{"id":3450339,"url":"https://alion.io/job/mastercard-senior-software-engineer-89","title":"Senior Software Engineer","company":{"id":252,"name":"Mastercard","domain":"mastercard.com","url":"https://alion.io/company/mastercard","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":87,"open_postings":174,"ghost_share":0.017,"stale_share":0.437,"repost_share":0.069,"time_to_fill_p50_days":27,"computed_at":"2026-10-30T05:48:23Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Oslo, Norway"],"countries":["NO"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2026-10-29T10:38:13Z","employer_posted_date":"2026-10-29","last_verified_at":"2026-10-30T20:26:55Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Our Purpose\nMastercard 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.\nTitle and Summary\nSenior Software EngineerOverviewAs 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.\nYou will contribute to technical direction, influence architectural decisions, and drive engineering excellence across systems, processes, and practices.\nYou will collaborate closely with product, engineering, and operations teams to solve complex challenges, ensure high quality delivery, and support reliable production systems.\nIn this role, you will:\nDesign, develop, and maintain scalable and reliable software solutions aligned with business needs\nContribute to architecture and technical design decisions across systems and services\nWrite high-quality, maintainable, and well-tested code\nPerform code reviews and ensure adherence to engineering standards and best practices\nLead or actively contribute to planning, prioritization, and backlog management\nTroubleshoot and resolve complex technical issues across systems and environments\nEnsure high levels of quality through testing strategies (unit, integration, performance, etc.)\nCollaborate with cross-functional stakeholders (product, architecture, operations) to deliver end-to-end solutions\nDrive continuous improvement of development practices, tools, and processes\nMentor and guide junior engineers, fostering a culture of learning and collaboration\nWe are looking for someone who:\nHas strong experience in software development across modern technologies and architectures\nDemonstrates solid understanding of system design, APIs, and scalable distributed systems\nWrites clean, efficient, and well-tested code, with strong debugging and problem-solving skills\nHas experience with test strategies and quality practices across the SDLC\nIs comfortable working in complex, multi-tiered systems and production environments\nCommunicates clearly and effectively across technical and non-technical stakeholders\nShows ownership, accountability, and a drive to deliver high-quality outcomes\nIs proactive in identifying improvements and driving change\nEnjoys mentoring others and contributing to a strong engineering culture\n• Thrives in a collaborative and agile environment\nCorporate Security Responsibility\nAll 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:\nAbide by Mastercard’s security policies and practices;\n\nEnsure the confidentiality and integrity of the information being accessed;\n\nReport any suspected information security violation or breach, 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