Senior Full-stack Developer (C# & React)

We’re hiring across Europe: Senior Full-stack Developer (C# & React)
Vienna (on-site)
Visa sponsorship available
✅ Full-time

At Novasign, we’re redefining the future of bioprocessing. Our platform, Novasign Studio, combines intelligent hybrid models, automation, and modern microservices (SOA) architecture to accelerate the development of life-saving therapies, next-generation enzymes, and sustainable food technologies.

We’re scaling fast with a growing customer base across biotech and life sciences. If you’re looking to make a real-world impact with cutting-edge machine learning and SaaS technology, we want to hear from you. We're hiring ten new team members in the next four months, and this role is critical in driving our growth.

Role Summary

We seek a senior C#/ASP.NET full-stack developer with deep React and TypeScript expertise to design and build robust, scalable gRPC and REST APIs for Novasign Studio. You will work on core systems, focusing on high-performance APIs, real-time SignalR applications, and modern React interfaces, while applying strong OOP and Domain-Driven Design principles and collaborating with our software engineering and consulting teams to deliver high-quality, maintainable solutions.

Responsibilities

• Design and implement microservices and APIs using C#/ASP.NET Core, gRPC, REST, and SignalR
• Build TypeScript/React (Next.js) interfaces and real-time features (SignalR, WebSockets)
• Apply OOP, SOLID, DDD, modular design, and composition principles
• Collaborate in Agile/Scrum teams, participate in code reviews, and contribute to architectural documentation

Requirements

• Bachelor’s/Master’s in Computer Science, Software Engineering, or related field
• Deep knowledge and experience in C# & ASP.NET Core, OOP, LINQ, DDD
• Deep knowledge and experience in React and TypeScript
• gRPC, Protocol Buffers, REST, SignalR, WebSockets
• SQL/EF Core, Docker, Ubuntu (WSL2), CI/CD pipelines
• Authentication (OAuth2/OIDC, JWT), API documentation (Swagger/OpenAPI), Git workflows
• Testing: xUnit, Jest, React-Testing-Library; unit, integration, functional
• Microservices architecture, SOA, Event-Driven Architecture (RabbitMQ, Kafka)
• CSS frameworks (Material UI, Bootstrap, Tailwind)
• Excellent English communication
• Nice to have experience with Kubernetes and tools like Tilt, Kubectl, K9s and AWS EKS
• Nice to have previous experience with Python
• Nice to have hands-on experience with Identity Providers, OAuth, SAML2, OIDC

Benefits

• Innovation Culture: We are an international team. We value new ideas, open discussions, and constructive criticism. Your voice shapes our technological direction
• Professional Growth: Continuous learning opportunities and career development in cutting-edge software
• Meaningful Impact: Work on software that accelerates life-saving therapies, enzyme manufacturing and sustainable food production
• Competitive Package: We offer an attractive salary above industry standards, complemented by comprehensive benefits, including a free food allowance. In accordance with the IT collective agreement (minimum ST1 – Regelstufe), the minimum gross annual salary is €53,802; however, your actual compensation will reflect your skills, experience, and impact and will be significantly higher
• Full time (38,5 h/week) – 25 days of paid holidays per full calendar year