Hire the Best Firmware Engineers
in the United Kingdom

Embedded firmware development, bare-bone and linux based devices. Have done various projects involving IoT, WiFi, sigfox, AWS cloud, multiple sensors and microcontrollers. Also experienced in payments industry - EMV and PCI certification, NFC, L1, L2 kernels

Hello, Everyone! I am an embedded systems engineer, PCB designer, and firmware developer with over 10 years of professional experience. I provide complete, end-to-end solutions for a wide range of electronic device designs, supporting clients from initial concept and schematic design to PCB layout, prototyping, assembly, and full system testing. I have strong expertise in high-speed PCB design, including PCIe and DDR4 routing, as well as precise impedance matching for reliable performance at high frequencies. I also specialize in RF and antenna design for modern IoT devices, ensuring optimal signal integrity and system efficiency. In addition, I have deep experience in ultra-low power design, achieving microamp and sub-microamp current consumption for battery-operated and wearable systems. I specialize in firmware development for LTE-GPS-LoRa-BLE-based embedded systems (nRF52 series), including low-power optimization and high-precision sensor acquisition. My focus is on delivering robust, production-ready solutions with high reliability and performance. 🔥 Main Skills 👉Embedded Systems 👉Schematic Circuit Design(Low Power consumption Design) 👉Firmware Development(All Microcontrollers-STM32, TMS320, ESP32, FPGA, nRF52, Raspberry PI) 👉PCB Design(High speed signal routing, PCIe, DDR4, 18 multi-Layers Design, RF antenna Design,) using Altium Designer, KiCad, EasyEDA, Fusion 360(No problem in DFM-JLCPCB) 👉IoT with nRF52(BLE), LoRa(for example, SX1262), LTE(SIM card interface), GPS and other variety of sensors 🛠️Tools & Technologies: 👉 nRF5 SDK / nRF Connect SDK 👉SEGGER Embedded Studio + J-Link debugging 👉 C/C++ (bare-metal & RTOS) 👉 BLE GATT, LTE AT commanders, custom wireless protocols 👉SPI / I2C / UART / ADC integration 👉Low-noise measurement systems (nA level) 👉STM32CubeIDE, Cube MX, Keil, CCS, Arduino, ... 👉MQTT, Free RTOS, Zephyr RTOS 🚀 I can support your project from concept to production.

From concept to tested prototype, I design high-performance PCBs and embedded systems for startups, engineers, and product teams who need results that work the first time. With 8 years of experience in embedded systems and hardware design, I specialize in creating production-ready electronics that are efficient, reliable, and built for scale. Whether you're developing a new product or improving an existing design, I bring the technical expertise and problem-solving mindset to get it done right the first time. 💡 What I Offer: 🔹 Embedded System Development: ARM Cortex, STM32, ESP32 🔹 Advanced PCB Design: From 2-layer to complex multilayer boards with BGA, RF, and high-speed signals 🔹 Cost-Effective Engineering: Focused on value without compromising quality 🔹 Rapid Prototyping: Helping you move from idea to working prototype quickly 🔧 Core Technical Skills: ✔️ Analog & Power Circuit Design: LED drivers, SMPS, sensor interfacing ✔️ Motor Control & Drive Systems ✔️ Signal Integrity & EMC/EMI-Conscious Design ✔️ Communication Protocols: RS232, RS485, I2C, SPI, UART, CAN ✔️ Firmware Development: Embedded C/C++ for real-time applications 🛠️ Tools & Platforms I Work With: 👉 Altium Designer – Industry-standard PCB design 👉 LTspice – Analog simulation & validation 👉 Proteus – Embedded system simulation 👉 Signal integrity tools and EMI/EMC testing preparation 🚀 Why Work With Me? ✨ Proven record of delivering on time and exceeding expectations ✨ Strong communicator who makes complex things simple ✨ Practical experience with certification-ready hardware ✨ Affordable, efficient, and results-oriented 🎯 Let’s Build Something That Works Whether you're launching a new product, troubleshooting a design, or scaling to production, I’m ready to help bring your vision to life with solid engineering and dependable execution. 👉 Check out my work: github.com/zainsiddiqui-zz 📩 Let’s connect and build your next success.

