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 have always enjoyed supporting others with their projects while learning something new. Having had the privilege of working alongside great colleagues, I have accumulated a wealth of knowledge that I would like to use to help others and make their projects come to fruition. My personal motto is "Do the work that you can be proud of." I am excited at the prospect of assisting you in moving your project forward."

Experienced Entrepreneur with a demonstrated history of working in the software industry since 25+ years. Skilled in • C++ * C++ modules like CPPRESTSDK, cpp_redis, redis++, boost, jwt-cpp, ODB++ etc. • Win32 • MFC • Visual Studio • C# • WPF • .Net • Pine Script • WSL • Linux utilities/services • AWS • Docker • Blockchain • MQTT, Node.js • React.js • Next.js • Node.js • Requirements Analysis • PHP • Python • Fortran • PLC • SCADA • DLMS/COSEM • Agile Methodologies • Embedded Programing/Firmware • GigE / USB (GenICam) Industrial Vision Camera (Baumer, Matrix, HikRobot) • HikRobot VisionMaster Library SDK for image processing (C# and C++) • RS232/RS485/MODBUS I carry huge experience in • NLP • Vision software • OCR/OCV • OpenCV • CAD/CAM • Smart Meter • DLMS/COSEM • Smart Meter Control Software • GuruX • Smart Meter Calibration • AS Test Bench/CALMATE for Electric meter calibration/accuracy full/semi automatic • Automation • Telemetry • Algo Trading • MetaTrader • Tradingview • CTrader * AGGrid Experienced in working with broad range of microcontrollers including • NRF51822 • NRF52832 • STM32F4 • STM32F0 • STM32F1 • STM32L1 • STM32L4 • STM32H5 • NXP RT1050 • PIC32MX • MSP430 • STM8S • STM8L • PIC16 • 8051 Expertise in a wide array of industry verticals, such as metering (Electricity and Water), fire safety, data loggers (Battery operated), streetlight, and wearables Strong background in designing and developing firmware architecture and solutions Proficient in both wired and wireless communication technologies and interfacing the same, including BLE, Wi-Fi, Ethernet, and Cellular Deep understanding of DLMS/COSEM metering protocols, integration of the same and also experienced in certifying meter with DLMS stack through CTI file and CTT tool. Experienced in implementing DLMS with various interface profiles, including HDLC-based serial profiles for meter communication over Optical, RS485, and RS232 interfaces. Additionally skilled in using TCP-based wrapper profiles for seamless communication with meters over Ethernet and Cellular networks Advanced in C programming, with familiarity in C# and Python for supporting tools and utilities. Well-versed in various IDEs and version control tools such as SVN and Git Experienced with various MCU interfaces including SPI, I2C, ADC, DAC, Timers, DMA, UART, CAN, LTDC, MPU, Flexible memory controller, FlexSPI-Quad SPI Extensive experience development on FreeRTOS-based development and also bare-metal development Deep understanding of low-power design, battery-operated products, and efficient power management techniques Expertise in secondary bootloader development, secure firmware upgrades, and troubleshooting complex firmware issues No matter what you are after, a proof of concept, maybe an MVP, architecture or a full fledged app, I'd be eager to help you realize your idea and accomplish your goals.

I'm passionate about web development and coding. I enjoy writing clean code and coming up with the best solutions that follow best practices. I'm fully confident in my abilities as a web developer. I've taken a leadership role in many projects and assist other developers when needed. I always strive to be a better developer. I'm open to other ideas. I'm very professional and respectful with all of my clients. See below for detailed lists of languages, frameworks, libraries, etc. that I have experience with: Languages: C# JavaScript SQL HTML CSS SCSS Frameworks: Bootstrap .NET React CMS Platforms: WordPress Craft CMS Databases: MSSQL MySQL APIs: Acuity Slack Square ShipEngine CorPay ElevenLabs JavaScript Libraries/Plugins: jQuery Nutrient Viewer (formally PSPDFKit) Telerik Kendo UI Chart.js Chosen jQuery ClockPicker bootstrap-datepicker DataTables DropZone.js Font Awesome FormValidation.io FullCalendar iCheck Inputmask jQuery Typeahead jQuery UI jquery-ajax-unobtrusive JSZip jszip-utils Ladda Buttons Parsley pdf.js QRCode.js Summernote SweetAlert2 Toastr .NET NuGet Packages: Entity Framework HtmlSanitizer Telerik Document Processing Newtonsoft.Json Persits.PDF.dll LinqKit.Microsoft.EntityFrameworkCore .NET Identity NLog ExcelDataReader NHapi ServiceStack.Text Square ConsoleTables AWSSDK.S3 Pomelo.EntityFrameworkCore.MySql PuppeteerSharp Stubble.Core mustache-sharp PdfSharpCore Version Control Systems: Git IDEs and Tools: Microsoft Visual Studio 2022/2026 Sourcetree Notepad++ SQL Server Management Studio MySQL Workbench WinSCP Putty

Hi, I am an applied mathematics graduate with years of experience in teaching calculus, linear algebra, numerical methods, statistics, and differential equations. My area of interest is numerical simulation using finite difference and finite volume methods. I have expertise in MATLAB, MATHEMATICA, Python, FORTRAN and C++, Excel, Google Sheets, Overleaf, LaTeX, and SPSS. I also have certifications in Data Analytics, Data Science, Machine Learning, and Deep Learning.

