Intern Abroad

• Electrical Engineering, Information Technology and Computer Engineering M.Sc.
• Belgium, Leuven
• Axelera AI N.V.
• 11/2024 – 04/2025

1 Application

I discovered the internship posting on LinkedIn and applied via the official Axelera careers page in late July 2024. A few days later, I had a first screening call with the hiring manager who would be supervising my internship. Next there were two longer technical interviews to assess my abilities in software and hardware development. Finally, an executive interview with the team manager and an HR interview about cultural fit and compensation, respectively, concluded the process by late August. As soon as I had received the signed work contract, I applied for Erasmus internship support from RWTH, which required some more forms and signatures.

2 Accommodation

Leuven is a student town, owing to the presence of KU Leuven. This is Belgium’s largest university by number of enrolled students. For this reason, both studios and shared flats are widespread throughout the city, but nevertheless highly sought after.

A surprising number of accommodations is advertised and rented through Facebook, which was also how I eventually found the place I stayed at. It was a room in a shared house, within walking distance of the train station and my workplace. Like most rental contracts, mine had a fixed duration of one year, with a fee for early termination that I had to pay since I left earlier. The room also came furnished, so I could move to Leuven comfortably by train from Aachen, bringing just clothing, my bike and other personal items.

3 Costs

The rent was €520 with all amenities included, which was a fairly average market rate based on my impression. Overall, housing seemed to be slightly more expensive than in Aachen, especially for studio apartments where rent could reach €1000+.

In general, most items and services seemed to cost approximately 20% more than one might be used to from Germany. This becomes apparent at restaurants, but also for groceries and other everyday purchases.

One notable exception to the higher prices is train travel. A youth ticket for any route inside Belgium with any SNCB train costs about €8 regardless of time or distance, and can become even cheaper if bought in bulk or when traveling during the weekend. Furthermore, Belgian trains are very rarely delayed.

4 Work

The project I would complete during my internship was already outlined in the job description. Its main goal was to develop a compressor block in hardware that would reduce the amount of intermediate data to be transferred inside the Axelera AI processing unit during inference. Ultimately, this would enable higher energy efficiency and performance at the cost of slightly increased chip area and complexity.

My project was structured in the phases of algorithm research in the scientific literature, prototyping of promising algorithms in Python, and finally implementation of one or more algorithms in Verilog for integration within the DMA unit.

Even though Axelera generally allows remote work, the internship contract required 100% time in the office. This facilitated deeper connection and better knowledge exchange with my colleagues, and was easily doable for me with a 10-minute walking commute.

While several employees in the System Architecture team were located in Leuven, my direct manager was based in Zurich. To enable better collaboration, we strived to meet physically once per month. Sometimes, she came to Leuven, but I also traveled to Zurich on several occasions for one week at a time. All travel expenses were covered by Axelera.

5 Everyday Life

Leuven is located in Flanders, the Dutch-speaking part of Belgium. To blend in better with everyday life, I decided to learn Dutch and reached B1 level. Reading and writing is relatively easy as German native speaker, while speaking and listening may be slightly more difficult. I attended courses at CLT, a language school affiliated with KU Leuven. These courses took place twice a week in the evening, and the classroom was easily reachable on foot. On other days, I went to a nearby gym and joined the local running club.

Supermarkets close earlier in Leuven compared to Germany, which meant that I mostly had to do groceries on Saturdays. This also applied to other time-intensive activities, such as travel.

Belfry in Ghent
©Thorben Fetz

Liège Waffle
©Thorben Fetz

MAS in Antwerp
©Thorben Fetz

Taking advantage of the aforementioned very affordable train tickets, I visited most larger Belgian cities during weekends. Brussels is just 20 minutes away, but also Li`ege, Mechelen, Antwerp, Ghent or Bruges can be reached with direct connections. Even going to the seaside in Ostend takes less than 2 hours.

Train World
©Thorben Fetz

Inside the Atomium
©Thorben Fetz

Some other attractions I visited include TrainWorld in Schaerbeek and the Atomium in Brussels. Many museums offer discounted entry for students.

6 Conclusion

Overall, I am very grateful for the opportunity of conducting my internship at Axelera AI in Leuven. The experience has been invaluable, allowing me to develop both technical skills in algorithm and hardware design, as well as soft skills through international collaboration. Living in Belgium broadened my cultural horizons, while learning Dutch facilitated daily interactions.

The Erasmus funding was welcome in making this experience possible, covering relocation costs and a portion of the living expenses. This support allowed me to focus fully on my professional development and cultural immersion.