Software Engineer | Identity, Backend & Systems Integration

SACHTOURIS

I build secure identity integrations, backend APIs, and reliable software systems that help organizations connect their platforms and operate more efficiently.

Selected Projects

A selection of software engineering projects spanning identity management, backend services, system integrations, and application infrastructure.

GUnet•2026

University Single Sign-On & Identity Management


  • Centralized Single Sign-On for university services

  • OAuth 2.0 / OpenID Connect, SAML 2.0, and CAS protocol support

  • Integration with institutional Identity Management systems

  • Custom Keycloak authentication mechanisms and extensions

University Single Sign-On & Identity Management
GUnet•2026

Custom Keycloak Identity Provider for GSIS


  • Custom Keycloak Identity Provider development

  • Authentication-flow integration using Keycloak SPI

  • Integration with the GSIS / TaxisNet authentication service

  • OAuth 2.0 token exchange integration

Custom Keycloak Identity Provider for GSIS
GUnet•2026

Digital Credentials Issuance (OID4VCI)


  • Integration with student information systems

  • Backend services for credential issuance

  • OID4VCI-based issuer integration

  • Credential lifecycle and expiration handling, where implemented

Digital Credentials Issuance (OID4VCI)
GUnet•2024

Multi-Database REST API Microservice


  • Integration with 15+ databases

  • Aggregation of results from multiple data sources

  • Centralized REST API for data retrieval

  • Defined access control

Multi-Database REST API Microservice
National and Kapodistrian University of Athens•2024

Identity-Integrated Helpdesk Platform (osTicket)


  • Integration with existing IDM and SSO infrastructure

  • Centralized user and role management

  • Hierarchical permissions

  • Customized dashboard and user interface

  • Real-time notifications

Identity-Integrated Helpdesk Platform (osTicket)
Alis - Yannis - Mimis•2024

The Monumental House — Accommodation Website


  • Responsive website

  • Property and accommodation information

  • Custom domain integration

  • Cost-conscious hosting setup

The Monumental House — Accommodation Website

Client & Collaborator Feedback

Feedback from clients and collaborators on technical problem-solving, software delivery, and professional collaboration.

Xristos Sgardelis

Xristos Sgardelis

Owner of E-Peiraias News Website

I love the website. Excellent work. All changes that I asked for were completed.

Lazaros Merakos

Lazaros Merakos

Chairman of the Board

Throughout the entire period of cooperation, he always had a positive spirit, facing every technological challenge with enthusiasm and perseverance in finding the best solution. At the same time, he collaborated with the "Identity Management" application management team and successfully met the requirements arising from the productive operation of key applications with high demands in terms of availability, performance and security.

Alisa

Alisa

Co-owner of The Monumental House AirBnB

I'm really happy with the end result. I just wanted a simple website for my AirBnB apartments.

Xristos Sgardelis

Xristos Sgardelis

Owner of E-Peiraias News Website

I love the website. Excellent work. All changes that I asked for were completed.

Lazaros Merakos

Lazaros Merakos

Chairman of the Board

Throughout the entire period of cooperation, he always had a positive spirit, facing every technological challenge with enthusiasm and perseverance in finding the best solution. At the same time, he collaborated with the "Identity Management" application management team and successfully met the requirements arising from the productive operation of key applications with high demands in terms of availability, performance and security.

Alisa

Alisa

Co-owner of The Monumental House AirBnB

I'm really happy with the end result. I just wanted a simple website for my AirBnB apartments.

About Me

My Approach

I combine software engineering and infrastructure experience to deliver practical, maintainable, and secure solutions that address real technical and business requirements.

  1. Requirements & Solution Design

    Phase 1

    I work with stakeholders to understand the requirements, identify technical constraints, and define a solution that fits the project's needs.

  2. Development & Integration

    Phase 2

    I develop software components, APIs, and system integrations, focusing on clear interfaces, reliable communication, and maintainable implementation.

  3. Testing & Deployment

    Phase 3

    I help prepare applications for production through testing, containerization, deployment, and practical operational considerations.

Technologies & Tools

Technologies I use to build backend services, integrate identity systems, develop web applications, and deploy reliable software.

Spring
.Net
Express
React
WordPress
GitHub
Docker
Spring
.Net
Express
React
WordPress
GitHub
Docker
Java
C#
JavaScript
PhP
C++
Java
C#
JavaScript
PhP
C++

Looking for an Experienced Software Engineering Partner?

Whether you need a backend service, an identity integration, or support delivering a software project, let's discuss your requirements and how I can contribute.