Role Description As a Fullstack Developer on our team, you will own end-to-end delivery of the BetSymphony Backoffice and frontend applications — a mission-critical internal tool used by operators to manage players, trading, promotions, casino, payments, and reporting in a regulated environment where correctness, performance, and reliability are non-negotiable. We are a team that embraces AI-assisted development as a standard part of the engineering workflow. We expect our engineers to actively use AI tools to accelerate delivery, improve code quality, and reduce time spent on repetitive work — not as an experiment, but as an everyday practice. Qualifications - 5+ years of total software development experience - 3+ years of production experience with React, including complex state management (Redux / Redux Toolkit) - 2+ years of Node.js experience, with hands-on use of Express.js in a production BFF or API layer - Strong proficiency in TypeScript across both frontend and backend - Experience with unit and integration testing (Vitest, Jest, or similar) - Experience working in a microservices architecture, including understanding of BFF layer integration - Familiarity with Docker and basic Kubernetes workflows - Proven experience using AI-assisted development tools (e.g., Claude, Cursor, GitHub Copilot, ChatGPT) in daily work (code generation, refactoring, debugging, testing, documentation) — this is a standard expectation, not optional - Strong English communication skills (B2+) - Self-organized, proactive, and comfortable working in a distributed team Requirements - Experience with JIRA, and Confluence - Experience with ElasticSearch - Experience in gambling or online gaming - Experience with TDD development processes - Strong interest in applying AI-powered tools (e.g. Claude, ChatGPT, Copilot, Cursor or similar) to speed up day-to-day development tasks - Proven ability or strong motivation to use AI to reduce development time, improve code quality, and automate repetitive engineering work Job Responsibilities - New features development within the existing product - Resolving technical problems as they arise - Bug fixing of developed features - Actively leverage AI-assisted tools to improve efficiency across coding, testing, debugging, and other SDLC activities - Writing Unit tests and integration tests - Communicating with team members and the Product team - Scrum ceremonies participation - Mentoring middle and junior colleagues might be required

• 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.