UML 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 matchmaking platform that connects relatives of people in need of care directly 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 the 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 a solo 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 via presigned URLs for verification of 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 placement process.
Building 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.

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

German R.

Freelance Technical Product Owner & AI Product Builder

Last position:

Freelance Technical Product Owner & AI Product Builder at Neckarshore AI / Freelance

Two complementary tracks: (a) building my own AI products and open-source tools under the Neckarshore AI brand, with a focus on AI-supported multi-agent development processes and documentation automation; (b) freelance support for industrial, logistics, and financial companies in IT-related transformation projects.

Current product portfolio under the Neckarshore AI brand:

Omnopsis Documenter — AI-powered documentation engine: generates compliance, technical, and release documentation from Git, Jira, and Confluence. 500+ automated tests, 100+ API endpoints, RBAC, monitoring stack.
TrustScope — trust analysis for public GitHub repos: deterministic three-pillar report (Security & Supply Chain, Governance, Community) based on OpenSSF Scorecard, with constructive fix suggestions instead of a single misleading score.
md-viewer — dependency-free Markdown viewer for macOS (Finder Quick Action) and web, split view of rendered document and raw text.
Obsidian Vault Autopilot — AI-supported vault automation for Obsidian × Claude Code: sorts the inbox, renames notes, enriches frontmatter.
Phonesis Voice Bank — voice archive for families, hospices, and cultural archives (guided recordings, inheritable archive, optional voice cloning); currently in the GDPR compliance phase (Art. 9, biometric data).
Multi-Agent Development Process — 12+ specialized agents (architecture, implementation, security, refactoring, marketing) with structured handoff protocol, parallel execution, and automated quality assurance — powers the entire product development.
Freelance consulting: Technical Product Ownership for production, logistics, and compliance/AML systems; steering international rollouts including test, cutover, and change management.

Stack: NestJS, TypeScript, PostgreSQL, Redis/BullMQ, Next.js, Claude Code (Opus), Docker, GitHub Actions, Vercel

Gildas D.

System Team Lead Diagnostics – Hybrid & Electric Drives (HEV/MHEV/PHEV) for Transmission and Engine (NA/SA)

Eberdingen

Last position:

System Team Lead Diagnostics – Hybrid & Electric Drives (HEV/MHEV/PHEV) for Transmission and Engine (NA/SA) at Stellantis e-transmission

Technical lead of diagnostics activities for eDCT transmissions and drive systems in the area of hybrid (HEV), mild-hybrid (MHEV), and plug-in hybrid vehicles (PHEV)
Responsibility for the development and validation of DTC strategies (OBD / EOBD) for markets in North and South America and the EU
Coordination between interdisciplinary teams (system development, software, safety, calibration, after-sales)
Creation and maintenance of diagnostic specifications (DID, DTC matrix, snapshot, freeze frame) according to STLA standards
Support with troubleshooting, validation tests, EOL processes, and internal audits
Technical interface to suppliers (Bosch, Valeo, etc.) in the area of actuators, sensors, and electric pumps
Creation of diagnostic RFQ

Deepak N.

Consultant

Asperg

Last position:

Consultant at Advantest Europe Gmbh

Develop hardware drivers and middleware using C++11, Java and Python
Design of various RF features such as deembedding based on stakeholder requests
Work with multiple teams to design drivers for multiple RF products
Perform HW control to deliver RF signals and measure modulated response
Develop RF drivers for generation of low noise signals to test WiFi7 products
Use digital modulation techniques such as QAM for low level driver development
Develop low level USB drivers for device enumeration
Develop drivers for HW relay control of control boards for device testing
Perform JTAG operations on devices under test
Use network-based protocols (SFTP, UFTP, FTP, SSH) for control board communication
Manage HW devices such as BADC and EEPROM for control board maintenance
Utilize C++11/14/17 features, template metaprogramming and STL
Employ multithreading for testing and control of multiple HW devices
Develop tools for deployment of customer OS on control boards
Perform component and integration tests using CxxTest
Follow Scaled Agile Framework for software development
Create detailed design documents using PlantUML

Wael M.

Test Manager

Waiblingen

Last position:

Test Manager at Schwarz IT

Design, planning, and test case analysis
Integration testing
Coordination of UAT in the lab and on site
Creation of HW and SW test catalogs
Communication of test results from REST services with the SAP team
Support for branches in the EU until rollout
Coordination of defect management and SW updates with the involved vendors
Checking the configuration of the charging stations in the backend software for different countries
Continuous reporting of the quality status to project management
Documentation of the user manual in English and German
Tools: Confluence, be.Energised, OCPP Postman, OPI, CCV (payone.elavon), Excel, it4you

Carlos M.

