Sercan T.-Certified Professional for Software Architecture Foundation Level

• 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.

• Focus: Architecture, Java backend, integration architecture
• Creation of architecture artifacts, process descriptions, BPMN and UML use case diagrams, and user stories for FIONA/LAIS.
• Development and maintenance of the FIONA system for the electronic support of funding applications.
• Integration and further development of interfaces with Apache ActiveMQ and other messaging technologies.
• Implementation of messaging and integration architectures with Apache Camel, Kafka, and RabbitMQ.
• Work in SAFe-based program structures with PI Planning and cross-team coordination.
• Development of functions for capturing, processing, and validating area information using aerial images and GIS technologies.
• 2nd-level support, incident analysis, root cause analysis, and go-live support.
• Operations and further development of containerized applications with Kubernetes and OpenShift.
• Application management
• Release changes
• Certificate creation/management
• Technical operational support
• Incident management
• Deployment support
• Requirement specifications / technical specifications

Technologies & methods: Java 11, Hibernate, Hibernate Performance, Hibernate Envers, Liquibase, REST, JSF, JSF WebFlow, MapStruct, Maven, ANT, Spring ecosystem, BPM, PrimeFaces, architecture patterns, Git, Bitbucket, pipelines, CI/CD, Confluence, JUnit, Scrum, OAuth2, Keycloak, OpenAPI / Swagger, DevOps, Fullstack, SAFe, AsyncAPI.

• Focus: Fullstack, microservices platform, cloud
• Contribution to the Scrum team in product maintenance and product enhancement.
• Development of a public API for integrating external partners.
• New development of an administration tool.
• Migration from Payara to Quarkus and microservices.
• Test automation with Cypress and JUnit.
• Operations and architecture of containerized platforms on Kubernetes and OpenShift.
• Maintenance of microservices in Spring Boot with Kotlin.
• Operations in cloud environments with AWS and Azure.

Technologies used: Kubernetes, Red Hat OpenShift, Docker, ANT, Prometheus, Grafana, JavaEE, Microprofile, Microservices, JEE patterns, TypeScript, Angular, PrimeNG, Hibernate, PostgreSQL, H2, Payara, Cypress, Kafka, RabbitMQ, Jenkins, MapStruct, Maven, Swagger, OpenAPI, EclipseLink, Spring Boot, architecture patterns, Kotlin, CSS, data communication and transaction protocols.

• Focus: Fullstack, Integration, Public Systems
• Development and testing of microservices for stakeholders from pension insurance, insurance companies and the public sector.
• Implementation of integration and messaging patterns with Apache Camel and message brokers.
• Operation and architecture of containerized platforms on Kubernetes.
• Support for communication between business applications and platform teams.
• Integration of messaging and processing pipelines in distributed system landscapes.
• Integration of modern frontend platforms and headless-oriented architectures based on decoupled microservices and APIs
• Development and execution of automated tests with JUnit, as well as support for quality assurance and error analysis.
• Participation in CI/CD processes and DevOps-oriented development workflows in a Git-based environment.
• Use of Jira and Confluence for requirements management, documentation and sprint planning.
• Development and integration of REST services and event-based interfaces with Kafka.
• Version control with Git and GitHub, as well as code reviews and build processes.
• Quality assurance and static code analysis with SonarQube, as well as artifact management via Nexus.
• Design and implementation of Event Driven Architectures based on Apache Kafka for communication between business applications and platform services.
• Development and further improvement of data and integration pipelines for processing and distributing business events in distributed system landscapes.
• Analysis of business requirements and translation into technical event and integration models.

Technology used: Kubernetes, Docker, Prometheus, Grafana, JavaEE, JEE patterns, MicroProfile, Microservices, Quarkus, OOA/OOD, Liquibase, Kafka, REST, Java, JUnit, TypeScript, JavaScript, React, Angular, CSS, npm/node, Stencil, Git, GitHub, Jira, Confluence, CI/CD, DevOps, SonarQube, Nexus, Karate, TOGAF model, Domain Driven Design, automated tests, OWASP, Arc42, BSI-TR-03107, cloud platforms, MapStruct, architecture patterns, Bitbucket, Loco, JMS / EAI (Apache Camel), data communication and transaction protocols, SQL Developer, SoapUI, Selenium, Eclipse, SVN, WebLogic Server.

• Focus: Backend, DevOps, Migration
• Transition to a multi-module build and JavaConfig.
• Analysis of business topics and individual stories.
• Migration from Spring Boot 1 to Spring Boot 2.
• Implementation of Spring Boot modules with Netty.
• Migration of more than 700 modules from Java 7 to Java 8, including technical migration planning, adaptation of build processes and release migrations.
• Implementation of communication and integration architectures in the public transport/mobility context.

Technology used: Java, Spring Boot 1/2, Spring Admin, Spring Cloud, JEE patterns, PostgreSQL, Docker, Jenkins, IntelliJ, Netty, Bamboo, Groovy, CI/CD, SVN, GitHub, OOA/OOD, offline capabilities, MapStruct, automated tests, data communication and transaction protocols.

