• Design, build, and enhance features across multiple Gateway Portal applications used by NMI staff, partners, and merchants • Develop and maintain front-end and back-end functionality using technologies such as PHP, C#, JavaScript, React, and Angular • Develop and maintain MySQL queries aligned with best practices for performance and scalability • Write unit, integration, and end-to-end tests to ensure code quality and reliability • Document business logic, application workflows, and technical design decisions • Collaborate with Product Managers to refine requirements and contribute to technical solution design • Participate in code reviews to maintain high engineering standards and share best practices • Work with Site Reliability Engineering and QA teams to ensure software is observable, resilient, secure, and production-ready • Diagnose and resolve incidents, defects, and performance bottlenecks in collaboration with cross- functional teams • Contribute to continuous improvement of development processes, tooling, and engineering practices