Full-Stack Engineer

GeorgeTournakis

Enterprise platforms by day, freelance products I architect and lead by night — full-stack across Spring Boot (Java) and React / Next.js.

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01

About

I'm a full-stack developer who enjoys building things end to end — from the database to the interface.

At QnR I work across the stack on enterprise platforms for government clients. On freelance projects I take the architect / principal developer role, moving between the database, the backend and the front end depending on what a project needs most.

Over the past year I've focused on the backend — Spring Boot, JPA and a handful of certifications — while keeping up the front-end work I started with. I enjoy the less glamorous parts too: data models, integrations and edge cases, the things that usually decide whether something works.

At a glance
Currently
Engineer @ QnR
Focus
Spring Boot · React
Freelance
Architect / Principal
Open to opportunities
02

Selected Work

In developmentFreelance · 2026

CITEA

Architect / Principal Developer

A luxury Athens real-estate platform — sales, long leases and holiday rentals — built around a proprietary market-data engine.

Spring Boot 3Java 21Next.js 16PostgreSQL · PostGISFlyway+2
In developmentFreelance · 2026

CatchUP

Architect / Principal Developer

A multi-channel booking & AI-messaging platform for small service businesses — WhatsApp, SMS and voice, answered by an AI that books for them.

Next.js 16SupabaseAnthropic AI SDKVercel AI SDKTelnyx+2
EnterpriseQnR · 2026

DDDY

Full-Stack Engineer · backend focus

Built for the Directorate of Public Property Management in Greece — a workflow-driven platform for applications, approvals, e-auctions and payments.

Spring BootOracleLiquibaseNext.jsDIAS / GSIS
In productionQnR · 2025

Invoicing System — COSCO / OLP

Full-Stack Engineer · backend focus

Spring Boot middleware that forwards invoices and POS receipts to the EU PEPPOL e-delivery network for COSCO / OLP (Piraeus Port Authority).

Spring Boot 2.7Java 11MavenOracleJPA · Hibernate+1
EnterpriseQnR · 2026

Elsyn

Full-Stack Engineer · backend focus

For the Hellenic Court of Audit — built the platform's reporting layer: SQL views, JRXML templates, backend services and a role-aware report front end (rendered by JWT role + selection).

Spring BootJasperReportsSQL viewsReactJWT
LiveHellenic Navy · 2023

Naftiko Fylladio

Front-End Developer

A naval service-record web application for the Hellenic Navy — taken from critical issues to a clean public launch.

ReactJSNode.js
03

Experience

  1. Quality & Reliability (QnR)

    Jul 2024 — Present

    Software Engineer

    • Full-stack delivery across Spring Boot (Java) and React / Next.js for enterprise clients.
    • Built backend services, database views and UIs for government platforms.
    • Shipped and maintained React Native features for two production mobile apps.
  2. Grandmama

    Oct 2022 — Jul 2024

    Junior Frontend Developer

    • Built interactive ReactJS dashboards and reusable component systems.
    • Optimised front-end performance and the existing codebase for scale.
04

The Stack

Spring BootNext.jsPostgreSQLReactJava 21SupabasePostGISAgentic AITypeScriptOracleSpring BootNext.jsPostgreSQLReactJava 21SupabasePostGISAgentic AITypeScriptOracle

Languages

  • Java
  • TypeScript
  • JavaScript
  • SQL
  • C++

Backend

  • Spring Boot
  • Spring Security
  • JPA / Hibernate
  • Node.js
  • REST APIs

Frontend

  • React
  • Next.js
  • React Native
  • Tailwind CSS
  • HTML
  • CSS

Data

  • Oracle
  • PostgreSQL · PostGIS
  • Supabase
  • SQL
  • PL/SQL
  • SQL views
  • Stored procedures
  • Triggers
  • Query tuning

Tooling

  • Maven
  • Liquibase
  • Flyway
  • Git
  • Docker
  • Testcontainers
  • JasperReports
05

Certifications

01

Spring Boot: Build Web APIs

Udemy · 2025

02

The Complete PL/SQL Bootcamp

Udemy · 2025

03

The Complete SQL Bootcamp

Udemy · 2025

04

Advanced React: Design Systems & Performance

Udemy · 2026

05

Advanced React for Enterprise

Udemy · 2026

06

LangChain & LangGraph: Agentic AI

Udemy · 2026