Ulrich Cech - Java Architect/Developer – Freelancer

Ratzeburg, Germany

Experience

Jan 2024 - Present

2 years 1 month

Java Architect/Developer – Freelancer

DHL/DP – Rentenservice

Implementation of a Java service (daemon) as part of the automated processing of death notifications
Technologies used: Java17, SpringBoot, Hexagonal Architecture, REST API, Oracle, Maven, SonarQube, FindBugs, Checkstyle

Oct 2023 - Present

2 years 4 months

Java Architect/Developer – Temp Assignment

DB Fernverkehr AG

Further development of the ticket booking flow, database optimizations
Technologies used: Java17, SpringBoot, microservice architecture, REST API, OpenAPI, PostgreSQL, Docker + Kubernetes, AWS environment, Gitlab CI, Maven, SonarQube, FindBugs, Checkstyle, OWASP + Trivy, WhiteSource, Renovate Bot

Aug 2021 - Aug 2023

2 years 1 month

Consultant/Java Architect – Freelancer

mecom - Medien-Communikations-GmbH

Various IT consulting and development tasks (MongoDB optimization, security topics (DDoS defense, BSI compliance, etc.), integration of Bean Validation for standardized checks, code reviews, and support in developing the new architecture for the alert platform)
Technologies used: Java17, SpringBoot, microservice architecture, REST API, Swagger API documentation, MongoDB, Docker + Kubernetes, Git/Gitlab CI, Maven, Jenkins CI, SonarQube, FindBugs, Checkstyle, OWASP + Trivy, JUnit, Mockito, JIRA, Confluence, Scrum

Feb 2021 - Sep 2023

2 years 8 months

Interim CTO, Software Architect/Developer/DevOps

Bytecookie UG

Full design and implementation of a startup's software platform (80,000 LoC)
Messaging system; rating system; recommendation system; custom video conferencing implementation for 1:1 video chats and group rooms; fully automated build/release pipelines
Technologies used: Java17, JakartaEE 10, REST API, AWS environment, PostgreSQL, Maven, JUnit, Mockito, OpenAPI, Sonargraph

Dec 2019 - Jan 2022

2 years 2 months

Founder

pinnwand.online

Full application design ("from idea to finished product")
Technologies used: JakartaEE 8, Java11, Payara 5/6, EJB/CDI, JPA, JSF, JavaScript, HTML/CSS, Primefaces, PostgreSQL, Gitlab CI, Docker, Maven, Bitbucket, SonarQube, FindBugs, Checkstyle, OWASP, JUnit, Mockito, PowerMock, Sonargraph, AWS ECS, Terraform, AWS Translate, Stripe (payment provider)

Oct 2019 - Mar 2023

3 years 6 months

Java Architect/Developer – Freelancer

LogPay Financial Services GmbH

Integration of Amazon Pay (Billing Agreement)
Integration of Paydirekt (oneClick)
New UI design for checkout pages
Technologies used: JavaEE 7, Java8, Wildfly, EJB/CDI, JPA, JSF, JavaScript, HTML/CSS, MySQL, SVN, Amazon Pay API, Paydirekt API, Maven, JUnit, Mockito, FindBugs, Checkstyle

Aug 2019 - Dec 2023

4 years 5 months

Java Architect/Developer – Freelancer

Aareal FirstFinancial Solutions AG

Further development of a deposit management software after company acquisition
Migration from Spring to Spring-Boot
Technologies used: Java8, Spring/Spring-Boot, Jetty, JSP, JavaScript, HTML/CSS, microservice architecture, REST API, MariaDB, Gitlab, Maven, JUnit, Mockito, JIRA, Confluence, FindBugs, Checkstyle, Sonargraph, Scrum

Jun 2018 - Oct 2020

2 years 5 months

Java Architect/Developer – Freelancer

Cubic Transportation Systems GmbH

Integration of payment service providers in a microservice architecture
Optimization of the Docker system architecture/environment
Redesign of the central purchase process of the online platform
Technologies used: Java11, Spring-Boot, Jetty/Tomcat, microservice architecture, REST API, Gitlab-CI, Docker, Kubernetes, Maven, JUnit, Mockito, JIRA, Confluence, FindBugs, Checkstyle, Scrum

