Internship - Full Stack Payment Developer (TypeScript / Go) - Financial Services - Paris (KaNest XGen)

Sopra Steria, a major player in Tech in Europe, with 51,000 employees in nearly 30 countries, is recognized for its consulting, digital services, and solutions. It helps its clients lead their digital transformation and achieve concrete and sustainable benefits. The Group provides a comprehensive response to the competitiveness challenges of large companies and organizations, by combining in-depth knowledge of business sectors and technologies with a collaborative approach.

Sopra Steria places people at the heart of its actions and is committed to working with its clients to make the most of digital technology to build a positive future. In 2025, the Group achieved a turnover of 5.6 billion euros.

As an Intern Developer, you will join the R&D team in charge of KaNest XGen, our testing and homologation solution dedicated to payment and banking actors. You will participate in the development and evolution of an innovative product in a modern technical environment.

Your main responsibilities will be:

• Participate in the analysis of functional and technical requirements;
• Develop features in TypeScript and Go;
• Contribute to the creation of web interfaces and cloud-native components;
• Participate in interactions with databases and application services;
• Perform unit tests and contribute to integration tests;
• Participate in technical documentation and code reviews.

You will work within a multidisciplinary team composed of developers, Tech Leads, Business Analysts, QA, and DevOps, operating according to an agile methodology.

During your internship, you will be led to:

• Discover professional development practices (Git, continuous integration, code reviews)
• Use team monitoring and collaboration tools (Jira, Confluence, CI/CD);
• Apply software quality best practices;
• Develop skills in cloud technologies, testing, and the electronic payments domain;
• Benefit from regular support from a mentor and a technical referent.

This experience will allow you to develop your technical skills while contributing to a recognized product in the payments ecosystem.

Your profile:

You are in your final year of an engineering school or university program with a specialization in computer science or software development, and you are looking for a final study internship in an innovative environment.

You have good foundations in software development. Previous experience with TypeScript, REST APIs, databases, Git, or automated testing is a plus.

Curious, rigorous, and motivated, you enjoy learning and working in a team. You wish to develop your technical skills while discovering the challenges of the payments and banking domain.

You are sensitive to development best practices (code quality, testing, documentation) and have a good level of technical English.

What we offer you

• Introduction to the business world, particularly the banking domain.
• An immersion in modern technologies (TypeScript, Go, Cloud Native, Kubernetes);
• Several hundred training courses accessible autonomously from the mobile app with Sopra Steria Academy.
• Participation in real projects supervised by domain experts
• Building a positive future by putting digital at the service of people
• A work organization that guarantees a real work-life balance

As an inclusive and committed employer, our company works every day to combat all forms of discrimination and promote a respectful work environment. Therefore, committed to gender balance and diversity, we encourage all applications and all profiles.

As an inclusive and committed employer, our company works every day to combat all forms of discrimination and promote a respectful work environment. Therefore, committed to gender balance and diversity, we encourage all applications and all profiles.

https://www.soprasteria.fr/nous-connaitre/nos-engagements