• Maintain and evolve the large codebase that powers our billing and payments service • Integrate with external billing-related services and connect new payment gateways • Solve production payment issues and keep the system reliable and secure • Design and review software architecture for new payments features • Implement hypotheses and run experiments to move core business metrics • Write tests and contribute to a well-covered, high-quality codebase • Analyze relevant metrics to inform decisions and validate experiment outcomes

• Develop backend services for real-time fraud detection, transaction monitoring, and risk analysis. • Build and maintain scalable microservices to support risk assessment models and rule-based detection systems. • Integrate machine learning models and risk scoring engines into backend systems. • Participate in AI-assisted development initiatives, including automated code generation, intelligent alerting, and integration of LLM-powered risk operations tools.

Java Software Developer Location: USA- Requisition # R67543 Locations USA-Remote Work Posting Date 05/01/2026 Security Clearance Required Public Trust/Suitability Remote Type Fully Remote Time Type Full time Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH! MANTECH seeks a motivated, career and customer-oriented Java Software Developer (Lead) to join our team. This is a remote position. Responsibilities include but are not limited to: - Design, develop, and deploy scalable Java-based applications and RESTful services. Lead the decomposition and refactoring of legacy monolithic systems into modern architectures. - Coordinate the implementation of DISA STIG requirements, oversee secure code scanning, and lead vulnerability remediation efforts. - Design and manage database schemas and write complex queries using Oracle SQL. - Lead implementation planning for complex enhancements and drive defect reduction through systematic analysis and code reviews. - Produce and interpret core technical documentation, including SDD, SSDD, and DBDD. - Provide technical guidance to junior engineers, fostering engineering best practices and a culture of continuous improvement. - Actively participate in all Agile (Scrum/Kanban) ceremonies and coordinate with stakeholders to assess technical impacts, risks, and delivery options. - Support release strategy, deployment readiness, and operational transition planning. Minimum Qualifications: - A minimum of 8 years of professional experience in Java software development. - Bachelor’s Degree in Computer Science, Engineering, or a related technical field. - Must hold an active CompTIA Security+ certification. No other certifications are required. - Demonstrated experience working in an Agile development environment. - Technical Skills: - Strong proficiency in Java development and experience building RESTful APIs. - Proven capability to decompose and refactor existing Java functionality. - Required experience in database management and the Oracle SQL language. - Ability to produce and understand SDD, SSDD, and DBDD documentation. Preferred Qualifications: - Familiarity with the Linux operating system and its basic tools. - Basic understanding of frameworks like Spring or Hibernate. - Experience with front-end frameworks, particularly PrimeFaces. - Knowledge of IBM specific network interfaces. - Basic understanding of containerization technologies (Docker, Kubernetes) and cloud platforms (AWS, Azure). Clearance Requirement - Must be a U.S. Citizen and able to successfully obtain and maintain a Public Trust / T-1 level background investigation. Physical Requirements: - Must be able to remain in a stationary position 50% - Frequently communicates with co-workers, management, and customers, which may involve delivering presentations The projected compensation range for this position is $105,900.00-$177,300.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections. MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.

Role Description We are looking for a Mid-Level AI / Backend / API Developer to join our growing team. This role combines backend engineering with AI integration, focusing on building scalable systems and APIs while incorporating intelligent features into applications. The ideal candidate has strong backend development experience and is comfortable working with AI tools, APIs, and data-driven systems. - Design, develop, and maintain scalable backend systems and services - Build and manage RESTful and/or GraphQL APIs - Integrate AI/ML models and third-party AI services into applications - Handle database design, optimization, and data processing - Collaborate with frontend developers, product managers, and other stakeholders - Ensure performance, security, and scalability of backend systems - Write clean, maintainable, and well-documented code - Troubleshoot and debug issues across the system Qualifications - 2–5 years of experience in backend development - Strong proficiency in at least one backend language (e.g., Node.js, Python, Java) - Experience building and consuming APIs (REST/GraphQL) - Solid understanding of databases (SQL and/or NoSQL) - Experience integrating third-party services and APIs - Familiarity with cloud platforms (AWS, Azure, or GCP) - Understanding of software development best practices and design patterns Requirements - Experience working with AI/ML APIs or frameworks (e.g., OpenAI, TensorFlow, PyTorch) - Understanding of basic machine learning concepts - Experience handling data preprocessing and model integration is a plus