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Internship - Software Engineer - Backend / Fullstack Job Opening In Paris – Now Hiring Numberly


Job description




Numberly is recognized as one of the world's leading data marketing specialists with nearly 500 employees and 8 offices worldwide serving more than 500 blue-chip clients (L'Oréal, Sanofi, Moleskine, Campari, Nestlé, HSBC..).

By putting technology to work for brands and consumers, Numberly is at the heart of business growth and everyone's desire for more sustainable and relevant marketing.

Numberly leverages the latest advances in data processing, analysis and activation, incorporating artificial intelligence technologies.

This approach is part of a virtuous circle in which business competitiveness goes hand in hand with greater respect for privacy and data protection.

Team Description:






The NMP team is a diverse, multidisciplinary group that includes developers (fullstack, backend, and frontend), product owners, UX/UI designers, and product support specialists.

The team is responsible for developing and maintaining the Numberly MarTech Platform, a comprehensive suite of applications designed to create and analyze campaigns across all digital channels, including email, SMS, push notifications, Facebook, and more.

As the stability and the maintainability of our product is one of our main concerns, we give a high importance to the quality of our code, the constant updating of our technical stack and the efficiency of our processes.

To optimize our roadmap delivery and organization, the team is structured into squads, each with its own dedicated scope.

Your Mission:

As an intern, you will join one of these squads where you will be assisted by a technical lead.

Your role will consist in:






  • Supporting the run of the squad

  • Improving our deployment and monitoring processes, keeping our technical stack up to date and improving the performance of the platform

  • Collaborating with a product owner and our UX/UI designers to develop new features

  • Bringing your own ideas about technical subjects but also the tech at Numberly


This internship is available for January 2026.


What we would love:


  • A collaborative spirit and readiness to work closely with developers and stakeholders.

  • Daily use of Linux is very preferable but not required.

  • Familiarity with techno we are using (see below) and especially our backend stack.

  • Being a fullstack developer with some knowledge in Vue 3 is a great plus but isn’t required.

  • Open-source contributions.

  • Ability to document, explain, and advocate for technical decisions.


Tech Radar:







  • Backend: Python (FastAPI)

  • Frontend: Vue 3 (TypeScript)

  • Databases: PostgreSQL & MSSQL

  • Messaging & Events: Kafka

  • DevOps: Kubernetes, Docker, GitLab CI/CD

  • Testing: Cypress (E2E), Pytest (unit & integration)

  • Observability: Grafana, Sentry, Prometheus, Graylog



Additional information:


  • At Numberly, we share a passion for transmission: weekly internal talks, meetings with expert professionals in their field, continuous learning.

  • Fast and powerful onboarding, in particular thanks to: the mentor assigned to each newcomer; to Live my life in different teams; Happy Meetings: monthly internal meetings to meet up with all our teams around the world and share group news.

  • We cultivate freedom of speech which allows everyone to participate in the development of the group.

  • We act positively on our ecosystem through and via our activities which create value in the Open Internet and contribute to the enrichment of Open Source.

  • Numberly is an actor of diversity with a gender equity score of 97/100.

  • Numberly is an international environment with more than 30 nationalities in our teams.

  • Offices in the image of each of the teams, a generous library, a large fully equipped music studio, two cats, selective sorting and vermicomposting, the possibility of bringing your pet and space for bicycles! In each kitchen: coffee, tea, unlimited infusions and also mystery lunches, Wellpass (ex-Gymlib) partnership, sports classes and parties (often in disguise).

  • Possibility to be remote up to 50% of your time (to be organized as you wish) and to work up to 60 consecutive (working) days remotely.

  • Swile card (meal vouchers).

  • Possible mobility in our various offices abroad.

  • Numberly welcomes people with disabilities.


Required Skill Profession

Computer Occupations


  • Job Details

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The Work Culture

An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at Numberly adheres to the cultural norms as outlined by Expertini.

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2. Loyalty

3. Impartiapty

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