Senior Software Engineer -.NET

Job Summary: Convo is looking for a Senior Backend Engineer [.NET 10] with 6+ years of backend engineering experience to build scalable, secure, and cloud-native backend services, APIs, MCP servers, and multi-tenant enterprise solutions. The ideal candidate should have strong expertise in C#, .NET 10, ASP.NET Core, Azure, microservices, REST APIs, databases, event-driven architecture, API security, and automated testing, with experience building reliable production-grade systems. Technical mission Build scalable and secure backend services, outbound data contracts, MCP servers and monetization services for multi-tenant enterprise solution and partner access using .NET 10, ASP.NET Core and cloud-native Microsoft technologies. Key responsibilities * Design and implement scalable .NET 10 / Core microservices for Studio and marketplace workflows. * Design and expose versioned REST APIs and MCP interfaces over approved data and agent capabilities using ASP.NET Core. * Implement outbound contracts for data products, events, cached views and partner integrations, ensuring schema consistency, backward compatibility and reliable delivery. * Build token/usage metering, rate limits, quotas and auditable consumption records for API and platform usage. * Implement authentication, authorization, tenant isolation and secure partner/API access using modern identity and security patterns. * Design and implement asynchronous and event-driven backend workflows using messaging/event-streaming technologies where required. * Implement resilient distributed-service patterns including retry, circuit breaker, timeout, idempotency, caching, concurrency control and graceful degradation. * Develop data-access services using Entity Framework Core, SQL databases and appropriate NoSQL/data-store technologies. * Add automated unit, integration, contract, API, security and performance tests with complete service telemetry and observability. * Participate in architecture and technical design discussions, code reviews and engineering standards across backend services. * Own services through the complete lifecycle including development, CI/CD, deployment, monitoring, troubleshooting, production support and operational documentation. Required technical capabilities * Minimum experience: 6+ years in backend engineering, including 3+ years building cloud-native .NET microservices, secure APIs or multi-tenant platforms. * Advanced experience with C#, .NET 10 / .NET Core, including Web API, dependency injection, middleware, configuration, background services and asynchronous programming. * Strong understanding of REST/GraphQL API design, HTTP, API versioning, OpenAPI/Swagger, schema contracts, pagination, filtering, error handling and backward compatibility. * Practical knowledge of MCP servers, MCP protocol concepts and structured tool interfaces, with the ability to expose approved backend capabilities securely to AI/agent runtimes. * Strong experience building cloud-native microservices, containerized applications and distributed systems using Docker and Kubernetes. * Strong knowledge of Microsoft Azure cloud services, particularly Azure App Service, Azure Container Apps/AKS, Azure Functions, Azure API Management, Azure Key Vault, Azure Service Bus/Event Grid and Azure Monitor/Application Insights. * Strong understanding of database technologies, including SQL Server/PostgreSQL, Entity Framework Core, database design, transactions, indexing, query optimization and connection management. * Experience with distributed caching and data-access patterns, including Redis and appropriate caching/invalidation strategies. * Strong understanding of event-driven architecture and messaging, including Azure Service Bus, Kafka or equivalent technologies. * Strong knowledge of multi-tenant architecture and security, including tenant isolation, tenant-aware data access, secure configuration and fine-grained authorization. * Strong experience with OAuth 2.0, OpenID Connect, JWT, Azure Entra ID/Identity and service-to-service authentication. * Experience implementing API security, rate limiting, throttling, quotas, secrets management, encryption and secure service-to-service communication. * Strong knowledge of API gateways and enterprise integration patterns, including Azure API Management or equivalent technologies. * Experience with CI/CD and DevOps, including Azure DevOps or GitHub Actions, automated builds, testing, container image management and deployment pipelines. * Strong automated testing experience using xUnit/NUnit, Moq/NSubstitute, integration testing and API/contract testing frameworks. * Strong understanding of observability, including structured logging, distributed tracing, metrics, health checks and Application Performance Monitoring using OpenTelemetry, Serilog and Azure Application Insights or equivalent platforms. * Strong understanding of distributed-service reliability and operational patterns, including resiliency, fault tolerance, idempotency, correlation IDs, dead-letter handling and disaster/recovery considerations. * Proficiency with Git, pull-request-based development, code reviews, branching strategies and engineering quality practices. Preferred experience * Experience with usage/token metering, billing events, subscription models or API monetization platforms. * Experience building event-driven data platforms, data-product delivery mechanisms and partner integration gateways. * Experience with MCP server development and AI/agent platform integrations, particularly exposing enterprise data and capabilities through secure tool interfaces. * Experience with Azure API Management policies, API products, subscriptions, quotas and rate limiting. * Experience with Kafka, Azure Event Hubs, Azure Service Bus or other enterprise event-streaming platforms. * Experience with Redis, distributed caching and high-throughput backend systems. * Experience with OAuth2/OIDC, Azure Entra ID, managed identities, workload identities and service-to-service identity. * Experience with policy enforcement and fine-grained authorization, including RBAC, ABAC or policy-based authorization models. * Experience with OpenTelemetry, Grafana, Prometheus, Application Insights or equivalent observability platforms. * Experience working with AI/LLM platforms, agent runtimes, tool calling and enterprise AI integrations. * Experience with Domain-Driven Design (DDD), Clean Architecture, CQRS and event-driven architecture. * Experience optimizing high-throughput, low-latency .NET services, including asynchronous processing, parallelism, memory management and performance profiling. Expected deliverables / acceptance evidence * Production-ready .NET 10 / .NET Core backend services with documented APIs and OpenAPI specifications. * MCP server implementations and documented outbound data/API contract catalogue. * Metering, quota, rate-limit and audit mechanisms with automated reconciliation and integration tests. * Secure multi-tenant architecture with demonstrated authentication, authorization, tenant isolation and API security controls. * Automated unit, integration, contract, security and performance test suites with agreed coverage and quality gates. * CI/CD pipelines supporting automated build, test, security scanning, containerization and deployment. * Production telemetry, dashboards, alerts, health checks and distributed tracing for backend services. * Architecture/design documentation, API specifications, runbooks and operational support documentation. * Production troubleshooting and operational ownership, including incident analysis, root-cause analysis and performance optimization. * Contractor/team handover documentation and knowledge-transfer sessions where applicable. Primary interfaces Works with Front-End Engineering, Architecture Office, DevOps/Cloud Engineering and Security/Identity owners to design, implement and operate secure, scalable .NET backend services and integrations. What We Have For You * Great compensation package, medical benefit for you and your family, free lunch, annual performance-tied increments & performance recognition awards and a great lean and agile work culture! * Convo endorses a culture of diversity in all aspects and aims to build a diverse team of amazing individuals!