Open since Jun 2026
Software Engineer - Backend (Java)osapiens · Mannheim
Software Engineer - Backend (Java)
MannheimHybrid
AI Summary
Design, develop, and maintain Java-based backend systems for a multi-tenant SaaS platform, including APIs, data processing engines, and integration services, while mentoring junior developers and contributing to architectural decisions.
About this role
About osapiens
At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.
At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.
Your Team
Our Backend Engineers (Hybrid in Mannheim · 3 days/week on-site) build the foundation of the osapiens HUB - the cloud platform powering all our SaaS products. The team develops engines for seamless monitoring, real-time data processing, centralized integration, automated workflows, and dynamic app development. Simply put: they build the core technologies that enable global companies to turn compliance into efficiency and sustainable growth.
Our Backend Engineers (Hybrid in Mannheim · 3 days/week on-site) build the foundation of the osapiens HUB - the cloud platform powering all our SaaS products. The team develops engines for seamless monitoring, real-time data processing, centralized integration, automated workflows, and dynamic app development. Simply put: they build the core technologies that enable global companies to turn compliance into efficiency and sustainable growth.
Key Responsibilities
- 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.
Skills, Knowledge & Expertise
- 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
- 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
Skills
CassandraDistributed SystemsElasticsearchGitJavaJUnitMicroservicesMongoDBOpenSearchPostgreSQLRESTful APISOAPSpring Boot
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All reports →- Role reportBackend engineer jobs, Sep 2026: new listings up 22.7% in a weekBackend engineer new listings rose 22.7% this week to 481, with 4,949 active roles. Senior positions make up over half. Apply early to new openings.
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- Market overviewState of tech hiring, September 2026: up 4.8%Tech hiring rose 4.8% month over month in September 2026, with 411,122 new listings. Customer support and account executive roles led the growth.