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Hello! I'm Angel, an expert in firmware development for embedded systems. With years of experience creating quality firmware code and prototyping innovative ideas, I'm ready to bring your vision to life. In addition to firmware, I also offer basic CAD design and PCB layout services to speed up your development process. Whatever you imagine, let's work together to make it a reality. I look forward to hearing from you! 🔧 Core Technical Skills • Embedded Systems • Embedded Firmware • ESP32 • FreeRTOS / RTOS • Microcontrollers • IoT Development • C / C++ • Low Power Firmware • BLE (Bluetooth Low Energy) • Wi-Fi Integration • Sensor Integration • UART / SPI / I2C • ADC / DAC • Interrupts • GPIO Programming 💻 Hardware/Prototyping Tools • PCB Design • KiCad • Schematic Capture • Prototyping • JLCPCB • Hardware Debugging • Multimeter / Oscilloscope

13 years of experience in all aspects of RF design and high-speed PCB development, including antennas, RF front-end circuits, RFID systems, BLE/Wi-Fi/LoRa products, RF components, impedance matching, filters, amplifiers, RF switches, baluns, and antenna tuning. Much of my work has involved RF PCB design, wireless product development, and high-speed digital hardware. This background also extends to RFID readers, transponder-based systems, and FPGA-related hardware projects. I have strong experience in RF and antenna simulation using tools such as HFSS, CST Studio Suite, and Ansys tools for antenna design, RF matching, radiation pattern analysis, impedance optimization, RF front-end validation, and wireless performance improvement. I have strong experience in high-speed PCB design, including multilayer board layout, controlled impedance routing, differential pairs, signal integrity, power integrity, EMI/ESD protection, RF grounding, shielding, and manufacturability. I have worked on FPGA-related projects involving Xilinx, Zynq, Artix-7 FPGA platforms, including data acquisition, signal processing, timing-sensitive interfaces, and high-speed digital board design. My embedded hardware experience includes the setup, integration, and debugging of microcontrollers and embedded platforms such as STM32, ESP32, ESP32-S3, Nordic nRF52832/nRF52840, Raspberry Pi, Arduino, and embedded Linux-based systems. I am familiar with RF and wireless ICs/modules including Semtech SX12 series LoRa devices, Nordic BLE chips, ESP32 wireless modules, Quectel LTE/GPS modules, u-blox GPS modules, RFID reader modules, RF filters, LNAs, PAs, RF switches, baluns, and matching networks. For PCB design, I use Altium Designer, KiCad, EasyEDA, Eagle, and OrCAD I also have experience with enclosure design for RF and embedded products, including plastic and metal enclosures, antenna placement, RF keepout areas, mechanical fit checks, connector positioning, thermal considerations, waterproofing concepts, mounting features, and PCB-to-enclosure integration. I understand that enclosure design can directly affect RF performance, antenna efficiency, heat dissipation, usability, and manufacturability, so I always consider the mechanical structure together with the electronics. I have worked for years on IoT devices, wireless sensors, RFID products, antenna-integrated PCB designs, FPGA boards, digital electronics, embedded controllers, data acquisition systems, and prototype-to-production hardware. System engineering and integration have been important parts of many of my projects, especially where RF, firmware, FPGA, PCB design, and enclosure design must work together reliably. My main strength is not only designing a schematic or PCB, but building complete hardware that works reliably in the real world. I always consider RF performance, signal integrity, grounding, shielding, power stability, EMI/ESD protection, enclosure integration, manufacturability, testing, and long-term reliability from the beginning of the design.

SUMMARY: 1) A Problem Solver who enjoys learning new things, working hard, facing new challenges, and offering technical leadership to companies. 2) A Ph.D. specializing in the Research and Development of new products. 3) Excellent references for every job worked. 4) All previous positions ended only due to end of contract or the company suffered from financial issues. NO OTHER REASONS. 5) 25+ years of Engineering Work experience from low level to architecture design. 6) Highly experienced using all lab equipment, DMMs, Oscilloscopes, etc. 7) Excellent PCB schematic and layout skills for through hole and SMT designs and Cell Libraries with ProCAD, component purchasing, PCB and Cable assembly experience. 8) Superior software engineering and programming skills (programming maven), including embedded, in Verilog, VHDL, C/C++/C#, Assembly Language, Python, Java, PLC, OOP, and Design Patterns. 9) 25+ years in Embedded (Firmware) Engineering through entire development lifecycle. 10) Highly experienced in analog and digital electronics design, all aspects. 11) Digital electronics design & engineering a specialty. 12) A highly organized, energetic, thorough, detail oriented, and fast engineer, who always meets all goals and deadlines, set by Management. 13) A team player who enjoys working with other Engineering and Science professionals. 14) Highly developed written and verbal communication skills. 15) 25+ years of project management experience, taking products from concept through R&D, design, testing, tooling, sample manufacturing, UL safety certification, SGS RoHS testing, packaging design including graphic arts design and layout, offshore mass production, and overseas product freight delivery. 16) Has a great deal of entrepreneurial spirit, having done consulting for companies, through engineering R&D companies, for the last 25+ years. 17) Experienced at Design & Development of Electro-Mechanical products. 18) Experienced with injection molding parts, stamping metal parts, die cutting, PCB fabrication, printing, and mass assembly. 19) Highly experienced in design of high volume products. 20) DoD Secret Clearance obtainable if necessary.

