Senior Backend Engineer

Arena ClubLos Angeles, CA, US

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Job Description

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

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Senior Backend Engineer • Los Angeles, CA, US