Senior Java Engineer — Build scalable fintech systems

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

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.