Senior .NET Backend Developer (f/m/d)

Greentube GmbH; Wien; Hybrid; EUR 52.000 - 64.000; Vollzeit

Benefits dieser Stelle

Hybrid work model

Training budget

Vienna HQ office

Public transport subsidy

Company events

Zusammenfassung

Greentube GmbH in Vienna seeks a Senior .NET Backend Developer to transform game ideas into scalable backend systems for social casino games, from real-time gameplay to data pipelines.

You will work with REST, GraphQL and WebSocket APIs, design distributed systems, and contribute to the Vue.js Admin Panel. The role combines backend engineering with modern DevOps practices in a hybrid setup.

Qualifikationen

• Experience with .NET technologies; .NET 5+ preferred.
• Strong knowledge of SQL and NoSQL databases.
• Familiarity with REST, GraphQL and WebSockets APIs.
• Experience with Docker, Kubernetes and cloud-native tech.
• Understanding distributed systems that support millions of players.
• Experience building event-driven systems via Kafka, RabbitMQ and Azure Service Bus.
• Strong product thinking and ability to turn stakeholder needs into technical requirements.
• Collaborative mindset with agile approach and English communication.

Aufgaben

• Turn technical discussions and stakeholder feedback into clear, actionable requirements and practical solutions.
• Explore, evaluate, and manage libraries and tools to choose the right solution for each project.
• Design and build optimised distributed backend systems and real-time gaming features for high concurrency.
• Create and optimise databases and ETL pipelines for reliability and performance.
• Bring new features to life in our Vue.js Admin Panel by implementing their configuration.
• Create and maintain automated and performance tests for reliability under pressure.
• Develop and maintain Vue.js Test-Client features to ease backend testing.
• Build and maintain CI/CD pipelines and rollback strategies; collaborate with frontend teams.

Jobbeschreibung

At Funstage, our players come first. The Backend team creates the technology behind our social casino games, from bonus engines and progression systems to leaderboards, battle passes and real-time gameplay that keep players coming back for another round.

As a Senior .NET Backend Developer, this is a chance to turn great game ideas into reality, tackle exciting challenges at scale, and see your work make a real difference to the player experience. From idea to production, there’s plenty of room to shape how things are built, bring fresh ideas to the table, and have fun solving tricky technical problems along the way.

Your tasks

Analyse

• Turn technical discussions and stakeholder feedback, including insights from Customer Support and CRM, into clear, actionable requirements and practical solutions
• Explore, evaluate, and manage libraries and tools that help the team choose the right solution for each project

Develop

• Design and build optimised distributed backend systems and real-time gaming features capable of handling hundreds of thousands of operations per second and up to 50.000 simultaneous players
• Create and optimise databases and ETL pipelines to keep data reliable and systems performing at their best
• Bring new features to life in our Vue.js Admin Panel by implementing their configuration

Test

• Create and maintain automated and performance tests that keep features reliable under pressure
• Develop and maintain Vue.js Test-Client features that make backend features easy to test and validate

Deploy

• Build and maintain CI/CD pipelines and fast, reliable rollback strategies
• Work with web and mobile frontend teams to integrate backend services seamlessly across their platforms

Maintain

• Build and continuously improve Kubernetes infrastructure and monitoring across Azure and local development environments
• Maintain security protocols covering user roles, access controls, encryption, and security updates
• Document incidents from root cause through resolution and post-mortem analysis, turning issues into opportunities to improve
• Share your expertise with your colleagues and improve the overall team quality

Tools

• Technologies: .NET 10, Vue.js, GraphQL via Hasura, WebSockets via SignalR, PostgreSQL, Cassandra, Redis, OpenTelemetry, and Identity Server

The Team

• Architecture is a team effort. New solutions are discussed openly and shaped together, with team buy-in before development begins
• Code reviews are part of how we grow. Every pull request is reviewed by the rest of the team within a few hours, helping us maintain quality while sharing knowledge along the way
• We work as peers. The manager is part of the team, and technical decisions are discussed openly and made together
• Choose what you build. Features aren’t simply assigned, team members can choose which features they want to work on from the sprint
• Quality comes built in. Unit tests and Gherkin-based acceptance tests are part of our definition of done and are kept up to date
• Keep it simple. We follow the YAGNI principle, avoiding unnecessary complexity and focusing on solid, evolvable architectures
• Own the full picture. Everyone builds a strong understanding of our Kubernetes components and CI/CD, so infrastructure knowledge is shared across the team

Your profile

• Professional experience working with .NET technologies, with .NET 5+ experience preferred
• Strong knowledge of database technologies, with experience across SQL and NoSQL preferred
• Familiarity with the API technologies that connect our backend to frontend experiences, including REST, GraphQL, and WebSockets
• Familiarity with Docker, Kubernetes, and cloud-native technologies
• Understanding of distributed systems and the challenges of building technology capable of supporting millions of players worldwide
• Capable of building event-driven systems using message buses like Kafka, RabbitMQ, and Azure Service Bus
• Strong product thinking, with the ability to turn stakeholder needs into clear and effective technical requirements
• Collaborative mindset with experience in pair programming, team workshops, knowledge sharing, and supporting the growth of others
• Agile mindset and a pragmatic approach to building solid, evolvable solutions
  Confident communicating and collaborating in English, both written and spoken

Our offer

We believe great work happens when people feel supported, inspired, and balanced. By investing in our employees, we create an environment where everyone can thrive and reach their full potential. This commitment has been recognized through our Great Place to Work certification. We offer the following benefits:

• Flexible working hours and a hybrid model that fit your lifestyle, backed by a strong culture of work-life balance
• A dedicated training budget to explore new skills, deepen your expertise, and shape your career journey
• A welcoming office atmosphere at our Vienna HQ with daily fresh fruit, a wide range of teas, fair-trade coffee, and meals at our company-subsidized restaurant
• Subsidized public transportation, plus access to pool e-bikes and e-cars — for both business and personal use
• Plenty of ways to stay active and connected, from MyClubs app points to regular sports and company events
• Attractive local employee discounts and healthcare benefits that make everyday life a little easier
• The minimum gross annual salary for this position according to the applicable collective agreement is €58,000 (full-time basis). A higher salary is possible depending on qualifications and experience

About Greentube

Greentube GmbH, the global interactive unit of NOVOMATIC, is a leading developer and supplier of iGaming solutions. Greentube is a wholly-owned subsidiary of the NOVOMATIC Group, one of the biggest producers and operators of gaming technologies and one of the largest integrated gaming companies in the world. Greentube’s industry leading omni-channel technology allows the convergence of online, mobile and land-based games. The well-diversified product portfolio includes Classic Slots, Table Games, Live Dealer Gaming, AWP Reloaded Slots, Server-Base Gaming, Social Casino Gaming, Bingo and more.Greentube GmbH
Wiedner Hauptstraße 94, 1050 Wien
www.greentube.com