{"id":2981003,"url":"https://alion.io/job/mastercard-lead-software-engineer-connectivity","title":"Lead Software Engineer — Connectivity","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":86,"open_postings":170,"ghost_share":0.024,"stale_share":0.435,"repost_share":0.082,"time_to_fill_p50_days":26,"computed_at":"2026-10-23T05:54:15Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland","Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":72000,"max_usd":118000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":57},"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Copilot","optional":false},{"name":".NET","optional":true},{"name":"Amazon S3","optional":true},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"C#","optional":true},{"name":"CI/CD","optional":true},{"name":"Java","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Redis","optional":true},{"name":"Spring Boot","optional":true}],"status":"live","first_seen_at":"2026-10-20T00:00:00Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-23T23:28:52Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"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\nLead Software Engineer - ConnectivityOverviewThis role sits within Mastercard’s Open Finance Europe - Connectivity team, building and operating scalable API connectivity to financial institutions across Europe.\nAs a Lead Software Engineer, you will own end-to-end delivery of secure, reliable connectivity services. This is a hands-on role focused on solving complex problems, driving technical decisions, and delivering high-quality systems from design through production.\nYou will partner with Product and business stakeholders to deliver new capabilities, improve platform reliability, and scale integrations across markets.\nCore Responsibilities\nOwn end-to-end delivery of engineering solutions-from design through development, deployment, and production support\nSolve complex technical problems and drive system design decisions\nDesign, build, and operate scalable APIs and backend services\nReview code and uphold high standards of quality, performance, and maintainability\nApply best practices across SDLC, testing, security, and observability\nCollaborate with Product, Architecture, Security, and SRE teams\nImplement robust testing strategies (unit, integration, end-to-end)\nDrive automation and improvements in developer productivity and operational efficiency\nMentor engineers and support them in solving technical challenges and growing their skills\nTechnology Stack\nC#, .NET 10, Web APIs\nJava/Spring Boot (plus)\nAzure (App Services, Blob Storage, KeyVault, CI/CD)\nAWS (Microservices, S3, Redis, CI/CD pipelines)\nPostgreSQL, Flyway\nGenerative AI tools (GitHub Copilot, etc.)\nAll About You\nMust Have\n8-10 years of professional software engineering experience\nStrong hands-on experience building cloud-based, highly available systems\nDeep expertise in backend engineering (API design, reliability, production support)\nProven ability to solve complex technical problems and influence design decisions\nExperience delivering and operating end-to-end systems in production environments\nStrong collaboration skills with Product and business stakeholders\nFamiliarity with banking/payments/open banking (PSD2) environments\nStrong communication and problem-solving skills\nNice to Have\nExperience with Open Banking or bank connectivity at scale\nExperience with AI-assisted engineering tools (Copilot, etc.)\nTrack record of improving efficiency through automation\n• Familiarity with infrastructure-as-code and platform governance\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, and\n\nComplete all periodic mandatory security trainings in accordance with Mastercard’s 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