Senior Backend Developer
Sectoralarmspain
Posted: December 19, 2025
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Job Description
🚀 Join Sector Alarm as a Senior Backend Developer!
📍 Location: Spain (Fuengirola/Malaga - Madrid) or Norway (Oslo) - hybrid role
📢 Department: Tech
Role Overview: Your Day-to-Day
As a Senior Backend Engineer you will play a critical role in designing and developing backend systems that support IoT devices, leveraging modern DevOps practices. You will work with cutting-edge technologies in Azure cloud infrastructure and a microservices architecture, building solutions that protect the lives and homes of our customers. This is a permanent, full-time position reporting to the Engineering Manager.
Since 2019, we have been undergoing a digital transformation—placing technology and data at the heart of our strategy. This role is a crucial part of that journey, where innovation and customer experience drive our success. To learn more about our Tech organization click here.
Key responsibilities
• Strengthening and supporting the development team, building software that helps to protect the lives and homes of our customers
• Writing clean, scalable code using C# .NET Core
• Writing code and develop according to business and user needs
• Evaluating new code for reliable architecture, stability, reusability, performance, automation, security and metrics
• Remaining up to date with the terminology, concepts, and best practices for coding
• Writing unit and integration tests to cover functionality and reduce regressions
• Mentoring junior developers and new team members
• Coordinating with product owners, developers and architects
• Solving complex development problems and technical challenges - through innovative approaches and problem solving
What we're looking for
• Relevant BSc or MSc is preferred, applicable senior experience may compensate for lack of formal background
• 5-7 years of experience as a Backend Developer
• Strong proficiency in C# and .NET Core.
• Thorough experience with microservices and APIs (REST and event-based)
• Azure experience with managing WebAPIs, containers, and web applications.
• Comfortable with Agile methodologies
• Experience with SQL and no SQL
• Skilled in automation and integration testing.
• Fast ability to learn new systems and software value chains
• Excellent verbal and written English skills
• You must identify yourself with our core values; willing to improve, goal oriented, customer focused and reliable
• A valid work permit in the EU
Nice-to-Haves
• DevOps and Terraform
• Expertise with CI/CD and test automation
• Previous IoT experience
Benefits of working at Sector Alarm Tech
• Work within a European setup with product presence across 8 countries and opportunities for expansion.
• Primary IT hub located in Oslo, secondary hub in Fuengirola, Spain, with opportunities for travel.
• Access to training, certifications, and continuous learning opportunities.
• Significant autonomy in the role, encouraging initiative and innovation without micromanagement.
• Agile work environment using Kanban/ScrumBan/Scrum methodologies tailored to what works best for the team.
• Competitive compensation and benefits package, including informal social gatherings and a collaborative company culture.
About the recruitment process
We will recruit on a rolling basis, so please do not hesitate to apply with a CV in English. A criminal record check will be requested for the successful candidate.
🔥 Ready to make an impact? See what our employees in Tech say about the culture at Sector Alarm: