OpenShift Experts in Stuttgart

Sercan T.

Certified Professional for Software Architecture Foundation Level

Esslingen am Neckar

Last position:

Co-Founder & Lead Software Architect at Pflege-Pfad

Focus: System architecture, cloud-native platforms, microservices, API design
Product: Pflege-Pfad is a digital placement platform that directly connects relatives of people in need of care with verified care services and caregivers – without an agency and without ongoing fees.
Business analysis & process design:
Analysis of the German care market and identification of the key pain points of both target groups.
Modeling of core business processes: registration, verification, care request, application, placement, and rating.
Definition of the business model as a freemium/premium model with optional contact unlocking.
Creation of user stories and requirements documentation for relatives, care services, and administrators.
Design of trust and quality assurance mechanisms with document upload, admin review process, and rating system.
Coordination with stakeholders and validation of product decisions with potential users.
Technical implementation:
Design and implementation of the entire platform architecture as the sole developer.
Design and implementation of a REST API with Spring Boot and Kotlin, including JWT-based authentication.
Development of the frontend as a single-page application with Angular 17.
Implementation of the AWS infrastructure with EC2, RDS PostgreSQL, S3, CloudFront, and IAM.
Document upload with AWS S3 using presigned URLs to verify care services.
Email notifications via Resend API.
AI-supported care service search via OpenAI API.
Implementation of complete user flows such as registration, login, password reset, and the placement process.
Development of an admin panel for user and care service management as well as analytics.
CI/CD with GitHub Actions and containerized deployments with Docker.
End-to-end tests with Playwright.

Technologies: Kotlin, Spring Boot 3, Spring Security, JWT, JPA/Hibernate, PostgreSQL, Angular 17, TypeScript, RxJS, AWS (EC2, ECS, S3, CloudFront CDN, RDS PostgreSQL, IAM), nginx, GitHub Actions, Playwright, Maven, Git, OpenAI API, Resend API, Docker, Scrum, i18n (DE/EN/TR), Kiro, feature flag architecture.

Will O.

Solution Architect

Esslingen

Last position:

Solution Architect at Polizei Behörde Stuttgart

Designed a migration strategy for WLS applications to BKA Cloud and Stack IT
Created a hybrid cloud for internal testing and development with Kubernetes
Transformed the IT landscape from an outdated monolithic architecture to a cloud-based architecture
Integrated new CI/CD processes using Azure Pipelines
Quadrupled the processing throughput for personnel security checks
Migrated personnel security screening applications to Docker-based applications
Implemented CI/deployment pipelines using Azure DevOps
Environment: Java Springboot, Kubernetes, Oracle Weblogic, OpenID, Camunda, JUnit, TOGAF

Matthias S.

Software Developer and Consultant

Böblingen

Last position:

Software Developer and Consultant at CLADE GmbH

Analysis of the existing CAN communication between microcontrollers
Analysis of the sensors used and the measured values collected
Planning the CAN messages for transmitting the measured values
Iterative adjustment of the microcontroller code to the new CAN messages
Cross-compilation from x64 to arm64

Salim C.

Cloud / Systems Architect

Last position:

Cloud / Systems Architect

Development and introduction of operations processes
Preparation of complete documentation packages (including incident management and operations support) to meet compliance requirements
Introduction of a workshop on IaC (Infrastructure as Code)
Technical consulting for the project security concept (ISMS)
Installation and operation of Kubernetes clusters on AWS, on-prem, and Azure
Hybrid cloud architecture design (on-prem, Hetzner, AWS)
Analysis and troubleshooting of incidents and system outages
Network adjustments for firewall rules, gateways, OpenVPN settings, and IPsec tunnels (pfSense)
Technical consulting on Bitbucket, Jenkins, and GitLab CI/CD pipelines
Consulting on Ansible deployments and infrastructure automation
Consulting on building a scalable system in the cloud (AWS / Azure)
Technologies / Tools: Ansible, Terraform, AWS, Azure, VPN, pfSense, Jenkins, Bitbucket, Kubernetes, GitLab Runner, ISMS, Golang, Prometheus, Grafana, S3, Lambda, RDS, ECS, Cognito, OIDC, Harbor, MinIO, Postgres, Redis, Keycloak, Ceph, Proxmox, CloudFormation, PostgreSQL, Flux CD, Hetzner, IONOS, Sonatype Nexus Repository, Entra ID, Dex IdP, Pulumi

Lothar H.

