🌍Work mode – fully remote.📑Assignment type: up to 175 zl/h - B2B.⏳Contract length – 12 months with possibility of extensions.⏰Start – ASAP/1 month.✈Business Travels: to Denmark 2 x times a year.📕Language – English.⚙️Industry - pharmaceutical.Summary: The Senior Backend Developer will play a key role in designing and enhancing backend architectures for innovative digital solutions, directly impacting production efficiency and patient treatment access.Main Responsibilities:The Senior Backend Developer will be responsible for the design, development, and maintenance of backend systems, ensuring high-quality application performance. Design, develop, test, and maintain backend systems using C#/.NET 9 (Azure Functions and Web APIs) Configure and optimize Azure Cognitive Search (semantic search, custom indexers) Implement real-time capabilities using Azure Web PubSub Manage APIs via Azure API Management Provision and manage infrastructure as code using Bicep, including RBAC and service configurations Work with NoSQL and relational stores: Azure Cosmos DB and Azure SQL for BI/reporting needs Drive CI/CD with GitHub and GitHub Actions; maintain reliable pipelines and automated tests Troubleshoot, profile, and optimize performance and reliability Participate in code reviews, mentor peers, and contribute to architectural decisions Collaborate closely with product and design colleagues in an Agile environment Key Requirements: BSc or MSc in Computer Science, Software Engineering or related field 5+ years backend development experience with C#/.NET Practical experience with Azure (Functions, Cosmos DB, API Management) Experience with infrastructure as code (Bicep or equivalent) and CI/CD pipelines (GitHub Actions preferred) Strong software engineering fundamentals, testing practices, and design patterns Fluent English, written and spoken Familiarity with serverless/microservices patterns and mobile/PWA backends Knowledge of observability practices (logging, metrics, tracing) Nice to Have: Knowledge of software architecture principles Experience in mentoring junior developers Exposure to Agile methodologies