What are the responsibilities and job description for the Sr Fullstack Javascript Developer position at BKX Holdings, LLC?
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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
Title: Senior Full-Stack JavaScript Developer (Node.js / NestJS / Next.js)
Job Location: Remote - US
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.
Key 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
Qualifications:
- 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 Have (Optional)
- 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
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