Solution Manager for the investigation PoC and exchange and refinement of an existing cloud and IoT power plant control system

Ditzingen

Last position:

Solution Manager for the investigation PoC and exchange and refinement of an existing cloud and IoT power plant control system at Shell AG and NEXT Kraftwerke GmbH

Investigation PoC and exchange and refinement of an existing cloud and IoT power plant control solution for certificate management of renewable energy power plants (solar, wind, biomass and others) of the largest European renewable energy power plant operator in this field, including investigation of the IoT devices used in the field and their integration and network connection with the aim of automated PKI key management.
Messaging with Kubernetes for large API-connected enterprise applications
Risk and Attack Vector Analysis, Software Quality & Bug Assessments
Agile Workload Scheduling via Jira & ConJluence
Evaluation of message streams Pub/Sub for MQ and KaJka.
Various tests with “best design approaches” regarding resilience patterns such as Circuit Breaker Designs, Throughput Measurement and Monitoring, Bulkhead Governors - for robust EA design
Integration of API Management with IBMs API Connect to Kubernetes - for agnostic Microservices API Management Designs. Google Apigee
Solution Health Check Approaches for Load Burst Situations + Remedy
Research and investigation of available potential subcontractors in the coordinating role as Solution Manager. CIS20 Controls.
Dread and Stride Security Assessments.

Alexander Z.

Fullstack Developer and DevOps Engineer

Last position:

Fullstack Developer and DevOps Engineer at Freelancer

Developing the infrastructure and improving existing infrastructure: Jenkins, Gitlab Pipeline, OpenShift, Docker, Helm Chart, Kubernetes, Artifactory, CodePipeline, CodeArtifact, Python
Documenting solutions in Jira/Confluence
Supporting other colleagues in different technical areas

Maik S.

Senior Software Engineer – Java, Spring, Microservices, Cloud, Docker, BPM and Telematics Projects

Erdmannhausen

Development of a new generation of Spring Boot microservices for an archiving system on OpenShift, monitoring, security analyses

Stack: Java, Spring Boot, Kafka, Vaadin, OpenShift 4.x, Maven, Artifactory, Jenkins, Git/Github, GitHub Copilot, GitOps, CI/CD, Kargo/ArgoCD

Robin S.

Senior Cloud & Backend Engineer

Last position:

Senior Cloud & Backend Engineer at Media-Saturn-Holding GmbH

Implementing applications with Kotlin and Ktor as microservices
Using MongoDB in the MongoDB Atlas cloud
Asynchronous communication of services via Google Pub/Sub
Using Kotest and MockK for unit tests
Developing an administration frontend with TypeScript, React and Express.js
Provisioning environments in GCP using Terraform
Implementing CI/CD processes with GitHub Actions
Operating scalable production and test environments in GCP with Kubernetes, Helm and Flux CD
Monitoring environments with Prometheus and Grafana
Providing BI data in the Google BigQuery data warehouse

Achille C.

Backend/Frontend Developer

Vaihingen an der Enz

Last position:

Backend/Frontend Developer at ITZ-Bund

Development of a microservice application for calculating postings on accounts
Development of backend components with Java or JEE, Quarkus, Kafka, Rest API
Development of the test component with mocking frameworks (Mockito)
Development of integration test components
Creation of OpenAPI specification format
Configuration of CI/CD pipeline
Development of frontend components with React
Design, further development and optimization of system structures
Code review
Java Corretto 21, JEE, Quarkus, Golang
Reactive programming with Spring WebFlux, Project Reactor
Git, Azure DevOps for CI/CD pipeline, YAML, Json Swagger UI, Postman, Rest OpenAPI, Kafka Streams, Kafka Connect, Log4J
Microservices, Jira, Confluence, MySQL, Docker, Kubernetes (deployment via Helm charts)
Spring Security, OAuth 2, JWT, Sonarqube
IntelliJ, Maven, logging framework Splunk, Agile method Scrum, Nexus, Vaadin V24, build tool Vite
React, React.JS, Node.js, Jess/JavaScript, Tailwind CSS, Agile method Scrum, accessibility BITV, Playwright

Boas B.

CTO, Complex Cloud Solutions

Filderstadt

Last position:

Technical Leader and Executive Sponsor, AI Solution Assistant

Product owner and Executive Sponsor for AI Assistant trained on a knowledge base of past solution designs, RFP documents, and current product documentation
Used by close to 100 global architects and engineers in pre-sales and post-sales
Generates full solution documents with requirement driven architecture decisions, solution overview, diagrams, bill of material, roles and responsibility matrix
Technologies: AI, LLM, Chat Bot, RAG, Agentic AI, Vector Databases, Public Cloud

Ahmed F.

Senior Lead Engineer (Freelance)