CTG is seeking to fill a CSS Billing & Finance Sr. Application Developer opening for our client in Waltham, MA. Location: Remote Duration: 10 months W2 only, No C2C Duties: Lead and support mainframe modernization initiatives with a focus on migrating and optimizing legacy systems. Analyze, design, develop, test, and implement mainframe applications using COBOL, JCL, and related technologies. Work closely with business stakeholders and SMEs to translate legacy functionality into modern architecture while preserving business logic. Provide technical expertise in the Customer/1 and Customer/2 systems with emphasis on Billing and Finance domains. Collaborate with cross-functional teams including QA, business analysts, and infrastructure teams to ensure successful project delivery. Develop technical documentation and contribute to knowledge transfer activities. Skills: Proficient in COBOL and JCL on mainframe platforms. Strong understanding and hands-on experience with CSS Customer/1 and Customer/2. SME-level knowledge of billing systems and finance domain functionality. Familiarity with legacy system architecture and modernization strategies. Ability to work independently and as part of a distributed team. Experience: 5+ years of experience in mainframe application development. Significant experience working with utility billing systems (Customer/1 or Customer/2 preferred). Demonstrated success in modernization or migration projects within large enterprises. Education: Bachelor’s degree in Computer Science, Information Systems, or a related field preferred. Excellent verbal and written English communication skills and the ability to interact professionally with a diverse group are required. CTG does not accept unsolicited resumes from headhunters, recruitment agencies, or fee-based recruitment services for this role. To Apply: To be considered, please apply directly to this requisition using the link provided. For additional information, please contact Krista Eckard at Krista.Eckard@ctg.com. Kindly forward this to any other interested parties. Thank you! The expected base salary for this position ranges from $50/hr to $67/hr. Salary offers are based on a wide range of factors including relevant skills, training, experience, education, market factors, and where applicable, licensure or certifications obtained. In addition to salary, a competitive benefit package is also offered. About CTG CTG, a Cegeka company, is at the forefront of digital transformation, providing IT and business solutions that accelerate project momentum and deliver desired value. Over nearly 60 years, we have earned a reputation as a faster and more reliable, results-driven partner. Our vision is to be an indispensable partner to our clients and the preferred career destination for digital and technology experts. CTG leverages the expertise of over 9,000 team members in 19 countries to provide innovative solutions. Together, we operate across the Americas, Europe, and India, working in close cooperation with over 3,000 clients in many of today's highest-growth industries. For more information, visit www.ctg.com. Our culture is a direct result of the people who work at CTG, the values we hold, and the actions we take. In other words, our people define our culture. It's a living, breathing thing that is renewed every day through the ways we engage with each other, our clients, and our communities. Part of our mission is to cultivate a workplace that attracts and develops the best people, reflected by our recognition as a Great Place to Work Certified™ company across many of our global operations. CTG will consider for employment all qualified applicants including those with criminal histories in a manner consistent with the requirements of all applicable local, state, and federal laws. CTG is an Equal Opportunity Employer. CTG will assure equal opportunity and consideration to all applicants and employees in recruitment, selection, placement, training, benefits, compensation, promotion, transfer, and release of individuals without regard to race, creed, religion, color, national origin, sex, sexual orientation, gender identity and gender expression, age, disability, marital or veteran status, citizenship status, or any other discriminatory factors as required by law. CTG is fully committed to promoting employment opportunities for members of protected classes.