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

osapiens; Mannheim; Hybrid; EUR 90.000 - 130.000; Vollzeit

Zusammenfassung

osapiens is seeking a Senior Software Engineer - Backend (Java) in Mannheim to join the osapiens HUB. You will design and implement scalable backend services powering our cloud platform for cross-company collaboration, automation, and compliance.

You will work in a Hybrid setup (3 days on-site in Mannheim) with a team building real-time data processing engines and centralized integration. The role demands deep Java/Spring experience and a passion for reliable, high-performance systems.

Qualifikationen

• Strong experience with Java/JavaEE and Spring Framework.
• Experience designing and building scalable backend systems.
• Familiarity with RESTful and GraphQL APIs.
• Experience with automated testing and CI/CD practices.
• Knowledge of OpenSearch/Elasticsearch and DevOps practices.

Aufgaben

• Build scalable backend systems using Java.
• Develop core business logic for enterprise-grade solutions.
• Build and maintain RESTful and GraphQL services.
• Collaborate with engineers, product managers, and designers to deliver integrated solutions.
• Mentor junior engineers and promote quality in coding and testing.

Kenntnisse

Java

Spring Framework

REST APIs

GraphQL APIs

NoSQL databases

CI/CD

Git

DevOps

Distributed systems

Mentoring

Tools

OpenSearch/Elasticsearch

Jobbeschreibung

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

Department: osapiens Hub

Employment Type: Permanent - Full Time

Location: Mannheim

Description

About osapiens

At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.

Your Team

Our Backend Engineers (Hybrid in Mannheim · 3 days/week on-site) build the foundation of the osapiens HUB - the cloud platform powering all our SaaS products. The team develops engines for seamless monitoring, real-time data processing, centralized integration, automated workflows, and dynamic app development. Simply put: they build the core technologies that enable global companies to turn compliance into efficiency and sustainable growth.

Your Key Responsibilities

• 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.

Your Experience

• 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.

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