Senior .NET Developer

Rebtel; Stockholms kommun; On-site; SEK 800,000 - 1,100,000; Full time

Benefits offered by this job

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

Job summary

Rebtel in Stockholm is seeking a Senior .NET Developer who loves solving complex problems and delivering high‑quality, scalable back‑end services.

You will design and implement distributed systems, mentor engineers, and contribute to the technical roadmap, while collaborating across teams to raise engineering standards and security.

This role offers the chance to own meaningful architecture decisions from day one and to shape how we connect people across borders.

Qualifications

• Proven proficiency in C#/.NET and ASP.NET Core with EF Core.
• Experience designing and implementing large-scale distributed systems (microservices, event-driven, serverless).
• Strong knowledge of design patterns, domain-driven design (DDD), and SOLID principles.
• Extensive experience with at least one cloud platform (AWS, Azure, or GCP) and related services.
• Deep understanding of SQL and NoSQL databases and data modeling for scalability.
• Ability to decompose complex problems and evaluate trade-offs for speed vs. stability.

Responsibilities

• Take part in design, development, and deployment of high-throughput backend services and APIs.
• Establish a long-term technical vision and roadmap for BE systems evolution.
• Drive adoption of new technologies and patterns to maintain competitive edge.
• Identify and resolve technical debt proactively.
• Mentor engineers and elevate engineering quality across the org.
• Influence testing, performance tuning, and security standards across teams.

Skills

C# / .NET

ASP.NET Core

EF Core

Microservices

DDD / SOLID

Cloud platforms

SQL / NoSQL

Tools

None

Job description

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.