Senior Engineer – Java Applications

To strengthen our team, we are looking for an experienced Software Engineer (Senior Level) who works on complex Java applications with high precision, technical understanding, and a strong quality awareness. If you enjoy taking responsibility and want to actively shape demanding systems, you are exactly right with us.

Your tasks

• Development and implementation of sophisticated Java applications and systems as part of our development teams 
• Analysis, design, and continuous optimisation of software solutions in close collaboration with product management 
• Participation throughout the entire software lifecycle: from requirements analysis through design and implementation to testing and maintenance 
• Support of our customers and integration teams with new requirements, incidents, and service requests 
• Creation and maintenance of technical documentation 
• Close cooperation with interdisciplinary teams to ensure stable and high-performance software integration 
• Conducting code reviews as well as providing constructive feedback to ensure high code quality 
• You are very familiar with AI-supported development tools and use technologies such as Claude Code or AI-based code reviews
• Use of agile methods and modern tools for efficient and structured project implementation

Our offer

• You can expect a dynamic and interdisciplinary environment in which your commitment significantly contributes to the success of Sumex AG
• Key role in shaping a leading and established Swiss IT solution with a wide range of modules and services based on modern technologies
• Attractive prospects for your further professional and personal development
• Flat hierarchies and uncomplicated cross-departmental collaboration
• We organise regular events such as brown bag lunches and coding events as well as cosy and sporting off-site gatherings
• Good work-life balance (flexitime, home office), modern and flexible workplace in a multicultural environment
• Top benefits such as: purchase of up to 13 days’ holiday, contribution to private mobile phone or business phone, half-fare travelcard, business travel in 1st class, flexible pension schemes, coverage of daily sickness and accident insurance (private, worldwide), and much more

Your profile

• Bachelor’s degree in computer science, information technology, or a comparable field 
• At least 5 years of experience in the design, implementation, and maintenance of large Java applications 
• Sound knowledge of Java, Groovy, as well as common Java frameworks and libraries 
• Experience with relational database systems and SQL 
• Familiar with modern development tools and methods (e.g. Git, Maven, Jenkins, Docker) 
• Knowledge of PDF/Apache PDFBox as well as Eclipse RCP/OSGi is an advantage 
• You routinely use AI-supported development tools and understand how to integrate technologies such as Claude Code or AI-based code reviews into the software development process 
• Strong analytical thinking and problem-solving skills 
• Quick comprehension as well as a logical, customer- and product-oriented mindset 
• Independent, solution-oriented working style and high personal responsibility 
• Very good German and English skills (at least C1 level)

We rely on healthy values and are convinced that this is the key to success. Those who approach challenges with curiosity, motivation, and drive are exactly right with us! Let yourself be inspired by our motto: We make it work!

If you want to bring your enthusiasm for Java development into a technologically exciting environment and create real impact with your code, then we should get to know each other. We look forward to hearing from you!