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

Leaning Technologies; United States; Hybrid; USD 18,000 - 21,000; Full time

Job summary

Leaning Technologies is seeking an intern to contribute to browser-based compiler and VM projects in Amsterdam. The six-month, full-time program starts in spring 2026, with a lead project and guidance from a senior developer.

The role includes paid mentoring and hands-on work on JIT compilers and testing infrastructure. The ideal candidate is pursuing a CS degree, has practical C/C++ development experience, understands OO design, and can work in the Netherlands with valid authorization.

Qualifications

• Enrollment in a computer science degree or equivalent education program (candidates near end preferred).
• Demonstrated C or C++ development experience.
• Understanding of object-oriented design principles.

Responsibilities

• Learn how a Java VM and its JIT compiler operate, then implement self-contained compiler improvements.
• Familiarize with Nix and help design/build testing infrastructure for browser workloads within CI.
• Add test workflows for products and contribute to the project through implementation and iteration.
• Work closely with a senior developer and with guidance from the wider engineering team.

Skills

C/C++ development

Object-oriented design

Education

CS degree or equivalent

Tools

Nix

Job description

Role overview

Contribute to browser-based compiler, virtual machine, and testing projects that bring software to HTML5 and WebAssembly. This is a six-month, full-time paid internship in Amsterdam, starting in April or May 2026. The intern will lead one focused development project with individual guidance from a senior developer.

Responsibilities

• For one project, learn how a Java virtual machine and its just-in-time compiler operate, then implement self-contained compiler improvements.
• For the other project, become familiar with Nix and help design and build testing infrastructure for browser workloads within a continuous integration system.
• Add test workflows for products and contribute to the selected project through implementation and iteration.
• Work closely with a senior developer, with access to guidance from the wider engineering team.

Requirements

• Enrollment in a computer science degree or equivalent education program; candidates near the end of their studies are preferred. Relevant work experience may also be considered.
• Practical C or C++ development experience, including experience gained through university projects.
• Understanding of object-oriented design principles.
• Residence in the Netherlands and authorization to work there.

Nice to have

• Interest in compilers, virtual machines, browser technologies, or deterministic build and testing systems would be relevant to the project options.

Benefits and work setup

The internship is paid at €1,600 per month and is based in Amsterdam with part-remote flexibility. The role offers one-to-one tutoring, challenging project work, flexible and family-friendly arrangements, and an emphasis on work-life balance.