Daan Rosendal

Software Engineer

Zürich, Switzerland

Build

Pinboard for VS Code

I built a VS Code extension for pinning files and folders, born out of working in a huge monorepo at work. It has 780+ VS Code installs and 4,600+ Open VSX downloads as of today.

Since March 2026

A bookstore app for my mother

During the pandemic my mother opened a bookstore and kept track of her stock in Word documents. So I built her a Laravel app to manage it more easily.

April 2020

Compete

EPFL LauzHack Swisscom Challenge Winner

Won Swisscom's challenge at EPFL's LauzHack hackathon with Lauzcom Assistant, a customisable chatbot built in 24 hours with Carmen Marcos.

December 2023

Rocket League European University Champions

Founded a three-player team at Windesheim, won the University Rocketeers Winter Cup as the best university team in Europe at the time, and qualified directly for the European championship.

December 2021

Research

Published paper at IEEE Big Data 2025

Wrote a paper on federated learning with Dr. Ana Oprescu as part of my master's thesis at the University of Amsterdam, and presented it in Macao.

December 2025

CERN LHCb Ntupling Service

As an intern in CERN's Open Data team, I built the request system that lets physicists get custom LHCb datasets. The service won a Poster Award by popular vote in 2024.

February 2023 - March 2024

Professional Experience

Software Engineer Sep 2025 - Present

Lakera · Full-time Zürich, CHZürich, Switzerland
AI security startup, acquired by Check Point for $300M

Developing Lakera Guard, an AI security API protecting agents and applications by screening for prompt injections, data leakage, and content violations at sub-50ms latency for Fortune 500 clients, using Python, Go, and Kubernetes
Identified and engineered a 75% reduction in Kafka infrastructure costs through compression and batching, cutting projected annualised spend from $800K to $200K for a single 5k RPS client and saving millions across all clients
Cloud Solution ArchitectSolution Architect Feb 2025 - Aug 2025

Microsoft · Intern Amsterdam, NLAmsterdam, The Netherlands
Big Tech company empowering billions of users

Designed and implemented cloud architectures for enterprise clients to create Azure solutions with high availability, security, and scalability, using Azure, Python, C#, PostgreSQL, Kubernetes, Docker, RabbitMQ and GitHub Actions
Developed a multi-agent MCP solution for an enterprise client, using Python, Azure AI Foundry, and Semantic Kernel
Software Engineer Feb 2023 - Mar 2024

CERN · Intern Geneva, CHGeneva, Switzerland
European Organisation for Nuclear Research

Built a system that improves on-demand production and publishing of the particle accelerator's open data streams, allowing physicists all over the world to access 55 petabytes of LHCb data, using Go, JavaScript, React and npm packaging, earning a Poster Award by popular vote at the 2024 Conference on Computing in High Energy and Nuclear Physics
Enhanced REANA with workflow-sharing functionality in the web UI and CLI; used Python, Flask, Go, Conda and React
Set up 3 robust DevOps pipelines with automatic redeployment using Kubernetes, Docker, Helm, and GitLab CI/CD
Received consistent praise for excellent performance in both technical and social competencies across 5 evaluations
Owner Jan 2017 - Jan 2024

RL TrainerRocket League Trainer · Side Hustle Remote, NL/CHRemote, The Netherlands/Switzerland
Leveraged my Rocket League skills as a top 50 player worldwide to help clients all over the globe obtain their desired rank
Created and maintained a Discord server with over 500 customers which led to a 200% increase in orders

Software Engineer Dec 2021 - Jan 2023

Print.one · Part-time Zwolle, NLZwolle, The Netherlands
Direct mail automation startup

Developed a scalable microservice architecture that is capable of handling 10,000+ simultaneous requests to automate printing and sending personalised postcards, using TypeScript, React, Next.js, Tailwind, C#, GCP, Docker and Terraform
Measured the performance of different database management systems that are compatible with GCP and Prisma, and found that PostgreSQL was 2 times more efficient for this project's use case than the used DBMS (MySQL)
Software Engineer Apr 2021 - Dec 2021

Univé · Part-time Zwolle, NLZwolle, The Netherlands
Insurance company with over two million clients

Saved paralegals 20 hours per week by developing various single-page applications (SPAs) for the legal aid department (e.g., registering a legal case, adding documents to a legal case, filing complaints), using TypeScript and Angular
Created and led application presentations and sprint reviews to keep investors and stakeholders informed
Software Engineer Feb 2020 - Jul 2020

Deltion College · Intern Zwolle, NLZwolle, The Netherlands
Educational institution with over 20,000 students

Built a Progressive Web App (PWA) for the faculty of technology to replace the outdated WordPress website which led to a mobile traffic increase of 200% and a user satisfaction improvement of 75%, using PHP, Laravel and MySQL
Led the system design process of building an infrastructure with features like load-balancing, failover, and multi-master replication, which resulted in 99.99% server availability, using Linux, HAProxy, MySQL, and UML
Software Engineer Aug 2019 - Jan 2020

GWBO · Intern Kampen, NLKampen, The Netherlands
Architectural engineering consultancy company

Achieved a 400% improvement in architectural drafting efficiency by building two VBA applications that automated the engineering process of translating complex physics calculations to code

Education

Master of Science in Software EngineeringMSc. Software Engineering 2024 - 2025Sep 2024 - Jul 2025

University of Amsterdam Amsterdam, NLAmsterdam, The Netherlands
Top 5% of 80 students

Thesis within Distributed ML: Resolution Strategies for Client-Level Disagreements in Federated Learning
Courses: Distributed Computing, Software Maintainability, Requirements Engineering, Embedded Systems Design
Bachelor of Science in Software EngineeringBSc. Software Engineering 2020 - 2024Sep 2020 - Jul 2024

Windesheim University Zwolle, NLZwolle, The Netherlands
Top 1% of 500 students

Won Swisscom's LauzHack 2023 challenge at EPFL with a customisable chatbot capable of leveraging self-hosted LLMs
Courses: Data Structures & Algorithms, Design Patterns, Operating Systems, Discrete Mathematics, Statistics
Intermediate Vocational Degree in Software DevelopmentSoftware Development 2018 - 2020Sep 2018 - Jul 2020

Deltion College Zwolle, NLZwolle, The Netherlands

Top 1% of 200 students