Hire the Best OpenX Specialists

I help businesses secure and optimize Linux infrastructure, firewalls, VPNs and virtualization environments. Specialized in: Network & Security: OPNsense | pfSense | Wazuh SIEM Wireless & Infrastructure: Ubiquiti UniFi Ecosystem Virtualization & Backup: Proxmox VE | Proxmox Backup Server VPN & Connectivity: WireGuard | OpenVPN | Cloudflare Tunnel SysAdmin & DevOps: Linux Servers | Docker | Reverse Proxy Core Services: Network Troubleshooting | Infrastructure Hardening I work mainly with: VPN issues Firewall configuration Secure remote access Reverse proxy problems Linux server deployments Monitoring and log analysis High availability environments I focus on fast troubleshooting, security best practices and stable infrastructure delivery. If you need someone to solve infrastructure and security problems quickly and professionally, let’s talk.

Hi my name is Ankush, I am the developer of Color Changer Camera and many other highly successful apps with over 1 Million Downloads. With 10 years of Software Development experience, I specialize in building complex, high-performance applications that stand out in the App Store. My apps—including Color Changer Camera, Vocal Trainer—have attracted over 1 million users worldwide. I bring deep technical expertise in areas that go beyond standard UI development, including real-time image processing, augmented reality, high-performance graphics (Metal, OpenGL), and audio/DSP integrations (MIDI, pitch detection). What I bring to your project: 10 Years of Mobile Excellence: Clean, maintainable, and scalable code for iOS and Android. Specialized Skillsets: Advanced knowledge of AR, real-time rendering, and complex audio logic. A Founder’s Mindset: I treat your app like my own. Having built and managed multiple apps with 500k+ users, I provide strategic insights into architecture, performance optimization, and user retention.

Senior FPGA Architect specializing in Xilinx Zynq and UltraScale+ platforms, delivering production-grade hardware architectures and high-performance embedded systems. I design scalable FPGA solutions from system architecture through RTL implementation, timing closure, Linux integration, and field deployment. My focus is building reliable, optimized, and maintainable systems — not just functional prototypes. Core Skills: FPGA Architecture & RTL Design -Verilog / VHDL (clean, timing-accurate RTL) -AXI4, AXI-Stream, AXI-Lite system design -High-throughput data pipelines -Custom IP core development -Timing closure & performance optimization -CDC handling and constraint strategy Xilinx Platforms -Zynq-7000 SoC -Zynq UltraScale+ MPSoC -Vivado (IP Integrator, Block Design, Constraints) -Vitis / SDK workflows Embedded Linux Integration -PetaLinux build systems -Device Tree customization -Kernel configuration & driver integration -U-Boot customization -PS–PL communication optimization Vision Acceleration & High-Speed Systems -Real-time image processing pipelines -MIPI CSI camera integration -Hardware acceleration using AXI-Stream architectures -DMA-based high-bandwidth transfers -Edge vision system optimization What I Deliver: -Clean and modular FPGA architecture -Production-ready Vivado & PetaLinux projects -Fully documented RTL and system design -Resource-optimized and timing-closed designs -Clear milestones and professional communication I work with startups, research teams, and industrial companies that require high-performance FPGA systems with long-term maintainability. If you need a Xilinx-focused architect who understands hardware, Linux, and system-level integration, I’m ready to support your project perfectly as you want from architecture to deployment.

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 build the systems behind programmatic advertising — real-time bidders, OpenRTB integrations, Prebid Server setups, and high-throughput pipelines that process billions of ad requests without breaking a sweat. If you're running an ad exchange, DSP, or SSP and need it to be fast, reliable, and scalable, that's my core work. What I specialize in: - Real-time bidding systems and OpenRTB 2.x integrations (DSP/SSP/ad exchange) - Prebid Server + mobile, GAM, and identity solutions (LiveRamp, ID5, UID2, TCF 2.0) - High-throughput backends in Go and Node.js/TypeScript - Data at scale: ClickHouse, PostgreSQL, MongoDB, Redis, Aerospike - Observability and infra: AWS, Docker, Prometheus/Grafana, OpenTelemetry Beyond ad-tech, I'm a full-stack engineer comfortable across React/Next.js front ends, Python, and AI/LLM integrations (RAG, embeddings) — so I can take a system from the data layer to a working interface. Recent work: I own and build a full programmatic ad-tech stack, currently evolving a DSP bidder service into a hybrid ad exchange — fanning out incoming SSP requests to external DSPs concurrently with an internal inventory auction, then running a unified final auction across both pools. I'm Top Rated with a 100% Job Success Score across 7 completed contracts. If you've got a bidding system, ad integration, or backend that needs to scale, send me a message with what you're building — I'll tell you honestly whether I'm the right fit.

I am a low-level systems engineer with 5+ years of experience in Windows kernel driver development, Linux kernel modules, C/C++, Rust, firmware, real-time telemetry, and performance-critical system components. I help companies design, debug, and ship stable low-level software, including kernel drivers, virtual devices, hardware-software integration layers, monitoring agents, and high-throughput system components. My core work includes: ✔ Windows kernel drivers using WDK, KMDF, and WDM ✔ Linux kernel modules and embedded Linux drivers ✔ Filter drivers, boot-start drivers, and virtual device drivers ✔ Virtual audio, input, network, and monitoring drivers ✔ WFP and ETW-based monitoring layers ✔ Kernel-to-user communication using IOCTL, shared memory, and IPC ✔ Driver debugging, BSOD analysis, and crash dump investigation ✔ Driver signing, HLK testing, and production deployment support ✔ C/C++ and Rust system-level tools ✔ Firmware, embedded systems, and hardware communication ✔ Real-time telemetry and high-throughput data pipelines ✔ Driver modernization, porting, and compatibility updates I focus on clean architecture, stable implementation, clear communication, and production-ready delivery. If your project needs deep low-level engineering support, I can help you design, build, debug, and ship it properly.