I help startups, product teams, and hardware companies 𝐝𝐞𝐬𝐢𝐠𝐧, 𝐝𝐞𝐯𝐞𝐥𝐨𝐩, 𝐚𝐧𝐝 𝐬𝐡𝐢𝐩 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐞𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐬𝐲𝐬𝐭𝐞𝐦𝐬 by combining 𝐟𝐢𝐫𝐦𝐰𝐚𝐫𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭, 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐋𝐢𝐧𝐮𝐱, 𝐈𝐨𝐓 𝐜𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐯𝐢𝐭𝐲, 𝐚𝐧𝐝 𝐫𝐞𝐚𝐥-𝐰𝐨𝐫𝐥𝐝 𝐡𝐚𝐫𝐝𝐰𝐚𝐫𝐞–𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐢𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧. With 𝟏𝟓+ years of experience in 𝐞𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐂 𝐚𝐧𝐝 𝐬𝐲𝐬𝐭𝐞𝐦 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞, I focus on 𝐫𝐞𝐥𝐢𝐚𝐛𝐥𝐞, 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧𝐚𝐛𝐥𝐞, 𝐚𝐧𝐝 𝐦𝐚𝐧𝐮𝐟𝐚𝐜𝐭𝐮𝐫𝐚𝐛𝐥𝐞 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 — not quick prototypes that break at scale. If you need 𝐄𝐒𝐏𝟑𝟐 𝐟𝐢𝐫𝐦𝐰𝐚𝐫𝐞, 𝐧𝐑𝐅𝟓𝟐/𝐧𝐑𝐅𝟓𝟐𝟖𝟒𝟎/𝐧𝐑𝐅𝟓𝟑𝟒𝟎, 𝐃𝐅𝐔, 𝐙𝐞𝐩𝐡𝐲𝐫 𝐨𝐫 𝐅𝐫𝐞𝐞𝐑𝐓𝐎𝐒 𝐬𝐲𝐬𝐭𝐞𝐦𝐬, 𝐘𝐨𝐜𝐭𝐨-𝐛𝐚𝐬𝐞𝐝 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐋𝐢𝐧𝐮𝐱 𝐜𝐮𝐬𝐭𝐨𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧, 𝐬𝐞𝐜𝐮𝐫𝐞 𝐎𝐓𝐀 𝐩𝐢𝐩𝐞𝐥𝐢𝐧𝐞𝐬, 𝐨𝐫 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐈𝐨𝐓 𝐝𝐞𝐯𝐢𝐜𝐞 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞, I deliver structured engineering from bring-up to deployment. 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨 𝐁𝐞𝐬𝐭 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐅𝐢𝐫𝐦𝐰𝐚𝐫𝐞 & 𝐌𝐢𝐜𝐫𝐨𝐜𝐨𝐧𝐭𝐫𝐨𝐥𝐥𝐞𝐫 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 • ESP32 firmware (Wi-Fi, BLE, MQTT, REST, OTA) • Nordic nRF52 / nRF52840 firmware & DFU • STM32, ARM Cortex-M, Arduino-based systems • Bare-metal, FreeRTOS, Zephyr development • Secure OTA (including production-grade FOTA systems) • Low-power design & optimization • Clean, scalable C/C++ firmware architecture 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐋𝐢𝐧𝐮𝐱 & 𝐎𝐒-𝐋𝐞𝐯𝐞𝐥 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 • Yocto-based Embedded Linux development • Linux bring-up on Raspberry Pi & custom boards • Driver integration & hardware debugging • Application-layer firmware on Linux • Production hardening & system optimization 𝐈𝐨𝐓 & 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐯𝐢𝐭𝐲 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 • AWS IoT Core, MQTT, TCP/UDP • Wi-Fi, BLE, LTE, GNSS, LoRa, CAN • Secure device-to-device communication • Gateway architecture & cloud integration • Reliable data transmission & validation 𝐇𝐚𝐫𝐝𝐰𝐚𝐫𝐞–𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 • ESP32, STM32, Nordic, u-blox, BeagleBone, Raspberry Pi • Sensor integration (IMU, environmental, GNSS, flow, etc.) • Hardware bring-up & debugging • Oscilloscope & logic analyzer-based validation • System-level architecture & scalability planning 𝗧𝗲𝘀𝘁𝗶𝗻𝗴, 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻 & 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗥𝗲𝗮𝗱𝗶𝗻𝗲𝘀𝘀 • Hardware & firmware testing • Debugging & troubleshooting • Performance optimization & reliability testing • Simulation, emulation & field-deployment validation • Production-ready handoff & documentation 𝐍𝐨𝐭𝐚𝐛𝐥𝐞 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐅𝐎𝐓𝐀 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 𝐟𝐨𝐫 𝐮-𝐛𝐥𝐨𝐱 Architected and implemented a complete firmware-over-the-air system with secure updates and version control. 𝐍𝐨𝐫𝐝𝐢𝐜 𝐁𝐋𝐄 𝐖𝐞𝐚𝐫𝐚𝐛𝐥𝐞 𝐒𝐲𝐬𝐭𝐞𝐦 (𝐧𝐑𝐅𝟓𝟐𝟖𝟒𝟎-𝐃𝐨𝐧𝐠𝐥𝐞/𝐧𝐑𝐅𝟓𝟑𝟒𝟎) Designed GATT architecture with 517-byte MTU, serial command interface, and multi-sensor communication stack. 𝐋𝐨𝐑𝐚-𝐁𝐚𝐬𝐞𝐝 𝐒𝐦𝐚𝐫𝐭 𝐃𝐨𝐨𝐫 𝐋𝐨𝐜𝐤 (𝟐𝟎𝟎+ 𝐔𝐧𝐢𝐭𝐬) Built secure unlock feedback system with device-to-device communication and structured unit validation logic. 𝐒𝐦𝐚𝐫𝐭 𝐀𝐪𝐮𝐚𝐫𝐢𝐮𝐦 & 𝐏𝐥𝐚𝐧𝐭 𝐌𝐨𝐧𝐢𝐭𝐨𝐫𝐢𝐧𝐠 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 Designed real-time environmental monitoring systems integrating sensors, pumps, and actuators with embedded control logic. 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 Firmware: C, C++, Embedded C, FreeRTOS, Zephyr, ESP-IDF, Nordic SDK, Arduino Embedded Linux: Yocto, Buildroot, OpenWrt Hardware Platforms: ESP32, STM32, nRF52, nRF53, ARM Cortex-M, Raspberry Pi, u-blox Connectivity: Wi-Fi, BLE, LTE, GNSS, LoRa, CAN, MQTT, REST, MODBUS Cloud & IoT: AWS IoT Core Tools: Git, CI/CD pipelines, Keil, PlatformIO, Oscilloscopes, Logic Analyzers 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 End-to-end embedded expertise (firmware to deployment) Strong OTA and connectivity background Production-focused engineering mindset Clean, maintainable code architecture System-level debugging capability Experience supporting hardware bring-up and manufacturing transition Long-term collaboration & NDA-friendly 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Embedded Systems, Firmware Development, ESP32, nRF52840, nRF5340, Zephyr, FreeRTOS, Embedded Linux, Yocto, IoT, OTA, FOTA, ARM Cortex-M, MQTT, LoRa, BLE, AWS IoT, Modbus, Sunspec, Hardware Software Integration, Low Power Design, Production Firmware 𝗛𝗮𝘀𝗵𝘁𝗮𝗴𝘀 #EmbeddedSystems #FirmwareDevelopment #ESP32 #IoT #EmbeddedLinux #Microcontrollers #RTOS #FreeRTOS #HardwareEngineering #FOTA #OTA #IOT #MODBUS #SunSpec #LowPowerDesign #ProductionReady #IoTGateway If you need an 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 and 𝐈𝐨𝐓 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 with deep expertise in firmware, hardware design, manufacturing processes, and real-world deployment, I’m ready to collaborate.

