Senior Backend Engineer (.NET/C#) - full remote

Pracovní nabídka

Join a team that pushes the boundaries of artificial intelligence and creates innovative solutions for global clients. This is an American company with a development team based in Ostrava. Their products leverage the latest technologies to help businesses automate processes, improve decision-making, and deliver real value through AI-driven applications. We are looking for a Senior Backend Engineer (.NET/C#) who wants to contribute to the development of modern web systems and learn from experienced professionals.

Type of contract: full remote

Your responsibilities:

• Design and ship services in .NET 6-9/C# (ASP.NET Core, Minimal APIs, background workers/hosted services).
• Own data modelling in PostgreSQL—schema design, Dapper queries, DbUp migrations, indexing, query optimization.
• Work with Apache Cassandra 5.0 for agent and conversation data (wide-column design, partition/clustering keys, native vector search with SAI).
• Build real-time features with SignalR for chat streaming and live updates.
• Build and extend Tenant Management: authentication flows (JWT, OAuth 2.0, Azure AD), RBAC, secrets management, billing integration, and cross-tenant access rules.
• Build REST APIs with idempotent workflows, back-pressure, and retry strategies; integrate with RabbitMQ for async pipelines
• Integrate with Microsoft Graph API for Office 365, Outlook, and Teams functionality.
• Engineer for reliability: structured logging, meaningful metrics, health checks, circuit breakers, graceful degradation.
• Ship via Docker and GitHub Actions to Azure Container Apps; contribute to Terraform infrastructure.

Our requirements:

• Deep experience with building production systems in .NET/C#—you've owned APIs and data layers end-to-end.
• Strong PostgreSQL skills (required): schema design, query tuning, execution plans, isolation levels. Experience with Dapper or similar micro-ORMs preferred over Entity Framework.
• Strong grasp of Design Patterns and SOLID principles —you write clean, maintainable code and can articulate why.
• Complex distributed systems experience: concurrency, async/await patterns, transactions, consistency trade-offs, failure modes, and the judgment to make the right trade-offs.
• Hands-on messaging experience (RabbitMQ preferred, but Kafka/SQS/similar counts).
• CI/CD and Docker fluency; an IaC mindset.
• Clear async communication skills—critical for remote collaboration.

Why this company:

• fully remote cooperation
• small teams
• interesting product
• competitive compensation
• own real infrastructure
• non corporate environment, low bureaucracy