IBM Db2 Experts in Cologne

Hooman B.

Fullstack Developer

Last position:

Fullstack Developer at Möbel Roller GmbH

Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.

Burhan D.

Experienced IT and AI Architect

Niederkassel

Last position:

Enterprise Architect & Solution Architect at DB Netz AG

With project PRIZMA, DB will modernize its infrastructure on the one hand, and develop a fail-safe IT landscape on the other hand, which can be restored quickly and securely in case of a disaster.

Capture current architectures of existing systems as well as methodical consulting and development of target architectures
Deepen and maintain the building plan / target IT landscape
Implement technical architecture concepts & architecture descriptions
Implement migration concepts for updating and further developing the platform and information systems
Assess submitted improvement suggestions as part of the project
Capability management: identify capability gaps, develop target visions, and support transformation planning within the enterprise architecture.
Create a compatibility matrix of the components in use and compare dependencies of specific versions
Create an IT concept for extending the platform with the following topics: hardware and software requirements, security, licensing, high availability, load balancing, backup & recovery, update strategy, monitoring integration, etc.
Coordinate with business architects as well as technical architects from the cross-functional architecture area of the PRISMA program for the topics (backup, Active Directory, monitoring, Citrix, and business applications ...)
Status meetings and alignment of project planning with the Release Train Engineer / Project Manager
Advise the Release Train Engineer / Project Manager in identifying project risks
Advise the System Architect Engineers in steering the implementation of the concept
Implement the IT concept
Document the infrastructure

Label: MS Project, LINUX, Windows, ORACLE, Java, REST, SharePoint, Microsoft Exchange, UML, Enterprise Architect, BPMN, AZURE, AWS, V-MODEL, Micro Service, VisualStudio, SAP S/4HANA, SCRUM(SAFE), ESB (TIBCO), Python, Innovator, LeanIX (TOGAF), Ansible, Ansible Tower, Ansible Automation, ROBOT, SpringBoot

Christoph S.

Test Manager

Last position:

Test Manager at Logistics

Coordination and planning, execution, documentation, and analysis of test cases
Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
Implementation and maintenance of test cases according to the test concepts
Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365

Stefan M.

Installation Portal Server and Content Management Integration

Köln

Last position:

Bundesrechtsanwaltskammer

Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
Documentation of test cases, execution steps, and test results.
Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.

Thomas P.

Freelance Software Architect

Köln

Last position:

Freelance Software Architect at Self-employed

Allal K.

Java Senior Full Stack Developer

Frechen

Last position:

Java Senior Full Stack Developer at Insurance ÖRAG

Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
My role: Senior Software Developer.
The team consists of 12 developers.
Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga

Markus G.

Full Stack Developer

Frechen

Last position:

Full Stack Developer at REWE Digital

A warehouse valuation system was reimplemented using Java, Spring Boot, and Camunda. The backend solution focuses on integration and batch calculations, the frontend on managing formulas and reviewing results.
Java 21
Spring Boot
JPA
Maven
REST
Kafka
PostgreSQL
DB2
Liquibase
Google Cloud Storage
Keycloak
GitLab CI/CD
Helm
Terragrunt
SonarQube
Angular
IntelliJ
JUnit 5
Mockito
Open API

Sebastian H.

Overall Project Manager; Turnaround Manager & Coach

Bornheim

Last position:

Overall Project Manager; Turnaround Manager & Coach at Statutory Health Insurance Fund

