Freelance Software Engineer

Work experience

Freelance Backend Engineer at DVC - energy sector
07/2024 - Present

• Focus on Backend Development from API to database
• Create new endpoint, implement logic and persist with JPA
• Edit and improve existing code (more maintainable)
• Upgrade Spring Boot, Hibernate, Jackson, Kotlin etc

Tech Stack: Kotlin, Spring Boot 3, OpenShift, Gitlab, DB2, Gradle, Docker

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Freelance Software Engineer in the health sector
09/2023 - 02/2024

• Extend Backend for new Feature: Rest API endpoint, Logic in Service, Testing with Junit
• Improving CI/CD Pipeline and Docker image size
• Setup developer environment
• Caching for performance

Tech Stack: Java 17, Spring Boot 3, Kotlin, AWS, Bash, Docker, Kubernetes, Maven, Gitlab, Postgresql, Redis

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Freelance Java Backend Entwickler at MHP GmbH for Porsche AG
08/2022 - 06/2023

• Kafka event stream using AWS Lambda
• Spring Boot Secret rotation during runtime
• Circuit Breaker and Retry Handler for 3-party APIs + error handling
• Upgrade microservice to Java 17
• Fix Docker image based on Alpine
• DynamoDb local tests with Testcontainers

Tech Stack: Kotlin, Java, Spring Boot, TypeScript, Nest.js, Kafka, Terraform, AWS Stack, Docker, Maven, DynamoDb

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Freelance Backend Developer at SD&C GmbH - banking sector
12/2021 - 02/2022

• Improved software to follow 3-layered architecture
• Refactoring for cleaner code
• Implement feature: Editable Email system to notify about the status of the credit lending

Tech Stack: Java, Spring Boot, Docker, MSSQL, Camunda, IBM MQ, Liquibase

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Backend Engineer at Signavio GmbH
01/2019 - 12/2020

• Feature development, maintenance and bug fixing in Java
• Performance improvements for Signavio dictionary
• Update web application from Java 8 to Java 11
• Application startup check for database type
• Deployment of Signavio Process Manager (Dockerized)
• CI-Migration from Jenkins to CircleCi
• Started basic use of Kubernetes and AWS

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Automation Engineer at Signavio GmbH
09/2016 - 01/2019

• Automation of development tasks for 3 engineering teams using Java, Kotlin, Groovy and Gradle as well as Docker, Gitlab and Jenkins
• Custom Java client library
• UI and API test framework in Kotlin
• Groovy scripts for job generation
• Gradle build and release scripts
• Containerization with Docker
• Orchestration with Docker-Compose
• Automated Signavio website deploy and tool updates

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QA Automation Engineer (Backend) at idealo internet GmbH
08/2014 – 08/2016

• Develop complex End-2-End test setup as well as full backend regression tests
• Automated functional and non-functional tests on Rest API layer in Java and Node.js
• BDD with Cucumber

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Internship in Brazil as software engineer at Research lab, „Universidade Federal de São Carlos“
07/2012 – 09/2012

• Development of a web application for multimedia-based content with Grails (Java and Groovy)
• Frontend using HTML, CSS and JavaScript and a template

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Internship as software developer at hmmh multimediahaus AG
09/2010 – 01/2011

• Software quality in Java projects
• Continuous integration with Hudson
• Quality measurement with SonarQube
• Frontend development with Flash (AS3)

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Skills

Programming	Java, Kotlin, TypeScript, JavaScript, Bash, Groovy
Framework	Spring Boot, Kafka, Hibernate, RestEasy, Guice, Node.js, Nest.js
Environment	Linux Ubuntu/Mint/Debian, AWS, IntelliJ, Github, Gitlab, Android
DevOps	Docker, Terraform, Jenkins, AWS Codebuild, Ansible, Kubernetes
Observability	Grafana, Elasticsearch, Kibana, Logstash, Apache Spark
Database	MongoDB, MySql, Postgresql and DynamoDB
Method	Agile development: Scrum and Kanban
Collaboration	Jira, Confluence, GitHub Issues, Notion
Languages	German - native English - fluent Arabic - moderate

Education

Master of Science “International studies media informatics“ at Hochschule für Technik und Wirtschaft Berlin
10/2011 - 06/2014

• Web development and Mobile (Java, Android, Groovy/Grails, JavaScript, Node.js)
• Algorithms and image processing in Java

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Bachelor of Science “International studies media informatics“ at Hochschule Bremen
09/2007 – 06/2011

• Focus on Software and web development (computer science 80%)
• Understanding of UI & UX (Design 20%)

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