May 2017 - Jan 2020

2 years 9 months

Founder of open source project

Lottoritter

Complete application design ("from idea to finished product")
Source code available on GitHub
Technologies used: JavaEE7/8, EJB/CDI, Payara5, REST API, MongoDB, MongoDB-Morphia, JSF, JavaScript, HTML/CSS, OAuth2, Docker, Maven, JUnit, Mockito, FindBugs, Checkstyle, SonarQube

Sep 2016 - May 2018

1 year 9 months

Architect and Java Developer

Deposit Solutions / Dt. Kautionspartner GmbH

Functional enhancement of a deposit management software
Design of a complete refactoring of the application
Functional enhancement of a tenant portal
Administration of the tenant portal on Amazon AWS
Redesign and implementation of a microservice for routing account transactions between different banks and target systems
Technologies used: Java7/8, Spring/Spring-Boot, Jetty, DropWizard, JSP, JSF, JavaScript, HTML/CSS, microservice architecture, REST API, MariaDB, Gitlab, Maven, JUnit, Mockito, FindBugs, Checkstyle, JIRA, Confluence, Amazon AWS, Scrum, OKR

Oct 2015 - Aug 2016

11 months

Architect and Java-Developer

bitmanager-media GmbH

Introduced Java EE 7
Designed and implemented a Java EE web application to replace and extend the functionality of a media industry IT system
Implemented service/change requests
Technologies Used: Java EE 7, JPA/Hibernate, EJB/CDI, JSF, WildFly, Oracle DB, JavaScript, HTML/CSS, Bootstrap, Maven, Git, JUnit, Mockito

Jun 2014 - Sep 2015

1 year 4 months

Senior Java-Developer

dreamIT GmbH

Architected and implemented a B2B REST API for integration with partner systems
Implemented and integrated new payment providers
Extended the existing product platform
Migrated from GlassFish 3.1.2 to Payara 4.1 (Java EE 6 to Java EE 7)
Optimized database access (MongoDB)
Technologies Used: Java EE 6/7, GlassFish/Payara, MongoDB, MongoDB-Morphia, JSF, JavaScript, HTML/CSS, PrimeFaces, Maven, Git, JUnit, Mockito, SonarQube

Jun 2013 - May 2014

1 year

Senior Java-Developer

Smaato Inc.

Architected and implemented a self-learning module for mobile device detection based on the HTTP user agent
Implemented a MapReduce application to analyze openRTB auctions
Implemented a MapReduce application to process various log file types and import the calculated business metrics into a visualization application
Technologies Used: Java, Spring, Tomcat, Apache Hadoop, microservice architecture, Amazon AWS, Maven, JUnit, Mockito

Nov 2006 - May 2013

6 years 7 months

Senior Java-Developer

AEB GmbH

Architected and implemented a central archiving software for all in-house specialist applications
Architected and implemented an SAP RFC/IDoc-to-web service converter
Architected and implemented a universally usable SAP RFC server component
Partly designed and partly implemented a new communication software for all in-house business applications
Technologies Used: Java, JBoss, Tomcat, PostgreSQL, Sybase, Oracle DB, Hibernate, SOAP web services, NoSQL, Apache Jackrabbit, Lucene, SAP JCO

Jul 2003 - Oct 2006

3 years 4 months

Java-Developer

AFI GmbH

Architected and implemented a web application as a frontend for business SAP workflows
Architected and implemented a centrally used module to communicate with the Saperion archive system
Architected and implemented a support research application for the entire message traffic with the German customs
Planned and implemented a file-based load balancing/dispatching software for the data center
Responsible for complete system maintenance of customs communication via the data center; extended the existing communication software
Technologies Used: Java, Tomcat, Sun Application Server, JSF, Sybase, PostgreSQL, HSQLDB, Hibernate, SAP JCO, EDIFACT