Daan Rosendal

Professional Experience

• 
  Software Engineer Sep 2025 – Present

  Lakera · Full-time Zurich, CHZurich, 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
  • Enhanced REANA with workflow-sharing functionality in the web UI and CLI, earning a Poster Award by popular vote at the 2024 Conference on Computing in High Energy and Nuclear Physics; 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