Senior Software Engineer (.NET Integration)

Senior Software Engineer (.NET / Integration) Sydney or Melb | Hybrid (3 days in office) Build the integration platform behind one of Australia's largest technology businesses. Most backend engineering roles focus on delivering features. This one is about building the secure integration and API platforms that connect products, partners and customers at scale. You'll join a high-performing engineering team responsible for the services that power authentication, secure API access and system integrations across a large consumer technology platform. With major platform initiatives underway, you'll be working on complex backend engineering challenges involving distributed systems, cloud-native architecture and secure B2B integrations. If you've worked on Open Banking, Consumer Data Right (CDR), API platforms, developer portals or large-scale integration projects, this is the kind of environment you'll feel at home in. The Role This is a hands-on Senior Software Engineer position where you'll own medium-sized initiatives from design through to production. You'll work alongside experienced engineers building secure backend services, modern APIs and event-driven integrations, while helping shape engineering standards and mentoring other developers across the team. You'll Be Working On Designing and building scalable backend services using C# and .NETDeveloping secure APIs and integration platformsBuilding authentication and authorisation into customer and partner-facing servicesDelivering event-driven microservices in a cloud-native environmentImproving platform reliability, scalability and engineering qualityCollaborating with engineering teams across Australia and internationallyMentoring engineers through design reviews and technical coaching About You You'll be a strong backend engineer who enjoys solving complex integration problems and building secure, scalable platforms. Ideally you'll have experience with: C# / .NET 8+ and ASP.NET CoreAPI development and backend integrationOAuth2, OpenID Connect, JWT or modern authentication patternsMicroservices and distributed systemsAWS, Azure or GCPEvent-driven architectureStrong software design and architecture skills Experience in any of the following would be highly regarded: Open Banking or Consumer Data Right (CDR)API Platforms or Developer PortalsB2B integrationsIdentity and Access ManagementIdentity platforms such as Auth0, Cognito, Okta or Duende IdentityServerPublic-facing SaaS or consumer technology platforms Why Join? Work on large-scale, high-traffic backend platformsModern engineering environment using .NET, cloud and distributed architecturesComplex technical challenges with genuine architectural ownershipCollaborative engineering culture with strong technical leadershipClear progression into Staff, Principal or Technical Leadership pathwaysCompetitive salary, bonus and hybrid working If you're a Senior Backend Engineer who enjoys building secure integration platforms and solving complex distributed systems problems, we'd love to have a confidential conversation. Interested? Email Derek.mccormack@latitudeit.com.au