Tilo K. - Backend Developer

Limburg an der Lahn, Germany

Experience

Jul 2024 - Jun 2025

1 year

Implementation of business processes based on BPMN 2.0, mainly with Java, ABAP and JS
Analysis, documentation and fixing of bugs
Communication with clients to analyze reported bugs and clarify technical requirements
Writing and documenting technical notes with SAP CWB to prepare for the delivery of bug fixes and new features
System environment: Java, SAP, ABAP, HANA, ODATA, UI5 / Fiori Elements, Eclipse, Scrum, Confluence, Jira

Dec 2023 - Jul 2025

1 year 8 months

Migration from Java 8 to Java 17 and updating technologies and dependencies
New development of the core module in the backend
Introduction of Docker and image configuration
Development and integration of a new CI/CD pipeline
Security checks and overhaul of dependency management for compliance
Setting up monitoring to ensure availability and detect errors
System environment: Java 8 & 17, Jakarta EE, JSF, PrimeFaces, MySQL, TomEE, Docker (Swarm), GitHub Actions, Portainer, Nginx Proxy Manager, IntelliJ, Git, Grafana

Dec 2023 - Jun 2024

7 months

Designing the architecture and reprogramming the native Java application
Developing and integrating a RESTful API
Implementing WebSockets for real-time updates
Introducing Kerberos for authentication and authorization via SSO
Frontend development using Angular
System environment: Java, Spring Boot, JUnit, REST, WebSockets, Kerberos, Maven, Angular, Tailwind, Jenkins, Docker, IntelliJ, Git, Bitbucket, Confluence, Jira

Mar 2023 - Nov 2023

9 months

Identifying technical and business requirements and designing the architecture
Visualizing processes with BPMN 2.0
Technical design of a solution
Implementing a generic XML and CSV mapper to process incoming data
Implementing database-based transaction logic for calling SAP services
Close collaboration with the business department
Developing automated tests
System environment: Java, Spring Boot, JUnit, Mockito, Liquibase, DB2, Apache CXF, WSDL, ESB, SAP FS-CD, IntelliJ, Git, Bitbucket, Confluence, Jira

Apr 2021 - May 2023

2 years 2 months

Leading a small developer team in designing and implementing a RESTful backend
Creating a roles and permissions concept
Automating accounting processes
Quality assurance and test management
Implementing various requirements
Configuring a ticketing system
System environment: Java, Spring Boot, JUnit, Liquibase, PostgreSQL, OAuth 2.0, MantisBT, VS Code, Git, PayPal API, FinTS, Docker

Sep 2020 - Jul 2022

1 year 11 months

Design and implementation of new modules tailored to individual customer requirements, e.g. a fleet management module
Development of import/export interfaces for accounting software and e-commerce platforms
Further development of a proprietary ORM framework and ticket system
Development of unit and integration tests
Frontend development
System environment: PHP, Zend Framework, PHPUnit, Shell scripting, JavaScript, SCSS, VS Code, Git, DATEV, Addison

Mar 2017 - Apr 2020

3 years 2 months

Analysis, documentation, and bug fixing
Automation of business processes by developing new backend features
Adaptation and extension of interfaces
Documenting technical implementations for new features
Frontend development, design of marketing materials
System environment: Java 7, Java EE, Maven, PHP, JavaScript, Smarty, HTML, Scrum, SVN, MantisBT, NetBeans, Adobe Creative Cloud