Principal Software Engineer

At Ketryx, we're on a mission to help medical software teams build secure, reliable applications that make a real difference in people's lives. We give them the tools to automate the tough parts of compliance and quality so they can focus on what matters most: creating life-saving products with confidence.

We are currently hiring an experienced Principal Software Engineer to join our team. In this role, you will help medical device companies bring their products to market more quickly. You will take ownership of features from start to finish, designing the architecture, writing the code, and overseeing everything through to production. Your work will have a direct impact on the future of healthcare technology.

This is a hybrid role in Vienna, with at least three days per week on-site.

What You'll Lead & Own

• Database Architecture & Optimization
• Own PostgreSQL as our core system of record—designing schemas, optimizing queries, managing indexing strategies, and ensuring the database remains performant and maintainable at scale.
• Lead efforts to profile, benchmark, and optimize the entire backend stack. Design services, APIs, and workflows for low latency, high throughput, and fault tolerance.
• Establish long-term standards for system design, migrations, documentation, testing, and monitoring. Ensure that as the platform grows, it remains easy to evolve, debug, and extend.
• Drive best practices for observability, incident response, and continuous improvement. Proactively reduce technical debt and enforce reliability as a first-class feature.
• Work closely with Product, Compliance, and Security to ensure system decisions align with regulatory needs—traceability, auditability, and safety are integral.
• Mentor and guide engineers across teams. Lead strategic initiatives that improve system performance and maintainability for years to come.