Senior Software Engineer - .NET

Job SummaryConvo 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 missionBuild 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 ResponsibilitiesDesign 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 CapabilitiesMinimum 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 ExperienceExperience 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 evidenceProduction-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 InterfacesWorks 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 YouGreat 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!