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I'm Vasileios Ntoumanis, a software engineer with a strong emphasis on backend development. I design, implement, and optimize scalable, high-performance systems. I have a proven track record delivering high-quality code and driving technical innovation in fast-paced environments. Based in Athens, Greece, I work with Java 17, Spring Boot, Quarkus, AWS, Kubernetes, Docker, and cloud-native architectures to build robust microservices and data pipelines.…I'm Vasileios Ntoumanis, a software engineer with a strong emphasis on backend development. I design, implement, and optimize scalable, high-performance systems. I have a proven track record delivering high-quality code and driving technical innovation in fast-paced environments. Based in Athens, Greece, I work with Java 17, Spring Boot, Quarkus, AWS, Kubernetes, Docker, and cloud-native architectures to build robust microservices and data pipelines.

Vasileios Ntoumanis

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I'm Vasileios Ntoumanis, a software engineer with a strong emphasis on backend development. I design, implement, and optimize scalable, high-performance systems. I have a proven track record delivering high-quality code and driving technical innovation in fast-paced environments. Based in Athens, Greece, I work with Java 17, Spring Boot, Quarkus, AWS, Kubernetes, Docker, and cloud-native architectures to build robust microservices and data pipelines.…I'm Vasileios Ntoumanis, a software engineer with a strong emphasis on backend development. I design, implement, and optimize scalable, high-performance systems. I have a proven track record delivering high-quality code and driving technical innovation in fast-paced environments. Based in Athens, Greece, I work with Java 17, Spring Boot, Quarkus, AWS, Kubernetes, Docker, and cloud-native architectures to build robust microservices and data pipelines.

Available to hire

I’m Vasileios Ntoumanis, a software engineer with a strong emphasis on backend development. I design, implement, and optimize scalable, high-performance systems.

I have a proven track record delivering high-quality code and driving technical innovation in fast-paced environments. Based in Athens, Greece, I work with Java 17, Spring Boot, Quarkus, AWS, Kubernetes, Docker, and cloud-native architectures to build robust microservices and data pipelines.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Greek, Modern

Advanced

Work Experience

Software Engineer at Scientific Games

December 1, 2023 - Present

Software Engineer at Scientific Games. Developed and maintained microservices and APIs for an Instant Game Engine, ensuring scalability, reliability, and seamless integration with external systems and internal services. Led Oracle database changes, including schema modifications and data migrations, to maintain high availability and consistent performance across environments. Implemented comprehensive unit and integration tests for ETL processes with JUnit to ensure error-free data loads and reduce production bugs. Contributed to consulting services for clients by analyzing business requirements and advising on design and implementation. Technologies: Java 17, Maven, Kafka, Docker, AWS, MySQL, Snowflake, Spring Boot, Hibernate.

Software Engineer at Ziggy Creative Colony

June 1, 2021 - November 1, 2023

Designed and implemented an ETL pipeline to collect data from multiple sources, enrich it, and store it in a data warehouse to improve data accessibility and consistency for business teams. Deployed and maintained cloud-native microservices (AWS ECS, EC2, MSK, Load Balancer) and implemented unit and integration tests for ETL processes using JUnit, ensuring robust data transformations and error-free loads across environments.