Senior .NET Developer
RebTel Networks AB · Stockholm · Tills vidare
RebTel Networks AB is hiring a **Senior .NET Developer** based in Stockholm to help design, develop, and deploy complex, high-throughput backend services and APIs. The position focuses on establishing long-term technical roadmaps for backend systems, planning for growth, and resolving technical debt. Responsibilities include writing clean, testable code for critical components, adopting modern technologies, and influencing standards across teams for testing, performance tuning, and security. The role also involves **mentoring engineers** and collaborating across the organization to drive consensus on critical architectural decisions. Candidates must demonstrate proven proficiency in the .NET ecosystem, including **extensive experience with C#**, .NET Core/5+, and related frameworks such as ASP.NET Core and Entity Framework Core. The role requires proven architecture skills in large-scale distributed systems, such as microservices or event-driven architectures, along with expert knowledge of design patterns, domain-driven design, and SOLID principles. Applicants must have extensive experience with at least one major cloud platform—AWS, Azure, or GCP—as well as a deep understanding of SQL and NoSQL database technologies. Excellent communication skills in English are necessary to present complex technical concepts to diverse stakeholders.
What will you do?
As a Senior .NET Developer who not only loves solving complex problems but is passionate about code quality, and building scalable and testable solutions.
You’ll be adequately self going, contribute to technical discussions, and aspire to deliver clean, robust code. You have a sharp eye for simplicity amidst complexity and pride yourself on thorough, thoughtful development, including writing tests for critical components. Whether working closely within your team or leading a project area independently, you’re confident, collaborative, and proactive.
Areas of ownership:
- Take part the design, development, and deployment of complex, high-throughput backend services and APIs, ensuring best-in-class performance and maintainability.
- Establish and articulate a clear, ambitious long-term vision and technical roadmap for the evolution of the BE systems.
- This includes planning for future growth, anticipating technological shifts, and driving the adoption of new technologies and patterns to maintain a competitive edge.
- Proactively identify and resolve technical debt before they impact the business.
- Mentor engineers, elevating the technical expertise and quality of engineering output across the organization.
- Influence engineering standards and best practices for testing, performance tuning, and security across different development teams.
Requirements
- Exceptional and proven proficiency in the .NET area, including extensive experience with C#, .NET Core/5+, and related frameworks (e.g., ASP. NET Core, Entity Framework Core).
- Demonstrable architecting skills with a strong background in designing and implementing large-scale, distributed systems (e.g., microservices, event-driven architectures, serverless).
- Expert knowledge of design patterns, domain-driven design (DDD), and SOLID principles.
- Extensive experience with at least one major cloud platform (AWS, Azure, or GCP) and related services (e.g., managed databases, message queues, containerization).
- Deep understanding of various database technologies (SQL and NoSQL) and data modeling best practices for scalable applications.
- System-Level Thinking: Ability to decompose complex problems into manageable components and evaluate trade-offs between different technical solutions (e.g., speed vs. stability, buy vs. build).
- Excellent verbal and written communication skills, with the ability to present complex technical ideas clearly to both technical and non-technical stakeholders, driving consensus on critical architectural decisions.
Why Rebtel?
Rebtel has been connecting people across borders for nearly 20 years. Today, we’re profitable, growing, and at a pivotal moment in our journey. As we enter our next phase, we’re building an organisation designed for speed, ownership, and real impact, where every role contributes directly to shaping what comes next.
This is a place with global ambition and a strong foundation, where ideas move quickly and decisions matter. You won’t get lost in layers of process or slow-moving structures. Instead, you’ll find the space to take ownership, collaborate across teams, and make meaningful contributions from day one. Based in Stockholm, we bring together a diverse, international team united by a shared purpose: to simplify the way people connect worldwide.
At Rebtel, you are the most important asset and we strive to provide a comprehensive package of benefits and perks that enhance your well-being and work experience. Here are some of the things you can expect from us:
- Pension Plan
- Health Checkups, Influenza shots and Private Medical Insurance
- Dental Insurance
- Occupational insurance
- Wellness allowance (5,000 SEK)
- Discount on gym memberships
- Bonus program
- Extra parental pay
- 30 days annual vacation
- Monday breakfasts
- Relocation Support, if you're joining us from afar, we'll assist you in making a smooth transition.
We are Rebtel. We come from all around the world to create products for anyone who has crossed a border. We believe in equal opportunity and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.