Taking over the troubled project from the internal project management and successful turnaround of project phase 1 (cutover of approx. 1000 servers (VMs)/standard desktops, specialized desktops)
Responsible project management for the successful phase 1 transition (planning in the shortest possible time followed by implementation (very successful with low ticket volume))
Stakeholder management – taking over direct (daily before cutover) communication with the client from the Chief Operation Manager in the format of regular meetings in taskforce mode. Rapid rebuilding of the previously lost trust base and restoration of the client relationship for optimal satisfaction
Taskforce mode to eliminate all existing issues/showstoppers before cutover
Scope clarification, setup, and scheduling of phase 2 activities (e.g. silo/admin servers)
Kick-off of phase 2 / handing the project back to the success line for the internal project management/line to handle the remaining defined topics
Establishing, preparing, and conducting steering committees with V-1 management to align the guardrails
Moderation of various regular meetings and operational workshops
Participation in the lessons learned with the client to address dissatisfaction related to the internal project management (before my start! They are extremely satisfied with my work)
Tools: Atlassian Suite (Confluence/JIRA), MIRO, Sharepoint; MS Office (PowerPoint, Excel, MS Project)

Andreas E.

Consultant

Bergisch Gladbach

Last position:

Consultant at Iteratec GmbH

Alexander V.

Software Architect / Software Engineer / Tech Lead

Last position:

Senior DevOps / Platform Engineer at Kaufland e-commerce / real.digital (ex hitmeister.de)

Evolved the platform from bare-metal infrastructure with a monolithic PHP application to a hybrid Google Cloud architecture with Go microservices on Kubernetes
Managed and scaled a production infrastructure with 300+ VMs and dozens of clusters, including MySQL, PostgreSQL, MongoDB, RabbitMQ, Redis and Elasticsearch clusters
Designed architecture, deployment, monitoring, performance analysis, and upgrades for all platform services using Terraform and Ansible
Migrated observability systems from ELK and Prometheus to Datadog, managed with Terraform
Introduced Jenkins CI/CD with SonarQube integration and automated tests to speed up feedback cycles
Containerized the testing environment and implemented GitLab CI pipelines for Docker image builds, static code analysis, and infrastructure tests
Performed zero-downtime migrations of MySQL and MongoDB clusters to Google Cloud
Developed reusable Ansible roles for database clusters and automated data obfuscation for staging environments
Decomposed monolithic databases and migrated to microservice architectures
Built tools to detect and optimize slow queries in MySQL and MongoDB
Conducted online schema migrations with pt-online-schema-change without downtime windows
Developed internal Go applications for batch queries, GitLab-Jira integration, and MongoDB backup recovery
Technologies: Debian, Ubuntu, Alpine, Go, Bash, Python, PHP, SQL, GitLab CI, Jenkins, Drone CI, MySQL, MongoDB, PostgreSQL, Redis, Elasticsearch, RabbitMQ, Kafka, Docker, Kubernetes, Nomad, Ansible, Terraform, Grafana, ELK, Prometheus, Datadog, Nagios, Zabbix, Nginx, HAProxy, Vault, Helm, SonarQube, Filebeat, Auditbeat, Google Cloud, AWS

Vladimir M.

Developer

Brühl

Last position:

Developer at Financial services provider

Support and further development of a framework for developing applications in a banking association: DynS/OSPE
Migration of the framework to Java 11 and Java 17
Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira

Peter B.

Data Warehouse Consultant (Development and Analysis)

Köln

Last position:

Data Warehouse Consultant (Development and Analysis) at Atruvia AG

Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
Analyzed data quality and developed test procedures
Created PowerShell scripts and documented GIT deployment processes
Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts

Jacqueline H.

Düsseldorf

Last position:

Kitchen Appliance Manufacturer

Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks

Robert M.

Air traffic tax German Customs Administration SOAP Webservices Client Requests

Bonn

Last position:

Air traffic tax German Customs Administration SOAP Webservices Client Requests at Team GmbH

In the citizens' and business customer portal of the Customs Administration, airlines submit applications for departures and landings every month
These applications are forwarded to the caseworkers via SOAP web service and, after review and processing, any queries or notifications are returned via SOAP web service
PL/SQL programming of SOAP webservices client requests for HTTP/XML message exchange between the BuG portal and the caseworkers
New creation and change requests for Forms and Reports 12 modules
Forms applications start and read SOAP webservice requests via PL/SQL packages, process them and send Reports 12 documents to the airlines

Building test automation with Cucumber