Mid/Senior .NET Developer

Join a small but highly skilled team working on a large-scale, business-critical platform with thousands of daily users. We’re looking for .NET developers (medior or senior) who are primarily backend-focused but open to occasionally touching frontend or Java components as well. The system is complex (around 30 components), mostly .NET-based, with some legacy Java and JavaScript parts, and it runs fully in AWS cloud. English is the working language.

Responsibilities

• Develop and maintain backend services in a microservice architecture (.NET, MS SQL)

• Debug, optimize, and extend existing components for performance and scalability

• Occasionally contribute to frontend or legacy modules (JavaScript, React, Java)

• Ensure smooth integrations with web and mobile platforms (React Native, Android)

• Collaborate with the product owner, scrum master, and a small international dev/test team

• Follow agile (Kanban) processes with continuous delivery and regular demos

Requirements

• Strong experience with .NET development (C#)

• Solid knowledge of JavaScript (and openness to React)

• Hands-on experience with microservices

• Database expertise (MS SQL Server, SQL optimization)

• Strong debugging and problem-solving skills

• Solid English (spoken and written) for daily collaboration

Nice to Have

• Java experience (especially working with legacy code)

• Familiarity with React or React Native

• DevOps affinity (Jenkins, Ansible, AWS)

• Experience working in complex, large-scale systems

Why You’ll Love Working With Us

🥷 BlackBelt team – Join a smart and skilled team where everyone’s a tech BlackBelt
🧠 Growth-oriented – We support your development with training and certifications
👣 Variety – Work on a complex, multi-component system with constant challenges
😮 WOW program – Our Wellbeing Office Way supports your health and balance
🛋️ Flexibility – The role is full remote
🧡 Caring culture – We’ve got your back during challenges, both personal and professional