Backend Development
Java, Spring Boot, Spring Data JPA, Spring Security, Spring Boot Actuator, JDBC, Maven, npm, Node.js, Express.js, C#, ASP.NET MVC, REST APIs, Web Services, JWT
Architecture
Microservices, DDD, CQRS, Saga, Event Sourcing, Event-Driven Architecture, Outbox Pattern
Databases
PostgreSQL, MySQL, Microsoft SQL Server, MongoDB, Elasticsearch
Caching, ORM & Message Brokers
Redis, Hibernate, Mongoose, Sequelize, RabbitMQ
DevOps & CI/CD
Docker, Kubernetes, Bash Scripting, GitLab CI/CD, Jenkins, PM2
Testing & API Documentation
TDD, JUnit, Jest, Supertest, Mocha, Swagger/OpenAPI
Frontend
HTML, CSS, React, Angular, JavaScript, TypeScript (Basic)
Integration
JSON, XML, CSV, WSDL, FTP, SFTP, IDoc, RFC, SOAP, REST, Native SQL, Apache NiFi
Monitoring & Logging
ELK Stack (Elasticsearch, Logstash, Kibana), Slack Webhooks
SAP & SAP Integration
ABAP, SAP HANA, SAPUI5/Fiori, SAP BTP, Cloud Foundry, Kyma, RAP, CDS, SD/MM/PP/FI/QM, BAPI, BAdI, SmartForms, ALV, Enhancements, User Exits, Customer Exits, OData, IDoc, RFC, SOAP, REST, E-Invoice, E-Archive, GIB integration
Agile & Collaboration
Agile, Scrum, Kanban, Jira, Sprint Planning, Sprint Review, Code Review, Retrospectives
