Senior Backend Engineer (.NET / Python / Azure)

Location: Poland; Czechia; Bulgaria; Croatia; Romania; France About Gramian Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs. About the Role Our client is a Big4 Consultancy group that works with leading financial institutions on AI-driven transformation, automation, advanced analytics, and financial crime prevention . Their are building a production-grade AI-assisted KYC / Customer Due Diligence platform for an international insurance environment. We are looking for an experienced Backend / Full-Stack Engineer to build the services connecting the AI-driven CDD platform with enterprise systems. The role requires strong hands-on experience across C#/.NET and Python , with a focus on APIs, enterprise integrations, asynchronous workflows, containerization, Azure DevOps, and production reliability. CONTRACT: B2B or B2C contract COMMITMENT: Full-time, 3-4 months contract with possibility of extension or getting on new projects LOCATIONS: Remote, EU-based candidates START: ASAP PROCESS: Initial qualification followed by client interviews Responsibilities Build middleware APIs connecting enterprise applications, data platforms, and legacy systems. Develop and maintain ASP.NET Core Web APIs and Python services. Extend AI-driven service modules and connector frameworks. Implement reliable asynchronous workflows , callbacks, retries, and safe write-back mechanisms. Integrate with REST APIs, messaging systems, queues, databases, and enterprise platforms. Package and deploy services using Docker and CI/CD pipelines. Support deployments to Azure / Databricks-based environments. Write and maintain unit and integration tests . Troubleshoot issues found during testing and in production. Contribute to a business-critical platform where uptime, speed, and correct results are essential Requirements Strong hands-on experience with C# / .NET and ASP.NET Core Web APIs . Practical experience with Python , ideally FastAPI or a comparable framework. Experience building and integrating REST APIs and enterprise services. Experience with messaging / queues and asynchronous integration patterns . Strong experience with Docker, Git, and Azure DevOps CI/CD . Experience writing unit and integration tests for production services. Ability to work across modern cloud services and legacy enterprise systems. Fluent English and ability to work remotely within the EU.