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Hello, I consider myself an expert in Oracle Database world and Open for new opportunities! I'm passionate about solution in Oracle Database design + APEX+ OCI + ORDS + OAC Expert Developer. Working with more than 13+ years' experience in Oracle technology stack. With proven experience of expert in database and OCI practice. ⭐| Technical Area Expertise: -------------------------------------------- ✔️Expert Oracle SQL/PLSQL Developer ✔️Expert Oracle APEX Developer ✔️Oracle Cloud Infrastructure (OCI) ✔️Oracle ORDS services REST develop ✔️Oracle VBCS and Form & Report ✔️Oracle OAC OBIEE Publisher Reports ✔️Oracle WebLogic support and Maintains ✔️AI&ML services projects ✔Data Integration ETL tools ⭐| Database- Technical Expertise: • Strong knowledge of Oracle Database versions 23ai/19c/12c/11g • Hands on Data Modelling and Database Design • Expert knowledge of Performance Optimizations Query Tuning • Expert of advance SQL quires & PL/SQL Programming • Hands on collections and records advance level exception handling • Database DBA Administration for standalone and OCI hosted database • Database connection issue with other languages TNS troubleshooting • Debugging of issue and SQL developer data import and export • Oracle WALLET manager , ACL and Network security issues • Oracle Certificate installations for API outbound call from DB • Send SMTP and HTTP send mail from database • Oracle REST Data Services (Configurations, REST APIs development) • Webservices Types REST, SOAP XML & JSON Data Processing • Data integrations and ETL tools (data extractions transform) ⭐| APEX - Technical Expertise: • Oracle Apex 24.1, 23, 22.x,20.x,19.x,18.x,5.x • SQL& PL/SQL Programming expert (Advanced Level) • Expert in writing Oracle Function, Procedure, Package ,Triggers, cursors and sequences. • Oracle Forms and reports to APEX modernization • Implemented projects on Oracle cloud AI Services (Generative AI, Language, Vision, Document, speech) with APEX projects • Oracle REST Data Services (ORDS) APIs development and ORDS Configurations • Integrations with APEX- Oracle Services, Microsoft, Google, Amazon, Digital Ocean, Login.com, Tableau, PayPal. • Webservices Types REST, SOAP XML & JSON Data Processing in APEX. • Automations With APEX services like Files processing, mails notification, Reports and Custom JOBS. ⭐| OCI - Technical Expertise • Setting up and managing OCI networking (VCN, subnets, gateways, VPNs, etc.) • Configuring OCI Web Application Firewall (WAF) to protect applications • Email Delivery setup with (DKIM setting) • Data-integrations, data-loading, OAC report setups • WebLogic, NGINX, and load balancer setups OCI • Supporting migration of workloads (VMs, databases) to OCI • Configure DNS and manage domain mapping to the new OCI resources. • Managing Identity and Access Management (IAM): domains, policies, dynamic groups, compartments • Setting up IAM policies, compartments, and security controls (Cloud Guard, Vault) • Working with Linux-based environments (Oracle Linux, RHEL) for system configuration, performance tuning, and troubleshooting • Monitoring, performance tuning, and cost optimization • Installation of Oracle database, APEX, OBI, ORDS, WebLogic infra. ⭐| OAC/OBIEE - Technical Expertise • OAC report dashboard design • Working on BIP report development • BIP report bursting and exporting • Email delivery of monthly reports using Bursting • Crystal AOP, Jasper, PLPDF, Tableau Reports. I have been working with clients across the globe. 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞 I guarantee to solve your technical problems 100% in timely manner! Thanks for reading my profile and I am confident that we can make your project successfully together.

