Senior Backend Developer - C# and .NET 10 (Remote, Contractual) [AS239]

About Smart Working At Smart Working, we believe your job should not only look right on paper but also feel right every day. This isn’t just another remote opportunity - it’s about finding where you truly belong, no matter where you are. From day one, you’re welcomed into a genuine community that values your growth and well-being. Our mission is simple: to break down geographic barriers and connect skilled professionals with outstanding global teams and products for full-time, long-term roles. We help you discover meaningful work with teams that invest in your success, where you’re empowered to grow personally and professionally. Join one of the highest-rated workplaces on Glassdoor and experience what it means to thrive in a truly remote-first world. About the Role We are looking for a Senior Backend Developer to join a collaborative product engineering team building and scaling a modern accommodation booking platform used by corporate travellers worldwide. This role is focused on developing and evolving scalable backend services and APIs using C# and .NET 10, helping power critical booking, quoting, integration, and search functionality across the platform. You will work closely with Product Managers, QA Engineers, Data teams, and other Engineers to deliver reliable, maintainable, and high-performing backend systems. The role involves a strong focus on API integrations, observability, CI/CD, and backend reliability in a fast-paced product environment.The team is currently focused on scaling and enhancing an internal accommodation booking engine, including:Accommodation search optimisation and advanced filteringAI-enhanced quoting and booking experiencesReal-time integrations with third-party systems for booking management and synchronisationPlatform scalability, observability, and reliability improvementsThis is a collaborative, backend-focused role suited to someone who enjoys solving complex integration and API challenges while contributing to engineering quality and platform evolution.ResponsibilitiesDesign, develop, and maintain scalable backend services and APIs using C# and .NET 10Build and maintain secure, reliable integrations with third-party systems and external APIsDefine and implement resilient and fault-tolerant API communication patternsTroubleshoot and resolve complex backend and API issues, including connectivity and data consistency problemsEnsure systems are observability-first through effective logging, metrics, monitoring, and alertingCreate and maintain clear API integration documentation for internal and external stakeholdersCollaborate closely with Product Managers, QA Engineers, Designers, and Data teams to deliver high-quality featuresChampion engineering best practices across testing, CI/CD, secure coding, and maintainabilityMentor junior developers and contribute to overall engineering excellenceSupport ongoing platform scalability, integration, and performance improvement initiativesContribute to the evolution of the company’s API platform and backend architectureRequirementsStrong proficiency in C# and .NET 10, with experience building scalable and maintainable backend systemsStrong experience designing, developing, and maintaining production APIs and backend servicesExperience diagnosing and resolving complex backend and API issuesExperience working with CI/CD pipelines and deployment automationStrong understanding of API design, backend reliability, and maintainable system architectureStrong interpersonal and collaboration skills across cross-functional teamsExperience writing clear and maintainable API integration documentationPragmatic problem-solving mindset with strong attention to reliability and simplicityCommitment to delivering high-quality, performant, and supportable solutionsAbility to work effectively in a collaborative, fast-moving engineering environmentNice to HaveExperience with Azure Functions and serverless architecturesExperience working with multi-tenant or multi-organisation systems at scaleFamiliarity with multicurrency implementations and internationalisation (i18n)Familiarity with OpenAPI 3.0 / 3.1 standardsExperience using AI-assisted development tools such as Claude CodeKnowledge of Infrastructure-as-Code tools such as TerraformPrevious experience working on booking, marketplace, or travel-related platformsBenefitsFixed Shifts: 12:00 PM - 9:30 PM IST (Summer) | 1:00 PM - 10:30 PM IST (Winter)No Weekend Work: Real work-life balance, not just wordsSupport That Matters: Mentorship, community, and forums where ideas are sharedTrue Belonging: A long-term career where your contributions are valued5-Day AI Training: Hands-on AI Academy onboarding to get you building with AI from day one At Smart Working, you’ll never be just another remote hire.Be a Smart Worker - valued, empowered, and part of a culture that celebrates integrity, excellence, and ambition.If that sounds like your kind of place, we’d love to hear your story. Originally posted on Himalayas