Implementation in Pimcore/Shopware

Last position:

Implementation in Pimcore/Shopware

Consulting, design, analysis, software architecture and development
Designing, developing, and implementing a Pimcore environment and connecting multiple external API systems in a Kubernetes environment, as well as various PIM and ERP systems
Technologies: Unix environment, design, Symfony development, PHP 8+, software architecture, MySQL/SQL, shell scripting, Git DevOps tasks, AI coding support, Pimcore 12, Shopware 6
Team size: >10 people

Albert F.

Lead Product Owner

Last position:

Lead Product Owner at CMBlu Energy AG

Lead Product Owner for 4 development teams
Leading and coordinating a greenfield project with parallel implementation of core components by independent teams; managing dependencies and resources
Establishing a data lakehouse approach, including analysis of data volumes and future requirements as part of a cloud migration (best-of-breed approach)
Responsible for requirements analysis, selection, and piloting of a LIMS/ELN system, supported by advising decision-makers and managing external vendors
Introducing and managing an OpenWeb UI and Azure OpenAI-based RAG system to support knowledge extraction and data-driven analyses
Setting up, configuring, and managing Jira projects, as well as developing project-specific workflows and automations
Implementing classic Scrum processes with all ceremonies and taking on the Scrum Master role for all involved teams
Assisting in hiring through interviews and assessments from a product owner's perspective
Making key architectural decisions, including selecting the platform for the data lakehouse (Databricks) and the strategic integration of LIMS and analytics platforms

Pierre-Jean A.

BI and Mechatronic System Development

Last position:

Verification Engineer – Aviation at Tri.Merge GmbH

Automated Python-based analysis of test script repositories
Built a SQLite database for signal and value tracking
Identified critical discrepancies with ad-hoc SQL queries
Technologies: Python, SQLite, Excel/ODBC

Lothar H.

Solution Manager for PoC investigation and for replacing and refining an existing cloud and IoT power plant control system

Ditzingen

Last position:

Solution Manager for PoC investigation and for replacing and refining an existing cloud and IoT power plant control system at Shell AG and NEXT Kraftwerke GmbH

Investigating the PoC and replacing and refining an existing cloud and IoT power plant control solution for certificate management of renewable energy plants (solar, wind, biomass, etc.) for the largest European renewable energy network operator, including examining the field IoT devices and their integration and network connections, aiming for 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 & Confluence
Evaluation of pub/sub message streams for MQ and Kafka.
Various tests with “best design approaches” for resilience patterns like circuit breaker designs, throughput measurement and monitoring, bulkhead governors – for robust EA design
Integration of API management with IBM's API Connect to Kubernetes for platform-agnostic microservices API management designs. Google Apigee
Solution health check approaches for load burst situations + remedy
Research and evaluation of potential sub-service providers in the coordinating role as solution manager. CIS20 controls.
DREAD and STRIDE security assessments.

Benjamin S.

Design and implementation of a new cloud service

Esslingen am Neckar

Last position:

Design and implementation of a new cloud service at Porsche AG

Design of a new cloud service
Requirements Engineering
API Design (REST API, Kafka)
Consulting on architecture, feasibility and effort estimation
Implementation of a microservice architecture
Implementation of a Spring Boot web service
Development of REST APIs including business and persistence logic
Kafka consumers and producers
Various Excel upload/download scenarios
Change Data Capture
Cloud provisioning with IaC/Terraform
Go-live with 30,000 users
Operation, support and bug fixing for other services

Environment/tools: GitLab, JIRA, Confluence, IntelliJ, Spring Boot, Java, Docker, Terraform, AWS ECS, Postgres, Apache Kafka, SAP Datasphere, JUnit, Debezium, Apache POI, Hibernate, JPA, Testcontainers

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

Ronald F.

IT Consultant & Training

Last position:

IT Consultant & Training at Various Small Projects & AI Training

Development of multiple websites for small businesses (6)
SEO/SEM
Business Consulting (Implementation of ERP systems (Fresha / MS Dynamics))
AI Tooling, Prompting & Coding
GenAI Chatbot (GPT 4.0)
Creation of a telephone agent (NLP services, Twilio, Python, Azure Services)
Python coding, report & dashboard creation
Stakeholder management and consulting throughout the project lifecycle

Training and Certifications in AI:

Microsoft Azure AI Fundamentals
Develop Gen AI Solutions with Azure Open AI Service
Designing and Implementing a Microsoft Azure AI Solution
Artificial Intelligence for the Business Professional
Generative AI for the Business Professional
Certified Artificial Intelligence Practitioner

Ivan G.

Technical Lead

Last position:

Technical Lead at Porsche Digital GmbH

Contributed to the design of the new financial services integration layer and moderated the architectural discussions
Oversaw the security concept and approval of the application
Prepared infrastructure setup and best practices for the Kotlin backend

Alban T.

C/C++ Developer on AIX Systems for SAP Kernel System Integration