Full-Stack .NET Developer

Themis Tsiligkoudis

Full-Stack .NET Developer with 5+ years of experience designing, building, and shipping production web applications. I turn business requirements into reliable software across the entire stack — from REST APIs and SQL databases to responsive front-end interfaces — with a strong focus on code quality, performance, and clean problem-solving.

[email protected]

Core Strengths

Full-stack web development across front-end and back-end systems.
Designing and consuming REST APIs, with hands-on experience in database modeling.
Strong analytical and debugging skills — comfortable diving into legacy code.
Customer-facing experience that translates user pain points into shipped fixes.
Building business reports and analytics with SQL Server Reporting Services (SSRS).
Collaborative team player with experience in Agile delivery and code reviews.

Tech Stack

HTML, CSS, JavaScript

C#, VB, C, C++

ASP.NET MVC & Core

ASP.NET Core Blazor

ASP.NET MAUI

REST, OpenAPI / Swagger

GraphQL

SignalR

SQL Server, T-SQL

SSRS Reporting

Azure DevOps, Git

WordPress

Work Experience

Core member of the development team building the company's flagship education-management platform. Deliver new features and resolve production issues across both front-end and back-end on a daily basis.

Designed and shipped new features end-to-end using ASP.NET, C#, HTML, CSS, and JavaScript.
Investigated and resolved complex production bugs, reducing recurring incidents.
Refactored legacy modules using modern patterns to improve maintainability and performance.
Closed 1,300+ Azure DevOps work items, accounting for 2,000+ logged engineering hours.

Acted as the technical bridge between customers and the development team — resolving configuration issues, debugging real-world scenarios, and turning support insights into actionable backlog items and reports.

Resolved 3,000+ customer support cases across configuration, data, and integration issues.
Logged 2,000+ Azure DevOps cases for bugs and product backlog improvements.
Closed 500+ engineering cases covering migrations, data fixes, and report bugs.
Authored 400+ new SSRS reports from scratch and refined 150+ existing ones.
Wrote 250+ T-SQL scripts to address customer issues and custom requirements.
Strong debugging and root-cause analysis skills across complex, multi-layer systems.
Hands-on experience integrating with third-party providers and external APIs.

Assigned to office duties leveraging my Computer Science background. Automated repetitive administrative work and supported daily IT operations.

Improved an Excel VBA program that automatically assigned soldiers to daily duties.
Updated a tool that automatically tracked and calculated military leave records.
Digitised and archived soldier files, organised by year for fast retrieval.
Conducted intake interviews with newly arrived personnel.
Diagnosed and repaired faulty office electronics.

Started my career at Classter as a summer intern, gaining hands-on exposure to a real-world product, processes, and engineering teamwork.

Wrote test cases and validated new features through manual software testing.
Documented database schemas to support onboarding and feature work.
Designed custom CSS themes for the company's main product.
Assisted in setting up the company's new internal network infrastructure.

Education

Integrated Master's in Electrical & Computer Engineering — specialisation in Computer Software Engineering.

Final grade: 7.03 / 10

Projects & Accomplishments

EShop — ASP.NET Core Production-grade e-commerce web app rebuilt on ASP.NET Core with advanced patterns and a clean architecture. EShop Web API REST API powering the EShop application, fully documented with Swagger / OpenAPI. EShop — ASP.NET MVC Original e-commerce build using the classic ASP.NET MVC stack as a learning baseline. EShop Mobile Cross-platform mobile companion app for the EShop project, built with ASP.NET MAUI. Library Web App Full library management web application built on ASP.NET Core, reusing patterns from the EShop project. Hangman Web Browser version of the classic Hangman game, built with vanilla HTML, CSS, and JavaScript. Hangman Mobile Native-feel mobile version of Hangman built with ASP.NET MAUI for iOS and Android. Real-Time Chat & Hangman Online SignalR server enabling real-time messaging and online multiplayer gameplay for Hangman. Online Tools Suite Collection of everyday developer utilities built on ASP.NET Core Blazor. File Service API Personal file-handling REST API written in ASP.NET Core, used across my other projects. Arduino Anti-Theft Device Embedded GPS / GSM / GPRS prototype that detects and reports unauthorised movement. Arduino Camera Snapshot Companion Arduino camera module that captures snapshots for the anti-theft device.