Senior Windows & Cross-Platform Application Developer UWP • WPF • MAUI • Xamarin • WinForms • Bluetooth LE • IoT With 25+ years in software development, I build robust, high-performance desktop and mobile applications for the Windows ecosystem and beyond. My expertise spans the entire product lifecycle — from architecture and UI/UX to deployment — backed by hands-on experience with both waterfall and agile (Scrum) methodologies. What I Bring: deep Windows Stack Mastery: 20+ years creating production-grade apps with WPF, UWP, MAUI, Xamarin, classic WinForms and of course console applications. Bluetooth LE Specialist: Expert implementation of BLE services, GATT profiles, and device communication on Windows 10/11. IoT & Embedded: Extensive Arduino/ESP32 programming for telemetry, sensors, and consumer devices. Enterprise-Grade Quality: Delivered solutions for global leaders in telecom and energy, ensuring scalability, security, and maintainability. Technical Highlights: C# • .NET 4.8 → 8 • XAML • MVVM • WinUI 3 • Visual Studio • Git • REST/GraphQL • JSON/XML • SQL/SQLite • Unit & Integration Testing • CI/CD (GitHub Actions/Azure DevOps) • Performance Profiling & Optimization Why Hire Me? • fast, guaranteed results delivered strictly to your project requirements. • rapid, transparent communication and detailed status updates. • clean, well-documented code that your team can extend with confidence. • problem-solving mindset: I don’t just write code — I identify risks early and propose pragmatic solutions!

Most embedded/PCB freelancers specialize in one lane. I've spent 35+ years moving across all of them — IC layout, custom PCB design, embedded firmware, and full-stack software — which means I can take a project from a rough idea through working hardware and the dashboard that controls it, without handing it between specialists. A sample of what that's looked like in practice: a custom industrial communication protocol supporting 1000+ addressable nodes, a cloud-synced clock rendered identically on hardware and web, a mesh-network vibration datalogger for landscaping equipment, sensory prosthetic devices (two U.S. patents came out of that work), and more one-off PCB/firmware jobs than I can list — metal detectors, load cell combiners, stepper drivers, servo hubs, and precision lab instrumentation with full touchscreen control. Core stack: Eagle CAD for schematics/PCB, PIC Assembly and Arduino for firmware, Python/Flask/JavaScript/MySQL for the software side, and the usual embedded comms protocols (I2C, SPI, CAN, RS-485, MQTT). If your project spans hardware and software and you don't want to manage three contractors to get there, let's talk.

𝐈 𝐡𝐞𝐥𝐩 𝐟𝐨𝐮𝐧𝐝𝐞𝐫𝐬 𝐚𝐧𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭 𝐭𝐞𝐚𝐦𝐬 𝐭𝐮𝐫𝐧 𝐜𝐨𝐦𝐩𝐥𝐞𝐱 𝐡𝐚𝐫𝐝𝐰𝐚𝐫𝐞 𝐢𝐝𝐞𝐚𝐬 𝐢𝐧𝐭𝐨 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬. I’m a U.S.-based mechanical engineer with deep experience in full-stack hardware development; combining mechanical design, electronics integration, embedded prototyping, and manufacturing execution. I’ve engineered production systems and commercial products for companies including MakerBot (Method XL), Ultimaker, Stryker CMF, ULC Robotics, WAC Lighting, and other venture-backed hardware teams. Notably, I engineered a 3D printer at MakerBot and regularly develop and test prototypes using both SLA and FDM systems; giving me practical insight into real-world manufacturability. 🛠 What I Deliver 📌 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗛𝗮𝗿𝗱𝘄𝗮𝗿𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🔹 Concept development through production release 🔹 System-level thinking across mechanical + electrical 🔹 Clean, manufacturing-ready CAD architecture 📌 𝗠𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 🔹 SolidWorks (licensed), Creo 8.0 🔹 DFM for injection molding, sheet metal, CNC machining 🔹 Tolerance stack-ups & robust assemblies 🔹 BOMs and factory-ready drawings 📌 𝗘𝗹𝗲𝗰𝘁𝗿𝗼𝗻𝗶𝗰𝘀 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 🔹 PCB integration & mounting strategy 🔹 Sensor layout & enclosure design 🔹 Battery systems & thermal management 🔹 Design for EMI, safety, and reliability 📌 𝗘𝗺𝗯𝗲𝗱𝗱𝗲𝗱 & 𝗠𝗩𝗣 𝗣𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗶𝗻𝗴 🔹 Arduino & Raspberry Pi development 🔹 Python-based control logic 🔹 Functional demo units for testing or investor validation 📌 𝗥𝗮𝗽𝗶𝗱 𝗣𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗶𝗻𝗴 🔹 Functional enclosures, mechanisms, and validation rigs 🔹 In-house SLA + FDM prototyping 🔹 Fast iteration cycles before tooling investment ✨I’m not just a CAD modeler; I build systems that work in the real world. If you need a designer and technical partner who can think beyond parts and deliver manufacturable, production-grade hardware, I’m ready to help. 📩 Send an invite and let’s discuss your product