osapiens

Senior Java Backend Engineer

osapiens

full-time

Posted on:

Location Type: Hybrid

Location: Mannheim • Germany

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Job Level

Senior

Tech Stack

CassandraDistributed SystemsElasticSearchGraphQLJavaNoSQLSpring

About the role

  • Build Scalable Systems: Design and develop reliable backend systems using Java and modern technologies to power the osapiens HUB.
  • Develop Core Logic: Implement business logic for enterprise-grade solutions and solve complex real-world challenges.
  • Integrate Platforms: Build and maintain RESTful and GraphQL services that support seamless integrations and client needs.
  • Collaborate End-to-End: Work with engineers, product managers, and designers to deliver integrated, high-quality solutions.
  • Mentor & Elevate Quality: Support junior engineers and promote best practices in coding, testing, and backend development.

Requirements

  • Passion for Scalable Systems: You’re motivated by building distributed, high-performance backend systems that create real-world impact.
  • Java & Spring Expertise: Strong experience with Java/JavaEE and Spring Framework, with deep knowledge of scalable backend architectures.
  • Database & API Skills: Familiarity with NoSQL databases (e.g., Cassandra, ScyllaDB) and strong experience designing RESTful and GraphQL APIs.
  • Quality & Reliability: Proficiency in automated testing, CI/CD practices, and building fault-tolerant distributed systems.
  • Modern Engineering Toolkit: Experience with OpenSearch or Elasticsearch, solid Git skills, an agile mindset, and exposure to DevOps practices.
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
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
JavaJavaEESpring FrameworkNoSQL databasesCassandraScyllaDBRESTful APIsGraphQL APIsautomated testingCI/CD
Soft Skills
collaborationmentoringproblem-solvingquality assurancecommunication