🚀 Embedded Software Engineer | IoT Systems Specialist | Firmware Optimisation Expert 💼 PROFESSIONAL OVERVIEW Embedded Software Engineer with 4+ years developing robust firmware and IoT solutions for international clients. Currently delivering remote embedded systems support with proven track record in performance-critical applications. Specialising in performance-critical C/C++ firmware, real-time systems, and end-to-end IoT implementations from prototype to production deployment. ⚡ CORE EXPERTISE 🔧 Embedded Firmware: C/C++, real-time systems, microcontroller programming (ESP32, STM32, ARM Cortex-M) 🌐 IoT Architecture: MQTT, LoRaWAN, cloud integration, wireless protocols, edge computing solutions 📱 Mobile App Development: Custom IoT mobile applications with real-time cloud data integration, intuitive dashboard design, and seamless MCU-to-mobile communication pipelines 📊 Desktop & Web Solutions: Cross-platform desktop applications, web-based monitoring dashboards, and comprehensive data visualization systems for IoT deployments 🔍 Remote Diagnostics: Global system support, OTA updates, real-time troubleshooting 💻 TECHNICAL STACK Languages: C/C++, Python, JavaScript, TypeScript Platforms: ESP32, STM32, Raspberry Pi, Arduino RTOS: FreeRTOS, Zephyr, Embedded Linux Protocols: MQTT, LoRaWAN, I2C, SPI, UART, CAN, BLE, WiFi, Zigbee Cloud: AWS IoT, Firebase, ThingSpeak, custom backends, Azure IoT Hub Mobile: React Native, Flutter, native iOS/Android Testing & CI/CD: Unit testing frameworks, HIL (Hardware-in-the-Loop) testing, CI/CD pipelines for embedded systems, automated testing workflows 🎯 FEATURED PROJECTS Smart Environmental Monitoring: ESP32-based sensor networks with cloud analytics, deployed across multiple facilities with real-time mobile dashboards Thermal Management Solutions: Complete IoT cooling systems with mobile app integration and predictive maintenance algorithms Home Automation Platforms: MQTT-based smart home systems with voice control and scheduling capabilities Industrial LoRaWAN Networks: Long-range sensor deployments with custom gateway solutions and web-based monitoring 🗣️ LANGUAGES English: Fluent (Technical & Business) Turkish: Native ✅ SERVICE OFFERINGS 🚀 Firmware Development: Custom embedded software solutions 🔧 System Architecture: Scalable IoT platform design 📱 Mobile Integration: Cross-platform application development with real-time data visualization 📊 Dashboard Development: Web and desktop monitoring solutions 🛡️ Performance Optimisation: Code analysis and enhancement 📞 Remote Support: Global troubleshooting and maintenance 📚 Technical Documentation: Comprehensive system documentation 🔧 CI/CD Implementation: Automated testing pipelines, unit testing, and HIL testing for embedded systems 📋 PROJECT MANAGEMENT & DOCUMENTATION I provide a complete documentation package with all projects including: Source code with comprehensive comments Design files and schematics Version control setup (Git, GitHub, GitLab based on client preference) Change tracking from project inception Future development reference materials Ongoing support for your development team Project Management Tools: Jira, Trello, ClickUp, Monday.com Collaboration Tools: Confluence, Slack, Microsoft Teams Version Control: Git, GitHub, GitLab, Bitbucket ⏱️ WORKING STANDARDS Response Time: Within 2 hours Availability: EU/UK business hours + flexible scheduling Communication: Regular updates, video calls, detailed reporting Quality: Unit testing, code reviews, comprehensive validation Delivery: Production-ready solutions with full documentation