If your IBM i (AS400) or Mainframe system runs mission‑critical operations, you need modernization without risk I help organizations stabilize, modernize, and integrate legacy IBM i / Mainframe applications while preserving uptime, performance, and business logic. My approach focuses on incremental, low‑risk modernization—extending system life while enabling web, API, cloud, and AI‑driven innovation. With deep hands‑on experience across RPG, COBOL, Mainframe technologies, EDI integrations, and modern web stacks, I provide senior‑level ownership from assessment through production support. What I Bring IBM i / AS400: IBM i (AS400), iSeries, IBM Power Systems (V5R3–V7R5) — system modernization, application migration, performance optimization, and production stability. RPG & ILE: RPG Free, RPGLE, SQLRPGLE, RPG II–IV, CLLE, ILE — legacy refactoring, modularization, DB2 optimization, DDS‑to‑SQL migration. COBOL & Mainframe: COBOL, NetCOBOL, Fujitsu COBOL, CICS, JCL, DB2, VSAM — mainframe modernization, batch migration, performance tuning, controlled legacy transformation. Integration & Modernization: AS400 green‑screen to web (Profound UI, LANSA, SYNON, Rocket Aldon), APIs, EDI (ANSI X12, EDIFACT), ERP & Manhattan WMS integration, ESB, JSON, hybrid/cloud modernization, Angular & React frontends. AI‑Assisted Modernization: AI‑based code analysis, documentation, refactoring, anomaly detection, and batch/workflow automatio Services AS400 & Mainframe Modernization | RPG & COBOL Migration Green Screen to Web Conversion | EDI & API Integration DB2 & Data Migration | Production Support & Maintenance Skills & Technologies Languages: RPG, RPGLE, RPG Free, COBOL, NetCOBOL, JCL, SQL, Python, Java, PHP Databases: DB2/400, IBM Db2, VSAM, PostgreSQL, MS SQL Tools: Profound UI, LANSA, SYNON, Presto, Rocket Aldon, RDz, Eclipse Source Control: Aldon, Turnover, Implementer, Endevor, Git, SVN Platforms: OS/400, IBM i, AS400, IBM Power Systems Infor & JDE Integration: Experience integrating IBM i / AS400 systems with Infor (LN, M3) and JD Edwards (JDE)—supporting data migration, interface development, batch jobs, APIs, and EDI‑driven business workflows. Domains- Banking | Retail | Manufacturing | Insurance | Healthcare | Life Sciences | E‑Commerce | Defense If your IBM i / AS400 or Mainframe environment is critical to revenue, let’s modernize it strategically, with stability and measurable ROI. Click “Hire Me” or send an invite to discuss your project. Keywords IBM i Modernization | AS400 Modernization | RPG Modernization | RPG Free | RPGLE | COBOL Modernization | NetCOBOL | Fujitsu COBOL | Mainframe Modernization | Green Screen Modernization | IBM i Web Enablement | RPG to Java | RPG to .NET | DB2 Migration | ERP Integration | Manhattan WMS | EDI Integration | AI Legacy Modernization | IBM Power Systems | API Integration | Legacy System Transformation

Hello, Myself, Debasis from Kolkata, have 9 years of experience in Oracle APEX (ver 4.2 - 24.2) mainly, have experience in SQL, PL/SQL, Frontend part (JavaScript, jQuery, CSS, HTML). I have worked on a few 3rd party API Integrations with Oracle APEX applications and worked on AOP, BI Publisher also. I have some knowledge in Oracle Fusion Cloud API Integration in Oracle APEX. Thanks, Debasis Kundu

