Hire the Best Embedded Systems Engineers
in Poland

Senior Software Engineer and Systems Architect with 15+ years of hands-on experience in commercial development. My core expertise spans native software, microcontroller firmware, and electronic hardware. For the past 10 years, I have been helping my Upwork clients create new products from scratch and implement new features in existing software and hardware products. ■ Embedded Systems and Firmware ▪ Core experience: - Complex business logic & advanced control algorithms - Distributed control systems, machine networking (M2M) - High-performance / low-latency control - Secure, reliable, real-time interprocess communication (IPC) • Typical stack: - C, C++ (C++11/17), STL (except that needs heap memory allocation) - IAR for ARM, Keil + ARM/Clang, GCC for ARM, STM32Cube Tools - ThreadX RTOS (preferred), FreeRTOS, mbed, mbedTLS - No HAL from STM32 in production firmware ■ Native Desktop Applications and C++ Backend Software • Specialization: - High-performance GUI applications based on the Qt Framework (QtWidgets) - Console applications (CLI - command-line interface) - Standalone applications (no GUI or command-line interface) - Windows services and system applications - Any of the above combined into a complex via interprocess communication (IPC) • Typical stack: - C++11/23, STL, Qt6, Boost, ICU, rich own codebase - Microsoft Visual Studio, Microsoft Visual Studio Code - SQL DBMS: Oracle, Postgres, SQLite, MySQL, MS-SQL ● Other - Strong focus on design quality, reliability, and maintainability - Recent domains: IoT, AgTech, Automotive, Manufacturing, Defense, Energy - Recent tech: LoRa, GSM, LTE, LTE-M, Ethernet, RS-485, Modbus, CAN, CAN FD - Recent STM32 MCUs: STM32H7 (single/dual-core), STM32F4, STM32L4, STM32G4 Keywords: C++ C Multithreading IPC Qt Framework Socket IP TCP UDP PPP SSL TLS PLC SCADA MCU Microcontroler STM32 RTOS FreeRTOS ThreadX AVR UART USART CAN LIN Modbus Ethernet SPI I2C DMA RS-232 RS-485 DMA Sensor 12V 24V 48V 5V 3V 3V3 Drone FPV UAV UGV ESC Ardupilot Betaflight Pixhawk PX4 LRS ELRS S.BUS SBUS CRSF Crossfire Radio GSM SMS LTE LTE-M GPS GNSS LoRa Serial Port FTDI FT232 OGG OPUS Vorbis Speex WAV WinAPI WinSock mbed mbedtls Serialization AES DES 3DES GOST RFID BLDC WinUSB USB USBX CDC HID DSP NetX CycloneTCP

I am firmware developer with over 8 years experience. I was working for one the biggest provider of BLE chips - Nordic Semiconductor - creating SDK, writing drivers, examples, tests and documentation. I was also part of team creating BLE MESH stack for nrf platform. I specialize in creating embedded systems (eg asset tracking) as well as standalone device (toys, gadgets) including embedded device firmware and mobile app software connected over BLE. Working experience: - worked for 2 years for Nordic Semiconductor (famous nrf51 and nrf52 series) creating BLE based firmware - worked for Silvair - company which created first certified BLE MESH stack I completed many projects: - child toy with ble, mic, speaker, i2c touch sensor, led - e-ciggarette with ble, led, complex algorithms, unit tests, system tests - line-follower with ble, motor control, PID algorithm - indoor tracking system including beacons, scanners and relays - nrf52 based device with accelerometer, getting data from it and sending it to mobile over BLE with mobile app plotting data in real time - nrf52 based device to commmunicate with external device getting data over i2c and sending it to mobile over BLE / working on mobile app - nrf52 based home automotion device with bulbs connected, controlled over BLE by mobile app written by me #ARM Cortex-M #AVR #BLE #C #C++ #Android #python

I help businesses, startups and founders design and build complete software systems, from embedded devices and IoT solutions to backend services, web platforms, desktop applications and mobile apps. Every project starts with understanding your business goals. Based on your requirements, I help select the right architecture and technology stack to build solutions that are reliable, maintainable and ready to grow. I can help with: Software architecture and technical consulting Embedded firmware and IoT systems Backend, web, desktop and mobile applications Hardware and software integration Legacy system modernization and technology migration Monitoring, diagnostics and long-term technical support Documentation and knowledge transfer for your team If you're looking for a software engineer who can take ownership of a project from architecture and implementation to deployment and ongoing support, I'd be happy to discuss your ideas.

