Senior Backend Developer

About the position Command Cyber Solutions is seeking a highly experienced Back-End Developer, Senior to support the IRS Business Tax Account (BTA) modernization initiative as part of the Taxpayer Experience (TXE) Strategy. This role will focus on building secure, scalable, and high-performing server-side applications and APIs that support taxpayer-facing digital services. The developer will work closely with cross-functional teams, including front-end engineers, DevOps, cybersecurity, and IRS stakeholders, to design, develop, and maintain back-end solutions aligned with IRS cloud and security standards. Responsibilities • Lead the design and development of secure back-end services, RESTful APIs, and microservices that integrate with IRS digital platforms. • Implement best practices for cloud-native applications in an AWS and Kubernetes-based environment, ensuring compliance with IRS Publication 4812, NIST 800-53, and FISMA requirements. • Troubleshoot and resolve production issues, providing root cause analysis and implementing long-term fixes. • Contribute to performance tuning, scalability testing, and capacity planning to meet IRS standards for availability and load performance. • Collaborate with product owners, technical leads, and stakeholders to refine user stories and translate them into functional back-end features. • Support CI/CD processes using Jenkins, GitHub Actions, and SonarQube, including automated testing and secure deployments. • Perform unit testing, integration testing, and assist in developing automated test cases to ensure 90%+ code coverage for critical functionality. Requirements • Bachelor's degree in Computer Science, Software Engineering, or related field. • Ability to obtain and maintain a Public Trust background investigation in accordance with IRS and Department of the Treasury personnel security policies. • CompTIA Sec+ (or equivalent baseline DoD 8570 IAT Level II certification) (Required). • AWS Certified Developer – Associate (or equivalent cloud certification) (Required). • 7+ years of back-end development experience, including at least 3+ years in a senior or lead developer role. • Experience working in Agile/Scrum environments delivering iterative releases. • Familiarity with IRS cloud environments, FedRAMP, FISMA, and NIST 800-53 standards. • Experience with tools such as Jenkins, Git, SonarQube, NexusIQ, Selenium, and AppDynamics. Nice-to-haves • Certified Scrum Developer (CSD) or other Agile-related certification (Preferred). • AWS Certified Solutions Architect – Associate or Professional (Preferred). • Certified Kubernetes Application Developer (CKAD) or similar container-related certification (Preferred). • Certified Secure Software Lifecycle Professional (CSSLP) or similar secure software development credential (Preferred). Benefits • Medical and prescription drug plans. • Dental coverage. • Group life insurance and options for supplemental life insurance. • Short-term and long-term disability insurance. • Flexible spending accounts. • Employee assistance programs. • Identity theft protection. • Competitive 401(k) retirement savings plan with company contributions.