Senior Back End Software Engineer

Job Title: Senior Back End Software Engineer Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: Secret Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US Anticipated Posting End: 8/31/2026 The Opportunity: We are seeking a talented and motivated Back-End/Services Software Engineer to join our dynamic development team. This role is ideal for a mid-career developer who is passionate about building scalable, reliable, and high-performance mission services. You will be responsible for designing, developing, and implementing modern C# microservices that run within a modern orchestration that support the verification and validation activities of the system. If you are eager to learn, enthusiastic about problem-solving, and ready to make a significant impact on our core product architecture, we would love to hear from you! Responsibilities: Design/enhance a containerized simulator Command and Control terminal capable of receiving and responding to ground commands for verification and validation events Work within a cross functional team to refine verification requirements Write E2E test to verify simulator against functional requirements Perform installation events for the containerized simulator Participate in agile events like program increments and sprint demonstrations Collaborate effectively within a cross functional team, supporting simulator integration events Participate in customer working groups. Qualifications: Required: Active Secret U.S. Government Security Clearance Bachelor's degree in computer science or related field At least 5 years of professional software development experience and working proficiency in C# Experience with lightweight frameworks such as FastAPI, Flask, Quarkus, or Spring Boot Proficiency with software packaging tools (uv, pip, Maven, etc) Comprehensive testing experience, including unit tests (e.g., pytest, JUnit), system tests, and integration tests Proficiency with various data storage solutions (PostgreSQL, MongoDB, AWS or Azure cloud storage services) Experience with source control tools (e.g., Git, GitLab) Experience implementing and managing CI/CD pipelines using tools such as GitLab CI/CD or Jenkins Experience containerizing and deploying applications using Docker and Kubernetes Desired: Knowledge of application development supporting Command and Control ground systems In-depth knowledge of and practical experience with standard AWS managed services (S3, ECS, EC2, Lambda, Step Functions, DynamoDB, OpenSearch) Experience with ArgoCD or GitOps deployment workflows Experience with Government Clouds (e.g., GovCloud, C2S) Experience with DevSecOps and Agile Scrum software development methodology, including tools like Jira and Confluence IAT Level II or III certification (e.g., Security+, CISSP, or CASP) What You Can Expect: A culture of integrity. At CACI, we place character and innovation at the center of everything we do. As a valued team member, you'll be part of a high-performing group dedicated to our customer's missions and driven by a higher purpose - to ensure the safety of our nation. An environment of trust. CACI values the unique contributions that every employee brings to our company and our customers - every day. You'll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality. A focus on continuous growth. Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. Since this position can be worked in more than one location, the range shown is the national average for the position. The proposed salary range for this position is: $75,200-$158,100 CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.