Professional Experience#

Key Responsibilities#

• Actively maintaining & developing 3 core platforms:

  • DXL (Digital Xperience Layer): A Quarkus middleware with 200+ microservices
  • Ecommerce Platform: A Spring Boot platform with 30+ microservices
  • Retail 10: A Monolith “under deconstruction and modernization” - agent-based platform for physical shops

• Providing technical supervision and architectural leadership across three Agile teams (4–7 members each)

• Researching & investigating meaningful AI integrations, exploring LLM MCP functionalities

• Providing continuous knowledge transfer through biweekly trainings, presentations, and colleague mentoring

Technologies: Microservices, GitHub Actions, Jenkins, Spring Boot, Quarkus, Docker, Solr, AWS, Kubernetes, Kafka, PostgreSQL, Swagger, OpenSearch, ArgoCD

Impact#

• Led architectural modernization of legacy systems across enterprise
• Established knowledge-sharing culture through structured training programs
• Transformed deployment pipeline to modern CI/CD practices

Key Responsibilities#

• Built from scratch & maintained the new e-commerce platform for Vodafone Greece
• Led the back-end chapter with full responsibility for development and implementation (during chapter lead absence)
• Presented reactive programming approach using Spring & WebFlux at Devstaff 2023 meeting
• Endorsed Quarkus adoption as middleware technology, explaining advantages of compile-time augmentation vs runtime loading for cloud environments
• Demonstrated and implemented fully automated CI/CD with GitHub Actions POC
• Migrated significant portion of legacy Jenkins stack to GitHub’s integrated CI/CD platform
• Implemented local AWS development environment using LocalStack mock and K8s cluster
• Created aspect-oriented solution leveraging reflection to demonstrate internal Spring Boot aspects
• Interviewed and trained junior/mid developers

Technologies: Spring Boot, Spring WebFlux, Quarkus, AWS, Kubernetes, GitHub Actions, Jenkins, LocalStack

Impact#

• Successfully launched new e-commerce platform from zero to production
• Reduced CI/CD complexity through platform migration and automation
• Improved local development experience with AWS mock environment

Key Responsibilities#

• Participated in backend chapter decommissioning the old ecommerce platform
• Implemented various components of new e-commerce cloud infrastructure, emphasizing DevOps skills on AWS/EKS cluster
• Created POC for OpenTelemetry usage in microservices tracing using Splunk OTel/agent for log/tracing integration
• Developed SQL triggers to automate database processes upon CRUD operations (e.g., virtual table/view generation)
• Integrated Solr with AWS OpenSearch to provide indexing and searching on general cluster (document DB) for multiple organization clients
• Presented demonstration on building annotation-based web framework using plain Java (“Virtual Octopus Server”)
• Designed and documented exposed APIs using Swagger (OpenAPI)

Technologies: Spring Boot, AWS EKS, Solr, OpenSearch, OpenTelemetry, Splunk, PostgreSQL, Swagger, Docker, Kubernetes

Impact#

• Enhanced observability through OpenTelemetry integration
• Improved search capabilities via Solr-OpenSearch integration
• Streamlined API documentation and development workflows

Key Responsibilities#

• Part of payroll engine team developing and maintaining multi-million revenue product
• Multi-role player in payroll’s abstractions team
• Developed various containerized APIs to expose engine functionality to clients/projects (Spring Boot, Spring REST, Spring HATEOAS, Docker)
• Fully developed 2 sub-projects independently to improve team workflow:
  • IntelliJ plugin (Java & Gradle): Safety mechanism for committing on older CVS branches with outdated binary files
  • .xls searcher (Java & Apache POI): Simplified business rules search through Excel files
• Led implementation and major refactors of collective agreements according to law amendments, applying proper OOP design patterns
• Parametrized and utilized Jenkins for continuous integration automation
• Maintained code across multiple version control systems (Git, SVN, CVS) on both Windows & Linux environments

Technologies: Java EE, Spring Boot, Maven, Drools, Wildfly, Jenkins, Git, SVN, CVS, Oracle DB, PostgreSQL, Docker

Impact#

• Improved developer productivity through custom tooling (IntelliJ plugin, Excel searcher)
• Maintained code quality during legal compliance updates
• Automated deployment processes reducing manual effort

Key Responsibilities#

• Provided assistance in software optimization and maintenance of army’s drone micro-controllers (C/C++)
• Developed fully functional Qt/C++ desktop application for military-files handling, reducing search complexity in raw documents
• Optimized scripts to automate transformation of income messages in private network into .xls data
• Completed communication systems operator training
• Honored by army general with “excellent service” award

Technologies: C/C++, Qt, Network Systems, Shell Scripting

Achievements#

• Received “excellent service” award from army general
• Delivered critical file management system under tight security requirements

Key Responsibilities#

• Detected and solved various problems on electronic devices, focusing on hardware domain
• Specialized in chipset, motherboard, and graphics card restoration
• Tracked and saved data relevant to restored products on Unix CLI-based application
• Performed administration role on Unix CLI-based supply information system

Technologies: Hardware Diagnostics, Unix CLI Systems