Design, develop, and maintain core .NET/C# services, APIs, and back-end systems. Implement and integrate third-party APIs for authentication, authorization, and payroll functions. Partner with product, AI, and engineering teams to improve systems, workflows, and product reliability. Collaborate with a primarily onshore team of engineers to ensure scalable, maintainable, and performant solutions. Mentor other engineers and contribute to best practices for coding, testing, and deployment. Identify opportunities for process improvement and system enhancements in a fast-moving startup environment. Ensure code quality, documentation, and security compliance across all deliverables.