About CardNexus

CardNexus is building the ultimate platform for the Trading Card Game (TCG) community. Designed for players, collectors, investors, and game stores, we simplify collection management, provide real-time market insights, and streamline trading through smart matching technology. Our all-in-one solution bridges the gaps between fragmented tools and outdated systems, enabling users to value, trade, and grow their collections efficiently.

Founded in 2024 by a team of repeat entrepreneurs and lifelong TCG enthusiasts, CardNexus brings together deep expertise in technology, product design, and competitive trading card games. We’re on a mission to redefine how millions of TCG fans engage with their collections—from streamlining inventory to optimizing trades and building a thriving community.

If you’re passionate about TCGs and want to shape the future of the industry, we’d love to have you on board!

Role Overview

As a Senior Backend Engineer at CardNexus, you'll play a pivotal role in designing and implementing the architecture for our all-in-one TCG platform. As an early employee, you'll have the autonomy to shape our systems and infrastructure, ensuring scalability, performance, and reliability for a high-traffic marketplace. We're fostering a culture of gamers, so if you love TCGs or are a fan of gaming, you'll feel right at home.

As a remote-first company, CardNexus offers you the chance to collaborate with a diverse, global team across multiple time zones and cultures. You'll report to a supportive and experienced team while making a direct, visible impact on our growing TCG community. Whether you're located in Europe or the US, this role provides the flexibility to drive meaningful change from wherever you call home.

What You’ll Do

As a Senior Backend Engineer, you will take full ownership of backend architecture, from problem definition to implementation and optimization. You will be responsible for delivering high-performance, scalable solutions for a high-traffic marketplace, ensuring every feature is built with efficiency, resilience, and maintainability in mind. Over the next 24 months, you will:

Deliver Complex Features: Lead the implementation of intricate features such as:
- Real-time card scanning, inventory management, and trade matching.
- A scalable inventory system capable of handling large user collections efficiently.
- Integration of a Payment Service Provider (PSP) and user wallet system, ensuring secure transactions and seamless payment processing.
- Performance and cost optimization at all levels, ensuring minimal resource usage while maintaining high speed.
- Infrastructure scaling strategies to handle millions of daily requests reliably.
Optimize for Performance and Cost Efficiency: Ensure that every piece of infrastructure and code is optimized for speed, resource efficiency, and minimal operational cost.
Scale Infrastructure for High Traffic: Build robust logging, monitoring, and scaling strategies to handle millions of daily requests seamlessly.
Ensure Security and Compliance: Implement rigorous security measures, including KYC processes, to protect users and maintain trust.
Streamline CI/CD and DevOps: Enhance deployment pipelines for seamless integration and rapid iteration.
Solve Broad and Deep Technical Challenges: Leverage your expertise across databases, cloud infrastructure, and backend technologies to deliver cutting-edge solutions.

What You Bring

Proven Track Record of Ownership: You take full accountability for projects, seeing them through from conception to delivery, ensuring high-quality results.