Senior Software Engineer - Backend D/F/M

Personio's intelligent HR platform helps small and medium-sized organizations unlock the power of people by making complicated, time-consuming tasks simple and efficient. Our team of 1,500 Personios is building user-friendly products that delight our 15,000+ customers and their 1.5 million employees. Ready to make an impact from day one? The Role This role requires 2 days per week in the office and is based in Madrid. Join us to shape the future of software in the underserved and high-impact HR technology industry. Your work will have a direct and tangible impact on customers, offering ownership and the chance to make a meaningful difference. As we prepare for significant growth, you'll face exciting challenges and have the opportunity to influence our path toward becoming one of the world's leading tech companies. This role is ideal for a highly collaborative back-end engineer who thrives in a cross-functional environment and enjoys working deep in the backend services . As a Senior Back-End Engineer , you’ll help maintain and evolve Personio’s support experience while collaborating with designers, engineers, and product teams to build user-centric solutions. What You'll Do Build Reliable and Performant Solutions: Develop and enhance Personio’s implementation and support experiences , ensuring customers can successfully set up Personio and get support during their lifecycle. Build scalable and high-performance back-end features using Kotlin and Spring Boot in a Distributed Systems environment. Hands-On Development: Contribute to a high-output engineering team by actively coding and delivering impactful features. Our team embraces a culture of Pair/Mob programming, which we practice in a remote/hybrid setting. Write clean, maintainable, and scalable code that aligns with best practices. Focus primarily on the back-end stack (experience in Kotlin is a plus, but not required). Estimating, Scoping, and Planning: Own the estimation, scoping, and planning of projects, ensuring efficient execution. Work closely with Product Management and Leadership teams to define and drive strategic initiatives . Solve Complex Technical Challenges: Ensure the implementation and support experiences are highly available, performant, and secure . Improve operational quality by optimizing observability, monitoring, and incident response. Drive technical excellence by simplifying architecture and managing technical debt. Cross-Functional Collaboration: Work closely with Design System and Design teams to align UI components and experiences. Participate in the interviewing and hiring process to support the growth of the team. Engage in high levels of collaboration (approx. 50% pair programming and team meetings). Operational Leadership: Take ownership of on-call responsibilities , ensuring operational excellence across the implementation and support services . Proactively enhance engineering processes, incident management, and continuous improvements . What You Need to Succeed Technical Expertise: Strong back-end engineering experience (ideally with modern JVM languages like Kotlin or similar), working with distributed systems . Deep back-end development expertise (Kotlin experience is a plus). Experience working with modern engineering best practices , including testing strategies, observability, and security considerations . Operational Excellence: Demonstrated ability to maintain high-availability applications with a strong focus on performance and reliability . Experience with incident response and a proactive approach to continuous improvement . Leadership and Collaboration: Proven ability to mentor and coach engineers , fostering a culture of learning and growth . Strong communication skills , with the ability to build relationships across engineering and product teams . Comfortable working in a highly collaborative environment , engaging in pair programming and team discussions . Willingness to be on-call and take ownership of operational responsibilities . Why Personio? Personio is an equal opportunities employer, committed to building an integrative culture where everyone feels welcomed and supported. We embrace uniqueness and understand that our diverse, values-driven culture makes us stronger. We are proud to have an inclusive workplace environment that will foster your development no matter your gender, civil status, family status, sexual orientation, religion, age, disability, education level, or race. At Personio, we value in-person collaboration while also offering flexibility. This role is office-based, with 2 days per week required in your contracted office location. The remaining days can be worked from home or in the office if you prefer. In addition, you’ll have 20 Flex Days per year to work remotely from other locations. Aside from our people, culture, and mission, check out some of the other benefits that make Personio a great place to work: Receive a competitive reward package – reevaluated each year – that includes salary, benefits, and pre-IPO equity Enjoy 28 days of paid vacation, plus an additional day after 2 and 4 years Make an impact on the environment and society with 1 (fully paid) Impact Day Receive generous family leave, child support, mental health support (including 24 sessions per year with Oli for yourself and 10 sessions for a significant other), and sabbatical opportunities We enjoy gathering for meals, cultural initiatives, and events like local Summer Sessions and year-end celebrations. There's also healthy snacks, drinks, and a weekly catered lunch.