XCP-ng XAPI Developer

10 Esplanade Andry-Farcy, 38000 Grenoble Permanent contract Remote working 35 000 - 50 000 € per year

Job description

Vates is a French software company specializing in Open Source and virtualization, with a strong commitment to open and collaborative development. Our main projects, Xen Orchestra and XCP-ng, cover the entire virtualization stack — from the hypervisor (Xen) and the virtualization platform (XCP-ng) to virtual machine management and backup (Xen Orchestra). Our company operates in an international environment, working fully remotely, fluent English required.

Join a passionate engineering team where open-source principles, technical excellence, and collaboration drive innovation. As a XAPI Developer at VATES, you will contribute directly to the evolution of XCP-ng, a leading open-source virtualization platform.

**Your Responsibilities** :

• Design and implement new features in XAPI

• Define and drive the technical roadmap for XAPI

• Optimize the performance and reliability of XAPI

• Analyze and resolve technical issues identified in XAPI

• Provide ongoing support and maintenance for XAPI and XCP-ng

• Participate in XAPI as an open-source project: review contributions, maintain the CI, take care of LTS branches

• Write technical and functional documentation

• Write automated tests

• Collaborate with cross-functional teams, stakeholders, and external projects

**Required Skills** :

-Experience in OCaml or with another functional programming language

• Proficiency in Git

• Experience in Linux, distributed programming or systems programming

**Nice to Have**

• Experience with testing environments (Jenkins/pytest)

• Experience in Open-Source projects

• Knowledge of virtualization

**Soft Skills**

• Strong analytical and problem-solving skills

• Excellent communication and teamwork abilities

• Attention to detail and commitment to quality

• Proactive mindset with a continuous improvement approach

• Curiosity and willingness to learn new technologies

• Adaptability in a fast-evolving technical environment

• Fluent in English

**Why join us** ?

At VATES, you will find a flexible work environment, a supportive and approachable team, and a role that makes a real impact on a daily basis.

**Location** :

Our offices are based in Grenoble or Paris, but we operate on a fully remote model to provide greater flexibility and daily work comfort.

You are free to work 100% remotely or come on-site occasionally, depending on your preferences.

**Benefits**:

-Health insurance coverage funded at 50% by the company

-Benefits provided by the Works Council (employee discounts, cinema tickets, etc.)

-Employee savings plan (PEE)

-Profit-sharing scheme

-Annual bonus

-100% remote work

As part of our diversity and inclusion policy, this position is open to all candidates, regardless of gender.

Profile required

This position is ideal for a software engineer who enjoys working close to the core of a virtualization platform and tackling challenging technical problems.

We are looking for someone with:

• Bachelor’s degree to a Master’s degree in Computer Science, software engineering, software development, or information systems
• 5 years of experience on development project in langage OCAML or several years of experience without degree.
• A professional experience in development within an open source environment is appreciated.
• Fluent English.

Company description

Vates is a French software company specializing in Open Source and virtualization, with a strong commitment to open and collaborative development. Our main projects, Xen Orchestra and XCP-ng, cover the entire virtualization stack — from the hypervisor (Xen) and the virtualization platform (XCP-ng) to virtual machine management and backup (Xen Orchestra).

Our team is distributed across several countries and fully embraces remote work, with transparent working methods and accessible communication channels. At Vates, we are driven by a people-centered company culture focused on kindness, inclusivity, and a flat organizational structure. Every team member is encouraged to contribute ideas, make decisions, and grow with the company.

Our Open Source model is at the core of everything we do — not only in our code, available on GitHub and GitLab, but also in our collaborative approach with the community. We believe in an “upstream first” philosophy, and we dedicate our expertise and resources to fundamental projects such as Xen, while supporting contributors of all levels in joining us on this journey.

On 8/19/2026