I help companies debug, stabilize, and ship embedded products on STM32, ESP32, nRF52, EFR32, NXP KL17, JieLi, HDSC, and other ARM / RISC-V platforms. Typical problems I solve: • STM32 hard faults, crashes, boot issues • Custom board bring-up and peripheral integration • BLE / LoRa / MQTT connectivity issues • RS485 / Modbus communication instability • Low-power optimization for battery-operated devices • OTA reliability issues • Porting firmware to new boards, MCUs, or RTOS platforms • Turning prototypes into production-ready firmware I have 15+ years of embedded development experience across industrial communication systems, low-power IoT devices, wireless products, and mass-production consumer electronics. My background includes product lines with more than 10M devices shipped. Core platforms and technologies: • STM32 / ESP32 / nRF52 / EFR32/ NXP KL17 / JieLi • FreeRTOS / Zephyr / Arduino / PlatformIO • BLE / LoRa / NB-IoT / 4G / Cat.1 • RS485 / Modbus / UART / SPI / I2C • AWS IoT / MQTT / OTA • Battery-powered and ultra-low-power systems Selected experience: • STM32H7 controller platform with dual-core architecture, LVGL UI, RS485 communication, and ESP32-S3 connectivity co-processor • Ultra-low-power fault indicator for utility networks with multi-year battery life and LoRa communication • BLE thermal printer platform focused on wireless stability, motor control, print control, and production reliability Why clients work with me: • Strong debugging and root-cause analysis • Real production and manufacturing support experience • System-level architecture thinking • Clear communication and practical decisions • Reliable long-term collaboration Available for: • Firmware debugging and stabilization • Custom board bring-up • New feature development • RTOS-based firmware architecture • Wireless and industrial communication projects • Long-term embedded support Based in China (UTC+8), with flexible overlap for US / EU / AU teams. Typical response time: within 4 hours. Currently available for new debugging, bring-up, and embedded firmware support projects.

Relentless, persistent, and passionate. I am skilled in circuit and pcb design, programming embedded and MCUs coming with the territory. I conceptualize solutions to maneuver out of tricky situations. I am a fast learner, able to learn on the fly. I strive for optimization, and never settle. Your product's success is my priority, disappointment is not on the table.

Greetings! I'm Don Collins, an Electronics Engineer with a broad range of expertise, including low-level technologies, transmission protocols, IoT development, and familiarity with various System-on-Chip (SoC) platforms. If you require assistance with projects involving different SoCs, you've come to the right place. I have hands-on experience working with a variety of SoCs, enabling me to tailor solutions to your specific requirements. Some of the SoCs I am familiar with include: - ARM Cortex Chips: I possess knowledge and expertise in programming ARM Cortex-based microcontrollers and processors. Whether you're working with Cortex-M0, Cortex-M3, Cortex-M4, or other variants, I can help you leverage the full potential of these powerful chips. - 8-bit PIC chips: With experience in programming 8-bit PIC microcontrollers, I can assist you in developing efficient and optimized solutions using the powerful and versatile PIC architecture. I am well-versed in utilizing tools like mikroC to program these chips. - Nordic NRF chips: Nordic Semiconductor's NRF series offers a range of versatile and feature-rich SoCs. I have familiarity with programming NRF chips, enabling seamless integration of these chips into your projects, whether it's for wireless communication, IoT applications, or other functionalities. - ESP32s and ESP8266: These popular SoCs from Espressif Systems are widely used for IoT applications and Wi-Fi-enabled devices. I am proficient in programming both ESP32 and ESP8266 chips, allowing me to create robust and reliable solutions for your IoT projects. My familiarity with these SoCs extends beyond basic programming. I understand their capabilities, hardware integration nuances, and how to optimize their performance for your specific requirements. I am passionate about delivering high-quality results and staying up-to-date with the latest advancements in technology. With my knowledge of SoCs, low-level programming, transmission protocols, and IoT development, I am well-equipped to tackle your most challenging projects. If you're seeking an experienced professional who can leverage the capabilities of various SoCs to bring your ideas to life, look no further. Let's collaborate and create innovative solutions using the power of these advanced chips. Feel free to reach out, and together we can achieve remarkable outcomes.

