Java Full Stack Developer

Location: Vienna (1–2 days on-site per week during onboarding, then 2-4 day per month; otherwise fully remote) Start: ASAP | Duration: 12 months (extension possible) | Workload: 100% Language: English (must-have) + German (nice to have)

We are seeking an experienced Java Full Stack Developer with a strong focus on backend development to join our agile team. Your role will involve designing and developing APIs, implementing microservice-based architectures, integrating with databases, and contributing to frontend development using JavaScript/TypeScript with React or Angular. You will collaborate closely with cross-functional teams in an agile environment.

Experience in the telecommunications sector is a strong plus.€350 - €400 a dayKey Responsibilities

Design, develop, and maintain backend services using Java, Spring, and Spring BootImplement and integrate REST APIs for internal and external systemsConduct unit testing using JUnit to ensure code qualityManage builds and dependencies with MavenWork with PostgreSQL, ideally including JSONBDesign and develop scalable, maintainable microservice architecturesCollaborate closely with product owners, architects, developers, and DevOps teamsContribute to the continuous improvement of development processes and toolsEnsure solutions meet performance, stability, and security standardsContribute to the frontend using JavaScript/TypeScript and React or AngularWork with technologies from the Apache ecosystem where applicable (e.g. for services, integration, or tooling)

Required Skills & ExperienceProven professional experience in backend development with Java (Java 21 preferred)Strong knowledge of Spring and Spring BootExperience with REST API development and integrationProficiency in JUnit for unit testingExperience in Maven build managementSolid knowledge of PostgreSQL (JSONB is a plus)Strong background in microservice architecture design and implementationExperience with frontend development using JavaScript/TypeScript and React or AngularFamiliarity with Apache-based technologies in a typical Java backend stackAgile mindset and experience working in Scrum/Kanban teamsExcellent command of English (spoken & written)

Nice to HaveKubernetes & Helm for deployment and orchestrationSOAP service integration experienceExperience with Graylog for logging and monitoringTelecommunications industry knowledge (big plus)Knowledge of Kafka , ApacheWhy Join Us?Work on impactful, enterprise-grade solutionsAgile, collaborative work environment with international teamsOpportunity to influence architecture and technology decisionsEngagement in a technically demanding, modern Java backend / Fullstack environmentInterested? Please send your updated CV including availability and hourly rate expectations. We look forward to hearing from you! Please contact me by email at elena.kahraman@qualysoft.com, or via LinkedIn.

Thank you for your understanding! +43 699 14402417We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans.

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