Apache Maven Experts in Frankfurt

Ornel Franck W.

Purchasing Manager, Logistics, IT Manager & Software Architect

Last position:

Sales Partner at ERGO PRO

Industry: Insurance, Trade, IT
Customers & Projects: Consulting and selling insurance and similar services
Main tasks: Insurance consulting (health insurance, retirement planning, wealth building); commercial services, inside and field sales; sales data analysis and forecasting; customer consulting and support; opening a new sales headquarters for private and business customers; business development & innovation management; business use case development; process optimization; stakeholder management; team leadership and training; preparation and delivery of trainings;
Technologies used: Microsoft Office 365, Microsoft Teams, Jira, Draw.IO, Camunda 8, Java (8, 17,21,25), Git, Spring Boot, Spring Batch, Spring Data REST, Spring Web, Spring Security, J-Unit, Playwright, Lombock, Vaadin, H2, PostgreSQL (16, 17 18), pgAdmin, Docker, LLMs, JasperSoft Studio, JasperReports

Boian V.

Solution Architect

Frankfurt

Last position:

Solution Architect at DB InfraGO AG

The Base Services of DB InfraGO form a central data hub between the company’s IT systems. Common Data Services are developed that distribute data from source systems to a variety of downstream systems (via JMS) and make them available (via REST API). The existing service landscape based on TIBCO is being migrated to DB InfraGO’s cloud-native platform.

Architecture design and implementation for performance-optimized bulk data processing of several million datasets at specific times during the day
Technical specification and documentation of business requirements
Integration of various subsystems (including SAP and Salesforce) through the reimplementation of more than 40 microservices based on Spring Boot
Migration of TIBCO Based microservices from the Enterprise Integration Platform to the Cloud Native Platform using Spring-Boot
Establishment of a deployment pipeline using GitLab CI/CD, Artifactory, and automated deployment to a Kubernetes environment with the help of ArgoCD
Definition and implementation of automated unit, integration, and regression tests

Team Size: 9

Technologies/Tools: Java, Spring Boot, ActiveMQ(JMS), JUnit, Tibco Business Works, Gitlab (CI/CD), Kubernetes (Amazon AWS), ArgoCD, postgreSQL, Oracle, Postman, Hoppscotch, openAPI, Sonarqube

Mario S.

Expert in Web Analytics, Tag Management and Consent Management

Last position:

Expert in Web Analytics, Tag Management and Consent Management at Deutsche Bahn AG

Conducting and evaluating web analyses
Creating and editing tags and scripts in the area of tag management as well as banners and other client-side web elements in the area of consent management
Technologies used in development: Tealium, JavaScript, IntelliJ, Git, Android Studio, Selenium, Appium, Adobe Analytics, Power Automate, Power App

Uday V.

Full Stack Java Developer and DevOps Engineer

Last position:

Senior Full Stack Java Developer & DevOps Engineer at Deutsche Börse (DBAG)

Project: SCS (Settlement / Clearing Services)

Settlement platform serving multiple trading and clearing venues — counterparty risk safeguarding, settlement volume reduction, central risk management, and post-trade anonymity.

Technologies: Java 17, Spring Boot 3, Microservices, Spring Data JPA, SonarQube, Fortify (SCST), Mockito, Jenkins, OpenShift, Maven, Podman, GitHub, JIRA, Liquibase, Swagger, AMQP, Apache Camel, Terraform, PostgreSQL, Instana, Graylog.

Identified and remediated CVEs in third-party libraries using SCA tooling, strengthening the security posture of production components.
Maintained 90% code coverage with SonarQube, improving code quality and reducing production defects.
Enabled mTLS for database authentication and message broker connections, enforcing encrypted, certificate-validated communication.
Designed and deployed microservices with asynchronous, REST-based communication between components.
Optimized a high-volume REST API (~200K requests) by reducing response time from 3s to 2s (33% improvement), boosting throughput and reliability under production load.
Automated build and continuous integration pipelines using Maven and Jenkins.
Orchestrated containerized workloads on Podman/OpenShift and governed schema evolution with Liquibase, ensuring reliable, repeatable deployments across all environments.
Optimized Java code and implemented EHCache-based caching, improving application performance.
Streamlined release management by governing application images, JAR versions, and dependencies through DBAG Artifactory, ensuring version consistency and audit traceability across environments

Jan M.

Founder, Senior Solution Architect, Team Lead, Senior DevOps Engineer

Heusenstamm

Last position:

Founder, Senior Solution Architect, Team Lead, Senior DevOps Engineer at CreArt IT GmbH

Hands-on solution architect
Digital product development - SaaS
Strategic consulting on software architecture, cloud migration, and DevOps processes
Coaching SE developers and IT architects

Ingo D.

