← Back to Home

Constantinos Frangeskou

Computer Science Student · Web Developer · Startup Builder

Full-Stack Developer and Computer Science student at the University of Crete. Founder of EduPay, a SaaS platform used by 70+ tutoring centers. Skilled in JavaScript, Node.js, PHP, SQL, and Firebase. Open to Software Engineering, Frontend, and Full-Stack roles.

Constantinos Frangeskou
Location: Paphos, Cyprus
Portfolio: kfragkeskou.eu

Experience

Air Balloon Digital Studio - New Entrepreneur / Software & Digital Projects

Erasmus for Young Entrepreneurs · Paphos, CyprusJul 2026 – Dec 2026
  • Six-month professional entrepreneurial placement at Air Balloon Digital Studio through the EU-funded Erasmus for Young Entrepreneurs programme, contributing to real client and internal digital projects.
  • Sole developer of the studio’s ABC Basketball Academy platform — 200+ athletes, 21 admin screens, 28 Cloud Functions, Stripe payments and a parent PWA, delivered across 30 sprints.
  • Using the exchange to further develop and scale EduPay: customer acquisition, market validation, SaaS operations, sales, pricing, and product strategy.

Founder & Full-Stack Developer - EduPay

edupay.grJan 2026 – Present
  • Founded EduPay, a web-based SaaS platform for tutoring centers; now used by 70+ tutoring centres tracking 1,600+ students.
  • Built the platform end-to-end on Firebase and modern web technologies; designed the UI/UX.
  • Won 1st place at the University of Crete Business Idea Pitch; led branding, marketing, and customer discovery from first pilot to paying customers.

Teaching Assistant - Java Programming

University of CreteSep 2025 – Present
  • Support a 350-student undergraduate Java Programming module across 3 lab sections and 6 rounds of code review.
  • Provide debugging guidance and explain object-oriented programming and software design concepts.
  • Tools: Java, OOP, IntelliJ IDEA.

Website Developer

Minautor Racing Team (Formula Student)Sep 2025 – Present
  • Rebuilt the Formula Student team website with a mobile-first responsive design.
  • Drove a 250% increase in site traffic through a full technical SEO overhaul — structured metadata, Open Graph tags, and sitemap indexing — raising the team's visibility to prospective sponsors.
  • Stack: HTML, CSS, Tailwind CSS, JavaScript, Firebase Hosting.

Certifications & Volunteering

  • Course Certificate - GenAI Fundamentals — 100mentors, Apr 2026. Generative AI principles, responsible-use practices, and workflow-based applications.
  • Foundit Explore Entrepreneurship — Bizrupt, Mar 2026. Workshops in idea validation, startup operations, and collaborative problem solving.
  • Volunteer - Get Hired Live — Bizrupt, Feb 2026. Supported event operations across live interview sessions.
  • Volunteer - Robotics Mentor — Robotex Cyprus, Nov 2025. Mentored students in Arduino programming and hardware at Cyprus' largest robotics competition.

Recommendation Letters

Selected Projects

Product, Studio & Freelance Projects See all projects at kfragkeskou.eu

ABC Basketball Academy - Management Platform

Sole Developer · Air Balloon Digital Studio2026
  • 200+ athletes across seasons: CRM, groups with waitlists, programmes, attendance, uniforms, sponsors and expenses.
  • Monthly/weekly/per-session/one-off billing, Stripe Checkout with webhook reconciliation, and a passwordless parent PWA.
  • 30 sprints; 21 admin screens, 28 Cloud Functions, 131 acceptance tests.
200+ Athletes in Production

EduPay - Institute Payment Tracker

Founder & Developer2026
  • QR-based payment tracking, student database, and class scheduling with timetable integration.
  • Automated cloud backups and payment history reporting.
  • Stack: Firebase (Firestore, Auth, Hosting, Cloud Messaging), JavaScript.
1st Place - Startup Pitch, UoC

Yese.gr - Interactive City Guide

Freelance Work2026
  • Mobile-first city guide with dynamic map interface and category filters.
  • Multi-language content, live updates, and admin panel for locations/events.
  • Stack: Firebase (Firestore, Auth, Hosting), JavaScript, Maps API.

PanExams Hub - AI Study Platform

Founder & Developer2026
  • AI-powered study tools (flashcards, quizzes, practice tests) over Cyprus exam papers.
  • Stripe premium subscriptions, secure Firebase Auth/Firestore rules, AdSense integration.
  • Stack: Firebase, Firestore, Stripe, JavaScript, AI APIs.

Amerikanos Diner

Freelance Work2026
  • Cinematic, menu-first responsive site for an American-classics diner in Heraklion.
  • Photography-led layout, mobile-first design, and Firebase Hosting deployment.
  • Stack: HTML, CSS, JavaScript, Firebase Hosting.

CarNova AutoSales

Freelance Work2026
  • Responsive auto dealer site with URL-driven listings and touch-optimized galleries.
  • Secure admin panel, bilingual EL/EN, SEO/Open Graph metadata.
  • Stack: HTML, CSS, JavaScript, Firebase Firestore.

PicMeUp - Event Photo Sharing

Founder & Developer2025
  • Real-time photo sharing web app for weddings and events.
  • Instant uploads, shared online gallery, mobile-first design.
  • Stack: Firebase Storage, Realtime DB, JavaScript.

Avli tis Nefelis - Garden Cafe

Freelance Work2026
  • Premium site for a family-run garden cafe in Paphos: story, menu, sustainability ethos, and gallery.
  • Bilingual GR/EN content, animation-driven browsing, and multi-channel contact integration.
  • Stack: HTML, CSS, JavaScript.
University Projects

University of Crete Payroll System

University Project2026
  • HR/payroll web app with employee, contracts, and department management.
  • Designed SQL schema, RESTful routes, automated payroll processing and reporting.
  • Stack: Node.js, Express, SQL, REST API, HTML/CSS/JS.
Grade: 100/100

Band & Event Management Platform

University Project2026
  • Web app connecting users and bands with profiles, messaging, and reviews.
  • Public/private events, request flows, admin tools, and DB scripts.
  • Stack: Node.js, SQL, HTML/CSS/JS.
Grade: 100/100

microTCP - Educational Transport Stack

University Project2026
  • TCP-like transport over UDP: handshake, CRC32 reliability, segmentation.
  • Implemented flow control and basic congestion control.
  • Stack: C, CMake, Networking, Systems Programming.
Grade: 100/100

Alpha Compiler & Virtual Machine

University Project2026
  • Full compiler and VM for the Alpha language, implemented in C.
  • Lexical analysis, parsing, semantic analysis, intermediate and target code generation, and execution on a custom virtual machine.
  • Stack: C, Flex/Bison, Compilers, Virtual Machine.
Grade: 100/100

Greek Electoral System Simulator

Data Structures Course2024
  • Voting, party results, and constituency management simulator.
  • Implemented hash tables, binary trees, and linked lists from scratch.
  • Stack: C, Data Structures, Algorithms.
Grade: 100/100

Lost Cities - Card Game

University Project2024
  • Two-player Java card game with full game logic and UI.
  • Applied object-oriented principles and design patterns.
  • Stack: Java, OOP, Design Patterns.
Grade: 100/100 + 13 bonus