Role summary We are looking for a Senior .NET Architect to help redesign a mission-critical communication platform responsible for routing messages and files between internal systems and external partners. You will play a key role in defining and delivering a modern, cloud-native architecture built on .NET and Azure, with strong requirements around high availability, resilience, and performance. This role requires a strong technical expert who can not only design systems but also challenge technology choices, clearly articulate trade-offs (impacts, pros & cons), and stay up to date with the latest ecosystem evolutions. What you'll do Design and deliver modern integration services handling message and file ingestion, transformation, routing, and delivery (sync & async) Define architecture decisions and provide clear insights on technology choices, trade-offs, and impacts Architect systems for extreme resilience and high availability in a zero-downtime environment Apply advanced resilience patterns: circuit breaker, retries with backoff, timeouts, idempotency, outbox/inbox, Dlqs, bulkheads, sagas Design and implement event-driven architectures using Azure messaging services (e.g. Service Bus, Event Hubs) or similar pub/sub platforms Build high-quality .NET services (.NET 7/8, C#, ASP.NET Core, worker services, APIs) with strong focus on performance, security, and maintainability Design and deploy cloud-native workloads on Kubernetes (AKS/OpenShift), using container best practices and CI/CD pipelines Define and implement observability strategies (logging, tracing, monitoring) and contribute to SLOs and operational excellence Work in an agile environment, contributing to iterative delivery and continuous improvement Act as a technical leader and mentor, promoting engineering best practices within the team Minimum qualifications Extensive experience in software engineering, including several years working on distributed, high-availability systems Strong expertise in .NET ecosystem (C#, .NET 7/8, async programming, dependency injection, testing) Hands-on experience with Microsoft Azure (AKS, messaging services, Storage, monitoring, CI/CD) Proven experience designing event-driven architectures and understanding messaging patterns and trade-offs Strong knowledge of resilience and fault-tolerant design in distributed systems Experience with containers and orchestration (Docker, Kubernetes) Solid experience with CI/CD pipelines and modern development practices (TDD, trunk-based development) Ability to analyze, challenge, and justify technical decisions Autonomous, pragmatic, and able to operate in complex environments Professional English Nice to have Experience with observability tools (Opentelemetry, distributed tracing, etc.) Knowledge of enterprise integration patterns and secure file transfer protocols Experience in regulated or high-availability environments Familiarity with high-throughput systems and performance testing