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An PCB Engineer skillful with IoT product design. - Have designed lots of Carrier Board/HAT for CM5/CM4. - Proficient in microcontrollers (Arduino, ESP8266/ESP32, STM32, Raspberry Pi), SoCs, FPGAs and troubleshooting hardware/software issues. - Well-versed with hardware integration, sensor interfacing - Specialize in designing, analyzing, optimizing, and implementing PCB using tools like Altium Designer, EasyEDA and KiCad/OrCad. - Ensure signal integrity, power integrity, and thermal management in complex and multi-layer PCB designs. - Experienced with low-power electronics for battery-operated IoT devices and consumer products with power optimization strategies. - Designed several drones and IoT products with ESP32. - Familiar with BLDC motor contollers. - Experienced with GaN-based high power and SMPS -Excel in high-speed interfaces - USB3.x/HDMI/DP/MIPI(CSI, DSI)/Ethernet/PCIe/4G/LTE

I am Senior Engineer with 20 years' experience in product Research and Development, management of R&D, Embedded system design, specialized PCB design, technical consulting, production organization & product certification assistance. Providing the following services to the clients world-wide: ✔ Product R&D and design problem solving, ✔ Embedded system design (schematic, PCB design, firmware development), ✔ Specialized PCB design and optimization: ➕ Hi-speed industrial computers ➤ USB, ETH, HDMI, MII/RMII, miniPCIe, SDIO etc. ➕ Power electronics ➕ EMC optimization and problem solving ✔ Product cost evaluation and BOM optimization, ✔ Proof of concept & experimental devices, ✔ Technical consulting in system design and RF related solutions, ✔ Production organization & product certification assistance.

Embedded Systems | Firmware | PCB Design | Mechanical Design I help clients develop reliable prototypes and products in embedded systems, electronics, PCB design, and mechanical design. I have 3+ years of experience in the development of military/defense equipment, including UGVs, RCWs, and rocket subsystems, as well as prototyping medical, industrial, and musical equipment. Core skills: - Firmware development for MCUs (C/C++) on ARM platforms, STM32, ESP32, and Arduino; - Automation development on embedded systems and industrial equipment. - Industrial communications protocols knowledge (CANopen, Ethernet, EtherCAT, Serial and other) - PCB and circuit design; sensor integration; automation; - 3D/2D modeling and drafting; Fusion 360; AutoCAD; - MATLAB/Simulink; LabVIEW; C#; - 3D printing and prototyping. Available equipment: multiple ESP32, STM32, and Arduino platforms for prototyping, Ender 3 S1 Pro and Bambu Lab P1S 3D printers, and a Rigol DHO924S oscilloscope for testing and verification. I also have access to quick PCB and CNC production. Responsive, reliable, and focused on practical, on-time results.

I design reliable, production-ready hardware for embedded systems and connected devices. With over 10 years of experience in PCB design, I’ve completed more than 50 successful projects for 30+ satisfied clients, ranging from low-power IoT devices to complex, high-speed multilayer boards. My work is guided by clarity, attention to detail, and long-term maintainability, from schematic capture and layout to testing and DFM optimization. While I occasionally write simple firmware for validation purposes, my true expertise lies in crafting robust, efficient, and well-documented hardware platforms. 🔧 Core Expertise: 🛠️ PCB Design – Up to 12 layers, impedance-controlled, HDI and rigid-flex 📶 High-Speed Interfaces – PCIe (Gen1–Gen4), USB 2.0 / 3.x, HDMI, MIPI CSI/DSI, DDR2/3/4, LPDDR4, SATA, eMMC, SDIO, RGMII, SGMII, QSPI, LVDS 📐 Signal Integrity – Length matching, differential pair tuning, impedance control, eye diagram and crosstalk simulation 🔌 Power Systems – DC-DC converters, LDOs, PMICs, battery management, multi-rail sequencing 📊 Test & Bring-Up – Lab validation, accessible layout for probing, test firmware and diagnostics ⚙️ Design for Manufacturing – BOM and layout optimization for reliable and cost-effective production I’ve contributed to projects in consumer electronics, industrial automation, medical devices, agriculture, automotive systems, and even space-grade electronics. If you’re looking for a hardware designer who understands both the science behind a clean layout and the real-world demands of scalable production, I’d be happy to support your next project.