I’m Steven Calinski, an Embedded Systems & Firmware Engineer with a passion for solving problems using software or hardware designs. I have a strong background in electrical testing as well as embedded firmware development. I’ve worked on critical embedded projects for fire alarm systems, mobile computing hardware, RF designs, and IoT applications, handling everything from firmware development to EMI mitigation, component level debugging, production testing, schematic design, and board layouts. Languages: C, C++, C#, Python, VHDL RTOS: FreeRTOS, Zephyr RTOS MCU Experience: STM32: F7, H7, H5, H4, Atmel SAM E, Renesas RA, TI MSP430, Silicon Labs, ESP32, ESP32-S3 Firmware Debugging & Optimization: USB, I2C, UART, SPI, PWM, DMA, MQTT, Cellular Network, Current limiting, Power, Battery backup switching, driver creation. I have a background in electrical test engineering as well and am comfortable with hardware troubleshooting, rework, repair, etc. I have a basic rework setup in my home. I am very familiar using Saleae logic analyzer, and oscilloscope to address signal integrity issues. Automated Test Development: LabVIEW applications for engineering & regulatory testing, ESP32 IOT projects for test automation. PCB Schematic Capture & Layout: Cadence Allegro, KiCad, Eagle Board Bring-Up & Component-Level Debugging: Rapid prototyping and validation Microcontroller & RF Circuit Design: Sub-1GHz RF design, BLE integration Click "Invite to Job" or "Hire Me", and let me help you develop your next project.

AI-Driven Test Automation | LabVIEW | C# (WPF) | Python | Industrial AI | Digital Transformation With over 8 years of experience, I specialize in designing next-generation AI-enabled test automation, industrial software, and intelligent data acquisition systems for manufacturing, automotive, aerospace, defense, energy, telecom, and research organizations. In today’s AI era, automation is no longer limited to controlling hardware—it is about creating intelligent systems that can acquire data, analyze results, detect anomalies, optimize processes, and support faster engineering decisions. My expertise combines LabVIEW, C# (WPF), Python, Industrial Communication Protocols, and AI technologies to develop scalable, high-performance software that seamlessly integrates hardware, enterprise systems, and modern AI capabilities. I have successfully delivered solutions ranging from automated test equipment (ATE), production testing, process automation, SCADA systems, and custom measurement platforms to intelligent analytics dashboards, predictive monitoring, and AI-assisted engineering applications. Core Expertise AI-Driven Engineering * AI-assisted Test Automation * Intelligent Data Analysis & Visualization * Predictive Analytics & Anomaly Detection * Machine Learning Integration * AI-assisted Software Development * Digital Twin & Smart Manufacturing Concepts * Automated Report Generation * Engineering Copilots & Workflow Automation Software Architecture * Actor Framework * DQMH * JKI State Machine * Producer–Consumer Architecture * Event-Driven Programming * Object-Oriented Design (OOP) * Multithreaded Application Design * Modular & Scalable Software Architecture LabVIEW Development * LabVIEW 2014–2026 * Real-Time (RT) * FPGA * NI-DAQmx * VISA * Advanced UI/UX Development * Custom Drivers * High-Speed Data Acquisition * Industrial Test Executive Development * Legacy Application Modernization C# & Python Development C# (WPF) * MVVM Architecture * Hardware Integration * High-Performance GUI Development * Multithreading * Dashboard Applications * REST APIs Python * PyQt * Data Analytics * AI & Machine Learning Libraries * REST APIs * Socket Programming * OPC UA * PyModbus * Data Processing & Visualization Industrial Communication & Hardware Integration NI Hardware * PXI * CompactRIO * CompactDAQ * FPGA * VISA * DAQ Devices Industrial Protocols * OPC UA * OPC DA * Modbus TCP/RTU * CAN * UART * TCP/IP * USB * GPIB * EtherNet/IP * Fieldbus Instrumentation * Yokogawa GM10 * Oscilloscopes * Electronic Loads * Power Meters * Fluke Instruments * Spectrum Analyzers * PID Controllers * Machine Vision Systems * Sensors & DAQ Equipment Enterprise Integration * SQL Server * MySQL * Oracle * MS Access * SAP Integration * ERP Connectivity * MES Integration * CSV * Excel * TDMS * XML * PDF * Word Reporting * Cloud APIs Industry Experience * Automotive & Electric Vehicles * Aerospace & Defense * Industrial Manufacturing * Semiconductor & Electronics * PCB Functional Testing * Railway Systems * Energy & Utilities * Oil & Gas * Chemical Plants * Scientific Research * Telecommunications * Medical & Laboratory Automation What I Build * AI-Enabled Automated Test Equipment (ATE) * Production Test Systems * End-of-Line (EOL) Testing * Hardware-in-the-Loop (HIL) Systems * Data Acquisition Platforms * SCADA & Industrial Monitoring * OPC UA-Based Industrial Applications * Industrial Dashboards * Digital Traceability Systems * Predictive Maintenance Platforms * Machine Vision Inspection Systems * IoT & Edge Computing Solutions * Custom Engineering Software * Legacy Software Modernization Technical Skills AI & Modern Technologies AI-Assisted Engineering • Machine Learning • Data Analytics • Predictive Analytics • Digital Twin • Intelligent Automation • Engineering Copilots • Industrial AI Software LabVIEW • C# • WPF • Python • .NET • REST APIs • Git • Azure DevOps Industrial DAQ • FPGA • RT • OPC UA • Modbus • CAN • PLC • SCADA • HMI • PXI • CompactRIO • Test Automation • Embedded Integration Database SQL Server • MySQL • Oracle • SQLite • MS Access Reporting Excel • TDMS • CSV • XML • Word • PDF • Automated Report Generation ⸻ Why Clients Work With Me I focus on delivering software that is intelligent, scalable, maintainable, and future-ready. By combining traditional automation expertise with AI-powered engineering workflows, I help organizations reduce development time, improve testing accuracy, enhance traceability, and accelerate innovation. Whether developing a new automation platform, modernizing legacy LabVIEW applications, integrating enterprise systems, or building AI-enabled industrial solutions, my goal is to create reliable software that delivers measurable business value.

