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osapiens

Java Backend Engineer

osapiens

Backend Engineer developing Java enterprise software for osapiens. Focused on scalable architecture and mentoring within an agile team environment.

Posted 6/2/2026full-timeMannheim • 🇩🇪 GermanyMid-LevelSeniorWebsite

Tech Stack

Tools & technologies
CassandraDistributed SystemsElasticSearchJavaMongoDBNoSQLPostgresSOAPSpringSpring BootSpringBoot

About the role

Key responsibilities & impact
  • - **Design & Develop**: Build and implement Java-based enterprise software with a strong focus on backend architecture and scalable system design.
  • - **Own Features**: Take full ownership of features from concept to delivery and ongoing support.
  • - **Shape Architecture**: Contribute to architectural decisions, technical discussions, and design planning in an agile environment.
  • - **Mentor & Review**: Support junior developers and conduct peer code reviews to uphold high-quality coding standards.
  • - **Collaborate & Grow**: Work closely within an agile development team, learning from senior engineers and continuously growing your technical and professional skill set.

Requirements

What you’ll need
  • - **Passion for Platform Engineering**: You’re excited about building scalable, distributed backend systems that create real-world impact for global companies.
  • - **Java Expertise**: Solid experience with Java or JavaEE, ideally with Spring or Spring Boot frameworks.
  • - **Database Skills**: Proficiency with relational and/or NoSQL databases such as PostgreSQL, MongoDB, or Cassandra.
  • - **API Development**: Strong experience building and integrating RESTful and/or SOAP web services.
  • - **Test Automation**: Experience implementing and maintaining automated tests (unit, integration, end-to-end).
  • - **Distributed Systems Knowledge**: Understanding of common challenges such as scalability, consistency, and availability.
  • - **Modern Engineering Practices**: Familiarity with Git and a collaborative, agile mindset.
  • - **Bonus Skills**: Hands-on experience with search and analytics engines like OpenSearch or Elasticsearch is a plus.

Benefits

Comp & perks
  • - A purpose-driven mission tackling complex sustainability challenges while working alongside global industry pioneers at a fast-growing unicorn company
  • - Room for creativity through collaborative teamwork and an open communication culture
  • - Flexibility and team bonding with our hybrid work options
  • - Fuel for your growth journey, both personally and professionally
  • - Sustainable mobility options, promoting eco-friendly commuting solutions
  • - Fun team events and outings with our global teams
  • - Inspiring workspaces in Mannheim and beyond

ATS Keywords

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Hard Skills & Tools
JavaJavaEESpringSpring BootPostgreSQLMongoDBCassandraRESTful servicesSOAP web servicesTest Automation
Soft Skills
ownershipmentoringpeer code reviewscollaborationagile mindsetcontinuous learning