Junior Software Engineer - Backend (Java) (m/f/x)
MannheimHybridFull-time
AI Summary
Assists in designing and developing Java-based enterprise backend software for the osapiens HUB platform, collaborating in an agile team to deliver scalable, high-quality solutions.
About this role
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.
Key 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
Skills, Knowledge & Expertise
- 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
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
Automated TestingCassandraDistributed SystemsElasticsearchGitJavaJavaEENoSQLOpenSearchREST APISOAPSpringSQL
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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.
