Senior Backend Engineer: Java, Cloud & FinTech Impact

Tipico Shop Agency North; Wien; On-site; EUR 72,000 - 88,000; Full time

Benefits offered by this job

Competitive salary

International group

Career development

Team events

Corporate benefits

One team culture

Job summary

5G Systems, based in Vienna, seeks a SeniorBackend Developer (m/f/x) to design high-performing Java services and contribute to both new technology stacks and legacy systems. You will participate in production deployments, document architectures, and mentor teammates.

The role emphasizes cloud-first development with AWS/Azure, strong database and architecture skills, and a problem-solving mindset to deliver robust, scalable back-end solutions for a leading gaming and payments ecosystem.

Qualifications

• Bachelor’s or Master’s degree and at least 5 years of professional software development experience.
• Experience with processing money transactions within Casino, Sportsbook or FinTech environments.
• Experience with fault-tolerant architectures with strong data consistency and idempotency guarantees.
• Strong development skills in Java 18-25 or .NET, and building scalable systems.
• Cloud-first environment with AWS or Azure experience.
• Strong database fundamentals with performance tuning and indexing strategies.
• MongoDB knowledge; ClickHouse or analytical SQL is a plus.
• Containerisation and virtualization knowledge.
• Basic Linux knowledge.
• Good English communication.
• Quality-focused and problem-solving mindset.

Responsibilities

• Design high-performing Java-based services in a complex system landscape.
• Contribute to new technology stack and maintain legacy systems.
• Lead software projects from draft to production.
• Document software architectures and share know-how.
• Coach and develop junior team members.
• Engage in code reviews to improve quality.

Skills

Java / .NET

Cloud AWS/Azure

MongoDB

Containers

Linux basics

English

Problem-solving

Quality mindset

Architecture design

Education

Bachelor’s or Master’s degree in Computer Science or related

Tools

MongoDB

ClickHouse

Job description

5G Systems, based in Vienna, seeks a SeniorBackend Developer (m/f/x) to design high-performing Java services and contribute to both new technology stacks and legacy systems. You will participate in production deployments, document architectures, and mentor teammates.

The role emphasizes cloud-first development with AWS/Azure, strong database and architecture skills, and a problem-solving mindset to deliver robust, scalable back-end solutions for a leading gaming and payments ecosystem.