Design and development of an email marketing automation SaaS

maildroppa.com

Internet und Informationstechnologie

10-50 Mitarbeiter

Marcus leads a remote team of software developers, designers and technical writers in developing an email marketing tool.

Tools & Technologies

● Backend: Java 26, Quarkus, Junit 5, Hibernate Panache, AWS S3, Jax-RS, Rest-Easy, Json, Jackson, Auth0, JWT/Oauth 2.0, Flyway, PdfBox, Stripe, Docker, Digital Ocean Cloud, git on gitlab, sonarcloud.io, Intellij IDEA Ultimate, Postman

● AI: OpenAI API, Retrieval-Augmented Generation (RAG)

● Frontend App: React 18.x with React Router and React Hooks

● Sales page: Fully responsive html 5, Figma

Software Architect, Trainer, Coach

Self-employed

Internet und Informationstechnologie

< 10 Mitarbeiter

Marcus is one of the top Java experts designing clean, simple, pragmatic
software architectures for microservices. He has many years of experience in
microservices development. For his clients he mainly uses Spring and Spring
Boot but also likes to use modern cloud-native frameworks such as
Micronaut or Quarkus. His focus is on the customer and their product.
Marcus supports his customers in delivering stable, highly maintainable
software – on time and on budget. To achieve this, Marcus relies on a detailed
requirements analysis as well as a high test coverage with unit and integration
tests and static code analysis tools like Sonar Source.

Java & Quarkus Expert

Major German Energy Services Provider

Energie, Wasser und Umwelt

5000-10.000 Mitarbeiter

Modernization of a large-scale Java enterprise application

The project modernizes a complex enterprise application that has evolved over many years. The existing Spring-based legacy system runs on Java 8, OSGi and Eclipse RCP and is being migrated incrementally to a modern, maintainable architecture based on Java 25 and Quarkus.

Marcus contributes across analysis, architecture, refactoring and implementation. A central focus is untangling long-standing structures and dependencies and establishing a clean, sustainable Java and Quarkus technology stack.

Java Cloud Expert - Modernization of a Legacy Monolith

Automotive Industry

Automobil und Fahrzeugbau

>10.000 Mitarbeiter

Large-scale project with more than 100 participants and an individual contribution of more than 300 person-days in a full-time engagement.

Modernized and modularized an aging monolith: migrated Java 8 to 21, Spring Boot 2 to 3.3 and Hibernate 5 to 6; simplified the Maven structure and reduced build time from about 15 minutes to 50 seconds; introduced a hexagonal DDD architecture and comprehensive end-to-end integration tests with REST Assured and JUnit 5.

Entwicklung einer Finanzsoftware (Software as a Service, SaaS) Lösung mit Java 11, Quarkus, Stripe

Undisclosed

Banken und Finanzdienstleistungen

50-250 Mitarbeiter

Für einen mittelständigen Kunden habe ich ein Saas im Finanzbereich entwickelt.
Dabei waren unter anderem Java 11, Quarkus, Stripe und PdfBox im Einsatz.

Integration of the UK market with the credit card system of a large German financial institution.

German Financial Institute

Banken und Finanzdienstleistungen

500-1000 Mitarbeiter

Design, Architecture Implementation, Test and maintenance of several Spring Boot based microservices to send and receive, validate and process events in a Kafka based high concurrency system running on the azure cloud platform.

Tools & Technologies

Java 8, Java 11, Spring Boot, Kafka, Junit 5, Mockito, Assertj, JPA, H2, Microsoft SQL Server, Liquibase, Rest, Json, Lombok, Docker, Kubernetes, Jenkins, Git on Bitbucket, SonarQube, Intellij IDEA Ultimate

Integration of an electronic signature (QES) provider

Identity Verification Provider

Internet und Informationstechnologie

50-250 Mitarbeiter

Design and Architecture for a spring boot-based microservice architecture

for automated identity verification (GwG compliant). Integration of a remote provider for the secure creation of electronic signatures (QES).

