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Senior Software Engineer (C++, OS internals)

Nexthink

Paris, IDF, France Hybrid permanent

Posted: February 27, 2026

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Quick Summary

We are seeking a Senior Software Engineer to join our team in Paris, France, and contribute to the development of our digital employee experience management software, focusing on OS internals and proactive optimization.

Job Description

Nexthink is the leader in digital employee experience management software. The company provides IT leaders with unprecedented insight allowing them to see, diagnose and fix issues at scale impacting employees anywhere, with any application or network, before employees notice the issue. As the first solution to allow IT to progress from reactive problem solving to proactive optimization, Nexthink enables its more than 1,300 customers to provide better digital experiences to more than 18 million employees. Dual headquartered in Lausanne, Switzerland and Boston, Massachusetts, Nexthink has 9 offices worldwide.

#LI-Hybrid

Inside the Nexthink Engineering department, the team you will be joining participates in building what we call the Collectors: the endpoint agents that run on the system of the millions of employees mentioned above. 

In a nutshell, Collectors extract meaningful information about the OS, interpret it, and feed it to our amazing data analytics systems. They also help remediate detected issues and improve users' device experience. Collectors are a complex and critical part of Nexthink products. They require the highest level of reliability and performance on each platform our Collectors currently run: Windows, macOS, and Linux. 

• Challenge #1: create comprehensive and reliable solutions 

• Challenge #2: do it for several platforms, using all the best from each platform 

• Challenge #3: keep solutions cross-platform where possible 

Our engineers are excited to take on broad non-conventional problems and can narrow them down to a relevant shape and function. They constantly come up with ideas to improve our product, they prototype them, then see them through in production and measure their impact. All of this with the very high standards of quality, performance and security that are part of our DNA. 

• 7+ years of experience in software development. 

• Very good demonstrable understanding of operating systems internals. 

• Experience in software development on Windows and/or macOS platforms close to OS level. 

• You are fluent in C++, preferably up to date with the latest standard iterations. 

• Proven experience leading or being an important contributor to one or more significant projects. 

• Consistently write concise and very well-tested code. 

• You can navigate and debug complex code using the tools available and have very strong attention to detail. 

• You can do OS-level research. 

• Experience in kernel-mode software development is an advantage. 

• Experience in multi-platform/cross-platform development, especially on Windows and macOS platforms, is also an advantage. 

• You enjoy working in a dynamic environment, and you are result-oriented. 

• You are a problem solver and like challenging tasks. 

• You communicate clearly and concisely in English. 

We are the pioneers and trailblazers of a global IT Market Category (DEX) that is shaping the future of how the world works, giving our customers’ IT Teams total digital visibility across their enterprise. Our innovative solutions integrate real-time analytics, automation, and employee feedback across all endpoints. This enables our IT teams to solve complex technical challenges, create ever more productive workplaces, and deliver happy, satisfied employees in the digital workplace.

With over 1000 employees across 5 continents, Nexthink operates as One Team, connecting, collaborating and innovating to continuously grow. We call our employees ‘Nexthinkers’ and our commitment to diversity, inclusion, and equity is second to none. We currently have over 75 nationalities working with us, from all cultures and backgrounds, speaking many different languages.

If you are looking for a change and like a nice atmosphere, lots of challenges, and having fun while working, this is a great opportunity for you! Check what we offer:

• 💼 Permanent Contract and a competitive compensation package. 
• 📍 Office location in 9m ARR, Rue de Caumartin. 
• 🩺 Health insurance employee-employer paid options covering medical, dental, and optical treatments, hospitalization, and equipment and 100% employer-paid life insurance. 
• 🏡 Hybrid work model balancing office and remote work, with a structured approach for new hires to foster connections and onboarding. 
• 🏖️ Flexible Hours and unlimited vacation (employees have unlimited paid time off on top of the 25 days of holidays we offer), RTT days, and 3 extra days for volunteering. 
• 📚 Free access to professional training platforms to explore your interests and enhance your skills. 
• 🚆 50% reimbursement on your Pass Navigo, making travel to and from work more affordable and sustainable. 
• 🍼 16 weeks of fully paid leave for primary caregivers, extendable up to 8 additional months unpaid, and 6 weeks of fully paid leave for secondary caregivers. 
• 🤸 Reimbursement for fitness, gym memberships, and sports participation up to 25 EUR/month. 
• 📣 Bonuses for referring successful hires after three months of continuous employment. 

Please note that not all the benefits listed above are available for temporary, contract, and internship roles. To ensure you have the most up-to-date information, we recommend checking with your Recruitment Partner

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