Senior Backend Developer / Software Test Engineer

You will play a key role in designing, developing, and validating our backend system. You will work closely with our software and firmware teams to develop reliable, scalable backend services with a strong focus on quality, testing, and automation. Your experience in backend development and test engineering will be important in shaping and improving our platform.

What you will do:

• Design, develop, and maintain backend services and systems using Go and the Twelve-Factor App methodology.

• Design, develop, and maintain automated test frameworks, test environments, and validation processes for backend systems and services.

• Define and implement test strategies covering functionality, integration, system, regression, and performance testing.

• Build tools and test harnesses to verify the reliability, scalability, and correctness of distributed systems.

• Optimize software for performance, efficiency, reliability, and scalability.

• Troubleshoot, debug, and analyze applications and test results to ensure smooth functionality.

• Collaborate with front-end developers, firmware engineers, and other stakeholders to deliver high-quality software solutions.

• Participate in code reviews and provide constructive feedback to team members.

Your Profile

• Minimum of 5 years of experience in backend development, test engineering, or a similar role.

• Experience with Go is a strong advantage. We also welcome candidates with solid backend experience in other typed backend languages.

• Experience designing and implementing CI-based test execution for backend systems and distributed applications.

• Experience and familiarity with concurrent and asynchronous programming.

• Proven experience with RESTful API design, implementation, and testing.

• Strong familiarity with Linux-based IT systems and test or hosting environments.

• Knowledge of databases (PostgreSQL, Cassandra) and expertise with in-memory caching solutions (Redis or comparable).

• Experience with distributed event-streaming and messaging systems, such as Apache Kafka or NATS.

• Experience working with version control systems (Git) in collaborative environments.

• Excellent problem-solving skills and attention to detail, with the ability to make sound trade-offs based on business needs and technical requirements.

• Ability to work independently and as part of a team.

• You communicate clearly and are comfortable supporting and mentoring less experienced developers.

• Strong communication skills in English, written and spoken. Proficiency in Swedish is a plus.