I am an electronics engineer with over 10 years of experience specializing in PCB design for consumer, IoT, and industrial products. My work covers complete PCB design development, including schematic capture, multilayer and HDI PCB design, mixed-signal and RF layout, and production-ready file preparation. I focus on clean stack-up planning, signal integrity, thermal management, and manufacturability to ensure each PCB design is reliable, compact, and scalable for mass production. Core Expertise • Custom schematic design and multilayer PCB layout • High-current, mixed-signal, and RF board design • Power supply and battery management circuits • Embedded firmware development in C/C++ • ESP32, STM32, nRF52, ARM Cortex MCUs • BLE, WiFi, LTE, GPS integration • Sensor integration (I2C, SPI, UART, ADC, PWM) • Low-power optimization • OTA firmware updates • Manufacturing-ready deliverables (Gerber, BOM, Pick & Place) My Approach I design hardware with firmware integration in mind from the beginning. This reduces redesign cycles and ensures stable bring-up. My process includes: • Architecture definition • Component selection based on performance and availability • Signal integrity and thermal-aware PCB layout • Firmware driver development and system integration • Prototype debugging and validation • Production file preparation I focus on clean routing, solid grounding strategy, stable power architecture, and scalable firmware structure. If you are looking for someone who understands both hardware and firmware and can deliver a complete, reliable embedded solution, I would be glad to support your project.

Hello world!!! My name is Hiep, I am an embedded hardware design engineer. My expertise is designing hardware circuits, assembling, and testing the quality of the circuit. Give me your requirements or your product specification, and then we can discuss the timeline, cost, and how we can work together. Also, I have more than +8100 working hours, 100% Job Success on Upwork, and more than 8 years of experience in designing hardware for IoT Products, Consumer Products, and Edge devices, so I think I can use my experience to complete your project with the best result. + MY WORKFLOW: - Receive your detailed requirements or specifications, discuss what you want and what I need to do. - Design block diagram for the circuit: needs to be very detailed, it will decide what part will be used in the project. - Design schematics: follow the block diagram to design the schematic for the product. - Design PCB Layout: with requirements about Mechanical Design and Industrial Design, I will do the PCB Layout to fit with your Mechanical Design to achieve the best performance. - Extract production data: BOM, CAD, GERBER, DESIGN, ASSEMBLY GUIDELINE, IMPEDANCE CONTROL REQUIREMENTS, ... + MY TECHNICAL EXPERIENCES: - SoC/ MCU: STM32F0/F1/F2/F4/F7/H7, STM32L1/L4, MSP430, MSP432, ATMEGA, ATSAM, PIC, ESP8266, ESP32, CC2530, CC2538, nRF52810/ nRF51822/ nRF52832/ nRF52840/ nRF5340, ... - Sensor: light sensor, CO, Smoke Sensor, Dust Sensor, Air Sensor, pH sensor, IMU sensor, Accelero, Gyro sensor. - Biosensor SPO2/PPG (OB1203, MAX32664 sensor hub, MAX86176, MAX86178, AFE4950…), Skin temperature (AS6221, MAX30205, MAX30208), ECG (ADS1292, ADS1293, ADS1294, ADS1298, MAX86150, MAX30003,…), Heart rate, Blood pressure,... - True wireless earbuds, headsets and speakers, Bluetooth ® LE Audio standard from Qualcomm: QCC5141, QCC5171, QCC5181,... - Wireless communication: DA16200 BLE MCU, WiFi, BLE4.0/4.1/5.2, Lora, Zigbee, NFC, eSIM, GNSS/GPRS/4G/LTE Module: SIM900A, SIM908, Quectel MC60/M95/EG91x, SIM7600, SIM7080, SIM7090G... - Digital and high-speed electronics design: - Memories DDRx/LPDDRx, SDRAM, Camera and display interfaces (MIPI-DSI, MIPI-CSI, DisplayPort, etc), Data communication interfaces (QSPI, SPI, UART, I2C, FMC, I2S, USB 2/3.x, etc), ( - RF Designs: 1-6 GHz (UWB, Wifi, BLE, ZigBee, GPS, NB-IoT, LTE-M/LTE, Z-Wave, etc), 13,6 MHz, 128 kHz (NFC, RFID, etc), 433 MHz (Custom protocols). - Some industry circuits: Modbus, voltage to current/current to voltage converter, isolation interface, current/voltage measurement,… - Ultra-low power consumption device hardware developments: Ultra-low locker using non-rechargeable battery with life-span of up to 10 years, some wireless devices with 2 years operation with 620mAh battery,… - Power electronics: wireless charger, high power PD charger, BMS, PMIC, OV/OC/UV, high current PCB (30 – 100A),… - Mass Production: Discussing, processing steps, and managing the manufacturing process of PCBs, PCBAs, and assembly devices, processes in production include: discussing with the bare PCB factory, building self-test documents, production testing PCBAs at the factory, documenting and testing, and managing the device testing process after assembling the device. - Tools: Altium Designer (Altium365/CircuitMarker), KiCAD, Eagle, EasyEDA; OrCAD, PSpice, CAM350. - Prototyping: Experience with BOM creation (Digikey/Mouser/JLCPCB) and combining dimensional drawings into precise Gerber formats. - CAD/3D design tool: SolidWorks, Inventor... + Some of the products that I have designed and released to the market: - IoT products: Wearable devices tracking the biological index, Devices control hub over Wifi, Internet, Bluetooth, OBD devices,... - Smart Home Product: Design Home Gateway with Ethernet, WiFi, Zigbee, TFT LCD, ... Design Smart Switch with capacitive touch, Zigbee communication, 220VAC/110VAC load control, ... - Tracking Device: Using 3G/4G with GPS, this device is used for personal tracking ... and a lot of other products ... I hope to work with you, to help you complete your project and release your product to the market Best regards Hiep Le