Hi, I am a scientist developer, with problem solving being my biggest skill. I code mathematical models to understand Nature's important questions but I am also interested in what algorithms, statistics and programming can achieve in the real world, not only at the blackboards. I am highly experienced in developing and designing mathematical models, optimization procedures and statistical data analysis.

I help researchers and engineers turn complex material concepts into simulation-ready models — saving weeks of setup, debugging, and validation work. I provide: 1) Realistic polycrystals with grain boundaries, precipitates, and tailored microstructures 2) Custom grain boundaries with specified misorientation, absorbed dislocations, and interface engineering 3) Physically accurate defects such as dislocations and twins embedded directly into grains Unlike generic structure builders, my models are energetically minimized and validated, making them immediately usable in simulations. No extra setup or debugging required. Whether for publications, advanced materials R&D, or industrial testing, I deliver high-quality, customized atomic structures ready for visualization in OVITO or direct simulation in LAMMPS. ---

Lead C/C++ engineer, 18+ years, specialising in algorithm-heavy systems: computational geometry, 3D graphics, desktop applications and performance-critical code. Work I've built has shipped into simulation software adopted by Apple and Airbus, AAA game engines at Ubisoft, BMW and Panasonic vehicle systems, and a CME-certified trading platform. WHAT I DO BEST - Hard algorithmic problems - computational geometry, spatial optimisation, 2D/3D linear algebra, multithreading - C/C++ systems and desktop applications - Qt, STL, Win32 API, Linux/POSIX, CMake - Legacy debugging others have given up on - undocumented code, original authors long gone, intermittent faults - Technical project management - Agile/Scrum, JIRA administration, roadmaps, hiring, team leadership SELECTED RESULTS - Built "Human Exposure Analysis" solo in 3 months: skeleton-driven positioning of voxel human body models, a capability no competing EM simulation vendor offered at the time. The deciding functionality behind Apple adopting the software. - Co-developed a shortest-path solver across 3D surfaces with obstacles (Dijkstra, custom raster optimisations, multithreading), built for Airbus to compute minimum cable runs between aircraft antennas. - Automated optimal packing of mixed-diameter cable bundles to minimise cross-section, replacing a manual process in automotive wiring. - Led the C/C++ team on broadcast IP video at Imagine Communications: EpicMV multiview monitoring and the Selenio Network Processor. - Built a DropCopy client for a high-frequency trading platform and took it through CME AutoCert+ certification. - Cloth simulation for Ubisoft's in-house game engine across PC, PS4 and Xbox One. - Automated ceiling pattern layout for Autodesk Revit in C# .NET, respecting obstacles, bounds and varying pattern structures. HOW I WORK I own the whole problem: requirements, architecture, implementation, testing and delivery. I tell you up front what I cover and where you would need another specialist, so you get a realistic plan rather than an optimistic one. I also take web projects end to end. Most recently a bilingual production site from idea to launch in 3 weeks, solo: domain, Cloudflare infrastructure, build and release. Send me the problem rather than the spec. Deciding what to build is usually the hard part. CAPACITY I also run a small agency on Upwork (Smart Fox), so I can bring in an additional engineer when a project needs more than one pair of hands, or deliver through the agency if that suits your procurement better.

Extensive Fortran and spreadsheet programming. Managed (from Office) construction of steel mill structural building in Vera Cruz, Mexico. Extensive project estimating and steel design with Excel.

Aerospace/Systems engineer and geophysics researcher with industry experience including full time work with publicly traded companies such as BWXT and MDA Space, small startups, and government entities such as European Space Agency and Canadian Space Agency. I have worked on projects developing solutions for various industries including aerospace, maritime, biomedical, nuclear, finance, textile, as well as academia. - 700k+ USD in successful grant proposals to European Space Agency and Canadian Space Agency for R&D work - Worked my way up from freelancer to shareholding Chief Science Officer position within a small startup, leading development on custom laser tooling to TRL 8, passing Acceptance Test Plans (ATPs) and numerous technical demos for industry leaders, establishing the startup as laser tooling supplier. Heavily utilised C++, Python and Matlab, sensor fusion and point cloud registration algorithms - Led development of novel surveying system for the construction industry: design, component selection, embedded firmware and algorithm development utilizing laser rangefinder, servo motors, USB, PELCO-D camera protocol, CANbus, RS-485, UART and WiFi comms - Worked in CI/CD team developing algorithms for biomedical company, utilising NumPy, SciPy and Pandas among other packages - Utilised SAR and multispectral data (Sentinel 1 and 2) for Earth Observation projects to monitor grassland yields for an agriculture startup