Become Senior Software Engineer (m/f/d) - Java at Retarus. Retarus is a worldwide provider of cloud-based messaging solutions at enterprise scale. We serve over 40% of the companies listed on the S&P Global 100, e.g. Adidas, Bayer, SAP, BNP Paribas, Goldman Sachs, T-Systems, Swarovski & UPS, as well as governmental agencies and major players in markets across the world. Privately owned and founder-managed for over thirty years, Retarus is customer-oriented, stable, a fair employer, and a strategic business partner with a long-term vision. With some 500 employees in 19 offices on four continents, Retarus operates locally and thinks globally: our teams are organized across borders and are highly integrated. This makes Retarus a multicultural, multilingual, and engaging workplace. We are committed to creating a diverse and dynamic environment for our employees, with generous compensation, time off, and a global, collaborative workplace. What we offer Mobile working and flexible working time Collaborative, diverse company culture and superior team spirit Flat hierarchies and great feedback culture Development opportunities & career perspective International business & cross-site collaboration Modern, dog-friendly offices with nice amenities Company-paid health insurance, public transportation, lunch vouchers and further benefits What you'll do We are looking for an experienced Senior Software Engineer with a focus on Java to join our agile development team and contribute to the creation of innovative communication solutions. Our globally distributed, high-performance, and highly reliable services enable secure and seamless transaction-based communication for our clients. In this role, you will work on the further development and optimization of our backend systems, with a strong focus on performance, security, and scalability. You’ll collaborate closely with cross-functional teams to continuously enhance our platform and deliver powerful, efficient solutions. Your technical expertise will help improve software quality and implement best development practices. Key Responsibilities: Take ownership of the full software development lifecycle — from requirements analysis and architecture to design, implementation, and deployment Analyze, enhance, and integrate existing software solutions Develop high-performance, event-driven, and secure software solutions in Java Collaborate closely with Quality and Operations Engineers to ensure the highest software standards Automate and improve CI/CD pipelines to streamline development and deployment processes Perform root cause analysis and performance tuning to identify and eliminate bottlenecks What you'll need Extensive experience in software development with Java Strong knowledge of common Java frameworks and libraries Deep expertise in API design, RESTful services, messaging systems, and stream processing Proven experience developing and monitoring globally distributed, highly reliable systems handling large volumes of data and messages Practical experience with CI/CD pipelines, Docker, Kubernetes, and Linux environments Familiarity with cloud applications and microservice architectures Solid understanding of agile methodologies and a mindset for continuous improvement Proactive and adaptable working style, with the ability to take on responsibilities across different areas of the software stack Openness to new technologies and challenges What you can expect At Retarus, you will work on impactful and dynamic projects, with real opportunities to make a difference. Our customers are leaders across diverse industries, with constantly evolving needs and high expectations. You’ll be working with cutting-edge technology and great creative leeway to meet customers’ needs – and the projects you work on will be deployed globally. Working at Retarus, you will collaborate closely with convivial, culturally diverse teammates. You will grow professionally in a dynamic and exciting workplace and design impactful solutions in real time with top companies. Very important Come as you are. Retarus is committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or veteran status. Apply via our online application portal – it’s easy and doesn’t take long. Our colleague Alissa Selman is happy to field any questions you may have: Alissa.Selman@retarus.de We’re looking forward to getting to know you!