I am an electronics and firmware developer with experience in PCB design, firmware development, prototyping and SMD assembly. My journey started with hand crafting single sided PCBs — giving me a strong practical foundation from the ground up. PCB Design: 2 and 4 layer PCB design in KiCad 8,Kicad 9(Soon migrating to Kicad 10) & EasyEDA(Standard & Pro version) . Former EagleCAD user Schematic to manufacturing ready layout Custom footprint creation Gerber, drill, pick and place and BOM files Full submission support for JLCPCB(PCB & PCBA) and similar manufacturers Assembly & Prototyping: SMD soldering — 1206-0402 passives, QFN, TSSOP (except BGA) Through hole soldering Small batch prototype assembly Component procurement support Firmware & Connectivity: Microcontrollers — ESP32, ESP8266, Arduino, AVR, 8051 Cellular — Quectel EC25 & SIMCom SIM7672 with MQTT SSL/TLS Wireless — LoRa, WiFi, Bluetooth, GSM GPS — Ublox & Quectel module integration Displays — OLED, TFT, capacitive touch Protocols — I2C, SPI, UART, MQTT SSL/TLS, HTTP REST Motor drivers, WS2812 LED arrays, power circuits GPS- Quectel L89, Ublox M10S Special - WS2812 Led Projects include: GPS trackers, GSM security systems, water level controllers, , line followers, obstacle detection robots, WS2812 LED arrays and various ESP32 and Arduino IoT devices. I am a full time freelancer committed to clear communication and timely delivery — working with hobbyists, startups and commercial clients alike. Feel free to reach out!

