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Senior Software Engineer

Robert Half Technology

Atlanta, GA, United States Full-time February 10, 2026

Found Description

Description
Overview

Our client is seeking a Senior Backend Engineer with deep expertise in OAuth 2.0, Auth0, and backend development using .NET (C#) and PHP. This engineer will help design and implement identity, authorization, and reseller-channel features within a distributed, multi-tenant architecture.

This is a hands-on development role requiring strong systems-level thinking and experience building secure, scalable, service-oriented systems.


Key Responsibilities

+ Design and implement OAuth 2.0 authentication/authorization flows.

+ Integrate client’s platform with Auth0 (Okta), including identity provider configuration.

+ Develop backend services using .NET (C#) and PHP.

+ Support microservices and distributed systems architecture efforts.

+ Model complex reseller / channel-partner ecosystems and access patterns.

+ Contribute to platform-wide security, API design, and hierarchical access mo...

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