About Me

Tech Lead and IoT Engineer with hands-on experience in industrial monitoring systems, edge-to-cloud integration, and automation. Skilled in Python, embedded firmware, and AWS development — focused on creating reliable, observable, and maintainable systems from device to cloud.

Work With Me See References

Marko Štumberger

IoT Systems Engineer • Tech Lead • Automation Specialist

Computer engineering graduate with expertise in embedded systems, automation, IoT, and cloud infrastructure. I design and develop reliable end-to-end solutions — from sensors and firmware to cloud dashboards and APIs — with a focus on reliability, usability, and remote monitoring.

Maribor, Slovenia [email protected] +386 70 853 382 Website

Highlights

Led IoT surge monitoring system (Project RAM) improving diagnostic accuracy and testing efficiency.
Developed Python SDK & REST client accelerating integration testing workflows.
Built Raspberry Pi 5 Honey Dispenser — full automation with touchscreen GUI and stepper control.
Specialized in observability, system reliability, and embedded-to-cloud architecture.

Key Projects

Test Control Unit (TCU) — Custom testing system built on Raspberry Pi 5 with touchscreen for ICT and functional testing of IoT devices. Integrated STM32 microcontroller for signal triggering and validation, OpenOCD for firmware flashing, Zephyr Shell for automated test execution, and Bluetooth/UART for final device verification.
Raspberry Pi 5
STM32
Zephyr
OpenOCD
Automation
Testing
Smart Honey Dispenser (Raspberry Pi 5) — Automatic honey dispensing system featuring a high-accuracy load cell (HX711), stepper motor control, and touchscreen GUI. Designed for beekeepers to automate jar filling with real-time feedback, LED/sound alerts, and precise lid control.
Raspberry Pi 5
Python
HX711
Stepper Motor
GUI
Automation
RAM – IoT Device for Leakage Current Monitoring — Industrial IoT device for measuring surge arrester leakage current. Includes nRF-based hardware, LoRa communication, and AWS IoT Core with Device Shadow integration for remote configuration and predictive maintenance.
nRF91
nRF52
ESP32
AWS IoT Core
LoRa
Edge Algorithms
Device Shadow
Smart Home Automation — MQTT-based home automation system with device control and monitoring through Node-RED and Raspberry Pi integration.
MQTT
Node-RED
Raspberry Pi
IoT
Automation
SpeedTestLogger — Python-based tool for logging and visualizing internet speed data over time for network performance analysis.
Python
Networking
Data Logging
Visualization
Crypto Trading Bot — Python-based trading bot implementing algorithmic strategies on pandas DataFrames with Flask-powered virtual exchange and full backtesting environment.
Python
pandas
Flask
Automation
Backtesting

Technologies & Skills

Focus Areas

IoT Systems Design

Reliability Engineering

Observability & Monitoring

Edge-to-Cloud Integration

Automation & Process Control

System Architecture

Cross-functional Leadership

Languages & Frameworks

Python

Java

C/C++

Bash

JavaScript/TypeScript

SQL

Django

Flask

Node.js

React.js

Next.js

Tkinter

PyQt

Node-RED

Crossbar.io (WAMP)

MQTT (Mosquitto, AWS IoT)

Embedded, Hardware & Cloud

Raspberry Pi

ESP32

STM32

nRF91/nRF52

Zephyr RTOS

LoRa/TTN

PCB Soldering & Reflow

End Switch Integration

3D Printing & Fusion 360 Design

Encoders & Motor Control

TMC2209

EC11 Encoder

AWS IoT Core

AWS Lambda

Device Shadow

MQTT

Docker

CI/CD

Node-RED

FUOTA (Firmware Update Over The Air)

Automation & Control

SCADA Systems

Process Control

PLC Communication

Touchscreen GUI Interfaces

Raspberry Pi GPIO Control

Data & Testing

pandas

numpy

matplotlib

seaborn

Data Analysis

Backtesting

Integration Testing

QA Automation

Regression Testing

REST Client Development

Python SDK Development

Test-Driven Development (TDD)

Software Engineering

Object-Oriented Programming (OOP)

Design Patterns

Asynchronous Systems

Refactoring & Clean Code

Code Architecture & Abstraction

Tools & Infrastructure

Git

GitHub

Docker

STM32CubeIDE

Fusion 360

OpenOCD

J-Link

Linux

Raspbian OS

VS Code

IntelliJ IDEA

PyCharm

WebStorm

Zabbix

Prometheus

Grafana

Copilot

ChatGPT

Ollama

Network Configuration & Diagnostics

MikroTik Router Setup

Languages

SlovenianNative

EnglishFluent

Experience

Technical Lead – Project RAM & IoT Solutions • Izoelektro d.o.o.

Jan 2023 – Nov 2025

Led development of leakage current monitoring system (RAM) using nRF chips and LoRa communication.
Designed and deployed AWS IoT Core architecture with MQTT and Device Shadow for remote configuration.
Developed Python SDK and REST client for device communication and testing.
Created algorithms for leakage current analysis, QA automation, and integration testing.
Built ICT and functional testing setups with OpenOCD and J-Link provisioning.
Supervised hardware prototyping, soldering, reflow, and PCB assembly.
Collaborated with IRNAS on firmware and hardware development for embedded systems.
Conducted high-voltage laboratory testing and SIQ product certification.
Maintained cloud infrastructure and monitoring (RAM-center).

Software Developer • Sportradar d.o.o.

Jan 2022 – Dec 2022

Developed backend services in Java, Python, and AWS Lambda.
Integrated AWS services: API Gateway, Cognito, Secrets Manager, and Python Authorizer.
Extended and maintained existing systems with improved performance and security.

QA Developer • Sportradar

May 2020 – Dec 2021

Designed regression and backend tests; upgraded and maintained testing frameworks.
Developed new automated testing framework and load testing tools.
Migrated CI/CD pipelines from Jenkins to GitLab, improving deployment efficiency.

Control System Programmer • Ledinek Engineering d.o.o.

Jan 2018 – Apr 2020

Developed full-stack SCADA solutions for CLT production lines.
Integrated RFID terminals and PLC systems for industrial control.
Built monitoring dashboards using Zabbix for production servers.

IT Technician Assistant • Na Zvezi d.o.o.

Mar 2016 – Dec 2017

Configured terminals and developed backend for InfoDisplay and TerminalRecorder projects.
Built Docker images and deployed systems using the Marathon platform.
Created GUI WAMP client applications for testing and monitoring.

Education

BSc in Informatics Engineering @ DOBA Faculty, Maribor

2025

Electrical Engineering – Computer Science @ Technical School of Electrical Engineering, Ptuj

2011

💡 Interested in collaboration or consulting for IoT, automation, or backend systems?