Junior Software Engineer - Backend (Java) (m/f/x)

Company: osapiens
Location: Mannheim, Baden-Württemberg
Type: hybrid
Posted: Sep 22, 2026
Views: 1
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

  • 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

  • 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

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Name: osapiens
Website: https://osapiens.com

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