Senior Back-end Software Engineer (.NET)

Company DescriptionSoftware Mind develops solutions that make an impact for companies around the globe. Tech giants & unicorns, transformative projects, emerging technologies and limitless opportunities – these are a few words that describe an average day for us. Building cross-functional engineering teams that take ownership and crave more means we’re always on the lookout for talented people who bring passion and creativity to every project. Our culture embraces openness, acts with respect, shows grit & guts and combines employment with enjoyment.Job DescriptionProject – the aim you’ll haveOur client is a Belgian technology company specializing in advanced software and system integration for sectors such as automotive, mobility, and industry. They focus on building intelligent, data-driven solutions that enable automation, efficiency, and innovation. With strong expertise in embedded systems, cloud platforms, and AI, they support businesses in bridging the gap between hardware and software to accelerate digital transformation. You will contribute to the development of their main platform that is designed to streamline the collection, management, and analysis of data from diverse sources. It enables real-time monitoring, visualization, and insights that help teams make informed decisions quickly. With flexible integration options and a user-friendly interface, it simplifies the process of turning raw data into actionable intelligence, supporting use cases across development, testing, and operational environments.Position – How You’ll Contribute Collaborating with cross-functional teams to define, design, and ship new features. Architecting and developing robust and scalable backend systems. Collaborating with front-end developers to integrate user-facing elements using server-side logic. Optimizing applications for maximum speed and scalability. Contributing to the entire software development lifecycle, from concept to deployment. Staying up to date with industry trends and ensuring our technology stack is currentQualificationsExpectations – the experience you needA bachelor’s or master’s degree in computer science, engineering, or a related field. Proven experience (+3 years) as a backend engineer or similar role. Language & Platform: C# (10/11/12), .NET 6–8, SOLID principles, async/await, LINQ APIs & Web: ASP.NET Core (MVC/Minimal API), RESTful design, Swagger/OpenAPI, JWT/OIDC auth Data & Persistence: EF Core (migrations, tracking), SQL (query tuning, indexing), caching (MemoryCache/Distributed), Postgress db Messaging & Integration: Event-driven patterns, idempotency, Azure Service Bus/RabbitMQ/Kafka Testing & Quality: Unit/integration testing (xUnit, Moq), static analysis, code review Security: OWASP Top 10, secure coding, OAuth2/OIDC, Key Vault Cloud & DevOps: Azure App Service/Storage/Key Vault, CI/CD (GitHub Actions/Azure DevOps), Docker Observability & Maintenance: Serilog structured logging, OpenTelemetry, Application Insights Architecture & Patterns: Clean Architecture, DDD concepts, dependency injection, resiliency (Polly) Data-Intensive / Sensor / Timeseries: Handling large-volume streaming data, batch processing, optimized DB schema design for time-based data Tooling & Collaboration: Git branching, PR reviews, Azure DevOps or GitHub workflows Soft Skills & Ownership: Ownership from concept to production, mentoring, clear communication, excellent problem-solving and communication skills, ability to work effectively in a fast-paced and dynamic environment.Additional Skills – The Edge You Have Language & Platform: Performance profiling (BenchmarkDotNet, dotTrace), Span/Memory, source generators APIs & Web: gRPC or GraphQL, SignalR, API Gateway (YARP/NGINX) Data & Persistence: Dapper, Redis, NoSQL (MongoDB/Cosmos DB), CQRS/Event Sourcing Messaging & Integration: NServiceBus, MassTransit, saga/outbox patterns Testing & Quality: Contract testing (Pact), load testing (k6/JMeter) Security: Duende/IdentityServer, threat modeling, dependency scanning Cloud & DevOps: Kubernetes (AKS), IaC (Bicep/Terraform), blue/green deployments Observability & Maintenance: Grafana/Kibana dashboards, alerting, SLOs Architecture & Patterns: Modular monolith/microservices, feature flags, multi-tenancy Data-Intensive / Sensor / Timeseries: Experience with timeseries databases (InfluxDB, TimescaleDB), data ingestion pipelines (Azure Event Hub, Kafka, IoT Hub), ETL/ELT processes, real-time analytics, partitioning & retention strategies Tooling & Collaboration: Release automation, semantic versioning, SonarQube Soft Skills & Ownership: Cross-team coordination, architecture visionAdditional InformationOur offer – professional development, personal growth Flexible employment and remote work International projects with leading global clients Non-corporate atmosphere Language classes Internal & external training Private healthcare and insurance Multisport card Well-being initiatives Position at: Software Mind Poland