About the Role Company is seeking a highly experienced ASP.NET Lead Architect / Senior Developer to join our team. This role is ideal for a deeply technical professional with proven experience in designing, optimizing, and maintaining high-performance systems within the .NET 5 and Azure ecosystem. You will play a critical role in ensuring scalability, cost efficiency, and top-tier performance of our technology stack while leading the development of new features and delivering timely bug fixes. This is a highly technical role, requiring advanced problem-solving skills, attention to detail, and the ability to mentor and guide peers in best practices. Responsibilities Architecture & Optimization Revamp and fine-tune our ASP.NET web application stack for performance, cost effectiveness, and scalability. Design and optimize high-performance API services, proxy technologies, and multi-tenant database infrastructures. Development Build new features across backend, web, and mobile applications. Ensure clean, maintainable, and scalable code with strong adherence to standards. Support legacy Xamarin components where necessary. Maintenance & Operations Quickly troubleshoot and fix bugs. Oversee CI/CD pipelines to ensure smooth deployments. Work with monitoring and observability tools to maintain system health. Collaboration Collaborate closely with cross-functional teams (product, QA, DevOps). Communicate clearly in English (spoken and written) with stakeholders across geographies. Handle “overly confident developers” tactfully, ensuring technical transparency and simplicity. Tech Stack Programming Languages C# / .NET 5 / ASP.NET Core – Core backend services, API layer, and daemon services TypeScript + Angular – Shopify embedded apps, admin portal, CRM features React Native (JavaScript/TypeScript) – Mobile apps (iOS/Android, offline capabilities) Liquid – Shopify storefront & embedded UI integration XML – Domain modeling + code generation workflows SQL (T-SQL) – Azure SQL Server (master + tenant databases) NoSQL (CosmosDB / MongoDB API) – Operational data, caching, and sync storage Frameworks & Libraries .NET 5 – Services and APIs Xamarin.Forms – Legacy mobile components Entity Framework Core – ORM for SQL backends Mermaid – C4 diagrams (context/container/component) Custom XML CodeGen Tools – Auto-generating scaffolding Platforms & Infrastructure Azure Cloud – Core hosting environment Azure SQL Database – Master + tenant-sharded stores Azure CosmosDB – JSON/NoSQL operational store Azure Blob Storage – File storage (documents, exports, results) Azure Service Bus – Messaging, event routing, background jobs Shopify – E-commerce storefront + embedded integration SendGrid – Transactional/notification emails Klaviyo – Marketing automation and campaigns Calendly – Scheduling integration USPS API – Label generation, shipping automation Twilio – SMS messaging and alerts Observability & Ops Logging/Tracing – Azure Monitor + custom observability layer Metrics – Prometheus-style metrics capture integrated with .NET services Backup/Restore – Azure SQL backups + Mongo dump strategies CI/CD – Git-based pipelines with automated deployments Required Qualifications 15+ years of professional development experience in complex systems. Deep expertise in ASP.NET Core, .NET 5, and Azure. Strong understanding of multi-tenant architectures, performance optimization, and cost-effective scaling. Demonstrated ability to lead technical initiatives and mentor other developers. Advanced English (spoken and written): capable of leading meetings, writing documentation, and engaging in negotiations. Proven track record of delivering high-quality, scalable systems. Soft Skills Trustworthy, respectful, and honest. Hardworking and committed to delivery. High attention to detail. Collaborative, not difficult to work with, and effective in managing differing personalities within the team. Interview Process 2–3 interview stages, including technical and behavioral assessments. Final decision made by Company’s senior leadership in coordination with the hiring manager.