I'm Mieszko Mieruński, I have 13+ years of experience with Embedded Systems My main specialization is Zephyr RTOS, which I work with since 2018, when I was working at Nordic Semiconductor writing drivers for nRF91 and nRF53 chips. I have vast experience with nRF chips and tackle hardest issues with RF, connectivity and power optimization. I also have experience working with other technologies listed below: 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 & 𝗣𝗿𝗼𝘁𝗼𝗰𝗼𝗹𝘀 • Connectivity: LTE-M, NB-IoT, LoRaWAN, Bluetooth / BLE, Wi-Fi (including HaLow), Thread • Application Protocols: Matter, MQTT, LwM2M, CoAP • Integrated Systems: GPS/GNSS, Asset Tracking, Sensor Fusion 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀 & 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 • Zephyr RTOS (Official Ecosystem Vendor & Technical Contributor) • FreeRTOS • Embedded C/C++ • Rust (for memory-safe, mission-critical systems) 𝗠𝗖𝗨 𝗙𝗮𝗺𝗶𝗹𝗶𝗲𝘀 • Nordic Semiconductor (nRF52, nRF54, nRF91 series) • Espressif (ESP32, ESP32-S3, ESP32-P4) • STMicroelectronics (STM32H7 and others) 𝗩𝗲𝗿𝘁𝗶𝗰𝗮𝗹 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻𝘀 • Industrial IoT (IIoT) & Factory Automation • Smart Agriculture • Connected Healthcare & MedTech • Smart Home & Building Automation • Emergency & Safety Devices • Asset Tracking & Logistics

Solo software engineer based in Poland. I build the whole path from the device to the browser: firmware on the board, the backend that stores what it sends, and the app the operator actually uses. I flew commercially from 2011 to 2019. I started programming a year before I left the cockpit and went full time from 2019: freelance Flutter, then a software engineering role, then my own product, which is what I build now. Eight years in aviation is why I write things down, work to a procedure, and think about how a system fails before I think about how it works. Backends. FastAPI modular monoliths on Python 3.14, SQLAlchemy 2.0 async with asyncpg, Alembic migrations, Pydantic settings, pytest and mypy. Before FastAPI I shipped production systems on Quart, including a multi-tenant management platform (Quart, PostgreSQL, Flutter Web, a pile of third-party API integrations) that I built solo end to end. I maintain my own reusable Quart foundation package. Industrial and IoT integration. The platform I run now drives a factory floor. MQTT between the backend and gateway devices, RS-232 bridging to grading machines and label printers, ZPL label generation, hardware simulators so the system can be tested without the machines present, and a full audit trail. It syncs with a third-party ERP over SQL Server. Separate domains for production management and orchestration, supply/product/packaging warehouses, sales, print service, ERP comms and machine comms. Multi-environment Docker Compose, Loki and fluent-bit for logs. Firmware. ESP-IDF in C for the gateway that bridges MQTT and the machines: Ethernet/RMII bring-up, DHCP or static config, SNTP, MQTT with per-device topic namespaces and presence/heartbeat, OTA with rollback validation, NVS persistence, an on-device HTTP settings page, partition and version management. Also writing bare-metal Rust for the ESP32-P4. Mobile development. Flutter since 2020, mobile and web from one codebase: auto_route, get_it/injectable, freezed, dio, flutter_bloc, fpdart. Dense operational UI with Syncfusion data grids, charts and in-app PDF viewing, plus websockets for live device management and secure credential storage. Native Android in Kotlin with modular Gradle and a build-logic plugin, for handheld barcode data collectors used on the warehouse floor, and a Java plugin wrapping the scanner hardware SDK. iOS work goes back to Swift and UIKit in 2019. Web development. TypeScript dashboards against my own APIs, and Astro marketing sites. Comfortable owning the API contract on both sides of it. Infrastructure. Docker and Compose throughout. I self-host my own stack on Debian: Caddy with wildcard certificates over DNS-01, PostgreSQL, Pi-hole and unbound with split-horizon DNS, WireGuard, Asterisk. Linux, systemd and networking are day-to-day, not occasional. Most of my substantial work sits in private product repositories, so I can walk you through the architecture and the decisions on a call rather than hand you a link. For scale: the platform I run now is past a thousand commits on the backend alone, built and maintained solo alongside its Flutter frontend, Kotlin data collectors, ESP-IDF gateway firmware and TypeScript dashboard. If your project involves hardware, a messy third-party integration, or something that has to keep running unattended, that is the part I am worth paying for.

Electronic engineer who designs with passion. Works with the customer to find the right solutions. On a daily basis, he develops his own small IoT company — Moisen.eu. Experience in designing and programming embedded systems. Strong focus on IoT solutions.