Ioanna's Portfolio

Software Engineer Intern, October 2020 - April 2021 and Back End Developer, April 2021 - present, for Logicea, LLC.
- Led a team of 3 back-end developers to build a secure, high-performance e-SIM purchasing platform, integrating third-party APIs and ensuring high availability and compliance with industry standards.
- Designed and implemented a multi-market, large-scale advertising management platform using Spring Boot, Kotlin, and Node.js, improving campaign setup speed and cross-market scalability.
- Maintained and enhanced core features of a knowledge-based browser game (Java, Spring Boot, PostgreSQL, Redis), serving thousands of daily users with minimal downtime.
- Developed RESTful APIs across multiple projects, following OpenAPI standards and ensuring maintainability and scalability.
- Conducted code reviews, established coding best practices, and mentored new back-end interns to promote code quality and team growth.
- Collaborated closely with front-end developers, designers, and product managers in agile ceremonies (sprint planning, retrospectives, daily stand-ups).
- Authored internal documentation and user guides using Confluence and OpenAPI.
- Contributed to recruitment by reviewing CVs, conducting interviews, andonboarding junior talent.
Volunteer Software Developer for SciFY Not-for-Profit Company, April 2017 - December 2017.
Cause: Human Rights
Our main goal was to ameliorate the gamesfortheblind.org site, so that it would be easier to access for both visually impaired people and the rest. We mainly worked with WordPress for this goal, and used Slack for our communication and Trello for managing our tasks.
Volunteer IT Support for the Technical Chamber of Greece, November 2016.
Cause: Civil Rights
IT support for the elections of 2016. My main duties revolved around handling the voters' system, mark them as voted or absent, select the required voting paperwork for them and handle my team's requests on the system (e.g. printing and logging activities).

Skill	Specifics
Programming Languages	Java (Spring, Spring Boot), Kotlin C, C++, Python
DevOps & Cloud Tools	AWS, GitLab CI/CD, Jenkins, GitHub actions
Databases	Relational (MySQL, PostgreSQL), NoSQL (Redis, MongoDB)
API & Development Tools	Git, RESTful APIs, OpenAPI
Testing Tools	JUnit, Mockito, Postman
Security	OAuth2, JWT
Architecture Knowledge	Microservices, Event-driven design
Project Management & Collaboration	Team leading, Jira, Trello

Language	Level
Greek	Native
English	Certificate of Proficiency in English (University of Michigan), First Certificate of English (University of Cambridge)
French	Delf, niveau B2
Spanish	State Certificate of Language Proficiency (ΚΠγ), level B2 (intermediate)

Hello World! I am Ioanna.

Hello World!
I am Ioanna.

About Me

My Previous Experience

Educational Background

Skills

IT Skills

Languages

My Projects

Java Projects:

AI/Prompting Projects:

Web Development Projects:

Machine Learning:

Applications (with imperative and object oriented implementations):

Databases - Usage and Design:

Databases - Implementations:

Graphics:

Other Programs:

Seminars - Certifications

You can find me all around the web on the following links:

Made with and in Greece

© Ioanna Zapalidi