Software programmer with Linux, Windows development knowledge, more than 15 years of experience. C, C++, C#, Assembly, Python, Javascript, Golang, Fortran, Rust, Bash, Powershell. Compilers, debuggers, build tools, repository tools, libraries, frameworks, numerical and data processing.

**HVAC Systems Designer | Embedded Controls Developer | Energy Efficiency Specialist** With over 23 years of experience in designing HVAC systems and energy-efficient solutions, I help clients optimize climate control across a wide range of buildings — from small residential homes to large warehouses, offices, and commercial facilities. My designs are implemented and maintained under my direct supervision, giving me a full understanding of the system lifecycle and ensuring long-term reliability. 🔧 **HVAC Design & Engineering** - Expert in Autodesk AutoCAD MEP for HVAC system design - Proven experience in heating, cooling, and ventilation solutions tailored to building type and usage - Lifecycle-based design decisions for optimal performance and maintainability - Hands-on supervision of system assembly and maintenance 💡 **Smart Automation & Embedded Systems** - 12+ years developing cost-effective programmable controllers (ESP32, Arduino, Raspberry Pi) - Custom PCB design and prototyping (in-house or outsourced) - Web-based interfaces with smartphone control for intuitive system management - Integration of smart algorithms for HVAC, boiler rooms, and heat pumps 📊 **Energy Modeling & Consumption Analysis** - Experience with OpenStudio + EnergyPlus for building energy simulations - Accurate assessment of heating, cooling, ventilation, and lighting needs 🧠 **Legacy System Integration** - 16+ years working with TAC Xenta and Schneider Electric Xenta controllers - Skilled in TAC Vista software and application development for legacy systems I combine deep technical knowledge with practical implementation skills to deliver efficient, scalable, and intelligent building systems. Let’s work together to bring your project to life — from concept to commissioning.

My name is Abhinav Murali, I hail from India. I am Nanotechnologist by profession, at the moment, I am working as a Product R&D Consultant, majorly emphasizing on the Research and Development of nanotechnology-based energy devices, Electric vehicle power train design and modelling, mechatronics systems, advanced air and water purification research, precision equipment for laboratories, microelectronics research, Carbon capture material research, FET fabrication, DSSC solar cells, organic LED, MOSFET & VARACTOR fabrication, sterling engines, hydrogen-powered engines, micro devices for medical application, and Nano photocatalytic water purification. Regarding my education background, I did my Bachelor’s degree in Mechanical engineering and my Masters in Nanotechnology and material Science Research. My skills include, 3d modelling &Rendering: AUTO CAD/SOLIDWORKS/SKETCHUP/KEYSHOT Simulation: MATLAB, ANSYS/COMSOL. Platforms: ANDROID, C, ARDUINO, RASPBERRY PI, Circuit deign: ALTIUM, KIKCAD, Easy_Eda Nano tech; material characterization (XRD, SEM, UV SPC, TEM, XPS, FTIR RAMAN ETC). Concerning my experience, I have worked in the domain for over 7 years, where my focus was on product Design and Development, Rapid prototyping and engineering simulation. I have also had the privilege of working with many product development projects, some of them are 1. Microfluidic apparatus design, modelling and fabrication for neuron isolation and study. 2. Nano fluid formulation 3. PID controller for CNC desktop machine 4. Electromagnetic reciprocating engine design and prototyping 5. Stirling engine based solar energy harvester (light to electricity conversion) 6. 3d printer prototyping (firmware and hardware work) 7. Thermal management system design for engines and transformers (CFD) 8. Bio-degradable plastic formulation 9. Heat resistant roofing tiles (whether resistant bio-composite) 10. Self-cleaning nanomaterial-based coatings 11. Nano fluid based lubricant formulation for motors and alternators. 12. IoT enabled precision robotic control system design 13. Organic shoe polish formulation (honey wax-based) 14: face steamer cum massager product design 15: surgery tool sanitizer automatic 16. Fault inspection and material sorting machine (plastic gear) 17. Fuel cell-based mobile power banks 18. Electric car power train assembly (hybrid) 19. VARACTOR modelling and fabrication 20. Portable electronics devices (IoT sensor-based) 21. Nail polish and remover formulation 22. Air cathode fabrication using Nano carbon/ graphite/core shell nanostructures) 23. Hot rolling machine for prismatic cells manufacturing (battery) 24. Costume made glove box for chemical labs 25. Battery cell monitoring circuit design. 26. LI-Ion- super cap integrated module for electric cars. I have access to machine labs and product development facilities, moreover have guidance and support from two top research institutes in the country. Kindly let me know if you are interested in working with me, also, please know that I would be happy to sign an NDA if it’s a requirement. Thank you for your time.

