Senior Backend Developer / Software Test Engineer

Zpark Energy Systems AB; Luleå kommun; On-site; SEK 45,000 - 60,000; Full time

Job summary

A leading energy technology company in Luleå, Sweden, seeks an experienced backend developer with strong test engineering skills. In this role, you will design, develop, and maintain backend services primarily using Go, while implementing automated tests and working closely with other engineering teams. Candidates should have a minimum of 5 years' experience and strong communication abilities in English, with proficiency in Swedish being a plus. This position involves collaborative work to enhance software reliability and performance.

Qualifications

• Minimum of 5 years experience in backend development or test engineering.
• Experience with Go preferred; other backend languages accepted.
• Strong communication skills in English; Swedish a plus.

Responsibilities

• Design, develop, and maintain backend services using Go.
• Implement automated test frameworks and validation processes.
• Define and implement test strategies for various testing types.
• Build tools to verify distributed system reliability and performance.
• Collaborate with cross-functional teams for high-quality solutions.

Skills

Backend development

Test engineering

Go

RESTful API design

Linux-based systems

Databases (PostgreSQL, Cassandra)

Version control (Git)

Concurrent programming

Asynchronous programming

English communication

Job description

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.