Medior​/Senior Front-End Developer (.net core

Introduction

At Yellowtail Conclusion, we develop software that strengthens digital security in one of the most digitized countries in the world: the Netherlands. One of our flagship products,
Key Control Dashboard (KCD), enables organizations to manage risks effectively through smart, user-friendly technology.

To keep innovating, we’re looking for a Medior Front-End Developer who enjoys working with front-end technologies. You’ll join a passionate, highly skilled development team based entirely in the Netherlands, contributing to a great platform.

• Contribute to our UI transformation. We’re currently migrating our ASP.NET MVC application to .net core Application and front end. As a medior developer, you’ll play an important role in this transition—building new components, refining user flows, and helping shape a clean, maintainable front-end architecture alongside our lead engineer.
• Front-end focus, real impact. Your core responsibility will be developing and enhancing the new UI. You’ll work closely with backend developers, UX designers, and product owner to deliver a smooth and intuitive user experience.
• Innovative environment. We encourage learning and experimentation. Have an idea to improve performance or user interaction? We want to hear it—and help you test it.
• Growth and ownership. You’ll be trusted with real responsibility, contribute to technical decisions, and mentor junior developers as part of a collaborative team.

We truly value your talent and want to support your growth. At KCD, you will have ample learning opportunities and the freedom to discover your strengths.

• A relevant bachelor’s or master’s degree in Computer Science, Software Engineering, or a related field.
• 3–5 years of professional development experience.
• Strong experience with C# and UI / UX development and .net core.
• Somebody open and eager to learn new technologies like Blazor.
• A proactive mindset with strong communication skills in English (Dutch is an advantage).
• Team spirit: you enjoy collaboration, providing constructive feedback, and contributing to a dynamic team.
• Experience working within agile development teams and a solid track record of independently solving technical challenges.

• Front end: .net MVC, jQuery, optionally Blazor or Angular
• Back end: C#, ASP.NET
• Data & cloud: MS SQL Server, Azure
• Dev Ops: CI/CD pipelines, code reviews, automated testing

You’ll primarily work on the .net core mvc front end but have the opportunity to contribute across the stack if desired.

• Salary between €3400 and €5300 gross per month;
• €674,25 mobility budget per month (can be used for travel expenses or as additional salary);
• All essential matters well-organized: a high-speed laptop, phone, excellent pension plan, travel allowance, and daily lunches;
• Flexible working: largely choose where and when you work. We believe in maintaining a healthy work-life balance and support you in setting up a comfortable home office or even working remotely from your favorite vacation spot;
• A friendly, informal culture: we frequently organize activities such as company trips, hackathons, sports events, and more. Every other year, there’s either a major company trip or a large-scale hackathon;
• Room for personal growth: you will receive mentoring and coaching from senior developers, enabling you to quickly learn and advance.