Jakarta EE 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

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

Umut G.

Freelancer

Frankfurt

Last position:

Data Architect at BA Technology

I am an experienced data engineer specializing in end‑to‑end data integration, cloud DWH architectures, and high‑quality, governed data products.

I delivered following projects and engagements as a freelancer.

Data Migration of CRM System for AL-FA Objekt Service Gmbh
Microsoft Software Resales Partnership

I am looking for freelance roles like: Freelance Data Engineer Cloud Data Warehouse Architect Data Modeling & Architecture Consultant MDM & Data Governance Specialist BI & Analytics Developer

Technical Focus Areas

Data Engineering & Integration: SQL Server/SSIS, Informatica PowerCenter/IDQ, Talend, Kafka, Azure Data Factory – Delta/CDC/ELT patterns, robust pipelines, monitoring/recovery, data lineage & impact analysis, medallion architecture Bronze/Silver/Gold layers
DWH & Cloud: Azure SQL / Data Lake / Synapse, AWS Redshift/S3, on‑prem SQL/Oracle – scalable data marts with a strong cost/benefit focus.
Data Modeling: Atomic (Inmon) and Dimensional (Kimball), Data Vault (Linstedt), Domain‑Driven Design, clear lineage & contracts.
MDM & Governance: Informatica MDM, IBM MDM, stewardship processes, data quality rules, survivorship/XREF, catalog/glossary, SIF/BES/REST publication.
Analytics/BI: Power BI, SSAS, Cognos – business‑ready, maintainable data products.

Minh D.

Project Manager / Business Analyst / Application Manager

Bad Vilbel

Last position:

Project Manager / Business Analyst / Application Manager at Finance and Insurance

Introducing 5 different process applications for various teams
Release planning: scope and time management
Resource/capacity planning
Conducting sprint planning / retrospectives
Increment planning (multiple sprints)
Preparing steering committee meetings / reporting to the executive board
Coordinating / aligning with external suppliers / deliveries
Multi-project resource planning
Aligning with the business unit and development team
Identifying best practices with IBM BAW
Cost control and planning for the project team and external service providers
Collecting KPIs using LogScale
Analyzing application errors with LogScale / queries
Defining user stories / aligning requirements with the business unit and development team
Testing and defect tracking
UI/UX design of the application
Preparing and facilitating brown-paper workshop
Test concept, test data, test organization, test execution
Recording team velocity / metrics
Executing tests
Scripts for automated testing
Organizing tests with the business unit and IT
Recording and prioritizing defects
Setting up and operating the application
Setting up application monitoring with LogScale dashboards
Checking health endpoints with PowerShell
Post mortem analysis
Setting up incident management
Setting up problem management
Analyzing errors using LogScale queries and dashboard
Pre-processing data for AI
Conducting evaluation with AI language models (Meta Llama 3.3 LLM and deepset Haystack) and RAG
Installing runtime environments for LLMs (large language model)
Evaluating various LLMs
Installing RAG (retrieval augmented generation) and integrating with LLM
Extracting unstructured data with LLM and RAG
Project based on IBM BAW (Business Automation Workflow), WebSphere Liberty, Domea, d.3, REST, LogScale (formerly Humio), Swagger, PowerShell, JIRA, Confluence, Lucom Interaction Platform (LIP), Mattermost, Jabber

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.

Anand R.

Lean Six Sigma Black Belt

Last position:

Freelancer Scrum Master, Mentor and Strategist at Confidential Fintec Startup

Provided coaching and support to Scrum teams to adopt and implement agile practices effectively
Analyzed business requirements and identified IT solutions to support business goals
Evaluated existing IT systems and processes to identify optimization opportunities
Managed stakeholder relationships and coaching
Facilitated Scrum ceremonies and ensured adherence to Scrum principles and practices
Identified and implemented lean startup process optimizations to improve efficiency and effectiveness of development and business processes
Developed and monitored daily business strategies to ensure development goals were met
Developed and implemented OKR strategies to align team goals with company objectives
Tools/Methodology: Jira, Confluence, Miro, PowerBI, team building & mentoring, conflict resolution, impediment 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

Shreya B.

Technical Leader

Neu-Isenburg

Last position:

Technical Leader at SLK Software

Participate in quality workshops for requirements gathering and fit/gap analysis
Demonstrated different QMS modules/processes with focus on customer requirements
Design and implementation of cloud based quality system reducing manual efforts for the client
Collaboration with cross functional teams to define and document system requirements
Understanding the existing business process flow and suggesting improvements over moving to new quality systems
Managed the implementation of a data migration strategy from legacy system to cloud
Providing solution walkthrough to the business users
Involved in integration of quality system with different third party systems
Preparing weekly status report and presenting the same to business users and project stakeholders

Kabir K.

AI Engineer / Banking IT Specialist

Last position:

AI Engineer / Banking IT Specialist at Hamburg Commercial Bank (HCOB) & Real Estate Firm

Developed a retrieval-augmented generation (RAG) application using LangChain and LangGraph for corporate document parsing, delivered as an installable Electron desktop application with local AI models via Ollama.
Currently providing ongoing AI feature support for the Loan Pricing Tool at Hamburg Commercial Bank, with a commitment of three days per month.
Architected Kubernetes-native solutions, including Helm chart configuration and Azure DevOps pipeline integration.

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)

Puya D.

Quality Assurance Consultant

Frankfurt

Last position:

Quality Assurance Consultant at Federal Employment Agency

Consulting and implementation of functional test requirements
Responsibility for and validation of test automation solutions in an agile team
Support for QA topics during weekly release tests
Creating test cases using Gherkin
Developing automated tests with Cucumber and Playwright
Specifying and maintaining automated and manual tests

Technologies used:

Confluence
Jira
Cucumber
Playwright
Typescript
Java
Git

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

Delly F.

Dad of 2 daughters

Dreieich

Last position:

Dad of 2 daughters at Family

Jörg-Ulrich H.