Senior .Net Developer
- Campus Sofia
- Senior
- Expertise: Technology
- Skills:
- Employment: Employed
- What you'll do
- Your qualities and skills as Senior .Net Developer
- What’s in it for you
- Get to know iO
- What your colleagues say
- Your application, step by step
What you'll do
As a .NET Developer at iO, you will help build .NET software solutions. You will contribute to the development, implementation, and optimization of concrete .NET (web) applications for high-impact projects. With your skills, you will ensure that hundreds of thousands of users have an optimal experience.
You will develop algorithms and APIs in C# in an extensive and versatile web landscape. You will integrate with external systems and technical layers.
You will not be doing this alone. As part of a cross-campus team of five developers, you will contribute to the further development of a data platform for a progressive building materials company that operates worldwide. You will find satisfaction in mentoring and training less experienced developers, while having plenty of room to develop your own talents and ambitions. You will work with colleagues from Belgium, Bulgaria and other iO countries.
Together, you will be responsible for the entire process, working closely with each customer, and inspiring each other to continue to grow and improve.
Of course, you have experience as a .NET Developer. But we also find it even more important to know who you are. Sharing your knowledge and experience with your colleagues? We'd love that! Together, you inspire each other to go the extra mile.
Your qualities and skills as Senior .Net Developer
You have a bachelor's or master's degree in IT and at least 4 years of relevant work experience. Experience working in a digital agency is a plus.
You are strong in ASP.NET (Core) and know how to develop and maintain REST APIs. You closely follow the latest developments of the .NET ecosystem.
You feel at home in a complex .NET landscape with APIs, long-running processes, data ingestion and transformation, where you can fully utilize your expertise. Working with events and asynchronous data processing is child's play for you.
You are familiar with cloud services such as AWS and Azure, and have experience with components such as Azure Functions, App Services, Key Vault, Service Bus, and more. Git and Docker hold no secrets for you, and setting up CI/CD pipelines is also one of your skills.
You have experience setting up high-performance search solutions that use Elasticsearch.
You also have experience with Application Insights, telemetry, and monitoring and tracking logging, so you not only build applications, but also proactively optimize them.
You know how to test, refine, and take existing .NET applications to the next level. Performance, unit testing, and integration testing are second nature to you.
You feel at home in an agile environment: you contribute ideas about technical analyses, solution design, and workload estimates. You take responsibility, communicate clearly, and actively contribute to the team's success.
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- #LI-Hybrid
What’s in it for you
26 days of vacation days
Based on a 40-hour work week, you have 26 days of paid leave.
Additional health and dental insurance
Covering patient and outpatient care, health and dental care, reimbursement of costs for prescribed medicines, pregnancy and birth coverage.
Hybrid working
A good work-life balance is super important. Together with your team, you’ll decide when and where you work.
Healthy office snacks and specialty coffee
At our campus, we provide fresh fruits, healthy snacks and specialty coffee beverages throughout the day.
Personal training budget
Each year, you’ll get a budget of €3,000 to develop yourself, in your profession or as a person, through training, events, or courses.
Celebrating together
If there’s something to celebrate, we know how to party! From time to time, the party team at your campus will organise the best (theme) parties.
Get to know iO
- 2,000+colleagues
- 13campuses
- 5countries
- 26nationalities
- 10+awards in the past year
- ∞growing, learning and challenging yourself
What your colleagues say

Your application, step by step
Working together, making an impact and growing: it all starts with the right connection. That's why we'd like to get to know you and want you to get to know your future colleagues too.
FAQ
Apply now
Ready for an exciting career at iO? Apply using this form or through LinkedIn. We’ll contact you soon.