Rohit G.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

AS400 & IBM i Developer (10+ yrs, 100% JSS) expert in RPGLE, SQLRPGLE, COBOL/400, Synon, Visual LANSA, Adelia, PHP on IBM i & Db2 modernization. If your IBM iSeries (AS/400) or Mainframe system runs your business, you cannot afford instability, failed migrations, or operational disruption. I help enterprise organizations modernize, stabilize, and future-proof mission-critical RPG and COBOL applications—combining 10+ years of hands-on legacy engineering with AI-enabled transformation workflows for zero-downtime delivery. 1. CORE IBM i (AS400) & MAINFRAME LANGUAGES & TOOLS • RPG & CL Ecosystem: RPG, RPGLE (Free Format), SQLRPGLE, CL, and CLP development, enhancement, and production support. • COBOL Ecosystem: COBOL, COBOL/400 (COBOL400), NetCOBOL, Fujitsu COBOL, and Mainframe JCL / VSAM. • 4GL, CASE & Web on IBM i: SYNON (CA 2E), Visual LANSA, ADELIA, and PHP on IBM i for rapid application development and web enablement. • Database Engineering: IBM Db2/400 (Db2 for i) and Microsoft SQL Server (MS SQL)—specializing in database performance optimization, query tuning, indexing strategies, and workload stabilization. 2. LEGACY MODERNIZATION & API INTEGRATION • System & Database Modernization: DDS to DDL conversion, Green Screen to Web UI transformation, monolith system refactoring, and technical debt reduction. • API & B2B Connectivity: REST API development, API enablement of monolithic applications, and secure third-party integrations using JSON, XML, and Electronic Data Interchange (EDI). • Low-Risk Migrations: Legacy RPG & COBOL code migration, Mainframe to IBM i transitions, custom ERP enhancements, and hybrid architecture execution plans. 3. AI-ENABLED AUTOMATION & DEVOPS OPTIMIZATION • AI-Assisted Modernization: AI-assisted legacy code analysis, structured documentation, AI-driven log monitoring, and anomaly detection. • Batch & DevOps Automation: Batch job and workflow automation, deployment automation for IBM i environments, production issue root cause analysis, and automation scripts that reduce operational overhead. WHAT SETS ME APART: • I understand IBM i systems are business-critical assets—not experiments • I prioritize stability before innovation and use AI tools strategically to improve speed and code reliability • I take full ownership—from initial assessment to post-deployment support CORE SEARCH SPECIALIZATIONS: AS400 Developer & IBM i (iSeries) Modernization | RPGLE, SQLRPGLE, COBOL400, NetCOBOL & Fujitsu COBOL | Synon (CA 2E), Visual LANSA & Adelia | PHP on IBM i & AS400 Web Integration | Db2 for i (Db2/400) Optimization & DDS to DDL | Green Screen to Web Transformation | EDI Integration, JSON Handling & API Modernization | Mainframe Migration, Digital Transformation & Production Support Click "Invite to Job" at the top right to modernize your IBM i / AS400 system strategically, safely, and with long-term ROI.