Summary
Overview
Work History
Education
Skills
Timeline
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Cesar Chatzikypris

Software Engineer
Athens

Summary

Results-driven software engineer with over 6 years of experience in software development, collaboration, and continuous improvement. Expertise in maintaining high code quality, contributing to comprehensive testing processes, and thoroughly documenting projects to ensure clarity and efficiency. Recognized for adaptability and a strong commitment to meeting deadlines while fostering a positive team environment. Passionate about leveraging technical skills to drive innovation and enhance project outcomes.

Overview

6
6
years of professional experience
4
4
Languages

Work History

Software Engineer

Sphynx
11.2024 - Current
  • Designed and implemented a centralized logging and notification platform using Kafka/Kafka Streams, Logstash, OpenSearch, OpenSearch Dashboards, and a custom Java library, enabling structured log aggregation, audit trails, and real-time WebSocket notifications.
  • Developed a flexible questionnaire framework powering assessments with customizable scoring and a DTO-based architecture ensuring maintainability and testability.
  • Developed a real-time notification service integrated with OpenSearch and WebSockets, supporting structured and queryable notifications.
  • Trained multiple teams and drove large-scale refactorings, introducing coding guidelines, testing strategies, and architectural best practices across projects.

Software Engineer

Sword Group
11.2021 - 11.2024
  • Developed microservices exposing gRPC/RESTful APIs.
  • Created and maintained unit/integration tests.
  • Implemented and maintained DTO/model/XSD/Proto validations.
  • Extensive experience managing Elasticsearch data, including creating and editing indexes, configuring custom mappings and settings, and optimizing for efficient search and retrieval.
  • Refined and generated ElasticSearch queries (native/elasticSearchOperations).
  • Contributed to the operation and maintenance of a Kafka system by creating topics, developing producers and consumers, and performing ongoing maintenance and support of the topics.
  • Enhanced data security for Kafka messaging by implementing robust encryption/decryption functionality.
  • Orchestrated scheduler service implementation and maintenance of diverse jobs for task automation.
  • Designed and implemented a centralized audit log system for multiple microservices.
  • Conducted cryptographic operations and facilitated communication with an external hardware security module.
  • Managed SonarQube for bug detection, code smell analysis, and test coverage optimization.
  • Addressed OWASP vulnerabilities and established suppressions where necessary.
  • Utilized Apache Ignite for basic operations.

Software Developer

Cognity S.A
11.2019 - 07.2021
  • Designed and implemented new features in Java with Spring Boot, enhancing the functionality of the system.
  • Developed microservices exposing RESTful APIs.
  • Maintained and enhanced existing code and MongoDB schemas.
  • Created and maintained unit/integration tests.
  • Created Kafka producers and consumers, modifying existing Kafka models.
  • Maintained and enhanced the local deployment process using Tilt, promoting a more efficient local development environment.
  • Provided ongoing support to Testers/DevOps.

Education

Technology of Software and Intelligent Systems: Informatics

University of Piraeus
06.2019

Skills

Proficient in object-oriented design and clean coding practices

Extensive experience with Java (17), Spring Boot, and JPA/Hibernate for building scalable microservices

Proven expertise in Kafka/Kafka Streams/Flink and Elasticsearch, contributing to efficient real-time data processing and search functionalities

Strong background in microservices architecture and designing REST/gRPC APIs

Database experience with PostgreSQL (pgAdmin), MongoDB, MySQL, and SQLite

Hands-on experience with Quarkus for Kafka Streams and lightweight microservices

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Timeline

Software Engineer

Sphynx
11.2024 - Current

Software Engineer

Sword Group
11.2021 - 11.2024

Software Developer

Cognity S.A
11.2019 - 07.2021

Technology of Software and Intelligent Systems: Informatics

University of Piraeus

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Cesar ChatzikyprisSoftware Engineer