Hire the Best COBOL Programmers
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A 24/7 hardworking professional with 33 + years of experience using; RPG ILE, RPG Sockets programming, RPGILE Using JSON format, APIs Service programs, Excel Spreadsheets from RPG ILE, SQL embedded, on IBM i (AS400 - iSeries and S/3X environments). Python Back - End Developer. JTOpen Java Library. Strong experience as Systems administrator, I may work independently as well as part of a team. Education; Bachelors Degree in Computer Science. A.S Degree with Major in Information Systems.

I am Saul Hidalgo, a Computer Engineer, Senior Java Developer, and Founder of Saul Technologies, with more than 14 years of professional experience developing, maintaining, converting, and modernizing software. I have contributed to systems used in national security and defense in the United Kingdom, document management, financial modeling, oil and industrial companies, retail businesses, scientific applications, and universities such as Harvard Business Publishing. My main specialization is Java, but much of my work involves understanding complex existing systems, preserving their business logic, improving their architecture, migrating old technologies, and integrating software with databases, documents, hardware, and external services. My experience includes: • Java 8, 11, 17, and 21 • Spring Boot, Hibernate/JPA, Maven, Tomcat • JavaFX, Swing, and Eclipse RCP • REST APIs and system integrations • PostgreSQL, MariaDB, MySQL, and SQLite • Docker, Linux, Git, GitHub, Jira, and Slack • OpenKM customization and maintenance • Legacy software modernization • Code and algorithm conversion • POS, inventory, invoicing, and retail systems One of my longest-running projects was Debrief, a maritime-analysis platform used in defense and national-security environments in the United Kingdom. I worked as a core developer for approximately six years and made more than 1,250 contributions. My work included major features, maintenance, performance improvements, database integrations, user-interface components, media export, scripting integrations, and development related to Debrief NG and Debrief Lite. I also have extensive experience with OpenKM Document Management System. I have developed workflows, automations, scheduled tasks, reports, metadata functionality, REST and Java API integrations, authentication integrations, retention processes, backups, upgrades, and custom extensions. Another important area of my experience is legacy modernization and code conversion. Previous projects include: • Converting a complex financial Excel model into pure Java for Forio and Harvard Business Publishing • Translating more than 11,000 lines of Matlab code into C# for scientific simulations • Converting hundreds of Excel VBA macros into Go • Migrating Java applications to newer Java and library versions • Porting algorithms between Java, Go, Python, C, C++, C#, Delphi, VBA, and Matlab I do not treat code conversion as a simple line-by-line translation. I first understand the algorithms, data flow, dependencies, expected results, and edge cases, and then reproduce the same behavior in the target technology. For desktop applications, I have developed custom JavaFX, Swing, and Eclipse RCP systems with specific user-interface requirements, MVC architecture, bindings, reusable components, installers, database integrations, reports, file processing, and specialized calculation tools. I also have solid experience with POS and retail software. One of the systems I developed was deployed across 44 retail branches and included inventory management, invoicing, credit notes, fiscal and thermal printers, Zebra label printers, barcode readers, customer displays, user permissions, reports, and branch deployment. I have a strong background in algorithms, data structures, dynamic programming, graph algorithms, string processing, and performance optimization. I previously taught Algorithms Laboratories at Universidad Simón Bolívar using Java and Python. Before proposing a solution, I try to understand the real business requirement, current architecture, behavior that must be preserved, technical risks, and expected integrations. For well-defined projects, I can provide a fixed-price proposal and delivery plan. For maintenance, modernization, debugging, or work involving an existing codebase, I prefer to review the project first and provide a realistic estimate. You can review my public contributions on GitHub: saulhidalgoaular Please, do not hesitate to contact me and tell me about your project. Kind regards, Saul Hidalgo

I am a doctor scientist in computer graphics, with skills in virtual reality, games, image processing, data structures. competivive programming (algorithms),2D and 3D rendering, real-time animation, 3D navigation, product configuration, volume rendering... As a scientist, I look for the best solution for the problems, does not matter how complex it could be. My best programming skills are: c / c++ / opengl / shaders / webgl / jogl / threeJS / directX / java / javascript / html. I have strong experience direct show for audio processing, and MFC/Win32 API.

I’m a Software Developer with experience in full-stack web development and data automation, focused on building efficient, scalable, and business-oriented solutions. I specialize in backend development with Java and Spring Boot and frontend development with React and TypeScript, creating REST APIs, modern web applications, and automated workflows. I also have hands-on experience in data automation and reporting using Python, Google Apps Script, and Power BI, helping teams reduce manual work and make better data-driven decisions. I’ve worked on projects ranging from digital loyalty systems to process automation, reducing reporting times by up to 60% through automation. What I bring to your project: - Full-stack development (React, TypeScript, Java, Spring Boot) - REST APIs and database integration - Process automation and dashboards (Python, Power BI) - Clear communication and reliable delivery Let’s turn your ideas or data into practical, high-quality solutions. ___________________________________________________________________ Soy Desarrolladora de Software con experiencia en desarrollo web fullstack y automatización de procesos, enfocada en crear soluciones eficientes, escalables y orientadas a resultados. Me especializo en backend con Java y Spring Boot y frontend con React y TypeScript, desarrollando APIs REST, aplicaciones web modernas y flujos automatizados. Además, cuento con experiencia en automatización y análisis de datos usando Python, Google Apps Script y Power BI, ayudando a reducir trabajo manual y mejorar la toma de decisiones. He participado en proyectos como sistemas de fidelización digital y automatización de reportes, logrando reducir tiempos operativos hasta en un 60%. Puedo ayudarte con: - Desarrollo fullstack (React, TypeScript, Java, Spring Boot) - APIs REST y bases de datos - Automatización de procesos y dashboards - Comunicación clara y trabajo colaborativo Convirtamos tus ideas o datos en soluciones prácticas y de alto impacto.