An ESP32-S3 board and a small OLED display running on a page of handwritten Fourier analysis

AxelSundqvist

Hardware. Software. Systems. Fourth-year M.Sc. student in communication systems at Linköping University. R&D Intern experience in radio hardware drivers at Ericsson.

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The Radio Unit software team at Ericsson’s Kista campus
Ericsson Summer R&D Internship · Stockholm · 2026

Where the software touches silicon

I developed radio hardware drivers for Ericsson’s radios, worked target agnostic so one implementation serves several platforms, and delivered the nightly CI hardware tests that verify them.

Role
R&D Summer Intern
Team
Radio Unit XCS
Stack
Embedded Linux · C · Bash

Radio hardwareDriversHardware testingCI

LinkedIn
An ESP32-S3 development board wired to a small OLED display, resting on a page of handwritten Fourier analysis
Personal embedded project · ESP32-S3

Wireless control system design

I built a wireless ESP-IDF project: the board raises its own Wi-Fi access point and communicates over WebSocket, with FreeRTOS tasks, queues and priorities.

Target
ESP32-S3
Runtime
FreeRTOS / ESP-IDF
Protocol
Wi-Fi AP · WebSocket · SPI

CESP-IDFFreeRTOSWi-Fi

Source
An Infrasonik project slide: infrasound drying for grain and biomass, co-funded by the European Union, with RISE, Skogforsk and KR Teknik as partners
Infrasonik Intern · Stockholm · 2022—23

Drying grain with sound

Moving moisture with low-frequency pressure waves instead of heat. I worked with a small R&D team developing and testing infrasound-based grain-drying technology.

Role
Intern
Work
Prototype · lab test · docs
Result
Taken to product

InfrasoundPrototypingLab testing

A multi-horizon probabilistic forecast plotted against historical price data
Personal ML project · PyQuant

Forecasting over multiple horizons

I wrapped a Temporal Fusion Transformer in a pipeline that produces multi-horizon probabilistic forecasts, with automated nightly CI validation.

Model
Temporal Fusion Transformer
Stack
PyTorch · Market data vendors
Validation
Nightly CI

PythonPyTorchTime seriesCI

Source
Axel Sundqvist
Linköping · Stockholm

Who is Axel Sundqvist

Grain dryers, radio hardware, forecasting models. I like turning difficult problems into useful systems.

Studying
M.Sc. Applied Physics & EE
At
Linköping University, 2023-2028
Also
Behind the bar at VilleValla

CC++RustEmbedded LinuxESP-IDFPyTorch