Steffen Kappler - Embedded Software Developer in C/C++

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Karlsruhe, Germany

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Experience

Dec 2024 - Feb 2025

3 months

Karlsruhe, Germany

Freelancer – Software Development

LightnTec GmbH

Implemented an RGBW function on a microcontroller to drive flexible LED matrix displays in Embedded C
Implemented various algorithms to calculate a white channel
Expanded a web interface

May 2024 - Jul 2024

3 months

Karlsruhe, Germany

Freelancer – Software Development

LightnTec GmbH

Implemented the sACN protocol on a microcontroller to drive flexible LED matrix displays in Embedded C

Aug 2023 - Nov 2024

1 year 4 months

Remshalden, Germany

Freelancer – Software Development

Kurz Industrie-Elektronik GmbH

Defined and implemented a protocol for data exchange between multiple microcontrollers via SPI, Bluetooth, and UART
Implemented software for low-latency Bluetooth data transfer on a microcontroller using the nRF Connect SDK in Embedded C and Zephyr OS with multiple participants (multilink)
Controlled BLDC motors on a microcontroller using STM Motor Control in Embedded C
Evaluated software frameworks (LVGL and Segger emWin) for a graphical user interface on a microcontroller
Commissioned a motor control hardware component
Developed a software solution for a motor test stand on a microcontroller in Embedded C and FreeRTOS, including implementing the Modbus RTU protocol to control the electronic load and the speed sensor
Implemented a control algorithm (PI controller) to improve the speed control of a BLDC motor and read an angle sensor over I2C
Implemented debug output over USB (virtual COM port)

Mar 2019 - Aug 2023

4 years 6 months

Karlsruhe, Germany

Employee – Software Development

LightnTec GmbH

Developed new and improved systems for controlling flexible LED matrix displays
Developed software solutions for microcontrollers and system-on-modules in Embedded C/C++ and Python
Implemented an RS485-based protocol in Python
Enhanced a Linux-based Artnet media server using Golang, JavaScript, React, as well as Docker and Bash scripts
Configured systems using HTML and JavaScript
Performed system tests
Commissioned systems in the field
Configured and installed customer projects

Feb 2018 - Jul 2018

6 months

Karlsruhe, Germany

Working Student – Hardware Development

Vigem GmbH

Developed an IP core for capturing MIPI-CSI2 image data

Mar 2017 - Apr 2017

2 months

Karlsruhe, Germany

Self-employed – Software Development

Panta Rhei Design

Implementation of a deep discharge protection function for batteries on a microcontroller

Mar 2016 - Aug 2016

6 months

Karlsruhe, Germany

Practical study semester – Hardware Development

INIT GmbH

Conceptualization and implementation of electronic assemblies
Development of a test bench for assemblies

Mar 2015 - Apr 2015

2 months

Karlsruhe, Germany

Self-employed – Software Development

Panta Rhei Design

Development of a DMX node for controlling RGB LEDs on a microcontroller

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Manufacturing and Information Technology.

Manufacturing

Information Technology

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Product Development, Information Technology, and Quality Assurance.

Product Development

Information Technology

Quality Assurance

Skills

Professional Focus Areas

Embedded Software Development In C/C++
Real-Time Operating Systems
Backend Development In Golang, Python
Frontend Development In Javascript, React
Development Of Led Matrix Displays

Skills

Programming Languages: Embedded C/C++, Javascript, Golang, Python, Vhdl, Bash
Frameworks: Keil Mdk Middleware, Cycloneboot, React, Stm Motor Control, Nordic Nrf5 Sdk
Ides: Keil Mdk µVision, Stm32cubeide, Segger Embedded Studio, Vs Code, Clion, Goland, Atmel Studio, Xilinx Vivado
Tools: Git, Svn, Eagle, Altium Designer, Ltspice, Docker
Hardware Platforms: Stm32, Atmega, Raspberry Pi, Nordic Nrf52
Platforms: Keil Rtx Rtos, Freertos, Linux, Zephyr Os
Protocols: Spi, I2c, Uart, Ethernet, Tcp/Ip, Udp, Http, Bluetooth Low Energy, Artnet, Modbus Rtu
Test Equipment: Oscilloscope, Logic Analyzer, Multimeter

Languages

German

Native

English

Advanced

Education

Oct 2013 - Jul 2018

Karlsruhe University of Applied Sciences

Bachelor of Engineering in Electrical Engineering – Information Technology · Electrical Engineering – Information Technology · Karlsruhe, Germany

Sep 2008 - Jan 2011

Electronics technician for devices and systems · Bad Wildbad, Germany

Statistics

Experience

Total positions 8

Experience in Manufacturing 7 y

Avg length 11 m

Longest experience 4 y 5 m

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Freelancer – Software Development, Employee – Software Development, Working Student – Hardware Development

Main industries Manufacturing, Information Technology

Main business areas Product Development, Information Technology, Quality Assurance

Qualifications

Highest degree Bachelor

Profile

Created

October 2024

Last Update

June 2026

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Frequently asked questions

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Steffen is based in Karlsruhe, Germany and can operate in on-site, hybrid, and remote work models.

Steffen speaks the following languages: German (Native), English (Advanced).

Steffen has at least 7 years of experience. During this time, Steffen has worked in at least 5 different roles and for 5 different companies. The average length of individual experience is 1 year and 10 months. Note that Steffen may not have shared all experience and actually has more experience.

Based on recent experience, Steffen would be well-suited for roles such as: Freelancer – Software Development, Employee – Software Development, Working Student – Hardware Development.

Steffen's most recent position is Freelancer – Software Development at LightnTec GmbH.

In recent years, Steffen has worked for LightnTec GmbH and Kurz Industrie-Elektronik GmbH.

Steffen is most experienced in industries like Manufacturing and Information Technology.

Steffen is most experienced in business areas like Product Development, Information Technology, and Quality Assurance.

Steffen has recently worked in industries like Manufacturing and Information Technology.

Steffen has recently worked in business areas like Product Development, Information Technology, and Quality Assurance.

Steffen holds a Bachelor in Electrical Engineering – Information Technology from Karlsruhe University of Applied Sciences.

Steffen is immediately available full-time for suitable projects.

Daily Rate Distribution

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<€480 €480-640 €640-800 €800-960 €960+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Average rates for similar positions

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Daily rate avg. 819 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000

750

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Median rate 856 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.