I work at the two hard ends of software - software reverse engineering, and building high-performance systems where being fast and reliable is MUST. 10+ years of experience, Top Rated, 100% Job Success Score. 𝗥𝗲𝘃𝗲𝗿𝘀𝗲 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗮𝗻𝗱 𝗗𝗲𝗼𝗯𝗳𝘂𝘀𝗰𝗮𝘁𝗶𝗼𝗻 Devirtualization of protected and virtualized software, x86 disassembly, and logic recovery. I'm comfortable in heavily obfuscated binaries using IDA Pro, Ghidra, x64dbg, and WinDbg. 𝗛𝗶𝗴𝗵-𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗕𝗮𝗰𝗸𝗲𝗻𝗱𝘀 (𝗚𝗼) Payment processing, transactional platforms, custom marketplaces, and high-throughput automation and API integration. Built for reliability and scale where downtime and rounding errors both cost real money. 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗥𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝗮𝗻𝗱 𝗕𝗶𝗻𝗮𝗿𝘆 𝗔𝗻𝗮𝗹𝘆𝘀𝗶𝘀 Static and dynamic analysis, malware analysis, protocol reverse engineering, and Windows NT internals - kernel and user mode. I also build the defensive side: application protection, licensing systems, and anti-reversing tooling. 𝗠𝗮𝘁𝗵-𝗛𝗲𝗮𝘃𝘆 & 𝗣𝗿𝗼𝗯𝗮𝗯𝗶𝗹𝗶𝘀𝘁𝗶𝗰 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 RNG, payout engines, and gaming logic where correctness is non-negotiable and a single bad edge case is a real liability 𝗪𝗵𝗮𝘁 𝗜 𝗕𝗿𝗶𝗻𝗴 🌱 Deep low-level expertise - C++, C, Go, Windows internals, x86 🌱 Equal ability to tear a system apart or build one that can't break 🌱 Senior judgment, clean and maintainable code, and honest timelines Feel free to message me, I'm happy to look at your problem and give you a straight answer on whether I'm the right fit and how I'd approach it

Experienced Digital IC Design Engineer and RTL Coding Expert, SoC specialist offering FPGA/ASIC RTL Coding in Verilog, SystemVerilog, and VHDL, with Multilingual Tutoring. Available Round-the-Clock | Flexible Pricing | Prioritizing Service Excellence My Experience: I've worked extensively with CPUs, Computer Archecture, Digital Electronics, Assembly Languages and HDL coding. For ASIC design, I've harnessed the power of Synopsys tools, employing both TCL scripts and GUI. I am also proficient in documenting designs using three methods: LaTeX, and Microsoft Word. My portfolio showcases a diverse array of complex designs across fields like image processing, cryptography, communication protocols, and processors, all implemented using HDLs. Reach out to discuss the details, and I'll be here to assist you at any time. Your success is my priority. Key Skills: - Digital IC design - RTL Coding using Verilog/SystemVerilog and VHDL - Simulation and debugging using QuestaSim/ModelSim - Computer Archecture design (ARM, RISC-V, X86) and Assembly Language coding. - FPGA/ASIC flow - Communication protocols such as: UART - SPI - I2C - AXI - Programming languages such as: Python • C/C++. - Knowledge in scripting Language : TCL. Through these skills and various projects I have improved my technical skills, applied my knowledge and grown my network with people around the globe. Tools: Vivado IDE • Quartus prime • VS Code • Xilinx ISE • ModelSim/QuestaSim • Synopsys Deesign Compiler •MATLAB • Git/GitHub • Notepad++.

