Yasin Yildiz-DevOps Architect & Backend Developer

Task:

• Architecture and further development of the DevOps infrastructure in a regulated environment
• Migration, planning, and development from monolith to microservices (ASP.NET Core)
• Implementation of a GitOps-based deployment strategy with Argo CD: full synchronization of all Kubernetes manifests from Git, automated rollbacks, and use of the application-of-applications pattern to manage multiple environments (Dev/Staging/Prod).
• Build and maintain CI/CD pipelines (GitLab, Jenkins) to support agile development
• Manage artifact repositories with JFrog Artifactory and security scans via Xray
• Migration and integration of source code repositories (SVN → GitLab)
• Operation and configuration of a container platform with OpenShift
• Automate deployments with Ansible, Helm, and Ansible Automation Platform
• Implement monitoring and alerting solutions with Prometheus
• Provision OpenStack resources through Terraform
• Close collaboration with frontend development teams to improve build, test, and release processes
• System architectures (microservices, container architectures)
• Build an internal AI with agents
• Support the establishment of secure and scalable infrastructure processes (Secure SDLC)
• Documentation and knowledge sharing within the team
• Lead refinements and design the architecture for the backend

Technologies: JFrog Artifactory, Xray, Gitlab, Jenkins, SVN, OpenShift (Kubernetes), ASP.NET Core, C#, Prometheus, OpenStack Ansible, Terraform, ArgoCD, Ansible Automation Platform, OpenStack Helm, GitOps, VMware, VMware Aria Operations, Citrix, CISCO, Langfuse, Python, fastApi, ollama

Task:

• Build and design a platform
• Develop and implement knowledge of secure software architectures (risks, patterns)
• Document and analyze business-critical processes / business process analysis
• System architectures, distributed systems together with microservice structures
• Containerization with Podman
• Python scripting for tests
• Stakeholder management
• Create and lead the internal infrastructure
• Coordinate a platform team
• High availability, load balancing, and certificate management via Istio
• Develop ITILv3 processes
• Develop several security concepts
• Connect IAM to applications via LDAP (Gitlab, Aramis SMA)

Technologies: Podman, Gitlab, Linux(Rhel), Windows, VM, Python, Sql, FTP, Istio, Sas, Cisco, Citrix Workspace, Mattermorst, CheckMK, Git, Windows Server, ITIL, Kanban, DNS, LDAP, IAM

Activities:

• Designing pattern mechanisms for handling requests
• Documenting and analyzing business-critical processes / business process analysis
• As a result, design & modeling (OOA/OOD, UML, BPMN)
• Containerizing with Docker
• Implementing a GitOps-based deployment strategy with Argo CD: full synchronization of all Kubernetes manifests from Git, automated rollbacks, use of the Application-of-Applications pattern to manage multiple environments (Dev/Staging/Prod).
• Integration architectures (ESB, REST, Messaging)
• EAM frameworks Zachman
• Pipelines with GitLab CI/CD (e.g. for building, testing and deploying a containerized (Docker) application or building a Spring Boot application as a dependency versioned and stored in the GitLab Package Registry as a JAR or as a Docker container in the Container Registry)
• Building and running the internal infrastructure
• Developing ITILv3 processes
• Ansible to install and configure VMs and Terraform to provision OpenShift resources
• Coordinating 3 teams for 6 projects

Technologies: Java, JavaEE, Kotlin, Apache, Tomcat, Spring, GitLab, GitLab CI/CD, Docker, ITIL, Kafka, GitOps, ArgoCD, Kubernetes(OpenShift), Terraform, Apache, Linux(Rhel), Ansible, Hibernate, JPA, SAP 4 Hana, Splunk, Git, Scrum, OAuth2

Activities:

