Tilo Kowalski - Backend Developer

Limburg an der Lahn, Germany

Experience

Jul 2024 - Jun 2025

1 year

Backend Developer

Implementing business processes based on BPMN 2.0, mainly with Java, ABAP, and JavaScript
Analyzing, documenting, and fixing bugs
Communicating with clients to analyze reported bugs and clarify technical requirements
Writing and documenting technical notes with SAP CWB to prepare bug fixes and new features for delivery

Dec 2023 - Jul 2025

1 year 8 months

Full-Stack Developer & DevOps Engineer

Migrating from Java 8 to Java 17 and updating the used technologies and dependencies
Redeveloping the core backend module
Introducing Docker and configuring the image
Developing and integrating a new CI/CD pipeline
Conducting security reviews and overhauling dependency management for compliance
Implementing monitoring mechanisms to ensure availability and detect errors

Dec 2023 - Jun 2024

7 months

Full-Stack Developer

Designing the architecture and rewriting 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

Mar 2023 - Nov 2023

9 months

Java Developer

Identifying technical and functional requirements and designing the architecture
Visualizing processes with BPMN 2.0
Technical conception of a solution
Implementing a generic XML and CSV mapper for processing incoming data
Implementing a database-based transaction logic for calling SAP services
Close collaboration with the business department
Developing automated tests

Apr 2021 - May 2023

2 years 2 months

Lead Java Developer

Leading a small development team to design and implement a RESTful backend
Creating a role and permission concept
Automating accounting processes
Quality assurance and test management
Implementing various requirements
Configuring a ticketing system

Sep 2020 - Jul 2022

1 year 11 months

PHP Developer

Designing and implementing new modules tailored to individual customer needs, e.g., a fleet management module
Developing interfaces for import & export for accounting software and e-commerce platforms
Further development of a proprietary ORM framework and ticket system
Creating unit and integration tests
Frontend development

Mar 2017 - Apr 2020

3 years 2 months

Full-Stack Developer

Analyzing, documenting, and fixing bugs
Automating business processes by developing new backend functionalities
Adjusting and extending interfaces
Documenting technical implementations for new features
Frontend development, designing marketing materials

Skills

Over 8 Years Of Experience In Cloud And Backend Development, Especially With Java And Spring Boot
Extensive Experience Designing And Building Rest And Soap Web Services And Working With Openapi Specifications
Solid Know-how In Jakarta Ee Architectures
Broad Experience In Devops, Building Ci/cd Pipelines, And Working With Docker
Experience In Software Testing And Working In Agile Teams (Scrum And Kanban)
Implementing Business-related Web Services
Migrating And Integrating Legacy Systems Into Modern, Microservice-based Architectures
Performance Optimizations In Backend Systems
Configuring And Administrating Applications, Frameworks, And Web Servers For Deployment In Cloud Environments
Integrating Mapping And Messaging Components, E.g., With Apache Camel And Apache Kafka
Implementing Authentication And Authorization In Web Applications, Especially With Jwt, Openid Connect, And Oauth 2.0
Redesigning And Simplifying Software Architectures In Existing Applications
Diagnosing And Fixing Issues In Production Environments (Ticketing & Bug Fixing)
Implementing Automated Monitoring And Alerting Mechanisms For Critical Systems
Developing Unit And Integration Tests
Abap Development And Working With Sap Systems
Frontend Development, E.g., With Angular
Banking
Financial Services
Insurance
It Service Providers
Erp Software
Association Management
Postgresql
Mysql / Mariadb
Db2
Java, Java Ee / Jakarta Ee
Spring Framework, Spring Boot
Jpa (Hibernate And Spring Data Jpa)
Liquibase, Junit, Mockito, Selenium
Rest, Soap (Including Jax-rs And Jax-ws)
Api Development (Json, Xml, Etc.)
Sql, Php, Abap
Intellij
Eclipse
Vs Code
Git
Svn
Bitbucket
Jenkins
Rundeck
Gitlab Ci
Github Actions
Argocd
Maven
Composer
Npm
Docker
Docker Compose
Docker Swarm
Kubernetes
Helm
Portainer
Prometheus
Grafana
Jboss / Wildfly
Tomcat / Tomee
Camunda
Aris Cloud
Confluence
Jira