Stefanos Psyllas
Hi, I’m Stefanos Psyllas, a software engineer specializing in backend development with nearly 3 years of hands-on experience.
About
Hi, I’m Stefanos Psyllas, a software engineer specializing in backend development with nearly 3 years of hands-on experience. I enjoy building reliable services and scalable systems, particularly with Java and Spring Boot, and I’m comfortable tackling complex challenges in production environments.
I focus on delivering end-to-end backend solutions, collaborating closely with product and DevOps teams, and continuously improving code quality through test-driven development and CI/CD practices. I’m always eager to learn and apply new technologies to real-world problems, especially in the realm of distributed systems and microservices.
- 3 years' experience
- Joined April 2026
Industry experience
- Software & Internet
- Professional Services
Work experience· 4 roles
Engineered Java/Spring Boot microservices for international B2G welfare and taxation systems, managing end-to-end feature delivery and client change requests. Orchestrated complex business logic with Drools and Camunda BPMN, and utilized Liquibase to manage database schema evolutions in Oracle SQL environments. Maintained high system stability through comprehensive unit testing and refactoring within an Agile/DevOps workflow using Azure DevOps and GitLab.
Engineered Java/Spring Boot microservices for a high-traffic international B2G welfare and taxation platform, delivering end-to-end features and handling client change requests. Implemented scalable backend logic using Kafka, Drools, and Camunda; orchestrated CI/CD with GitLab/Jenkins; ensured database evolution in Oracle SQL environments with Liquibase.
Engineered backend customizations for a dedicated-insta SaaS platform, developing client-specific modules and functionality tailored to public institutional (B2G) requirements. Maintained consistent version control and deployments across environments to support rapid feature delivery.
Education
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