Senior Backend Developer

Senior Software Engineer - Backend (.NET, BFF, SDUI & GraphQL) - ContractJoin a leading enterprise as a Senior Backend Software Engineer to design and implement a critical Backend-for-Frontend (BFF) solution and implement Server-Driven UI (SDUI) for mobile applications. We are seeking a highly specialized contributor who is proficient in the .NET framework, GraphQL, and modern CI/CD practices. This role involves deep collaboration with a cross-functional app team in a hybrid environment. If you excel in architecting robust, scalable backend solutions, this contract is for you.Key Responsibilities & FocusThe successful candidate will be a hands-on technical engineer, responsible for developing, maintaining, and enhancing the core backend architecture.Design, develop, and maintain a Backend-for-Frontend (BFF) solution using the .NET framework.Implement and manage Server-Driven UI (SDUI) capabilities tailored for mobile applications.Work extensively with GraphQL (specifically Apollo GraphQL and Module Federation) to manage data and third-party service integration.Manage the software development lifecycle using Azure DevOps and GitHub.Develop and maintain robust CI/CD pipelines.Ensure high code quality and security through tools like SonarQube and other security practices.Collaborate effectively with a cross-functional application team on integrated solutions.What You'll BringPlatform Proficiency: Strong, proven proficiency in the .NET framework is required.SDUI/BFF Experience: Commercial experience with Server-Driven UI (SDUI) development for mobile apps and a strong background in BFF architecture/design.GraphQL Expertise: Deep expertise in working with GraphQL (Apollo GraphQL, Module Federation).DevOps & Git: Solid understanding of Git fundamentals and practical experience with CI/CD pipelines using Azure DevOps and GitHub.Code Quality: Experience using code security and quality tools like SonarQube.Beneficial Skills:Knowledge of cloud infrastructure (AWS, Azure).Familiarity with observability (Dynatrace) and third-party services (Contentful, CommerceTools, Algolia).Experience with Hot Chocolate GraphQL server and security tools (Orca, Snyk).Experience with AI developer tools (GitHub Copilot) and mentorship/pair-programming.Location & EngagementLocation: Central Auckland, New Zealand (Hybrid)Start Date: January 2026Engagement: Initial 6 months contract with a chance of extensionApply NowIf you are a proven Senior Backend Software Engineer specializing in the .NET framework, BFF, SDUI, and GraphQL and are ready to contribute immediately, apply now or contact Amaan for more details: amaan.kazmi@randstaddigital.co.nz.At Randstad, we are passionate about providing equal employment opportunities and embracing diversity to the benefit of all. We actively encourage applications from any background.Experience5 yearsSkillsNET Framework,Server-Driven UI (SDUI), GraphQL (Apollo/Module Fed.), Backend-for-Frontend (BFF), Azure DevOps/GitHub, CI/CD, SonarQube/Security Tools, Collaboration Software Dev LifecycleQualificationsBachelor DegreeeducationBachelor Degree&ICT