Senior Software Engineer Java (m/f/d)

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Become Senior Software Engineer Java (m/f/d) 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 who specialises in company-wide cross-cutting topics and acts as a technical expert for cross-thematic software components. In this role, you will develop core services and frameworks used across all development teams. You will collaborate closely with cross-functional teams to continuously enhance our platform and deliver high-performance, scalable, and efficient solutions. Your deep expertise in various software architectures will contribute to driving technical excellence throughout the organization. This role can be carried out either in a hybrid model at our Munich Headquarter or fully remotely, assuming residency in Leipzig.

Key responsibilities:

• Take ownership of the entire software development lifecycle, from requirements analysis and architecture to design, implementation, and deployment
• Analyze, evolve, and transform existing design patterns
• Design of composite high-level APIs to standardise these services for customers
• Selection and introduction of suitable patterns for complex business processes
• Collaborate closely with Quality and Operations Engineers to ensure the highest software standards
• Perform root cause analysis and performance tuning to identify and resolve bottlenecks

What you'll need

• At least 5 years of professional experience in Java development (Java 11+)
• Sound knowledge of Spring Framework (Boot, Security, Cloud)
• Expertise in microservices architectures and event-driven design
• Extensive experience in CI/CD pipelines, Docker and Kubernetes and Linux environments
• Knowledge of database design (SQL/NoSQL: PostgreSQL, Redis)
• Experience in developing and maintaining centralized authorization services (OAuth 2.0, OpenID Connect, JWT)
• Proficiency with message brokers (Apache Kafka, ActiveMQ Artemis)
• Skilled in API design and management (OpenAPI, Swagger, Postman)
• Familiarity with monitoring and observability tools (Prometheus, Grafana, ELK Stack)
• Experience with build tools (Maven, Gradle) and version control (Git)
• Scripting skills (Bash, Python) for automation tasks
• Very good written and spoken German and English skills

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!