# Arjan Wooning

> Senior embedded engineer with 35+ years of experience bridging hardware, industrial protocols and modern software. Based in Vraclávek, Czech Republic. Available for freelance and contract work.

Arjan Wooning designs and builds reliable systems across the full stack: Python & C on Linux, IoT and energy systems (inverters, batteries, LoRa sensors), industrial messaging (MQTT, Modbus RTU, REST), and embedded firmware (Zephyr, Nordic, BLE). He has worked in defence, telecom, marine navigation, and clean energy.

Career arc: product designer at Adesys (1989-1997), software engineer at Thales Defence (1997-2000), system analyst at KPN (2000-2003), software architect at Imtech Marine & Offshore (2003-2011), Owner / Software Developer / Linux Systems Engineer - Self-employed (2006-2022), senior software developer at Tietoevry (2023-2025), Senior Backend & Embedded Software Engineer - Self-employed (2025-present).

## Pages

- [NL: Profiel](https://arjan.wooning.cz/nl/): Nederlandstalige homepage met expertise, ervaring en projecten
- [EN: Profile](https://arjan.wooning.cz/en/): English homepage with expertise, experience and projects
- [NL: Over](https://arjan.wooning.cz/nl/about/): Achtergrond, expertise en beschikbaarheid
- [EN: About](https://arjan.wooning.cz/en/about/): Background, expertise and availability
- [NL: Projecten](https://arjan.wooning.cz/nl/projects/): Overzicht van technische projecten
- [EN: Projects](https://arjan.wooning.cz/en/projects/): Overview of technical projects
- [NL: Blog](https://arjan.wooning.cz/nl/blog/): Technische artikelen over embedded systemen, Linux en IoT
- [EN: Blog](https://arjan.wooning.cz/en/blog/): Technical articles on embedded systems, Linux and IoT
- [NL: Archief](https://arjan.wooning.cz/nl/archive/): Oudere technische artikelen en migratiecontent
- [EN: Archive](https://arjan.wooning.cz/en/archive/): Older technical articles and migrated content
- [NL: Contact](https://arjan.wooning.cz/nl/contact/): Contactopties voor freelance en contractwerk
- [EN: Contact](https://arjan.wooning.cz/en/contact/): Contact options for freelance and contract work
- [NL: Privacy](https://arjan.wooning.cz/nl/privacy/): Privacyverklaring
- [EN: Privacy](https://arjan.wooning.cz/en/privacy/): Privacy policy
- [Search](https://arjan.wooning.cz/nl/search/): Search page for site content

## Projects

- [Smart Home EMS](https://arjan.wooning.cz/en/projects/energy-management-system/): Python-based energy management system integrating PV, battery, heat pump, car charger and pool, with phase balancing and real-time optimisation via Home Assistant
- [Inverter Abstraction Layer](https://arjan.wooning.cz/en/projects/inverter-abstraction-layer/): Multi-brand solar inverter connectivity via Modbus RTU running in Docker on SunBerry, with MQTT for inter-process communication
- [Secure HawkBit OTA](https://arjan.wooning.cz/en/projects/hawkbit-iot-ota-updates/): End-to-end OTA update system for IoT devices using Eclipse HawkBit, with fleet simulation and error injection
- [Home Automation System](https://arjan.wooning.cz/en/projects/home-automation-system/): Home Assistant + HomeLogic event-driven engine with RFLink, Zigbee, LoRa, Tesla integration, security modes, and Telegram notifications
- [Universal LoRa Sensor](https://arjan.wooning.cz/en/projects/universal-low-power-lora-sensor/): Custom ATmega328P + RFM95W board with 5.3 µA deep sleep — 3+ years on one battery
- [3D Modeling Projects](https://arjan.wooning.cz/en/projects/3d-modeling-projects/): Practical SketchUp models focused on real-world dimensions, construction feasibility and fabrication

## Contact

Arjan Wooning — https://arjan.wooning.cz
LinkedIn: https://www.linkedin.com/in/arjanwooning