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Senior Backend Developer

Sectoralarmspain

Madrid, Madrid, Spain (ES - Customer Service Spain, ES - Madrid 1 (Head Quarter), NO - Oslo (HQ)) Hybrid permanent

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:

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