Backend Java Engineer II — REST APIs for Payments

Mastercard Inc.; Oslo fylke; On-site; NOK 750,000 - 1,100,000; Full time

Job summary

Mastercard Inc. in Oslo is seeking a Software Engineer II - Java to contribute to continuous delivery of core payments services within Mastercard Payment Services for the Nordics.

You will work with a skilled team to refine requirements, maintain existing services and implement new features. You are self-driven, proactive, and curious, with strong Java backend experience, REST API development, and a customer-first approach.

Qualifications

• Experience in back-end Java development.
• Experience in developing and maintaining REST APIs.
• Customer-focused mindset with emphasis on quality and teamwork.

Responsibilities

• Drive functional requirements from specification to release.
• Design, develop, and maintain scalable Java-based services.
• Write high-quality, well-tested code.
• Deliver production-quality code using enterprise tools.
• Troubleshoot complex issues across systems and environments.
• Collaborate in an agile environment and document work in Jira/Confluence.
• Adhere to enterprise quality standards, processes and build control strategies.
• Work with business and development teams to define test plans and schedules.
• Leverage AI tools to boost productivity for relevant tasks.

Skills

Java

REST APIs

Backend development

Agile

Tools

Jira

Confluence

Job description

Mastercard Inc. in Oslo is seeking a Software Engineer II - Java to contribute to continuous delivery of core payments services within Mastercard Payment Services for the Nordics.

You will work with a skilled team to refine requirements, maintain existing services and implement new features. You are self-driven, proactive, and curious, with strong Java backend experience, REST API development, and a customer-first approach.