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 and rapidly growing 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 April/May 2026.
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.
We offer high flexibility, family-friendly arrangements, and actively promote a good work-life balance.
This is a paid internship, you'll be compensated at 1600 EUR per month.
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.
Project 1: Improve CheerpJ JIT
CheerpJ ( is Java Virtual Machine that runs fully in the browser. It can run large scale Java applications and applets with no modifications, including code that uses multi-threading, reflection and other advanced Java features. CheerpJ uses it's sophisticated Just-In-Time compiler to build JavaScript functions out of the original Java bytecode. Project 2: Create new a new testing infrastructure using Nix
Nix is a functional package manager that allows you to manage system configurations and packages deterministically via it's own functional programming language. We are in the process of building a Nix-based CI, and the next step is adding infrastructure to run workloads in the browser in order to test our products.
Design and implement a new testing infrastructure to fit in with our CI
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
Leaning Technologies ( 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. Join our Discord: and have a chat with our developers!
Remote Intern Software Engineer - Compilers (WebAssembly) - Amsterdam [two positions] (Remote) in Northwich employer: Leaning Technologies
Leaning Technologies is an exceptional employer for aspiring software engineers, offering a dynamic and innovative work environment in Amsterdam. With a strong focus on personal and professional growth, interns benefit from 1-1 mentorship with senior developers, engaging in challenging projects that push the boundaries of browser technologies. The company promotes a flexible work culture, ensuring a healthy work-life balance while providing competitive compensation and opportunities to collaborate with a talented team on cutting-edge WebAssembly solutions.
