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Oracle Certified Database Engineer | 15+ Years | Multi-DB, Odoo ,Legacy Oracle Specialist and data migration. "I build the intelligence inside your data systems." 15+ years delivering scalable solutions across Oracle (certified), PostgreSQL, MySQL, SQL Server, MS Access, and more. Trusted by long-term clients for reliable, high-quality work. Expertise: • PL/SQL, tuning, optimization, migrations (Oracle + multi-DB) • ETL/ELT pipelines, Python automation • Odoo customization, modules, APIs • Biometric sync (ZKTeco/BioTime → Odoo HR/Payroll) • Oracle Forms & Reports development/maintenance; PHPRunner rapid web apps; desktop DB (MS Access, LibreOffice Base) • Legacy Oracle: Install & configure Forms 6i on Windows 11 (unsupported workaround) Results: Zero-touch payroll for 500+ users; 70%+ faster queries. Available for long-term partnerships. Message me to discuss your project!

With over ten years of comprehensive experience as Database Developer, Data Architect, Data Modeler, ETL, And Data Warehouse, My expertise lies in building high performance database systems , designing logical and physical data models, and crafting scalable data structures that meet complex business requirements. I specialize in database development, data modeling, ETL processes, and data warehouse design. I have experience in Oracle, SQL Server , PostgreSQL, and MySQL I focus on delivering high performance, reliable, and scalable data systems that enable analytics and support business decision making. Strong expertise in SQL, performance tuning, and managing large scale system

I’m a highly experienced Java Full Stack Developer with 12+ years in building secure, scalable web and enterprise applications. My expertise spans Java (7–21), Spring Boot, Hibernate, Angular, React, Next.js, REST/GraphQL APIs, and cloud services (AWS EC2, Lambda, RDS, S3, EKS). I’ve delivered solutions across industries like HRMS, eCommerce, Travel, Real Estate, and SaaS, and handled complex integrations with ERPs (NetSuite, SAP), GDS (Amadeus, Sabre), and payment/email/SMS gateways. Whether you need backend architecture, frontend development, API integration, cloud deployment, or end-to-end solutions—I'm ready to deliver clean, reliable, and business-driven code. 📩 Let’s collaborate and bring your vision to life! Languages, Tools and Technologies i've worked since last 12 years. Languages: Java (8–17), JavaScript, TypeScript, HTML5, CSS3, SCSS, SQL, NoSQL, GraphQL, Bash, Shell scripting, XML, JSON, YAML, WSDL, XSD Web Development ------------------- 1. CSS Frameworks: Bootstap, Tailwind. 2. Frontend Frameowrks: Angular (1.x - 17), ReactJS, React, NextJs, RxJs, NgRX, Redux, ExtJs. 3. Frontend UI Component Frameworks: PrimeNG, KendoUI, Quasar. 4. Mobile Frameworks: React Native, Java(MVVM). 5. Desktop Application Frameworks Java Swing, JavaFX 6. Backend technology & Frameowrks: JAVAEE, Struts, Spring, Springboot, Spring Security, Spring MVC, Spring Cloud, NodeJs. 7. Backend Caching Stores: Redis, Memcached 8. Search Framework: Elasticsearch, Apache Solr 9. Queue and Messaging Frameworks ActiveMQ, Kafka, SNS-SQS 10. API Standards and Protocols: Swagger/OpenAPI, GraphQL (basic), WebSocket/STOMP, SOAP, REST, MQTT, COM. 11. ORM Frameworks: JPA, Hibernate, Mybatis. 12. CMS Frameworks: Strapi, Payload. 13. Backend Templating Engines: JSP, JSTL, Thymeleaf, Freemarker, Primefaces. 14. Reporting Tools: Japser Report, Itext, Flying Saucer. 15. Gateway Framework: Zuul, Openresty, AWS API Gateway. 16. Web Servers: Tomcat, NginX, Jboss, Wildfly, Apache Karaf, Apache Httpd, Express. 17. Databases: PostgreSQL, MySQL, MongoDB, Neo4j, Sqlite. 18. Databbase Migration Frameworks: Flyway, Liquibase 19. Build Tools: Git, Gitlab, Bitbucket, Maven, Gradle, Docker, Docker Compose. 20. CI/CD Tools: Jenkins, Gitlab CI, Bamboo. 21. Artifecttory Framework: Nexus, Jfrog Artifactory 22. Container Orcastration tools & Frameworks: AWS EKS & ECS, Kubernetes. 23. Infrastructure Monitoring Tools & Frameworks: Prometheus, Grafana, Loki, Tempo, ELK (Elasticsearch, logstash, kibana) 24. Infrastructure provisioning Frameworks: Terraform 25. Cloud Providers: AWS, GCP, AZURE, HETZNER 26. Testing Frameworks Junit, Selenium, EasyMock, Mockito, HtmlUnitDriver 27. Web Scraping Framework Selenium Headless, HTMLUnitDriver, PhantomJs, Jsoup, Jmeter. 28. Profiling Tools VisualVM, Jprofiler, Yourkit. 29. Security Types & Tools: Password, Basic, Token, OAuth 2.0, SAML(SSO), LDAP, 2FA, Okta One Login, KeyClock 30, Compliances Awareness: GDPR, SOC2, POPIA, PCI-DSS ---------------- 1. Project Tracking Tools: JIRA, Trello, Clickup, Asana, Aiwi Team. 2. IDEs IntelliJ, Eclipse, Netbeans, VisualStudio 3. Cloud Services: AWS EC2, Beanstalk, Lmbda, Cognito, Batch, SNS, SQS, API Gateway, Load Balancer, Code Pipeline, Cloud front, ECR, ECS, EKS, DynamoDB, RDS, CloudWatch, S3. 4. ERPs & Integrations Netsuite, Broadleaf Commerce, Xero, Quickbook, SAP, GDS Systems like (Amadeus, Sabre, Galileo), AeroCRS, Radixx, American Express Virtual Card, Nightsbridge Hotel Supplier, EzShuttle, First Car, AVIS, Europcar, RouteSavvy Route Optimization, Google Maps. 5. SMS & Email Providers Twilio, Clikatell, Sendgrid, ZeptoMail, AWS SES, Custom Sendmail, Dovekot