As an Oracle APEX developer with several years of experience, I specialize SQL, PL/SQL, and optimization. My skills extend to working with Oracle and MySQL databases and integrating APIs with Oracle APEX. In addition, I am familiar with other programming languages like Java, C/C++, PHP, JavaScript, HTML, CSS, jQuery, and AJAX. I have experience working with Amazon AWS, including EC2 Cloud, RDS, S3, Cognito, Route53, and Lambda. I am also knowledgeable in database design and monitoring, and routinely perform maintenance tasks to ensure optimal performance. I have also integrated various APIs with Oracle and Oracle Apex, such as Twilio, Zoom, GoToMeeting, Instamed, and Heartland. I have created custom plugins for oracle apex to implement new features and monitored databases from day-to-day. I have collaborated with teams of developers and temporary resources to deliver quality software products that meet client requirements and deadlines. Additionally, I worked on Oracle Forms to Oracle APEX conversion project, where I worked on creating Oracle Apex aplication and replicating the pages and forms and triggers and actions by analyzing the xml exports from Oracle Forms applications and manually replicating them (or creating Identical/as similar as possible - pages, reports, forms and grids) in Oracle APEX Currently, I am working on an international admissions solution for institutions in the US to manage the admission of international students, as well as an electronic health records project that provides a comprehensive solution for various healthcare requirements. Through these experiences, I have developed strong communication and teamwork skills that allow me to work effectively with individuals from diverse backgrounds and skill sets.

An IT Professional with 18+ years of experience in the areas of Software Development, Project management, Business Analysis, Solution Design and Implementation with reputed organisations. An effective leader with proven abilities in leading teams during the project phase, training and guiding team members and enabling knowledge sharing among the team. I have mentored peers, juniors and occasionally given talks at prominent conferences. Hands-on experience in designing & implementing multi-tier applications and system integration solutions as a senior developer and technical lead. Adept in unit testing, code coverage, code reviews, refactoring, automation, self learning and agile development. Comfortable in interacting with people across hierarchical levels for smooth project execution. Experience of working on web development, database development, application development, testing, builds/install management, automation, code reviews, requirements gathering, estimates, design documents, UX design, etc. •Have experience in developing/maintenance of application with components designed in managed and unmanaged code using Microsoft windows technologies using C++/C#/F#/Python • C++, C# .NET and Python/JavaScript languages. • WCF, ASP.NET Web API, Node.js. • UI framework like Windows Forms, WPF, AngularJS • Microsoft SQL server and MongoDB. • Multi-threading, SOAP/ RESTful Web services, Socket Programming. • Object oriented and Functional programming style. • Algorithms and data structures. • Domain Specific Languages • MONO C# in Linux.

I modernize legacy systems across IBM Z, Micro Focus, Fujitsu NetCOBOL, and OpenVMS, helping organizations move from complex COBOL workloads to modern, cloud-ready, API-enabled architectures. With 12+ years of deep technical experience in COBOL, PL/I, Assembler, JCL, DB2, Rdb, SQL Server, and Oracle, I specialize in solving real modernization challenges—whether it’s re-engineering legacy code, designing migration architectures, or enabling DevOps tooling for mainframe and distributed systems. Core Expertise Mainframe & Legacy Development COBOL, PL/I, Assembler (HLASM), JCL, DB2, CICS, VSAM Legacy Migration & Modernization IBM Z, AS400, Micro Focus, Fujitsu NetCOBOL, OpenVMS (COBOL/Forms/Fortran) Platform Modernization COBOL refactoring → SQL Monolithic → Modular/API-enabled systems Batch → Event/API workflows Micro Focus & Fujitsu Modernization Enterprise Server / Enterprise Developer NetCOBOL migration COBOL-to-Java / COBOL-to-API strategies Cloud & DevOps Modernization AWS, Azure, GCP Docker, Kubernetes, Terraform, Ansible, Jenkins Zowe, VS Code, Git/GitHub for IBM Z Database & Data Migration DB2 → SQL Server AS400 → SQL Server Oracle → Modern RDBMS Rdb (OpenVMS) → Cloud databases What I Deliver: End-to-end modernization assessments (architecture + sizing + roadmap) Migration from IBM Z/AS400/OpenVMS to Micro Focus or cloud platforms COBOL code analysis, optimization, and reverse engineering Modernization of Fujitsu NetCOBOL and Micro Focus applications API enablement for legacy applications CI/CD for mainframe and hybrid environments Clean documentation, clear communication, and reliable execution If you need an expert who can analyze, modernize, migrate, or re-architect legacy systems with minimal risk—I can support you from assessment through delivery.