, and Hobby industries. With a century's worth of collective experience in driving product and service innovation, high-end quality standards, and elevated customer experience, Collectivus brands are among the most recognized and loved throughout the world by the communities they serve. Website: https://www.collectivusholdings.com Locations: Aarhus – Dallas – Delhi – Lisbon – Nashville – Worldwide. We are seeking a Senior Full-Stack JavaScript Developer (Node.js / NestJS / Next.js) to take technical ownership of both backend and frontend architecture. This role focuses on building and maintaining scalable, secure, and high-performance web applications using Node.js, NestJS, and Next.js. You will work with a high degree of autonomy, collaborate closely with product, frontend, and infrastructure teams, and help set engineering standards while mentoring junior developers.

Requirements

5+ years of professional experience with Node.js
Strong hands-on experience with NestJS and TypeScript
Solid experience building frontend applications with Next.js
Strong understanding of HTTP, authentication, sessions, and web security best practices
Hands-on experience with PostgreSQL, including schema design and query optimization
Proven experience building and maintaining production-grade APIs
Comfortable working in Linux/Ubuntu environments
Strong knowledge of Git workflows, debugging, and testing
Ability to work independently and take end-to-end technical ownership
Strong problem-solving skills and attention to detail

Nice To Haves

Experience with containerization (Docker) and CI/CD pipelines
Familiarity with cloud platforms (AWS, GCP, or Azure)
Experience with background jobs, queues, or event-driven systems
Exposure to monitoring, logging, and observability tools
Prior experience mentoring or leading small engineering teams

Responsibilities

Design, develop, and maintain backend services using Node.js, NestJS, and TypeScript
Build, document, and optimize RESTful APIs and integrate third-party services
Develop and maintain frontend applications using Next.js
Design and optimize PostgreSQL schemas, queries, and migrations
Define and maintain API contracts between frontend and backend systems
Ensure platform security, performance, scalability, and reliability
Conduct code reviews, enforce best practices, and mentor junior developers
Participate in system architecture decisions and technical design discussions
Troubleshoot, debug, and resolve production issues
Manage deployments and support applications on Linux/Ubuntu server
Maintain technical documentation and source control using Git/bitbucket