Junior Software Engineer - Backend (Java)

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., * 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, * 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

• 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

Founded in 2018 and headquartered in Mannheim, Germany, osapiens works with around 2,500 companies in over 50 countries across industries such as consumer goods, automotive, fashion, pharmaceuticals, and medical products. The company is backed by Goldman Sachs and Decarbonization Partners, reinforcing its commitment to responsible, sustainable growth and has reached unicorn status in January 2026.