🚀 If your product needs to scale without breaking - that’s where I help. I build and support web & mobile applications that are stable in production, easy to extend, and ready for real users - not just demos. 🛠 My specialization Full-stack development for long-term products using React, React Native, Node.js, Next.js, Nest.js, and Python. I work with REST & GraphQL APIs, modern frontend architecture, and reliable backend systems backed by MongoDB, PostgreSQL, and MySQL. 💡 What you get as a client 🔹 Clean, maintainable code that doesn’t fall apart after launch 🔹 Fewer bugs thanks to structured development and QA-first thinking 🔹 Systems ready for growth: users, traffic, features 🔹 Clear communication and predictable delivery in remote teams 🌍 📌 Where I add the most value FinTech, Blockchain, SaaS, E-commerce, ERP, CRM, and data-driven platforms - especially projects with complex logic, integrations, or high load. 🏆 Proof points 🔹 I have 10 years of experience in web and mobile application development 🔹 Delivered 20+ production projects, including: 🚀 a blockchain banking platform with 50,000+ active users 🚀 a large SaaS system for UK government civil servants 🔹 Experience scaling engineering teams from 50 to 200+ developers while keeping delivery stable 🤝 How I work Fluent English, full remote experience, comfortable across time zones. I focus on business outcomes, code quality, and long-term system stability - not just “closing tasks”. ❓ Let’s start with one question What are you building right now, and which part of the system worries you most?

As a seasoned freelance programmer with a strong foundation in security and Unix systems, I bring a wealth of expertise to the realm of software development. With a passion for tackling complex challenges, I specialize in full-stack development, reverse engineering, and imparting knowledge through tutoring. Technical Proficiency: - Programming Languages: Proficient in a diverse range of languages including Python, Java, Ruby, Perl, C, JavaScript, and more! - Security Expertise: Extensive experience in identifying and mitigating security vulnerabilities. Adept at conducting penetration testing, threat modeling, and implementing robust security measures. - Unix Mastery: In-depth understanding of Unix-based systems, with a focus on Linux. Capable of optimizing system performance and ensuring the security and stability of Unix environments. Full Stack Development: - Frontend: Skilled in crafting responsive and user-friendly interfaces using HTML, CSS, and JavaScript frameworks such as React and Angular. Backend: Experienced in developing scalable server-side applications with proficiency in Node.js, Django, and Flask. Database Management: Proficient in designing and implementing databases using MySQL, PostgreSQL, and MongoDB. Reverse Engineering: - Binary Analysis: Expertise in reverse engineering and analyzing binaries to uncover vulnerabilities and enhance software security. Tutoring and Mentorship: - Educational Background: Possessing a comprehensive understanding of programming fundamentals, security concepts, and Unix systems, I am adept at conveying complex ideas in an accessible manner. - Mentorship: Committed to fostering the growth of aspiring developers through personalized guidance, code reviews, and hands-on mentorship. Additional Skills: - DevOps: Proficient in implementing CI/CD pipelines, containerization (Docker), and orchestration (Kubernetes) for streamlined development and deployment processes. - Networking: Knowledgeable in networking protocols, firewall configurations, and VPN setups to ensure robust and secure communication. - Cloud technologies: AWS, GCP, and Azure. Professional Approach: - Problem Solver: Known for my analytical mindset and creative problem-solving skills, I thrive in dynamic environments and excel at finding innovative solutions to intricate challenges. - Collaborative Team Player: Effective in cross-functional collaborations, I communicate technical concepts to both technical and non-technical stakeholders, fostering a cohesive and productive working atmosphere. With a commitment to continuous learning and a track record of delivering high-quality solutions, I am well-equipped to contribute to projects requiring a versatile and experienced freelance programmer with a focus on security and Unix environments.

🔬 Reverse Engineering & Security Analysis Binary analysis for security vulnerabilities, legacy system documentation, and interoperability Software activation integrity assessment to help vendors protect their IP Firmware unpacking, bootloader analysis, and embedded system forensics APK decompilation for security auditing and compliance 🛡️ Anti-Cheat Consulting & Game Integrity Reverse engineering of cheating tools to help game studios improve detection Design and audit of kernel-level anti-cheat systems (Windows, Linux) Memory integrity verification, handle stripping, and hypervisor-assisted detection Threat intelligence on cheat marketplaces and subscription models to strengthen product defense ☣️ Malware, Rootkit & Threat Analysis Full dissection of ransomware, backdoors, infostealers, and banking trojans Kernel-mode rootkit and bootkit forensics (DKOM, SSDT hooks, IRP filtering) Threat intelligence reporting with custom Yara rule creation Incident response support: rootkit and ransomware removal from servers and workstations 🔐 VPN & Network Security VPN setup, troubleshooting, and hardening (WireGuard, OpenVPN, IPsec) Traffic analysis, firewall configuration, and network segmentation Deep packet inspection (DPI) and protocol analysis for anomaly detection Secure infrastructure design for high-risk environments (journalists, activists, enterprises)