I'm very friendly, easy to talk to, and easy to work with. Whether you are technical or not, I talk in plain English with no jargon so that you know exactly what's going on and how things work. I don't just work FOR you, but WITH you. I can tackle any Ruby tasks that you need. I can write anything from small Ruby scripts to full-blown Web applications. My code is clean, readable, and regularly refactored. TESTING IS A HIGH PRIORITY IN MY WORK, NOT AN AFTERTHOUGHT. I WILL WORK FOR A LOWER RATE FOR GOOD CAUSES. Efficient and Easy for You For web applications, I use Heroku, a service that allows me to quickly give you a product in a working state so you can immediately interact with it. No work needed on your end. I just give you a web address, and you see results in seconds. Knowledgeable I regularly follow Ruby news and attend conferences, so you can be confident that I am keeping up with technology. Flexibility I can work any day of the week at any reasonable hour of the day. I've had clients across the globe and have had no problems making myself available at a time that is convenient for them. I respond to emails quickly and give plenty of warning if I will not be available. "Why should I hire you when I can hire multiple developers for the same price?" Developers that are cheaper are often less experienced and less skilled. They might spend hours on the wrong solution to a problem. That means they could spend more time trying to make it work and more time trying to fix it. But a good developer will make better decisions, produce higher quality code, and can get the job done better and faster. With a good developer, you may very well spend less time and money and get a better product. Why Testing Matters There is no such thing as bug-free code. If you were an online bank, how confident are you that every transaction is working like it is designed to? Can you afford to have a bug? With automated tests, you have code that verifies your application is working as expected. Most good programmers nowadays are thoroughly testing their code. It helps with development, and it helps when things go wrong like many things eventually do. Tests will also help you make sure that fixing a bug here won't cause another bug way over there. Not having automated tests makes development SEVERAL TIMES slower, costing more money and more headache. Frameworks, gems, tools, etc. that I use: Ruby on Rails Sinatra HAML/SASS JavaScript CoffeeScript jQuery Minitest RSpec Jasmine Capybara Nokogiri Faraday Sidekiq Pro Bundler RVM ch-ruby homebrew PostgreSQL ActiveRecord Heroku SOA