Hello. If we agree to go ahead with bringing your idea to life, you can be sure that: 💼 The design documentation will be well-structured and tidy. 🎯 The schematic design and PCB layout will be done properly to pass the EMC. 💵 The design will be cost-effective by thoroughly selecting the components and not paying for something the project doesn't need. 🚀 The firmware in C will be designed to be predictable and reliable. 🏭The project will be designed with mass-manufacturability in mind. 🔩The prototype will be assembled and tested in-house using professional equipment. 🎮If required, some of the mechanical parts of your project can be designed using Fusion 360. ● I approach hardware and software design, focusing on reliability and performance in real-world conditions, not just on the desk. Leveraging my expertise as an electronics engineer, I ensure that all my designs pass EMC/EMI requirements. My work is built to withstand the demands of field deployment. Hi! Thank you for visiting my profile. I'm an Electronics Engineer with 8+ years of professional full-time experience and 14 years of hands-on hobbyist experience. My passion for electronics started when I was a kid, and it has driven me to develop an expertise in the hardware and software aspects of electronics engineering. ● My main specialisations are: Power electronics, Audio on low-cost devices, Battery-powered devices. ● I'm experienced with the following: Firmware design in C for ESP32, STM32, CH32V, 8051 MCU's Mixed-signal multi-layer PCBs. BOM optimisation. DC/DC Wi-Fi LoRa SPI, I2S, I2C, UART, CAN User interfaces using the LVGL graphics library RaspberryPi ● Software I use: KiCad for schematic capture and PCB layout(I've used Altium in the past). VSCode and CubeIDE for firmware. LTSpice for simulations. Autodesk Fusion 360 as MCAD. A bunch of other specialised software for calculations and simulations. Let's work together to bring your ideas to life.

Prototype production. Embedded systems hardware and software design and development. Recent projects: - GPS Tracker. - Smart streetlight. - Precise control of instrumentation using PTP. - Bicycle gear autochanger. - Solar-powered (battery less) electronic-ink display. Recent Microcontrollers: - IMXRT1062 - ESP32 - ESP8266 - CC2642R - STM32F4 - PIC16F84 - RP2040 Software skills: - C/C++, Swift, Linux shell scripting using bash. - Development environments: MCUExpresso, STM32CubeIDE, VSCode, Arduino, Xcode. Hardware skills: - Electronic circuit design based around microcontrollers. - PCB design. - Enclosure design (3D printing). Other: - Understanding of WiFi, LoRa and Bluetooth low energy communications. - E-ink displays. - Design of battery powered systems. - Low power encryption techniques. Detailed portfolio: GitHub user: zac-taylor-demo Includes articles on embedded systems, articles on electronics and example C/C++ code.