About the role
We are looking for a Staff Backend Engineer with 8+ years of experience to help scale the backbone of Arena Club's platform as we rapidly expand into new collectibles categories. You'll be a highly opinionated architect who can own large projects end-to-end — from designing container-based systems to shipping new category launches in months. We need someone who thrives in a fast-paced, consumer-facing marketplace environment handling billions of transactions monthly, and who is comfortable using AI-powered development tools daily. This is a role for an engineer who can balance greenfield builds with legacy migrations while collaborating cross-functionally in a low-ego, high-ownership culture.
What will you be doing?
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Designing and scaling container-based backend architecture (EKS) to handle rapidly growing transaction volume (from 1.5B to 2.5B+ monthly)
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Building backend systems for new category launches (e.g., watches, upcoming verticals) with unique inventory and scaling requirements
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Migrating monolith repositories to microservices while keeping existing systems running
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Owning production reliability through observability (Datadog, Sentry), scalability planning, and working closely with the DevOps team
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Using Arena Club's internal AI harness and tools like Claude Code and Cursor as a first step in your PR workflow