Tools & Technologies

Java 8, Java 11, Spring Boot, Junit 4, Mockito, Assertj, JPA, H2, Postgres, Flyway, Rest, Json, Lombok, Docker, Kubernetes, Jenkins, Git on Github, SonarQube, Intellij IDEA Ultimate

Java Architect and Developer

undisclosed

Internet und Informationstechnologie

50-250 Mitarbeiter

Greenfield Development of an online tool for the visualization of insurance data from the healthcare sector.

The tool consisted of an Angular Frontend and a Java 11 Backend. Marcus
supported the customer throughout the entire process, from the design of the
overall architecture, to the implementation and testing of the Java microservices -
both through automated testing with Junit 5, as well as end-to-end testing of the
rest interface with Postman.
Tools & Technologies
Java 11, Micronaut, Junit 5, Mockito, Assertj, JPA, H2, Postgres, Flyway, Rest,
Json, Lombok, Logback, Docker, Kubernetes, Jenkins, Git on Github, SonarQube,
Intellij IDEA, Postman

Principal Product Manager Technical (Developer Advocate)

Red Hat GmbH

Internet und Informationstechnologie

>10.000 Mitarbeiter

Helped to create the vision for Red Hat's tools and technology and inspiring professional software and systems engineers to solve problems. Led Developer Experience strategies across multiple product teams.
Responsibilities:
• Creating technical content
• Speaking at conferences
• Empowering engineers Ьу delivering hands-on workshops
• Building partnerships with individuals, companies, and organizations
• Connecting with other engineers to identify how Red Hat might help them to bе even more successful
• Gathering product feedback that will inform engineering decision-making
• Supporting engineers оп forums, social media, meet-ups and other places

SOA Specialist

Vodafone Kabel Deutschland GmbH

Telekommunikation

>10.000 Mitarbeiter

Responsible for design, development, test and maintenance of distributed, large scale resilient systems. Backend / Middleware Development - Mostly SOA Webservices and Batch-Jobs
Tools & Technologies
Java 8, Spring 4, Spring Batch, JPA 2.1, Mockito, PowerMock, Junit, Maven, Sonar
Qube

Software Architect

financial.com AG

Banken und Finanzdienstleistungen

50-250 Mitarbeiter

Loadbalanced Jboss-domain-clustering in consideration of fulltime availability and full system resilience.

Jboss AS 7.1, Apache 2.2, Modcluster 1.2, Linux, MySQL 5, Maven 3.0.4, Hudson
2.x, Nexus 2.x

Senior Software Engineer

Wirecard AG

Banken und Finanzdienstleistungen

1000-5000 Mitarbeiter

Processing of nfc/ credit card-transactions in in the six-figure range, in real time as well as in batch operations, in consideration of performance and full reliability. Rest and SOAP based remote communication (B2B and B2C), web frontend extensions, specifying design-, architecture- and implementation-guidelines for the whole development team, interviews with new developers and acting as direct interface to product management.

Tools & Technologies
Java SE 6 und SE 7, Java EE 5, Spring 3.1, Hibernate 3.6, Tapestry 4, SOA
(Rest, SOAP), Maven 3.0.4, Jenkins 1.5, Nexus, Sonar Server, Oracle 11,
Tomcat 7, Jetty 8/9, Eclipse 4.2, Linux

Senior Software Developer

abs Fondsplattform

Banken und Finanzdienstleistungen

50-250 Mitarbeiter

Development of the UI of a SOAP-based stock-market-ordering-proxy, introduction of quality guidelines using Sonar Server, release-management and productive rollout on a tomcat-cluster in consideration of fulltime availability and full system resilience.

