Intern Software Engineer - Compilers (WebAssembly) - Amsterdam [two positions] (Remote)

Do you want to work at the cutting edge of browser technologies? Are you interested in working on Development Tools?

Join our engineering team, where you will be working on the next generation of compilers and virtual machines that target HTML5/WebAssembly, contributing to our vision of bringing any application to the Web. We are looking for an enthusiastic developer-to-be, interested in joining a very dynamic specialist software company developing WebAssembly solutions.

This is a full-time paid internship position based in Amsterdam (near Amstel station), Netherlands, with a duration of 6 months, starting in October/November 2025.

What we offer

• Flexibility and part-remote work is guaranteed to all employees
• Join a team of incredibly talented minds, in a position with plenty of opportunities for personal and professional growth
• Get to work on challenging, complex and stimulating projects
• You will work with our CTO and other developers, and get 1-1 tutoring and guidance from the rest of the team. We have very minimal overhead, a flat structure, and we prefer to get to work rather than spend hours in meetings
• We offer high flexibility, family-friendly arrangements, and actively promote a good work-life balance

What you will be doing

Each internship position will be focusing on one core development project, to be driven by the intern, under the 1-1 supervision of a senior developer.

During your internship you will be contributing to Cheerp (https://cheerp.io), our open source C++ to JavaScript and WebAssembly compiler. It’s a mature LLVM based compiler with a broad set of web-specific features, and the core foundational technology of all of the Leaning Technologies stack.

Project 1: Improve the performance of Cheerp, our C++ compiler for WebAssembly

• Learn to use linux profiling tools
• Analyze the compiler in a variety of workloads and identify slow functions
• Improve the performance of the identified functions

Project 2: Rewrite Cheerp's custom test runner using LLVM's test infrastructure

• Familiarize yourself with our test suite and its requirements
• Investigate how the LLVM testing infrastructure work
• Port the tests from one system to the other

Requirements

• Being enrolled in a BSc/MSc or alternative education program in Computer Science or equivalent, ideally in the last year. Working experience in alternative will also be considered.
• Some practical C/C++ development experience (including University projects) is required
• Understanding of object-oriented design principles
• Residence and right to work in the Netherlands

About Leaning Technologies

Leaning Technologies (https://www.leaningtech.com) makes WebAssembly tools to run any software on any browser.

We make solutions that enable C/C++, Java, Flash, and native Linux applications to be compiled, emulated and virtualised into HTML5/WebAssembly. Our tools are used to develop high-performance web apps in ‘traditional’ programming languages, to port existing code to the Web, or to preserve legacy applications by converting/emulating them to HTML5. We have a global client base including multiple Fortune-100 companies and public sector organisations, in sectors including financial services, CAD software, HR and operations, logistics, defence and aerospace, retail, science and education, and videogames.

Our incredibly talented, tight-knit team works from different locations with a hybrid remote/office approach. Our main offices are Leeds, United Kingdom and Amsterdam, The Netherlands. We value a great, informal work environment, high flexibility, and having genuine fun and excitement every day at work.

Want to see what it is all about? Join our Discord: https://discord.leaningtech.com/ and have a chat with our developers!