Senior Software Engineer (m/w/d) - Python & Email Security

Become Senior Software Engineer (m/w/d) - Python & Email Security 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
• Public transportation, lunch subsidy and further benefits

What you'll do

Retarus protects the email communications of companies around the world. Our Email Security team develops and operates the platform behind it: filtering spam, malware, and fraudulent emails across large volumes of email traffic while ensuring high availability across multiple data centers worldwide. Over the years, the platform has evolved. Some services run on Kubernetes, others on traditional Linux hosts, and certain components are ready for the next generation.

As a Senior Software Engineer, you take ownership of your own services, primarily developed in Python and partly in Java. You contribute your technical expertise to decisions about the further development and modernization of our platform. You tackle technical debt step by step with a long-term perspective. You keep track of your responsibilities and see initiatives through to completion. Through thorough code reviews and your way of working, you set an example for other developers and support their professional development.

Key Resonsibilities

• Take ownership of selected services within our Email Security platform, particularly regarding architecture, implementation, quality, and operational stability
• Analyze and further develop existing services while identifying opportunities for modernization, consolidation, and decommissioning
• Identify, prioritize, and gradually reduce technical debt in close collaboration with the Product Owner, while ensuring uninterrupted platform operations
• Ensure high development standards through thorough code reviews, automated testing, and adherence to shared engineering best practices
• Provide technical guidance and support to other developers, fostering individual ownership and technical expertise within the team
• Collaborate closely with Operations and other product teams on rollouts, production incidents, and troubleshooting, turning insights into sustainable technical improvements

What you'll need

• At least 5 years of professional software development experience and strong expertise in Python
• Experience modernizing and evolving established software systems incrementally while maintaining continuous production operations
• Experience mentoring and supporting other developers, as well as conducting constructive and thorough code reviews
• Solid knowledge of Linux, Docker, and CI/CD, along with hands-on experience with Kubernetes
• Experience analyzing and resolving production incidents and collaborating closely with Operations teams
• Very good English skills and good German 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: [email protected]

We’re

looking forward to getting to know you!