Microservices 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.

Salim Chehab

Cloud / Systems Architect

Last position:

Cloud / Systems Architect

Development and introduction of operational processes
Preparation of complete documentation packages (including emergency management and operations) to meet compliance requirements
Introduction of a workshop on IaC (Infrastructure as Code)
Professional consulting for the project's security concept (ISMS)
Installation and operation of Kubernetes clusters on AWS, on-prem, and Azure
Design of hybrid cloud architecture (on-prem, Hetzner, AWS)
Analysis and resolution of incidents and system outages
Network changes to firewall rules, gateways, OpenVPN settings, and IPsec tunnel (pfSense)
Professional 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

Artyom Narimanyan

Senior Software & Cloud Consultant

Ludwigsburg

Last position:

AI Automation Engineer & Solution Architect at Technology Research Project

Designed and developed an AI-powered automation platform using n8n to analyze social media niches, identify target audiences, and automate marketing strategy generation. The solution combined AI agents, workflow orchestration, and data analysis to automate research processes and generate data-driven insights.

Designed and implemented complex automation workflows using n8n
Developed AI-powered analysis agents for market and audience research
Integrated multiple APIs and AI services into automated workflows
Built automated market, competitor, and target audience analysis pipelines
Leveraged Large Language Models (LLMs) for information summarization, classification, and prioritization
Containerized and deployed the platform using Docker

Technologies: n8n, AI Agents, OpenAI APIs, Prompt Engineering, LLMs, Docker, Linux, REST APIs, Webhooks

Carlos Medina

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

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.

Achille Chimi

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

Benjamin Schaich

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

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

Marcel Schmidt

Technical Lead / Lead Developer

Ludwigsburg

Last position:

Technical Lead / Lead Developer at REWE digital

Due to an organizational restructuring towards product-based teams, the implementation of a Data Mesh in the area of Digital Supplier Management (DSM) was decided.
A highly available real-time Data Mesh for providing large volumes of data via Kafka and REST to other products.
New development of a core supplier management software in a (micro-)service-based architecture with a modern tech stack.
Technologies/Tools:
Java 21
Spring Boot
Angular
TypeScript
Go
MapR
Kafka
Docker
Google Cloud Platform (GCP)
Kubernetes
Helm
GitLab CI
Maven
JUnit
Mockito
WireMock
Cypress
Keycloak
OAuth 2.0 & OpenID Connect
Humio
Nexus
Artifactory
SonarQube
Renovate
Git
Postman
IntelliJ

Mangal Mahalinge

Test Analyst

Last position:

Trainee Product Management at Digitale Leute Schule

Remote learning with experts and 636 instructional units.
Product management bootcamp teaching agile methods and software tools for modern product management in complex software projects.
User experience (UX) · product management · Figma (software) · user-centered design · Scrum · agile project management · Jira · Confluence · product discovery · backlog management · user experience design (UED) · prototyping · lean thinking · product roadmapping · user stories · Miro collaboration platform · application monitoring tools · performance metrics · lean product management · product design kickoff indicators (KPI) & tracking events · product strategy · business modeling · product vision & goals · product discovery.

Ahmed Fikri

Senior Lead Engineer (Freelance)

Last position:

Senior Lead Engineer (Freelance) at Atruvia AG

Development of a wealth management application for investing in foreign currencies
Full-stack development with Angular, Spring Boot, OpenShift, Oracle DB, Kafka
Design and implementation of a microservice architecture
Integration into Atruvia's BWS system and connection of multiple interfaces between Atruvia and DZ Privatbank
Greenfield development of the application from the ground up
Technical responsibility for architecture and interface design
Close collaboration with business units and external stakeholders

Elvir Büyükbayrak

Software Architect and Software Developer