Senior Software Engineer - Nexthink - Lausanne, Switzerland

We are seeking a passionate and experienced Backend Engineer with a strong track record of designing and implementing scalable, reliable, and high-performance backend systems. As part of one of our AI teams, you will be responsible for building and evolving the core services and infrastructure that power our AI-driven products. This role involves architecting and delivering backend solutions that handle large-scale data processing, real-time interactions, and integration with multiple services. You will work closely with product, infrastructure, and frontend teams to ensure that our systems are robust, efficient, and capable of supporting rapid product growth. Because the position is cross-functional, the ability to communicate complex technical concepts in a clear and pragmatic way is essential. You will thrive in a collaborative environment where your work directly enables innovative, production-ready AI-powered experiences at scale. Responsibilities * Design, build, and scale distributed backend systems that serve millions of users. * Drive end-to-end delivery of features: from design, implementation, deployment, and monitoring. * Architect real-time, low-latency APIs and backend services for AI-driven conversational systems. * Develop cloud-native services in Java, ensuring reliability, performance, and scalability. * Work on infrastructure components, including AWS-based deployments, containerization (Docker), and orchestration (Kubernetes/ECS). * Build robust APIs and backend services that power AI-driven products and real-time interactions. * Ensure resiliency, fault tolerance, and compliance in high-throughput environments. * Collaborate with product managers, infrastructure engineers, and other teams to deliver production-ready systems. * Contribute to technical discussions, share knowledge, and help evolve best practices in backend and infra engineering. Qualifications * BSc/BEng or Masters in Computer Science (or equivalent) * 5+ years of professional backend engineering experience * Proficient in at least one of those Java (17+) * Proven experience designing and scaling backend systems for millions of users or high-throughput real-time services. * Solid understanding of cloud-native architectures (AWS or similar), containerization (Docker), and orchestration (Kubernetes/ECS). * Strong background in high availability systems, failover, and resiliency design. * Curious mindset with an eagerness to learn and adapt * Excellent knowledge of observability practices: logging, monitoring, tracing, metrics. * Strong communication skills in English, able to explain complex technical topics clearly. Nice to have * Java frameworks knowledge (Micronaut, Spring). * Python experience * Experience with distributed data systems (e.g., Redis, Apache Kafka). * Exposure to LLM integration (prompting, evaluation, observability). * Performance tuning and scaling experience in high-throughput environments. * Familiarity with GitOps, CI/CD, IaC 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.