Full Stack Web Developer Intern (React / TypeScript) - Crypto

About the company At Aplo, you won’t just do a job - you’ll own outcomes, grow every day, and work with a team that wins together. Aplo is the only EU-registered crypto prime broker for institutional investors offering transparent, conflict-free, self-service execution with fast asset listing across hundreds of coins. In October 2025, Aplo was acquired by Coincheck N.V. (Nasdaq CNCK), a publicly listed company.

We combine the agility of a startup with the rigor of a regulated financial institution, giving institutional clients access to crypto markets with the reliability of traditional finance. About the internship As a Full Stack Web Developer Intern, you will join the engineering team and report directly to the CTO. You will work closely with two full stack developers and contribute to building and improving Aplo’s platform used by institutional clients.

This is a hands-on internship with real ownership: you will work on production features from day one, not side projects. You will progressively get involved in the full development lifecycle:

Understanding product needs

Designing simple and effective solutions

Developing features (frontend and backend)

Testing and improving what you build

Participating in releases You will be supported by the team while being expected to grow quickly and take ownership of your work. This is a demanding environment, but also a place where you can learn faster than in most internships.

What you will do Build and ship features across the stack (frontend and backend)

Improve user interfaces to make them clear, fast and intuitive

Contribute to backend logic and APIs

Write clean, maintainable and production-ready code

Test, debug and improve your work

Improve performance and reliability of the platform

Apply strong security practices Your work will be used in production and will directly impact users. What you will learn How to build and ship production-grade features end-to-end

How to write clean, maintainable code in a real engineering environment

How to work on performance, reliability and security in a live product

How to collaborate with experienced engineers and level up quickly through feedback

How a high-standard engineering team operates in a fast-moving environment Tech environment You will work in a modern web environment built for performance, reliability and scalability, including: JavaScript / TypeScript across the stack A modern frontend architecture (React)

Backend services and APIs handling real-time and business-critical logic

Relational databases for structured data

Testing tools and workflows ensuring code quality and stability You will also be exposed to production systems, high engineering standards and security best practices in a demanding environment.

Profile

Final-year student (Master’s degree or equivalent) in computer science or related field

End-of-studies internship only Skills

Good understanding of web development basics

Comfortable with JavaScript or TypeScript

First experience with a frontend framework (such as React)

Basic understanding of APIs and databases

Interest in writing clean and structured code Nice to have Interest in crypto or financial systems

Awareness of performance and security topics What we look for Motivation to learn and improve quickly

Our environment evolves fast, so your ability to ramp up quickly is key Ability to take feedback and progress

You’ll work closely with experienced engineers and grow through iteration Attention to detail

Small mistakes can have real impact in a production trading environment Problem-solving mindset

You’ll face real technical challenges that require structured thinking Ability to work in a team

Collaboration is key to shipping reliable and high-quality features Practical details Location: Paris

Work setup: Hybrid

Duration: 6 months

Internship agreement required

Languages: French and English (C2 level required) Compensation & Benefits €26,500 annualized internship stipend (paid monthly)

Lunch vouchers (€12.20 per day worked)

Full public transport reimbursement (Navigo pass)

Monthly sports subscription reimbursement (€45)

Annual culture allowance (€200) This internship is designed as a potential full-time opportunity.

Strong performance during the internship can lead to a full-time position (CDI) within the engineering team.