.NET Developer

.NET Developer We are looking for a .NET Developer responsible for developing and maintaining applications. You will work closely with our project team, analyze business requirements, and ensure high-quality code delivery through testing, code reviews, and the use of security tools. This role involves both developing new features and supporting production environments. About Cobalt Streamworks At Cobalt Streamworks, we focus on continuous self-development and acquiring new knowledge. We build solutions leveraging various cloud platforms and utilize cutting-edge technologies to deliver innovative results. If you are a fast learner, want to participate in international projects, are a team player, and can work independently — join us! We provide our clients with more than just code — we want to equip them with tools that allow their businesses to flourish. Our clients' success is our success, which is why we ensure that everyone who creates Cobalt Streamworks has a long-term goal in mind. At Cobalt Streamworks, you'll have the opportunity to discuss your challenges and solutions with our team of experts, including experienced architects who are always ready to share their knowledge and guide you through complex technical decisions. Responsibilities: Developing and maintaining .NET applications and collaborating with the project team Analyzing business requirements and translating them into technical solutions Ensuring code quality through unit testing, integration testing, code reviews, and vulnerability scanning Maintaining applications and providing production support Optimizing and updating software Participating in the automation of deployment processes Creating technical documentation Implementing RESTful APIs and integrating with external services Requirements: Minimum 3 years of commercial experience with .NET (Core/.NET 5+) Strong knowledge of C# and object-oriented programming Experience with ASP.NET Core and Web API development Proficiency in Entity Framework Core or other ORM tools Strong knowledge of SQL and relational databases (SQL Server, PostgreSQL) Experience with REST API development and consumption Familiarity with version control systems (Git) Knowledge of best programming practices (e.g., SOLID, KISS) and design patterns Ability to write unit and integration tests (xUnit, NUnit, or MSTest) Understanding of asynchronous programming and multithreading Nice to have: Experience with Azure cloud services (App Service, Functions, Service Bus) Knowledge of microservices architecture Experience with Docker and Kubernetes Familiarity with message brokers (RabbitMQ, Azure Service Bus, Kafka) Experience with front-end technologies (Angular, React, or Vue.js) Knowledge of CI/CD pipelines (Azure DevOps, GitHub Actions) Experience with NoSQL databases (MongoDB, CosmosDB) Familiarity with Domain-Driven Design (DDD) principles Knowledge of authentication and authorization (OAuth, JWT, IdentityServer) What We Offer: Salary: 90-130 PLN/h (B2B) Training and certification funding with learning opportunities during work hours Private medical care through Medicover Multisport benefits Language classes (English) Flexible working hours Team meetings and integration events Referral bonus for recommending new employe