limetip.com
LimeTip
Simplify VAT compliance a powerful API.
I’m Arvid Berndtsson - I build tools, secure things, and sometimes over-automate.
Software engineer focused on security, automation and reliable systems. Working at Vertiseit and exploring security hands-on in his spare time.
Thoughts on security, Tools and the occasional rabbit holes.
My works are featured on
Products
Thoughts
When PyPI Becomes the Attack Vector: 39,000+ Downloads of Malicious Python Packages
Three Python packages made it onto PyPI, stole data, validated stolen credit cards, and were downloaded over 39,000 times. Here’s how they worked and what we can learn from it.
Free Document Converters - Now With Bonus Malware
The FBI warns that some free online converters are more than helpful; they hide malware, steal data, and sometimes drop ransomware.
Why LazyGit is My Favorite Git Tool (Even Over the CLI)
I’ve used plenty of Git tools—Sourcetree, GitHub Desktop, Gitbutler—but none of them stuck. Then, I found LazyGit. It’s fast, efficient, and keeps the power of Git at my fingertips without the friction of typing everything manually. Here’s why it’s my go-to Git tool.
The Benefits and Drawbacks of Serverless Architecture
Serverless architecture offers scalability, cost efficiency, and faster development but comes with challenges like cold starts and vendor lock-in. Explore its pros, cons, and why it could dominate the future of app development.
What response formats are supported in REST APIs?
Before discussing the various formats supported by REST APIs, it's important to note that JSON (JavaScript Object Notation)
What are TCP Listeners and Streams? (Beginner's Guide)
Discover how popular chat apps like WhatsApp and Discord communicate behind the scenes using TCP. This beginner-friendly guide explains TCP Listeners and Streams using simple analogies and practical Python examples you can try yourself.
Where should I host my portfolio?
In this blog post, I compare Azure, AWS, and Railway, highlighting why Railway is the best choice for developers, especially students building portfolio websites. Inspired by discussions with my classmates about job readiness. Ready to dive in? Check out my promo link to get started with Railway!
Portfolio
Experiences
Software Developer
Vertiseit AB (publ)
Jan 2023 - Present
Teaching Assistant (Amanuens)
Malmö Universitet
Aug 2024 - Present
Founder
LimeTip
May 2024 - Present
Software Developer Intern
Voyado
Sep 2024 - Jan 2025
Co-Founder
Merely Emissions
Mar 2023 - Jan 2024
Bachelor Student - CS and Information Architecture
Malmö University
Aug 2022 - Jun 2025
Junior Software Developer
Vertiseit AB (publ)
Oct 2021 - Jan 2023
Junior Software Developer
Vertiseit AB (publ)
Jul 2021 - Jul 2021
Master Student - Drop out - Computer Security
Blekinge Institute of Technology
Aug 2020 - Oct 2021
Designer
Freelance
May 2020 - Aug 2020
Founder / Web Developer
Strato UF
Oct 2018 - May 2019