Position Overview: We are seeking a seasoned Mainframe System Analyst with deep expertise in Natural 4 / ADABAS, to serve as a critical resource in an ongoing enterprise application modernization initiative for a city government agency. This role is a backfill for a key analyst position and will involve extensive work on integrating the legacy Buildings Information System (BIS) with new cloud-based and web-enabled platforms. The ideal candidate brings not only strong mainframe technical skills but also excels in systems analysis, requirements interpretation, interface design, and cross-functional coordination. Job Title: Mainframe Natural / ADABAS System Analyst Location: Remote Duration: 12 Months Key Responsibilities: • Serve as the lead analyst for integration between BIS (Natural/ADABAS-based) and modern application ecosystems. • Perform in-depth analysis of existing BIS architecture, data flows, and business processes. • Define, document, and translate business and technical requirements into detailed functional and interface specifications. • Collaborate with internal city resources, development teams, and external vendors to ensure proper integration design and implementation. • Support development teams in understanding legacy logic and assist in reengineering legacy processes where needed. • Participate in planning, system design reviews, integration testing, and go-live support. • Analyze and troubleshoot data conversion issues, normalization logic, and integration challenges. Required Skills & Experience: • 12+ years of experience in systems analysis or application support roles within large-scale mainframe environments. • 8+ years of hands-on experience with Natural 4 / ADABAS in both batch and online transaction environments. • Proven expertise in JCL scripting and working within TSO environments. • Strong understanding of complex batch processing and scheduling logic. • Experience with ENTIREX Broker or similar middleware integration frameworks. • Solid grasp of data structures, data conversion, and normalization techniques. • Exceptional analytical and documentation skills—able to bridge business needs with technical design. Desirable Skills: • Knowledge of Buildings Information System (BIS) or DOB NOW platforms. • Familiarity with Java-based web portals such as BISWeb. • Experience with Software AG WebMethods or similar enterprise middleware. • Exposure to Business Intelligence/Reporting tools for data analysis. • Prior experience working with government agencies or other public sector clients on legacy modernization projects. • Ability to work in fast-paced environments with multiple stakeholders and external vendors. • Strong verbal and written communication skills, with ability to produce clear technical documentation. Additional Notes: • This is a high-visibility role supporting a mission-critical transformation. • The selected analyst will act as a bridge between business and technology, with responsibility for understanding the legacy BIS landscape and ensuring smooth, reliable integration into future-state systems.