Hi, I’m Aleksandar – an embedded hardware engineer who helps companies turn ideas into real, reliable PCBs and embedded systems for motor control, IoT, robotics, audio and consumer products. For the past 10+ years I’ve been designing electronics that actually ship: from early block diagrams and first schematics, through PCB layout and firmware, all the way to tested prototypes and manufacturing files. I like owning the whole hardware + firmware stack so there are no gaps between disciplines. I don’t see this as a “one-off gig” type of work. I try to work as part of your team: asking the right questions, pushing back when something is risky, and making sure what we design is something you can build, test and maintain. What I do • Motor drivers for brushed and BLDC motors in high-precision actuators and motion systems • Embedded and single-board computer hardware + firmware (STM32, ESP32, SAM E5x/SAMD, etc.) • IoT devices with a focus on low power consumption and long battery life • Consumer electronics and small product PCBs (wearables, controllers, audio and wireless devices) • Communication and interface design: RS-232, RS-485, CAN, Ethernet and industrial buses • Bootloaders and firmware update solutions for different MCUs and transports • System design for multi-axis robotic systems: electronics, PCB and cabling • Manufacturing preparation: BOM cleanup, DFM, and coordination with vendors/CMs Tech stack • MCUs: STM32, SAM E5x/SAMD, ESP32, 8-bit MCUs • Tools: Altium Designer, KiCad, Fusion 360 • Firmware: C / Embedded C, RTOS How I work • Clear, staged milestones: requirements → schematic → PCB layout → prototype → bring-up → test report • Regular updates with screenshots, logs and measurements, so you always know where things stand • Careful documentation so another engineer can open the files months later and understand the design I work efficiently and aim to reduce total project cost by avoiding redesigns and dead ends. If you need someone who can take responsibility for both the electronics and the embedded side – and deliver something your team can build on – I’d be happy to talk.

Luka Knežević – Hardware Engineer & PCB Designer I am a highly experienced Hardware Developer and PCB Designer with over 5 years of professional engineering experience and more than 50 successfully completed projects ranging from low-power embedded systems to multi-kilowatt power electronics. My background spans high-performance LED drivers, motor control, energy systems, wearable devices, medical devices, NFC solutions, industrial controllers, and advanced multi-layer PCB design. I have deep experience in designing reliable, production-ready hardware using modern MCUs (ESP32, STM32, PIC, TI, C2000, Spartan 7 (AMD)), high-power topologies, battery systems, and a wide range of communication protocols. My lab is fully equipped for prototyping, testing, and validation, including oscilloscope work, precision measurements, firmware bring-up, and full board bring-up. ________________________________________ Professional Background • 5+ years of hardware engineering experience • 50+ completed projects, including: o Buck, boost, flyback, and PFC buck converters o BMS systems (1–16 cells) o E-bike inverter, motor control boards, motor drivers o E-bike chargers and high-efficiency power supplies o Nanosatellite power supply modules o Wearable devices (ultra low power + haptics + sensors) o Medical devices (Class A/B prototyping) o Industrial control cards (TI, ESP32, STM32, C2000, Spartan 7 (AMD)) o Wireless systems (BLE, Wi-Fi, LoRa, NFC) o Toys and consumer electronics o Rigid and rigid flex PCBs (2–16 layers) o Screen sterilization system controllers I have designed boards ranging from 1 to 16 layers, including rigid flex adapters, ultra compact wearable PCBs, motor control boards, high voltage/current power stages (up to 3 kW), and RF capable layouts. ________________________________________ Technical Expertise Hardware & Power Electronics • Topology selection: buck, boost, flyback, SEPIC, PFC buck, forward, synchronous drivers • Wide range power design up to 3 kW, switching frequencies up to 200 kHz • Battery systems: BMS, balancing, charging, MOSFET drivers • Motor control drivers (BLDC, brushed DC, E bike) PCB Design • Professional PCB layout using: o Altium Designer (primary) o KiCad, OrCAD, PCAD, EasyEDA • High density, mixed signal, high current, HV, and EMC safe design • Rigid flex, flex adapters, microcontroller modules, RF layouts • Full DFM/DFT optimization for production Communication Protocols • CAN, I²C, SPI, UART, RS485 • Bluetooth, Wi Fi, BLE Mesh, ESP NOW, LoRa • Ethernet LWIP, NFC, custom short-range communication Software & Simulation • MATLAB, Simulink, PSpice • LTspice, TINA, Altium simulations • Firmware bring up (ESP-IDF, STM32 HAL, Arduino) Prototyping & Testing • Soldering, rework, fault analysis • Gate driver tuning, feedback loop stabilization • Load testing, thermal evaluation, EMC preparation ________________________________________ Achievements • 1st Place – IFEC 2019 (E-bike drive) • 2nd Place – IFEC 2020 (Nanosatellite power supply) — Team Leader & Hardware Lead • Former CTO of a hardware startup (2 years) • Project Manager for solar power plant automation (1 year) • Over 50 projects and 1300+ billable hours on Upwork ________________________________________ Notable Project Types • Screen sterilization controllers (UV / chemical) • Wearable devices (IMU + LRA haptics + battery optimization) • Medical device prototyping • Power supplies (industrial, consumer, nanosatellite grade) • Custom rigid flex boards & adapters • NFC-triggered activation devices • Motor control & drive boards ________________________________________ Let’s Work Together Best regards, Luka Knežević