• Development of serverless functions in AWS Lambda & Cloudfront Functions
• Restructuring a Terraform monolith, moving out modules and implementing workspaces
• Ansible playbook for provisioning customer and developer accounts
• Integration architectures (REST, Messaging)
• Extended routing tables
• Development of a Java Spring Boot API
• the developed applications in AWS Elastic Kubernetes Service (EKS)
• Storage and persistence in Elastic Search and Amazon RDS
• Certificate management with Istio
• Pipelines with GitLab CI/CD (e.g. for building, testing and deploying a containerized (Docker) application or building a Spring Boot application as a dependency versioned and stored in the GitLab Package Registry)
• Setting up DNS, file servers
• Mirroring and snapshot backups of files
• Implemented Grafana and created dashboards.
• Extended OIDC in Spring Boot with OpenId (claims & scope adjusted)

Technologies: AWS, EKS, Lambda, GitLab, Jenkins CI/CD, Java, Spring Boot, Hibernate, Jpa, Ansible, GitOps, Cloudfront, Terraform, Elastic Search, RDS, Linux(Rhel, Arch, KLinux), Docker, OpenShift, Grafana(Mimir, Operator, Loki Runbooks), Prometheus(Alerting Rules), Scrum, Tenant Lifecycle Management, Istio, AWS IAM, OIDC

Activities:

• Development of a Spring Boot REST API in Java to calculate securities trading returns
• Using GitLab CICD for deployment of applications on AWS Cloud
• Cloud infrastructure: managed MySQL database (AWS RDS), AWS S3 bucket, Elastic Load Balancer, virtual machine (EC2), AutoScalingGroup
• Using Terraform for provisioning resources
• Server configuration with Ansible
• Build, test and deploy as a containerized (Docker) application in AWS ECS with GitLab CICD
• Extended AWS IAM & RBAC
• Implementing robust backup and recovery processes for trading data in AWS S3 buckets and managed MySQL databases (AWS RDS) to ensure data availability and security. Improvement of the
• Expanded use of monitoring tools such as AWS CloudWatch and Grafana to monitor the performance of trading systems (securities, ETFs, etc.) and to detect anomalies at an early stage.
• Hands-on development of requirements analysis with the customer
• Coordinating the infrastructures and processes to enable software deployments, as well as the team (9 people)

Technologies: REST API, Python, Java, JavaEE, Jakarta, Kotlin, Spring Boot, Ansible, Terraform, GitLab, AWS IAM, Jenkins, AWS, ECS, Docker, Postman, Microservices, Terraform, Grafana(Mimir, Loki, Runbooks), Prometheus(Altering Rules), Apache, Tomcat, Scrum, OAuth2, RBAC

Tasks:

• Containerizing microservices with Docker
• Designing and developing graphical mockups, databases, and the project roadmap
• Creating CICD pipelines with GitLab CICD
• Developing a Python tool to speed up development
• Preparing document management for EPA (OCR print scan)
• Using Artifactory to manage software artifacts
• Ensuring good practice in the DevOps process by using SonarQube

Technologies: Python, Docker, CICD, GitLab, JFrog Artifactory, SonarQube, Linux (Ubuntu), Kanban

Tasks:

• Responsible for all CICD pipelines for the development teams, resulting in software artifacts being delivered much faster and with fewer errors
• Azure DevOps / Azure Pipelines for creating CICD pipelines, Azure Repos for managing Git repositories
• Supported Asp .Net Core backend

Technologies: Azure DevOps, Git, C++, Python, Asp .Net Core, CICD, Linux(Ubuntu), Scrum

Tasks:

• Frontend web development with Angular and Ionic
• Implemented support team requirements in individual Angular components
• Frontend testing with Cypress
• Extended customer JSF projects
• Developed UML diagrams for internal company processes
• Backend development with Nest.js and Node.js
• Designed database models in NoSQL

Technologies: TypeScript, Angular, Bootstrap, Node.JS, Nest.JS, Mongoose, NoSQL, CI/CDI, Cypress, Gitlab, Jira, Confluence, Postman, Docker, NPM, Linux, Scrum, JavaEE, JSF, UML