Analytics

Last position:

Analytics at BaFin - Federal Financial Supervisory Authority Frankfurt

Introduction of methods for developing and automated deployment of cloud-native software and machine learning applications in OpenShift clusters
Development of various programs in Python
Technologies: Kubernetes, OpenShift, Kustomize, ArgoCD, Tekton, Docker, PodMan, Airflow, IntelliJ, PyCharm, Git, Bitbucket, Jira, Confluence, Python

Ulm P.

Freelance IT Specialist

Steinbach (Taunus)

Last position:

DataStage ETL Expert at ING Bank

Datastage 11.7, dbt, Oracle 19, Python 3.12 / PySpark 3.5, Azure GitHub, Azure DevOps, Automic
Development of migration jobs to transfer data from the collection DWH to the new Risk Mart, as well as development of ETL pipelines to migrate historical data from the old Mart to the new Risk Mart.
Storage of the silver layer on Hadoop and the gold layer in Oracle.
Translation of DataStage jobs into dbt to publish reporting data in Google Cloud to a PostgreSQL database.
Creation and optimization of complex SQL queries for data extraction from a data vault, taking into account historical data in the point-in-time tables.
Creation of Oracle table definitions (DDL) and adjustment of existing stored procedures.
Versioning changes in GitHub and deployment via the CI/CD portal.
Refactoring long-running DataStage jobs into Python using PySpark to reduce server load.
Migration of SAS scripts to PL/SQL, including new development of distribution functions that have no direct equivalent in Oracle.
Development of Automic jobs to run DataStage pipelines and Python scripts (PySpark jobs) that control the population of the SME and institutional risk tables in the Risk Mart and perform business calculations.
Participation in the agile process, including creating user stories, estimations, and planning in Azure DevOps.
Handling Azure DevOps tickets and close collaboration with testers and business teams for error analysis and resolution.

Werner K.

Test Coordinator, Designer and Engineer

Bad Homburg

Last position:

Test Coordinator, Designer and Engineer at IBM

Testing the SekIDP and related components
Test design, execution and automation, microservices, GitHub Enterprise, Eclipse, Katalon Test Platform, API Testing, Confluence 8, JIRA/Xray, Draw.io, Swagger/OpenAPI, Postman, Docker, Kubernetes, Podman, PuTTY, E-Health, Telematik, Gematik standards, EPA, E-Rezept, sektoraler IDP, encryption, XaDES, PaDES, DICOM, HL7, FHIR, IHE, ICD, SSO, SAML/Shibboleth, OAuth, smartcards, JWT, two factor authentication Android and iOS, Wireshark, BrowserStack, Cypress, gRPC, REST, SOAP, WS-Security, Linux Shell, PowerShell, SSH/SSL, Java, Kotlin, Cordova, Gradle, Groovy, Python, TypeScript

Tan P.

DevOps & Fullstack Engineer

Hanau

Last position:

DevOps Engineer in the DevOps Team at Rise-World

Implementation of specified DevOps solutions to automate infrastructure (Terraform, Bicep, CloudFormation, Ansible) on-premises datacenter (Ovirt, Proxmox, Ceph Cluster, MinIO) and private cloud.
Administration, configuration and implementation of CI/CD DevOps pipelines (GitLab, GitFlow) to support development process (Artifactory, Prometheus, Istio, service mesh, Helm Chart, OpenShift (Red Hat Enterprise) / Kubernetes cluster), Red Hat Satellite.
Administration, setup, monitoring and patching of Linux infrastructure based on Red Hat Enterprise for Dev, Test and QA.
Use of Scrum and Kanban methods.
Administration, configuration and implementation of security standards for deploying on Dev, Test, QA and Prod stages of the new ePA applications.
Development of new plugins and add-ons needed on current infrastructure.
Database support.
Data analytics support (Python, Spark, Pandas, Power BI, Splunk Enterprise).
Implementation of best practices for DevSecOps and BizDevOps using GitOps (ArgoCD), Streamlit framework, Semaphore Ansible UI.
Configuration and testing of iperf, uperf, sysbench using benchmark-operator for external source data and IoT/MDM devices, creating reports via ELK / OpenSearch.
Building a new Databricks platform to collect and analyze big data from different sources and IoT devices into Hadoop framework (Python, Pandas, PySpark, Power BI, Apache Airflow).
Building backend data aggregation and processing to automate configuration deployment between different OpenShift clusters and big data framework (Python, Pandas, PySpark, Apache Spark, PostgreSQL, Django 2, Ansible Automation, Jira JSM).
Building a new ML pipeline platform using Kubeflow, TensorFlow, KServe.
Data extraction, transformation and loading from different data sources including structured and unstructured data to analytic DWH / big data cluster using Python, Pandas, Polars, Power BI, Django backend and PostgreSQL.
Setup of new DevOps Test and QA HashiCorp Vault cluster for PKI and IAM.
Configuration and testing of automated patching based on CVSS score, SIEM-integrated CVEs.
Use of Nexpose and InsightVM to scan vulnerability events in network, host, container and application.
Design and implementation of secure and scalable AWS architectures including VPC, EC2, S3, RDS and Route53 and similar setups on Azure and GCP.
Automated system provisioning and deployment using CloudFormation templates.
Configuration of IAM roles, policies and permissions to ensure secure access control.
Patch management, backup automation and disaster recovery setup on AWS infrastructure.
Monitoring and optimization of system performance using AWS CloudWatch and AWS Trusted Advisor.
Support of VMware services (vSphere, Aria, Horizon) and the virtual desktop environment.
Development and maintenance of CI/CD pipelines using Jenkins, GitLab CI/CD and AWS CodePipeline with interface to Nutanix.
Configuration of AWS CloudWatch to monitor application performance and system events.
Planning and execution of migration of on-premises applications to AWS cloud platforms.
Deployment of containerized applications using Docker and Kubernetes in AWS environments.
Deployment of internal software packages between availability zones using AWS CodeDeploy.
Building and deploying ML models using Scikit-learn, XGBoost and Spark MLlib including hyperparameter tuning, model evaluation and production deployment.