• Focus: Backend, microservices, integration
• Implementation of Jira tickets and stories in a Scrum environment.
• Development, testing, and further development of microservices and backend modules based on Java and Spring Boot.
• Requirements analysis and creation of technical solution designs.
• Implementation of object-oriented analysis and object-oriented design (OOA/OOD).
• Design and implementation of distributed systems based on microservices and service-oriented architectures (SOA).
• Development and integration of REST and SOAP web services as well as Enterprise Application Integration (EAI) solutions for connecting heterogeneous systems.
• Design and implementation of Message-Oriented Middleware integrations (JMS) with Apache Camel for system and process integration.
• Analysis of business requirements and implementation of integration and interface concepts in an enterprise environment.
• Creation and execution of automated unit, integration, and system tests.
• Go-live consulting, quality assurance, and error analysis.
• Analysis of business topics and individual stories.
• Communication with business departments and documentation of results, interfaces, and services.
• Contribution to build, deployment, and CI/CD processes.
• Use of container technologies (Docker) for developing and deploying applications

Technologies used: Java 8, Spring Boot, Eureka, Spring Boot Admin, Solr, Angular 8, CSS, Node.js, Angular CLI, HTML, JMS / EAI (Apache Camel), SOAP-WS, REST-WS, JUnit, JMockit, IntelliJ, Selenium, Gradle, Spring Cloud, Docker, Microservices, GitHub, PowerShell, EAI , automated tests, Scrum, JEE-Patterns, CI/CD.

• Focus: Fullstack, SAFe, cloud and microservices architecture
• Planning, new development, and enhancement of web-based applications with Spring Boot 2 and Angular 6.
• Working in a scaled agile organization with multiple teams.
• Coordination of architectural decisions in the context of cloud and microservices architectures.
• Execution of developer tests and contribution to integration tests.
• Operation and monitoring of microservices architectures on AWS.
• Experience with headless CMS-related architectures and API-based portal platforms in the banking environment.

Technologies used: Java, TypeScript, Spring, Spring Boot 2, Spring Eureka, Spring Security, Seal One, SIA, Angular 5/6, RxJS, Microservices, PostgreSQL, offline capabilities, MongoDB, cloud platforms, Tomcat, Node.js, NPM, IntelliJ, TDD/BDD, Bitbucket, TOGAF model, Docker, Scrum, Mockito, JUnit 5, Spring Cloud, NgRx, MapStruct, AWS, CI/CD, gRPC, Liquibase, OpenAPI / Swagger, SAFe, Multicloud, Keycloak.

• Focus: Fullstack, module development, rollout
• Further development of an existing cPlace platform.
• Development and implementation of modules and features.
• Deployment and rollout.
• Analysis and application of software architecture.

Technologies used: Java J2E, IntelliJ, ElasticSearch, HSQLDB, MySQL, SQL, cPlace, Angular 2, CSS, JEE-Patterns, Tomcat, Jetty, Jenkins, automated tests, Jira.

• Focus: Fullstack
• Implementation and migration of use cases based on functional documents.
• Coordination of the interface between the JSF application and the mainframe.
• Work in a SAFe-oriented organization with several teams.
• Execution of developer tests and documentation of changes.
• Development and maintenance of applications in the IBM WebSphere Application Server environment.
• Execution of release changes and technical deployments.
• Support in 2nd-level support as well as incident analysis.
• Preparation of technical documentation and specifications close to requirements specifications.
• Design of security architectures including authentication, authorization, encryption, and PKI-related security concepts.
• Setup and use of central logging and monitoring solutions based on the Elastic Stack (ELK).

Technologies used: AngularJS, Sonar, JSF 2, JEE-Patterns, IBM WebSphere Application Server, jQuery, Eclipse Mars, REST-Webservice, Jersey, JSON, Jackson, PAI, J2EE 1.4, EJB 2.5, SAFe, Node.js, GitHub, CSS, Servlets, Struts, JEE 1.7, Azure, BITV, Design of security architectures including authentication, authorization, encryption, and PKI-related security concepts, setup and use of central logging and monitoring solutions based on the Elastic Stack (ELK).

• Focus: Backend
• Backend development and maintenance of the business-specific insurance software Syrius.
• Development and maintenance of Java Enterprise applications with Eclipse.
• Deployment and operation on JBoss/WildFly Application Servers.
• Support in the incident and error analysis process.

Technologies used: J2EE 1.4, Webservices (SOAP and REST), Docker, Eclipse, JBoss/WildFly, Jenkins, OOA/OOD, Jira, Confluence, Scrum, Oracle database, Git, GitHub, Subversion, JUnit, ElasticSearch, automated tests, MapStruct, Struts.

• Focus: Frontend
• Implementation of a uniform and continuous consulting software for the field sales force of an insurance company and building society.
• Design and implementation of the application based on a generic framework.
• Implementation of interfaces to agency and application systems as well as external calculation engines.
• Development of an innovative user interface for tablets and laptops.
• Development of a content library using approaches similar to a headless CMS for the flexible management of product and tariff content.

Technologies used: Java EE, Hibernate, GWT, Vaadin, Spring Framework, DB2, HTML/CSS, OOA/OOD, JUnit, WebSphere, Tomcat 7, Spring.