Senior Software Engineer - Java

Mastercard; Oslo; On-site; NOK 900,000 - 1,200,000; Full time

Job summary

Mastercard in Oslo seeks a Senior Software Engineer - Java to design, build, and evolve scalable software delivering real business value. You will influence architectural decisions and drive engineering excellence across systems and processes.

Collaborate with product, engineering, and operations teams to solve complex challenges, write high‑quality code, mentor engineers, and advance testing, CI/CD, and production reliability.

Qualifications

• Strong experience in software development across modern technologies and architectures.
• Solid understanding of system design, APIs, and scalable distributed systems.
• Experience with testing strategies across the SDLC and production environments.

Responsibilities

• Design, develop, and maintain scalable software solutions aligned with business needs.
• Contribute to architecture and technical design decisions across systems and services.
• Write high-quality, well-tested code and perform code reviews.
• Mentor junior engineers and drive engineering excellence.

Skills

Software development

System design

APIs

Distributed systems

Testing strategies

Agile

Job description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title And Summary

Senior Software Engineer - Java

Overview

As a Senior Software Engineer, you will play a key role in designing, building, and evolving resilient, scalable, and high quality software solutions that deliver real business value. You will contribute to technical direction, influence architectural decisions, and drive engineering excellence across systems, processes, and practices. You will collaborate closely with product, engineering, and operations teams to solve complex challenges, ensure high quality delivery, and support reliable production systems.

In This Role, You Will

• Design, develop, and maintain scalable and reliable software solutions aligned with business needs
• Contribute to architecture and technical design decisions across systems and services
• Write high-quality, maintainable, and well-tested code
• Perform code reviews and ensure adherence to engineering standards and best practices
• Lead or actively contribute to planning, prioritization, and backlog management
• Troubleshoot and resolve complex technical issues across systems and environments
• Ensure high levels of quality through testing strategies (unit, integration, performance, etc.)
• Collaborate with cross‑functional stakeholders (product, architecture, operations) to deliver end-to-end solutions
• Drive continuous improvement of development practices, tools, and processes
• Mentor and guide junior engineers, fostering a culture of learning and collaboration

All About You

• Has strong experience in software development across modern technologies and architectures
• Demonstrates solid understanding of system design, APIs, and scalable distributed systems
• Writes clean, efficient, and well-tested code, with strong debugging and problem‑solving skills
• Good understanding of account‑based payments and enabling schemes and integrations towards ERP systems
• Experience from fintech, open banking, bank APIs, ERP integrations or accounting software environments
• Has experience with test strategies and quality practices across the SDLC
• Is comfortable working in complex, multi‑tiered systems and production environments
• Communicates clearly and effectively across technical and non‑technical stakeholders
• Shows ownership, accountability, and a drive to deliver high‑quality outcomes
• Is proactive in identifying improvements and driving change
• Enjoys mentoring others and contributing to a strong engineering culture
• Thrives in a collaborative and agile environment

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard’s security policies and practices;
• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.