Bitbucket Experts in Cologne

Jens R.

Technical Product Owner

Kerpen

Last position:

Platform Architect & Senior Developer at Direct client, industrial measurement technology, medium-sized company

Technical leadership across hardware, firmware, and software teams; scope: hardware/firmware team (4 people) and leadership group (5 people)
Consolidated and documented a product family that had grown over more than 15 years and aligned it with CRA compliance — from the bare-metal I/O module to the cloud interface.
Provided the most important customer product with the essential requirements and architecture documentation within two months — for a firmware landscape that had grown over more than 15 years. It now supports the customer’s modernization strategy.
Established a monthly reporting line to the supervisory board and executive board within three months: nine meetings since 12/2025. The report itself is versioned and built from the CI pipeline; it is based on automatically collected activity and release data instead of assessments.
Built a container-based CI/CD infrastructure from scratch: cross-compilation, host tests, and documentation builds in one continuous pipeline.
Introduced declarative QA gates for DevOps and development artifacts — from the start using lefthook instead of pre-commit, executed in a dedicated container image.

Technologies used: arc42, req42, tpo42, docToolchain, PlantUML, ArchiMate, C4 model, ADR, C, C++ (GTest), CMake, Bare Metal (ARM Cortex-M3/M7), OCI containers, Jenkins, lefthook, Prometheus, Grafana, SBOM, CRA, OPC, SCADA, PLC integration, IPv6 migration, Zero Trust, Sociocracy 3.0, Cynefin

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

Manuel S.

Apro-IT – Make IT A Project!

Last position:

Project Manager at Univention

Industry: digital sovereignty, public sector

Responsibilities:

Project coordination (teams: consulting, development, testing, deployment/operations)

Products and standards:

Jira, Confluence, Asana, Miro, Mural
Open Source, Keycloak, Open Xchange, ownCloud

Alexander K.

Senior QA Engineer | Quality Management | Test Automation | AI & LLM Testing

Kerpen

Last position:

Software Tester at Buhl Tax Service GmbH

AI-assisted creation of test cases and test data
Creation of test cases based on requirements
Execution of manual tests
Defect documentation, retesting and tracking

Technologies & Tools: SCRUM, Jira, Confluence, Zephyr Scale

Hooman B.

Fullstack Developer

Cologne

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.

Jannik J.

Freelance Salesforce Consultant & Developer

Cologne

Last position:

Freelance Salesforce Consultant & Developer at Self-employed

Consulted on and delivered over 30 Salesforce projects (Sales Cloud, Service Cloud, Experience Cloud, Pardot, Marketing Cloud)
Designed and built CRM architectures, including requirements management, data modeling, and automation
Implemented custom solutions (Apex, LWC, Flows, integrations)
Developed interfaces with ERP, DMS, and email systems (SAP, Microsoft Dynamics, DocuWare, among others)
Introduced agile project methods (Scrum, Kanban) in customer projects
Coached internal Salesforce teams (admin and developer training)

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

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

Pappu P.

Senior Cloud Consultant (AWS Services and Consulting)

Last position:

Senior Cloud Consultant (AWS Services and Consulting) at devoteam GmbH

Developed automated ETL pipelines with AWS Glue and Athena to ensure consistent data quality and governance requirements
Implemented validation, anonymization, and encryption measures for data in compliance with GDPR
Optimized cloud costs by introducing FinOps practices and increased transparency for business units
Monitored performance, performed root cause analyses, and ensured adherence to SLAs
Supported data and solution architects in building scalable data models for ML and analytics scenarios

Fabian K.

Managing Partner

Last position:

Managing Partner at FK Solution Design GmbH

Founded FK Solution Design GmbH and acts as managing partner.
Optimizes existing system landscapes, reduces data silos, and connects software systems.
Enables more efficient data usage and reduces process lead time.

Vishali T.

Senior Analyst

Last position:

Senior Analyst at Accenture

Facilitated data retrieval for first-assist applications through an interface that fetches content based on client input criteria and loads it into the database via batch processing.

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

Building test automation with Cucumber

Cologne

Last position:

Rewe Digital

Creation of Spring Boot integration tests
Creation of JUnit tests for the coupon system
Creation of component tests for Kafka topics
Creation of CI/CD pipeline scripts
Creation of UI tests with Playwright
Creation of UI tests with Cypress
Review of developer unit tests
Planning the test architecture for integration tests
Creation of the test automation concept
Evaluation and creation of test reports

Alexander S.

TYPO3 Senior Fullstack Developer, Backend & Frontend

Bergisch Gladbach

Last position:

TYPO3 Senior Fullstack Developer, Backend & Frontend at Vergleich.de Gesellschaft für Verbraucherinformation mbH via HALIAN GmbH

Typoscript
Extbase
Fluid
Typescript
requireJS
WebVital

Jacqueline K.

Senior Java/Kotlin Fullstack Cloud DevOps