Java Full Stack Developer

Location

Vienna (1–2 days on-site per week during onboarding, then 2-4 days 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 day

Key Responsibilities

Design, develop, and maintain backend services using

Java ,

Spring , and

Spring Boot

Implement and integrate

REST APIs for internal and external systems

Conduct unit testing using

JUnit to ensure code quality

Manage builds and dependencies with

Maven

Work with

PostgreSQL , ideally including

JSONB

Design and develop scalable, maintainable microservice architectures

Collaborate closely with product owners, architects, developers, and DevOps teams

Contribute to the continuous improvement of development processes and tools

Ensure solutions meet performance, stability, and security standards

Contribute to the frontend using

JavaScript/TypeScript and

React or Angular

Work with technologies from the

Apache ecosystem where applicable (e.g. for services, integration, or tooling)

Required Skills & Experience

Proven professional experience in backend development with

Java

( Java 21

preferred)

Strong knowledge of

Spring and

Spring Boot

Experience with

REST API development and integration

Proficiency in

JUnit for unit testing

Experience in

Maven build management

Solid knowledge of

PostgreSQL

( JSONB is a plus)

Strong background in microservice architecture design and implementation

Experience with frontend development using

JavaScript/TypeScript and

React or Angular

Familiarity with

Apache -based technologies in a typical Java backend stack

Agile mindset and experience working in

Scrum/Kanban teams

Excellent command of

English

(spoken & written)

Nice to Have

Kubernetes

&

Helm for deployment and orchestration

SOAP service integration experience

Experience with

Graylog for logging and monitoring

Telecommunications industry knowledge (big plus)

Knowledge of

Kafka

, Apache

Work on impactful,

enterprise-grade solutions

Agile,

collaborative work environment with international teams

Opportunity to influence architecture and technology decisions

Engagement in a technically demanding, modern

Java backend / Fullstack environment

Interested?

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 14402417