C# / .NET Core Developer

  • Paris
  • Full-Time
  • Start Date: 01 February 2021
  • Apply Now


Founded in 2016 by two former incident responders from the French National Cybersecurity Agency (ANSSI), Alsid is a hypergrowth cybersecurity software company headquartered in Paris with a global reach.
Since Alsid’s inception, we’ve resolved to defend those few systems on the critical path of our adversaries. And one towers above them all: Active Directory. One system that we can protect and leverage to break our opponents’ operations.
This is our battlefield. And we own it.
We are lead by strong core values : humbleness, team spirit, drive, and passion for our product. This is how we built such an incredible team of 90.By joining us, you will have the opportunity to ambitious marge-scale security application to the next level in an agile and exciting environment. Alsid has always paid a great attention to its bright and outstanding people and therefore we keep on creating an environment in which they actually blossom. Alsid for AD disrupts the dynamic of most cyberthreats by exposing misconfigurations and detecting attacks before infection.
To do so we rely on a great technical team of 35, an awesome WW Sales Team of 30 ensuring our Worldwide presence, our best-in-class Digital Marketing and Evangelization Experts and our top notch Customer Care Specialist to make our client’s experience one they want to renew :).And of course, nothing happens without great Talent Acquisition Specialists : they’re our first ambassadors and will be your first contact at Alsid!

Job Description

To support the development of its game-changing technology, Alsid is looking for an experienced C# developer familiar with .NET Core and having a craving for data-intensive and real-time application.

Alsid’s core mission is to provide a versatile and cloud-oriented cyberattacks detection platform to help major companies secure their core information systems. As part as this position, you will join Alsid’s senior C# development team (10 years+) in charge of implementing the security engine empowering Alsid products.

Following a pair programming approach, you will also work side-by-side with Alsid’s cybersecurity team to implement new attack detection algorithms aiming to uncover targeted cyberattack on large scale infrastructure.

By joining us, you will have the opportunity to bring security applications to the next level in a fast-paced, agile, and exciting environment. No knowledge of cybersecurity is required! You will in a integrate a deep-tech development team of more than 20 persons eager to share their knowledge about cybersecurity and complex software design.


You will join Alsid’s C# squad in charge of the company’s flagship products development. Your day-to-day work will be focusing on implementing the core security framework of the company. Your daily missions will include:

  • Implement Alsid’s core security framework capabilities using our technological stack (.NET Core/C#)
  • Managing performance of a real-time micro-services connected to a message broker (RabbitMQ)
  • Design modern attack detection algorithms by working jointly with Alsid’s security team
  • Develop test-driven components able to perform in a large-scale continuous integration workflow
  • Contribute daily to all parts of our application’s code base, using our SCRUM-based development workflow
  • Tackle a wide variety of technical problems

Preferred Experience


  • 2+ years in .NET or C# development with strong production experience

Required skills

  • Experience in .NET Core 3.X
  • Fluent with professional development and tooling (Gitflow, Github, Azure DevOps, etc.)
  • Willing to operate day-to-day in a test-driven environment using unit and functional tests
  • Have a general knowledge of complex algorithm challenges (such as memory optimization, run time management, multithreading approach, design patterns, etc.)
  • Basic knowledge on system development (mainly Windows)
  • Versatile developer eager to work with modern and sometimes bleeding-edge technologies
  • Ability to rank and manage multiple and conflicting priorities with tight deadlines
  • Basic English speaking

Valuable skills

  • Experienced with big data or real-time application
  • Great knowledge about Computer Science fundamentals
  • Experienced in typed language paradigm
  • Knowledge of our tech stack: C++, Node, .NET, RabbitMQ, MS SQL, GraphQL, ReactJS

Recruitment Process

HR interview + meeting of the tech team!

Additional Information

  • Contract Type: Full-Time
  • Start Date: 01 February 2021
  • Location: Paris, France (75003)
  • Education Level: Master's Degree
  • Experience: > 2 years
  • Possible full remote