Java SE 5 und SE 6, Java EE 5, Spring, Hibernate, Cocoon, SOA (XML, SOAP, Hessian), Liquibase, Maven 2+3, Hudson, Nexus, Sonar Server, Eclipse 3.5, Oracle 10, Tomcat 6, Linux

Frontend Developer

Searchteq / t-info GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

Person in charge for SEO and XML local search interface, as used by bing maps. Analysis, design and implementation of a technical concept which increased the number of unique visitors of the local search engine by ten times. Based on my own (freetime) initiative, conversion of all development projects from Maven 1 to Maven 2, inhouse training of all developer colleagues, integration of Hudson and Nexus as the company’s CI environmentFrontend development (Java, HTML, CSS, Ajax) for a local search engine.

Java SE 5 und SE 6, Java EE 5, Spring, Hibernate, SOA(XML, JSON), SEO, JSP + JSTL 1.1, Apache POI, HTML, CSS, Javascript, Ajax, Maven 1+2, Hudson, Nexus, Tomcat, Linux

Java Developer (Thesis 1,3)

NCR AG

Banken und Finanzdienstleistungen

>10.000 Mitarbeiter

Cash Office – The design and implementation of a retail cash management application in a store environment (Java Swing + JGoodies Forms Framework)

Tools & Technologies
Java SE 5, Swing, JGoodies Framework, SQL, MS SQL, Tomcat 5.5, Eclipse 3.2

Dipl. Informatik (FH) - Computer Science Degree

University of Applied Sciences Augsburg

Sonstiges

50-250 Mitarbeiter

Developer, Working Student

Innowake GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

Extensions for an image database (PHP), Extensions for an XMLParser (Java), Development of an interface for a barcode scanner (Java)

Tools & Technologies
Java SE 5, J2EE 1.4, Struts 1.2, PHP 4, XML, Maven 1, Apache, Tomcat 5.5, DB2, Eclipse 3.1

Developer, Working Student

Digicon Ltd. Brisbane, Australia

Internet und Informationstechnologie

10-50 Mitarbeiter

Refactoring of a Java CMS, JUnit Testing, Acceptance Tests with Fitnesse, SEO Optimization of a Website

Tools & Technologies
Java SE 1.4, J2EE 1.4, Servlets, JSP, SEO, Fit + FitNesse, JBoss, Eclipse 2.

Developer, Working Student

Site Ezy Ltd., Brisbane, Australia

Internet und Informationstechnologie

10-50 Mitarbeiter

Implementation of a PHP SMS Module
Development of user interfaces with access to a database in VB.Net
Database design for MySQL and MS SQL Server
Tools & Technologies
PHP 4, VB.NET, SQL, MySQL, Visual Studio, MS SQL Server, Dreamweaver

Developer, Working Student

BMW AG

Automobil und Fahrzeugbau

>10.000 Mitarbeiter

Development of a Struts-based user interface to simplify queries to an Oracle database for BMW vehicle parts

Tools & Technologies
Java SE 1.4, J2EE 1.3, Struts 1.02, Tomcat 4.1, JDBC, SQL, Oracle, Eclipse 2.0

Intern

PC Professional Magazine

Medien und Verlage

50-250 Mitarbeiter

Working as a technical editor, editorial meetings, research for magazine articles,
composition of magazine news flashes, Hardware benchmarking

Java Architekt, Cloud, Docker, Kubernetes, Kafka, Spring Boot, Quarkus, Microservices, React, NextJs

Profilanlagen

Über mich

Skills

Erfahrung

Sprachen

Projekthistorie

Design and development of an email marketing automation SaaS

Software Architect, Trainer, Coach

Java & Quarkus Expert

Java Cloud Expert - Modernization of a Legacy Monolith

Entwicklung einer Finanzsoftware (Software as a Service, SaaS) Lösung mit Java 11, Quarkus, Stripe

Integration of the UK market with the credit card system of a large German financial institution.

Integration of an electronic signature (QES) provider

Java Architect and Developer

Principal Product Manager Technical (Developer Advocate)

SOA Specialist

Software Architect

Senior Software Engineer

Senior Software Developer

Frontend Developer

Java Developer (Thesis 1,3)

Dipl. Informatik (FH) - Computer Science Degree

Developer, Working Student

Developer, Working Student

Developer, Working Student

Developer, Working Student

Intern

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