Christian Schereiber

Defined a .NET 8 reference architecture using Clean Architecture, CQRS and the Mediator (MediatR) pattern for microservices, including validation with FluentValidation and technical documentation. Implemented real-time notifications using SignalR with JWT authentication. Centralized secret and connection-string management with Azure Key Vault and HashiCorp Vault, and set up CI/CD pipelines with Jenkins and GitHub Actions including release validation and observability via Application Insights and Elasticsearch/Kibana. Performed OWASP Top 10 security scanning using Burp Suite and Kali Linux and integrated Claude/Claude Code into the team workflow for code generation, refactoring, test generation and documentation.

Developed and maintained .NET microservices using the Mediator pattern with event-driven messaging over RabbitMQ and Amazon SQS/SNS, improving asynchronous service communication. Deployed and integrated cloud services on Azure (App Service, Azure SQL Database, Blob Storage) and AWS (Lambda, API Gateway, S3, RDS) and designed data-access patterns for performance and scalability. Built a frontend with Angular 17 and TypeScript and integrated CI/CD publishing to Azure Static Web Apps via GitHub Actions. Applied OWASP Top 10 security checks with Burp Suite and added unit tests into the CI/CD pipeline.

Led the development of an integration module with MuleSoft, standardizing reusable connectors and REST/SOAP web services between academic systems. Built a microservices API in Java with Spring Boot, focusing on critical endpoints and maintaining API contract documentation. Managed relational databases including Oracle, PostgreSQL and SQL Server, tuning indexes and query patterns to improve performance, and supported secure document/storage configuration in cloud secret management.

Built a module for digitizing the licensing process for medical programs by automating document validation. Implemented a licensing system using a microservices approach with Docker, MongoDB, Angular and Node.js, isolating each service in its own container. Developed the University Information System (SIU) using SQL Server with Angular and Node.js to centralize academic information at a national level.

Developed and maintained the SIAGIE system using C#, jQuery and SQL Server with Reporting Services for education institutions nationwide. Built a payment control service integrated with the banking core system via a backend integration workflow. Developed and maintained the PLANIN system for planning and budgeting using C#, jQuery and SQL Server with automated data extraction for budget reporting.

Developed HR modules (staff, payroll, contracts and compensation) using C#/VB with Oracle, including automated calculations for payroll logic. Built a hotel web application with backend-centered calculation logic covering reception, billing and cash register closing workflows. Implemented logistics and inventory modules such as work orders, technical sheets and shipping guides, integrating them with reporting functionality.

Delivered web applications using ASP.NET with C# and implemented data access using LINQ to SQL and Entity Framework. Applied N-tier architectures in custom solutions for independent clients, coordinating implementation details across application layers. Focused on maintainable backend structures and database integration to support client-specific requirements.