Backend Engineer - Kotlin (m/f/d) - German Market at voize (W22) €70K - €85K EUR We build the AI companion for nurses, to create time for care. Berlin, BE, DE / Berlin, Berlin, DE / Remote (DE) Full-time US citizenship/visa not required 3+ years About voize At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present. Today, that time is lost to admin work that pulls nurses away from what matters most: people. We’re changing that by building the AI companion that frees nurses from admin, giving them back up to 30% of time. We don’t replace humans - we support and amplify their impact. Today, 1,500+ care facilities trust voize, and over 100,000 nurses rely on our AI companion to ease their daily workload. Our mission is backed with a $50M Series A funding led by Balderton Capital, with support from HV Capital, Y Combinator and other leading VCs. As a fast-growing team, we combine first-in-class technology with meaningful social impact. And now, we’re looking for you to join us on this mission! About the role Skills: Kotlin 🎤 Why voize? Because we’re more than just a job! At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present. Today, that time is lost to admin work that pulls nurses away from what matters most: people. We’re changing that by building the AI companion that frees nurses from admin, giving them back up to 30% of time. We don’t replace humans - we support and amplify their impact. Today, 1,500+ care facilities trust voize, and over 100,000 nurses rely on our AI companion to ease their daily workload. Our mission is backed with a $50M Series A funding led by Balderton Capital, with support from HV Capital, Y Combinator and other leading VCs. As a fast-growing team, we combine first-in-class technology with meaningful social impact. And now, we’re looking for you to join us on this mission! 💡 Your Mission As a Backend Engineer for our German Market squad , you’ll ensure that data flows smoothly between our products and our partners' software solutions. You'll build and maintain the integrations that connect the voize with senior care and hospital software platforms. 🚀 Your Daily Business – No two days are alike Shape the future of our integrations – Develop interfaces that seamlessly connect voize with systems in the care and medical sector Build future-proof solutions – Develop a scalable API, set industry standards, and work closely with partners and clients Take end-to-end ownership – From the idea and implementation to the ongoing development of our integrations Architecture with foresight – Design thoughtful data models and sustainable solutions for complex systems Work with impact – Your work saves caregivers time, improves documentation, and supports people who do amazing work every day. 🤝 Your Skillset – What you bring to the table Several years of experience in backend development and API integration Proficiency with Kotlin and Coroutines is essential API design and development with REST or GraphQL Business fluent in German (C1) to communicate effectively with customers Open to travel to US occasionally 🌱 Growing together – what you can expect at voize We are a fast-growing startup, that means you will tackle challenges, grow quickly, and make a real impact, giving healthcare professionals more time for real patient care We foster an open, collaborative culture with regular team events, whether you work from our Berlin office or remotely from Germany Become a co-creator of our success with stock options Generous perks: 30 vacation days plus your birthday off, Germany Transport Ticket, Urban Sports Club, regular company off-sites, and access to learning platforms such as Blinkist and Audible You decide when you work best, that means flexible working hours and a good hybrid set-up. ✨ Ready to talk? Apply now! 🚀 We look forward to your application and can’t wait to meet you – no matter who you are or what background you have! Technology Tech Stack Android: Kotlin Multi-Platform, Jetpack Compose ML: PyTorch, Python Microservices: Kotlin, K8S Backend: Kotlin, Koin, REST API Challenges We run our ASR/NLP models locally on smartphones. Models need to be resource-efficient yet really accurate. With every user interaction data is generated and used for model improvements. This data needs to be processed continuously, automatically quality-assured and used for new model training. We deploy into production on average every 6h and release updated machine learning models several times a week.