Junior Software Engineer - Backend (Java) (m/f/x)
Software Engineering
Mannheim, Germany
Posted on Sep 23, 2026
We are seeking Junior Java Developers to support the ongoing development and enhancement of our osapiens HUB. You will play a key role in ensuring the delivery of high-quality, scalable solutions that empower our platform. Join us in pushing the boundaries of innovation and making a significant impact on our enterprise-grade application development platform.
The osapiens HUB is a cloud-based platform that helps businesses manage their sustainability, compliance, and transparency efforts more easily. The HUB offers ready-made software solutions that automate compliance with environmental and social regulations, helping businesses track and improve sustainability with minimal manual effort. It’s user-friendly, adaptable, and optimizes existing resources.
Think of it as an all-in-one toolkit for businesses looking to operate more sustainably while keeping up with legal requirements without getting bogged down in technical or administrative hassles.
This role is based in Mannheim, a vibrant tech hub at the heart of Germany, where you'll collaborate with a talented, forward-thinking team. We embrace a hybrid work model, with three days a week in the office, ensuring the perfect balance between in-person collaboration and remote flexibility.
- Abteilung
- osapiens Hub
- Beschäftigungsart
- Festanstellung
- Standort
- Mannheim
- Arbeitsplatztyp
- Hybrid
Your Responsibilities
- Assist in the design and development of Java-based enterprise software, with a focus on backend systems
- Participate in developing Java services and components to support our software solutions
- Collaborate in an agile team setting, learning from senior developers and growing your technical and professional skills
Your Experience
- Foundational knowledge of Java or JavaEE, with a willingness to learn Spring
- Basic understanding of databases; experience with SQL or NoSQL databases like Cassandra is a plus
- Familiarity with web services development or integration (REST, SOAP, etc.)
- Interest in learning and applying automated testing principles
- Exposure to distributed systems (knowledge of distributed systems is a plus)
- An interest in OpenSearch, ElasticSearch, or similar technologies
- Familiarity with version control systems, especially Git
- A collaborative, agile mindset, and eagerness to learn
Join us for this and more...
- 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
Über osapiens
Bei osapiens vereinen wir mehr als 550 talentierte Köpfe mit einer gemeinsamen Mission: nachhaltiges Wachstum für Unternehmen weltweit zu ermöglichen. Gegründet im Jahr 2018 und mit Hauptsitz in Mannheim, Deutschland, sowie weiteren Standorten in Europa und den USA, haben wir die KI-gestützte osapiens HUB Plattform aufgebaut.
Diese Plattform umfasst derzeit 26 Enterprise-Lösungen, die auf unserer eigenen Multi-Tenant-Infrastruktur laufen – entwickelt für unternehmensübergreifende Zusammenarbeit und Automatisierung. Mit skalierbaren, sofort einsatzbereiten Lösungen ermöglichen wir eine schnelle Implementierung für Unternehmen jeder Größe, vom Großkonzern bis zum Mittelstand und über alle Branchen hinweg.
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