Full-Stack Data Scientist

Company 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
Job Description
We are seeking a Full Stack Data Scientist to join our world-class AI team. This is a unique opportunity to work at the forefront of the industry, shaping the intelligence behind our next-generation AI services. You will dive deep into the complex behaviors of advanced chatbots and agentic threads, developing the algorithms and tools that drive our AI's evolution.
In this role, you won't just analyze data; you will bridge the gap between research and production. You will tackle undefined challenges in conversational AI, turn theoretical papers into live improvements, and build the tools that empower us to understand our models better than anyone else. If you are passionate about pushing the boundaries of what AI agents can do and want to see your work directly impact millions of users, this is the place for you.
Responsibilities

• Develop sophisticated algorithms and internal tools to dissect chat logs and agent threads for millions of users, uncovering hidden performance gaps and opportunities for breakthrough improvements.

• Execute end-to-end data science projects, adopting an iterative, scientific approach to solve real-world challenges in agentic AI.

• Assess the true impact of implemented changes on user experience and system performance through rigorous, statistically sound evaluation. Contribute to our benchmarking initiatives.

• Define complex, open-ended problems clearly, translating high-level business goals into concrete, data-driven engineering objectives.

• Analyze massive datasets to decode the "why" behind AI behavior, identifying patterns that others miss.

• Evaluate and experiment with cutting-edge solutions and architectural approaches, rigorously weighing trade-offs to find the optimal path forward.

• Justify technical decisions and model choices with solid evidence, influencing the strategic direction of our AI product.

• Collaborate with top-tier product managers, engineers, and designers to understand constraints and co-create the future of our AI platform.

• Conduct deep literature reviews to stay ahead of the curve in ML and NLP, rapidly translating state-of-the-art research into practical, production-grade implementations.

• Create compelling data visualizations and dashboards that tell the story of our AI's performance, driving clarity and alignment across the team.

• Work effectively within a cross-functional team, contributing to a culture of technical excellence, collaboration, and continuous innovation.

Qualifications

• BSc/MSc in Computer Science, Data Science, Mathematics, or a related field.

• Strong critical thinking and problem-solving skills, with a relentless drive to deliver practical, high-impact results.

• Deep proficiency in Python and its data science ecosystem (pandas, scikit-learn, numpy, etc.).

• Solid understanding of standard machine learning algorithms and statistical methods, with the intuition to know which tool fits the problem.

• Experience delivering data science projects end-to-end, from raw data collection and exploration to building robust tools or deploying models.

• Ability to read academic literature and implement complex research concepts into working code.

• Strong communication skills, with the ability to explain complex data concepts to diverse stakeholders.

• Experience with modern data visualization tools (e.g., matplotlib, seaborn, plotly) or BI platforms.

• Fluent in English (spoken and written).

Nice to have

• Hands-on experience with LLMs and modern NLP techniques (Prompt Engineering, RAG, Chain-of-Thought).

• Experience working with advanced chatbots, conversational AI, or autonomous agentic systems.

• Familiarity with cloud-native environments (AWS) and containerization (Docker).

• Knowledge of MLOps best practices, ensuring reproducibility, automated evaluation, and seamless model lifecycle management.

If you're excited about pushing the boundaries of AI and mentoring the next generation of engineers, we'd love to hear from you! Even if you don't meet every requirement, we encourage you to apply-we value expertise, passion, and the drive to learn.
Additional Information
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.
• Beautiful office, conveniently located next to the Prilly-Malley train station
• 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) plus 3 company-paid volunteer days.
• Free access to a fitness centre inside the building.
• Reimbursement of the half-fare travel card for public transport.
• ‍ Reimbursement up to 50% of the cost of French classes.
• Fresh fruit, cookies, and soft drinks as well.
• Regular company and team events like Voluntary Days, Pizza talks, Team Building activities, hosting Meetups at the office and more!
• Bonuses for referring successful hires after three months of continuous employment.
• We offer a relocation package to people who are coming from another country.

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.