BPMN Experts in Stuttgart

Sercan Tatar

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.

Gildas Djomen

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

Robin Sadlo

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

Will Orrantia

Solution Architect

Esslingen

Last position:

Solution Architect at Stuttgart Police Authority

Designing the migration strategy for WLS applications to the BKA cloud and Stack IT
Creating a hybrid cloud for internal testing and development with Kubernetes
Transforming the IT landscape from a legacy monolithic architecture to a cloud-based architecture
Integrating new CI/CD processes using Azure Pipelines
Quadrupled the throughput of personnel security checks
Migrated personnel security clearance applications to Docker-based applications
Built CI/deploy pipelines with Azure DevOps
Environment: Java Spring Boot, Kubernetes, Oracle WebLogic, OpenID, Camunda, JUnit, TOGAF

Albert Frischmann

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

Lothar Hinsche

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.

Axel Zabel

Freelance Management Consultant

Bietigheim-Bissingen

Last position:

Freelance Management Consultant at Freelance Management Consultant

Advising companies and institutions in the areas of customer service, customer experience, customer centricity, user journeys, CRM strategy, operations, digital banking, payments, and energy
Selection and implementation of CRM systems
Selection and implementation of billing/ERP systems
Selection and implementation of omnichannel systems
Selection and implementation of knowledge management systems
Interim manager (COO, CCSO)
Project management for CRM and IT projects as well as software rollouts
Incident management (leading task forces)

Thomas Arends

Interim Assignment

Wernau (Neckar)

Last position:

Interim Management at Vincorion Power Systems GmbH

Process and project management to optimize products and development processes for energy systems
Technical risk management
Requirements engineering and system architecture
System FMEA of power generator units and energy storage modules aiming for generic structures
Claims management according to Section 313 of the German Civil Code
Regulatory environment: military and NATO standards, AQAP, VG norms

Ronald Foerster

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

Noah Habtom

Senior Consultant| Business Process Management

Waiblingen

Last position:

Organizational Development

Ongoing overall project for organizational development, process, and change management at a medium-sized company.

The starting point was an unclear organizational structure with missing role responsibilities and undocumented workflows in logistics, sales, and project management. During the project, As-Is processes are captured, modeled in BPMN, and systematically analyzed for optimization potential. At the same time, roles and responsibilities are clarified and a viable organizational structure is established. To-Be processes are developed and implemented together with the departments based on the analysis results. An accompanying change management program ensures that managers and employees remain actively involved and that changes do not bypass operations.

Elvir Büyükbayrak

Software Architect and Software Developer

Last position:

Software Architect and Software Developer at Noctica IT GmbH

NocTime time tracking, workshop planner, meal delivery service app
LLM-based chat bot to control the NocTime time tracking system via voice input
New and further development of customer solutions based on the Noctica SAS app framework
Technologies: Java 17, Spring Boot, JPA, Hibernate, JavaScript, TypeScript, Angular 20, Angular Material, React, C#, Docker, Bash, Git, GitLab, RedMine, SQL, DBeaver, MariaDB, PostgreSQL, Python, TensorFlow, Ollama, various LLMs

Dean Rakic

CEO / Chief Scientist

Last position:

CEO / Chief Scientist at ENUM

Blockchain platform technology
Blockchain digital platform / Digital Economy.

Marcel Kleber

Process Optimization and Solution Architecture

Asperg

Last position:

Freelance at Kleber Digital Consulting

Michael Schick