Jochen H.

Managing Director

Eschborn

Last position:

DevSecOps Expert at DB InfraGO

Central build and delivery for 20+ applications, 100+ pipelines/day, 700+ GitLab projects
Build pipelines for Go, Java and JavaScript
Provisioning of 100+ components
Quality assurance via GitLab Code Quality and SonarQube
Checks for dependencies, licensing and vulnerabilities
Release creation via Jira and ServiceNow
SBOM, Supply Chain Security, distroless images
PoC GitLab Runner: Nomad vs. Kubernetes
Technologies: Artifactory, buildah, GitLab Premium, Go, Gradle, Jenkins, Mend, Podman

Sai K.

QA Engineer

Last position:

QA Engineer at Pharoscion Global Solutions

Worked on an Internet Banking System enabling secure customer transactions (fund transfers, bill payments, balance inquiries) and bank-side operations (account management, approvals).
Designed and executed manual and automated test cases for functional, regression, and integration testing across web and mobile platforms.
Automated end-to-end banking workflows using Selenium WebDriver, Java, and TestNG, and performed REST API testing with Postman for backend validation.
Built and maintained test automation frameworks using TestNG and Maven, and integrated with Jenkins CI/CD for continuous testing and reporting.
Generated detailed test execution reports with ExtentReports, including logs and screenshots for audits and stakeholders.
Collaborated in agile teams, contributing to UAT, test planning, and documentation across sprints.

Anusha L.

Test Automation Consultant

Frankfurt

Last position:

Test Automation Consultant at EON Energy

Design, develop, and maintain automated tests using Playwright with Python scripts, Typescript and Spring Boot
Create test classes annotated with Spring Boot Test
Create test scripts to cover functional, regression, and integration testing
Ensure test automation coverage for web applications
Collaborate with developers to identify testable requirements
Troubleshoot automation test failures and resolve issues
Integrate automated tests with CI/CD pipelines (e.g., Jenkins, GitLab CI/CD)
Monitor and report test automation metrics
Implement test data management and mocking strategies
Ensure test reliability, stability, and maintainability
Experience with containerization (Docker) and orchestration (Kubernetes)

Adil S.

Mobile/Backend Developer

Frankfurt

Last position:

Mobile/Backend Developer at Freelance

Built a cross-platform mobile application using React Native that interacts with IoT devices via RESTful APIs
Implemented state management with Redux and integrated IoT-specific components for smooth data visualization and device control
Developed RESTful APIs using Node.js and Express, utilizing MongoDB for scalable data storage
Facilitated secure communication between the mobile app and IoT devices, enabling device onboarding, status monitoring, and control commands
Implemented real-time data synchronization and optimized data flow to minimize latency

Ralf K.

Senior Java Developer, Consultant

Last position:

Senior Java Developer, Consultant at Dataport AÖR

Maintenance and further development of the Java/Swing-based @rtus FormsEditor
Design and development of a graphical formula editor based on Google Blockly to map a project-specific DSL, including parsing and code generation
Implementation of pixel-perfect synchronization between editor and print preview to improve user experience
Technologies: Java 17/21, Swing, JavaFX, JBoss/Wildfly, JUnit, Mockito, Blockly, JPedal, ICEPDF, Eclipse

Timur Y.