Full Stack Developer (Payments)

Solü is seeking a Full Stack Developer (Payments) to design, develop, and implement a secure eCheck payment solution integrated with an existing Online Payment System (OPS). This role will focus on delivering a seamless customer experience by enabling users to initiate ACH/eCheck payments through a web-based interface accessible from public-facing PUC websites, while ensuring reliable, compliant, and scalable transaction processing. The ideal candidate will bring extensive experience in payment systems, web application development, API and system integrations, and enterprise application architecture. This individual will play a key role in designing and delivering a secure, customer-facing payment platform that integrates with existing enterprise and legacy systems in a highly regulated environment. Responsibilities Design and develop a web-based eCheck ACH payment module that integrates with the existing OPS platform. Build and maintain a secure customer-facing payment interface accessible via the PUC websites. Develop backend services and APIs to support payment workflows validation and transaction processing. Ensure compliance with financial regulations security standards and data protection requirements e.g. PCI-DSS NACHA guidelines. Collaborate with internal stakeholders to gather business and technical requirements and translate them into effective system architecture and user experience designs. Designintegrate test and deploy the eCheck solution with existing enterprise/legacy systems and payment workflows. Conduct usability reviews and recommend interface improvements based on user feedback analyticsand best practices. Ensure compliance with accessibility standards and modern web usability guidelines for public-facing applications. Troubleshoot and resolve issues related to payment processing system interfaces and performance. Document system architecture workflows and technical specifications. Provide recommendations for scalability reliability and future enhancements. Support ongoing maintenance upgrades optimization and production support. Participate in code migration from TFS to Azure DevOps ADO with Git version control. Utilize Azure DevOps ADO for work item tracking CI/CD pipelines and code management. Qualifications Bachelor’s degree in computer science, Information Technology, or related field (or equivalent experience) 5+ years of experience in software development and system integration, including integration with enterprise and legacy platforms Proven experience developing and integrating payment processing systems (ACH/eCheck preferred), including secure transaction processing, encryption Strong proficiency in modern web application development, including JavaScript, HTML/CSS, front-end frameworks, and technologies such as Java, .NET Demonstrated experience designing and developing customer-facing web applications with strong UI/UX focus, including responsive design, accessibility Experience implementing APIs and system integrations using REST and/or SOAP services Experience with relational databases and data modeling Experience with Azure DevOps (ADO) for work item management, repositories, and CI/CD pipelines Experience migrating code from TFS to Git-based repositories Background in government, utilities, or other highly regulated environments Experience integrating with enterprise and legacy systems Experience with Microsoft Azure services, including App Services, Functions, and API Management Experience designing customer-facing payment, checkout, banking, or other transaction-based digital experiences, including application of UI/UX best Experience with high-availability, transaction-based systems, including online billing, invoice payment platforms, ACH processing workflows, and ban Show more Show less