Hello, I’m an Embedded Firmware & Hardware Engineer with solid experience in developing IoT, automation, and wireless systems. I specialize in low-level firmware design, communication protocol integration, and user interface development, combined with practical hardware design and testing. My goal is to deliver robust, efficient, and production-ready solutions tailored to your needs. 🔧 Key Experience ► Embedded firmware design: Bare-metal & RTOS (C/C++) ► Board bring-up, debugging & validation ► Hardware schematic & PCB design (analog, digital, mixed-signal) ► Parts selection, BoM creation & manufacturing file preparation ► Power supply design: DC-DC (buck/boost), linear regulators ► Documentation & source code management 🛠 Microcontrollers & Platforms ► STM32 (Cortex-M0+/M3/M4/M7) ► ESP32, ESP8266 ► nRF52 series ► Holtek, PY32, MG82F6D17 ► Arduino, Raspberry Pi 🔗 Interface Protocols ► UART, SPI, I2C, RS485 ► QUADSPI, ADC, DAC ► USB 2.0, USB 3.0 📡 Wireless & Communication ► Wi-Fi, BLE (Bluetooth Low Energy) ► Ethernet, 4G/LTE ► LoRa, LoRa Mesh, LoRaWAN ► NFC, RF Modules, Power Amplifiers 📺 Displays & Modules ► UI development with LVGL on TFT Touchscreens ► LCD, OLED Displays ► Sensor integration (temperature, GPS, ultrasonic, laser) ⚡ Hardware & PCB Design ► Multi-layer PCB design (1–6 layers) ► Impedance-controlled routing, high-speed interfaces ► Mixed-signal circuit design (ADC/DAC, filters, amplifiers) ► Motor control: BLDC, Stepper, Servo, DC ► RF & antenna design basics 🏆 What I Deliver ✔️ Reliable embedded firmware (C/C++) with efficient drivers & protocols ✔️ Robust, manufacturable hardware designs ✔️ End-to-end IoT & embedded solutions (from prototype to production) 🤝 Let’s work together to turn your embedded system ideas into scalable, reliable products.

PCB Design Engineer (PCB Designer) and Electronics Technical Writer with 6+ years of experience helping PCB companies and IoT startups build reliable hardware and helping electronics brands publish technical content that ranks on Google and earns trust from engineers. On the writing side, I currently write ongoing electrical and electronics blog content for 4 long-term clients, covering PCB design, embedded systems, and IoT topics. On the engineering side, I design production-ready circuit boards in Altium Designer, KiCad, and EasyEDA, paired with embedded firmware development in C/C++ for ESP32, ESP8266, STM32, Arduino, AVR, and PIC. I write from real hands-on design experience — not surface-level research — which is why technical readers and editors keep coming back. ELECTRONICS TECHNICAL WRITING ✅ Ongoing electrical and electronics blog writing (currently retained by 4 long-term clients) ✅ PCB design, manufacturing, and troubleshooting articles ✅ Altium Designer tutorials and feature deep-dives ✅ ESP32 / ESP8266 programming guides and project walkthroughs ✅ Embedded systems and IoT documentation, application notes, and how-to guides ✅ SEO-optimized technical content for electronics companies and engineering blogs PCB DESIGN & HARDWARE ENGINEERING ✅ PCB design and layout — single to multilayer, Altium Designer / KiCad / Eagle / EasyEDA / OrCAD ✅ Circuit design, schematic capture, and simulation ✅ Embedded firmware development — Arduino, ESP32, ESP8266, STM32, AVR, PIC, nRF52 ✅ IoT hardware — Wi-Fi, Bluetooth/BLE, LoRa, GSM/4G, RFID ✅ Sensor boards, motor controllers (BLDC/DC), power supplies, automation and robotics hardware ✅ Design for manufacturability (DFM) and PCB manufacturing support ✅ Hardware prototyping, bring-up, and debugging WHAT YOU RECEIVE ✅ Well-researched, plagiarism-free technical articles delivered on schedule ✅ Production-ready schematics, PCB Gerber files, and assembly documentation ✅ Clean, documented firmware source code ✅ Support through bring-up, debugging, and revisions ✅ Clear, responsive communication throughout Tell me what you're building or publishing, and I'll recommend the fastest path — from concept to production, or from idea to published, engineer-trusted content.

I graduated from an accredited university with a bachelor's degree in electrical engineering with a GPA of 3.65. Since that point I now have over 10 years experience in various fields of engineering ranging from electric drives to security systems. My primary focus has been with embedded systems and PCB design. I have used numerous controllers in past designs however the most popular with my clients has been the arduino and various versions of it. Also the teensy has been a popular choice lately. I use Eagle Cad to design PCB's and can design up to four layers although two layers will suffice for most projects. I also have have experience with various IOT modules such as the laird bl652, esp8266, and the particle. If you have any questions please contact me.