Full Stack Software Developer

Salary Competitive

Who We Are

VentriJect is a Danish health tech startup, spun out of Aalborg University. We've developed Seismofit®, an award-winning algorithm that uses AI to estimate fitness levels (VO₂max) in just three minutes, no exercise required.

We're a small, fast-moving team of 12+ people with customers across the EU and USA. In our Odder office, there are currently 2 of us, and we're looking to make that 3.

What You'll Be Doing

This is a full-stack developer role, and because we're small, you'll touch every layer of our software setup:

Frontend Development: Build and improve our app, written in Flutter, and our Web Portal in React.
Backend Development: Work on our C# backend.
Tooling: Write helper/automation scripts and tools where they're the right fit. Set up monitors and dashboards to track performance and usage of our systems.
Infrastructure & CI/CD: Work with our Azure setup (Blob Storage, Virtual Machines) and help maintain our CI/CD pipelines in Azure DevOps.
Regulatory-Grade Development: Because Seismofit® is operating in a regulated market, our software follows IEC 62304. You'll build with the rigor that requires documentation, traceability, and verification.

Let's be transparent: this isn't a role where you're handed a spec and left alone. Our hierarchy is flat, and you'll have real input into technical decisions and the direction of the software from day one.

You will get a lot of responsibility and shape the future for VentriJects APIs. Being a part of a smaller startup company means you will influence the company and help us grow.

What We're Looking For

The Experience Profile: 0–3 years of professional experience. We're not looking for a seasoned veteran; we're looking for someone hungry to grow and take ownership early.
Full Stack Comfort: You're genuinely interested in working across Flutter, C#, and Python, not just one corner of the stack.
AI-friendly: You know your way around AI (Claude) and use it as part of your daily programming.
Cloud & DevOps Familiarity: You have some experience with Azure and CI/CD; Azure DevOps specifically is a plus.
Technical Foundations: You're comfortable with Git and SQL, and you understand the logic behind your code rather than just copying snippets.
Regulatory Curiosity: You're comfortable working with, or willing to learn, medical device software regulations (IEC 62304). Prior exposure is a bonus, not a requirement.
Startup Mindset: You want to work somewhere small, where your voice matters and your work has a visible impact.
Communication: Excellent written and verbal English skills, as the company operates primarily in English.

For more information or questions please contact us at ks@ventriject.com

Perks and benefits

This job comes with several perks and benefits

Near public transit

Free office snacks

Remote work allowed

Flexible working hours

Free coffee / tea

Central office

Working at
VentriJect

See company profile

VentriJect is developing the groundbreaking Seismofit® System, a health solution that uses advanced seismocardiography and an AI algorithm to help healthcare and wellness providers assess cardiorespiratory fitness (CRF) accurately and efficiently, without physical exercise. Cardiorespiratory fitness (CRF), often measured by VO₂max, is a powerful predictor of long-term health and a key indicator of a person's risk for chronic diseases. Unfortunately, current methods for measuring VO₂max are often complex, time-consuming, and require a high-intensity physical effort (e.g., on a treadmill), which makes them inaccessible to many, especially the elderly, those with mobility issues, or patients recovering from illness. This widespread problem affects millions of people globally who could benefit from a simple, accurate, and non-invasive way to assess their fitness levels. We have developed the Seismofit® System, an award-winning medical device that revolutionizes CRF measurement. Our solution uses advanced seismocardiography—a technology that records the micro-vibrations of the chest caused by heartbeats—in combination with a sophisticated AI algorithm. In under three minutes, our system provides a highly accurate estimate of VO₂max without the need for any physical exercise. This fast, simple, and non-invasive process makes it possible for healthcare and wellness providers to easily integrate CRF assessments into routine check-ups, helping them provide more personalized care and better disease prevention strategies. The spark for VentriJect was ignited by a clear unmet need in the healthcare industry. We recognized that while VO₂max is a vital health metric, its assesment was limited to specialized settings due to the demanding nature of existing tests. This created a barrier to widespread adoption, preventing countless individuals from understanding and improving their cardiorespiratory health. Our team was motivated to bridge this gap by creating a technology that could democratize access to this critical health data. By making CRF assessments simple and accessible, we are not just building a product; we are empowering healthcare providers and patients to take a proactive approach to health, with the ultimate goal of improving quality of life for millions.