About Arena Club If you're fascinated by sports cards and memorabilia, your search ends here. Arena Club is pioneering the collectibles domain by introducing the first-ever digital card show. Spearheaded by 5x World Series Champion Derek Jeter and serial entrepreneur Brian Lee, Arena Club has developed a fully digital marketplace. This innovative platform is built on trust, transparency, and fun, featuring grading & authentication, vaulting, and digital pack openings for collectors to build and showcase their collections in a personalized online showroom from anywhere in the world. Role Overview Join our fast-growing startup as a Senior Backend Engineer and help build the backbone of our platform. We are a dynamic, high-growth company where your work will have a direct impact on product success and scalability. This position is in-office, fostering a fun and collaborative environment, with flexibility for a hybrid arrangement to accommodate personal needs as life comes up. Key Responsibilities • Design, build, and maintain scalable backend applications and APIs using Node.js, TypeScript, and Postgres • Leverage AI-powered coding tools (e.g., GitHub Copilot, Tabnine) to improve development speed, code quality, and system reliability • Architect and optimize systems for high scalability and performance as the business rapidly expands • Implement third-party integrations and external APIs to enhance the platform's capabilities • Develop and maintain internal tools that support fulfillment operations, internal workflows, and machine learning initiatives • Collaborate cross-functionally with product, data, and frontend teams to ship high-impact features quickly • Ensure backend systems are secure, well-documented, and thoroughly tested Qualifications • 5+ years of experience as a professional backend engineer • Strong proficiency in Node.js, TypeScript, and Postgres • Proven experience building and scaling eCommerce or online marketplace platforms • Passion for using the latest AI coding tools and AI-driven best practices to enhance development workflows • Deep understanding of cloud platforms (AWS or GCP) and containerization/infrastructure-as-code tools (Docker, Terraform) • Ability to move fast and iterate quickly in a startup environment while maintaining high code quality • Excellent problem-solving skills and the ability to communicate technical trade-offs effectively Tech Stack • Languages & Frameworks: TypeScript, Node.js, Python • Database: Postgres • Cloud & Infrastructure: AWS (S3, SQS, etc.) • AI Development Tools: AI-powered coding assistants (e.g., GitHub Copilot, Tabnine), LLM-based development enhancements