Senior Back End Developer - Distributed Systems (C# or Golang) (Chicago)

Our client, a fast-growing organization developing secure, scalable technologies for next-generation AI applications, is seeking a Backend Engineer to join their core platform team.

In this role, youll help build and refine the foundational services that power authentication, observability, data flows, and high-availability systems across a distributed ecosystem. This is an opportunity to work on complex backend challenges while shaping the infrastructure that supports mission-critical applications.

What Youll Do

• Develop, enhance, and support backend services that form the foundation of the platform.
• Build and maintain core authentication and authorization capabilities.
• Apply principles of Domain-Driven Design to guide how services and components evolve over time.
• Architect, extend, and support event-sourced systems to ensure durable, consistent operations at scale.
• Participate in API design and integration efforts across internal and external stakeholders.
• Implement and support messaging frameworks (e.g., NATS) to enable reliable service-to-service communication.
• Maintain and improve observability toolingincluding metrics, tracing, and loggingto ensure healthy system performance.
• Work closely with infrastructure, DevOps, and engineering teams to ensure robust, secure, and maintainable operations.

What You Bring

Why This Role Is Compelling

Youll contribute directly to a foundational platform used across an entire organizationimpacting performance, reliability, and security at every layer. If you enjoy solving distributed-system challenges and working on complex, high-scale backend services, this is a strong match.

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