🏆 𝐎𝐫𝐚𝐜𝐥𝐞 𝐀𝐏𝐄𝐗 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫, OCI Expert, 📊𝐎𝐫𝐚𝐜𝐥𝐞 𝐅𝐨𝐫𝐦𝐬 & 𝐑𝐞𝐩𝐨𝐫𝐭𝐬,📊𝐎𝐫𝐚𝐜𝐥𝐞 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞𝐬 - Delivering Excellence Every Time ✅ Successful projects on Upwork ✅ Multiple projects delivered with client satisfaction 🔥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐢𝐧 𝐎𝐫𝐚𝐜𝐥𝐞 𝐀𝐏𝐄𝐗, 𝐒𝐐𝐋, 𝐏𝐋/𝐒𝐐𝐋, 𝐉𝐚𝐯𝐚𝐒𝐜𝐫𝐢𝐩𝐭, 𝐎𝐫𝐚𝐜𝐥𝐞 𝐂𝐥𝐨𝐮𝐝 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 (𝐎𝐂𝐈), 𝐚𝐧𝐝 𝐑𝐞𝐩𝐨𝐫𝐭𝐬 💡 API Integration Specialist - Seamless Functionality Guaranteed Hello, I'm 𝐌𝐮𝐡𝐚𝐦𝐦𝐚𝐝 𝐀𝐡𝐦𝐚𝐝 𝐑𝐚𝐧𝐣𝐡𝐚, a highly skilled 𝐎𝐫𝐚𝐜𝐥𝐞 𝐀𝐏𝐄𝐗 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 with a proven track record in application development, API integrations, hands-on experience in Oracle Cloud Infrastructure (OCI), and a specialization in Reports. My dedication to Oracle APEX, OCI, and Jasper Reports goes beyond just skills—it's a passion that has driven my career for 4 years. 𝐌𝐲 𝐒𝐭𝐫𝐞𝐧𝐠𝐭𝐡𝐬 𝐚𝐧𝐝 𝐒𝐤𝐢𝐥𝐥𝐬 𝐎𝐫𝐚𝐜𝐥𝐞 𝐀𝐏𝐄𝐗 𝐌𝐚𝐬𝐭𝐞𝐫𝐲: Expertise in designing and deploying robust web applications rapidly. 𝗢𝗿𝗮𝗰𝗹𝗲 𝗖𝗹𝗼𝘂𝗱 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲: Skilled in creating scalable and reliable cloud-native applications. 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐏𝐫𝐨𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲: Advanced SQL and PL/SQL skills for efficient database solutions. 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Proficient in JavaScript for dynamic and engaging user interfaces. 𝐑𝐞𝐩𝐨𝐫𝐭𝐬 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭: Strong command of Reports for insightful data visualization. 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: Seamless and secure integration of third-party services. 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬: Proven ability to build applications ready for future growth. 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗔𝘀𝘀𝘂𝗿𝗮𝗻𝗰𝗲: Meticulous attention to detail, ensuring reliable and bug-free applications. 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗮𝗻𝗱 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: - Delivered multiple complex Oracle APEX applications with exceptional user experiences. - Developed robust data models and integrated third-party services seamlessly. - Enhanced performance and efficiency of applications through optimization efforts. - Maintained a 100% on-time and on-budget delivery record, earning client trust and satisfaction. I am ready to bring my extensive expertise in Oracle APEX, web development, API integrations, Oracle Cloud Infrastructure, and Jasper Reports to your project. Let's collaborate to create a successful web application with robust reporting capabilities that exceeds your expectations. Let's make it happen!

Specialized in Systems Analysis and part-time maintenance (up to 20-30 hours/week) for legacy Powerbuilder / Oracle / Sybase / MS SQL Server environments. Productive on Day One. With over 20 years of specialized experience in PowerBuilder (v6.5 through v2022) and complex database environments, I provide the rare expertise needed to maintain, debug, and enhance mission-critical legacy applications. I specialize in the "plumbing" of legacy apps—ensuring stable SQLCA.DBMS connectivity and data integrity during system transitions. I possess the unique ability to step through established "black box" applications with little to no training, providing immediate value. Beyond coding, I bridge the gap between legacy systems and future goals by documenting existing functionality for developers, business analysts, and stakeholders to assist in eventual modernization strategies. Core Competencies: PowerBuilder Mastery: Expert work with PB versions 6.5, 8, 12.5, and 2016+, including the DIAMOND® Enterprise System and PFC frameworks. Database Expertise: Senior-level SQL, SQLCA.DBMS configuration, and Stored Procedure development for Oracle (Legacy to 19c), Sybase (v10, v12), and SQL Server. Modernized Documentation: I leverage modern AI-assisted tools to accelerate the analysis and summarization of legacy PowerScript logic, ensuring every finding is manually verified for technical accuracy. Industry Knowledge: Deep experience including Health Insurance (Diamond), Manufacturing, POS Systems, and Compliance Reporting. Whether you need urgent bug fixes, long-term system maintenance, or a technical guide to assist your modernization strategy, I am at ease collaborating with DBAs and Project Managers to deliver stable, documented results. Whether you need urgent bug fixes, long-term system maintenance, or a technical guide to assist your modernization strategy, I am at ease collaborating with DBAs and Project Managers to deliver stable, documented results.