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Work Background
GitHubCloudVm — Browser-Accessible Linux Virtual Machine Platform
Mar. 2026GreeceI designed and implemented CloudVm, a browser-accessible Linux workstation that runs a full desktop environment inside containers and can be accessed remotely without installing local software. The goal was to explore how modern infrastructure tooling can deliver portable cloud computing environments that behave like lightweight virtual machines.The platform runs Ubuntu 22.04 with an XFCE desktop environment and streams the graphical session directly to a browser using a remote desktop stack built with TigerVNC, noVNC, websockify, and Xvfb. This architecture allows users to interact with a full Linux desktop from any device through a simple web interface. The system was designed using containerized infrastructure and DevOps automation. The entire environment can be deployed with a single command using Docker and Docker Compose, automatically initializing the virtual display, desktop session, remote desktop services, and browser interface. During development I also implemented secure DevOps practices, removing exposed credentials from the repository and introducing environment-based configuration, secret management, and proper repository hygiene to prevent sensitive data leaks. The final result is a portable cloud workstation architecture that demonstrates how containers and remote desktop technologies can be combined to deliver browser-accessible Linux environments suitable for development, remote workstations, and self-hosted cloud infrastructure. Github Repo: https://github.com/kostasuser01gr/CloudVm.git
DevpostVoice-to-Action Agent — Transcript/Text → Structured Outputs (Summary • Actions • Email • Audit)
Feb. 2026GreeceBuilt a production-grade hackathon SaaS that transforms voice transcripts or raw text into schema-strict deliverables—executive summaries, action items, email drafts, audit trails, and diagnostics—backed by validated structured output, reliability guardrails, and clear traceability. Shipped with a live deployment and a test-first CI workflow (lint → tests → evaluation checks → build) to keep regressions out. Quality & authorship: End-to-end architecture, design, and implementation by me. AI assistants were used as a QA accelerator (suggesting test cases and surfacing failure modes like rate-limit edge cases and schema-validation gaps), while all core logic, safety constraints, and final engineering decisions were authored and verified under my ownership.
GitHub PortfolioCar Rental Platform — Full-Stack Booking (Auth • Search • Stripe • WebSockets • PWA • i18n)
Jan. 2026GreeceEngineered a full-featured car rental platform with JWT-based authentication, advanced vehicle search, multi-step booking, Stripe payments, real-time support chat over WebSockets, dashboards, reviews, loyalty features, multilingual support (EN/GR/DE/FR/IT), and PWA capabilities.
Authorship & QA: Designed and built end-to-end by me. AI assistants were used only to pressure-test business logic and failure modes—such as booking-state edge cases, payment-flow validation, and i18n regressions—while GitHub Actions supported automated verification.
GitHub PortfolioVoice-to-Action Agent — Transcript/Text → Structured Outputs (Summary • Actions • Email • Audit)
Jan. 2026GreeceBuilt a production-style hackathon SaaS that transforms transcripts and free text into strict structured outputs—including an executive summary, action items, email draft, audit trail, and diagnostics—with schema validation, reliability guardrails, live deployment proof, and a test-first workflow (lint/test/eval/build).
Authorship & QA: Designed and implemented end-to-end by me. AI tooling was used to generate test ideas and surface failure modes—such as rate-limit and schema-validation edge cases—but all core logic, safeguards, and final decisions were engineered and verified.
GitHub PortfolioMCP Car Rental — Local MCP Server + AI Chat Hub (JSON-RPC over HTTP • SSE • PWA)
Jan. 2026GreeceBuilt a local Model Context Protocol (MCP) server for car-rental fleet operations, exposing six fleet tools over JSON-RPC/HTTP, alongside an integrated AI chat hub with smart provider routing, SSE streaming, and a PWA client. The system was designed to stay lightweight for local deployment with SQLite while remaining compatible with MCP clients and OpenAI Apps SDK patterns.
Authorship & QA: I designed the architecture and implemented the full system myself. AI copilots were used strictly as a review layer—for example, to surface missing validation paths and suggest tool-schema test cases—while CI workflows supported automated verification.
GitHub PortfolioInternalToolKit — Premium Internal Ops Platform (Fleet • Shifts • Washers • Chat • Analytics)
Jan. 2026GreeceBuilt a production-grade internal operations platform for fleet management, shift planning, washer operations, team chat, feeds/imports, and analytics/reporting, delivered as a Next.js monorepo with a hardened security posture and deep technical documentation. The repo also documents system architecture, module boundaries, and an extensive remediation history for production security and reliability issues.
Authorship & QA: End-to-end design and implementation by me. AI assistants were used for test planning and risk spotting—such as auth-redirect and CSP edge cases—while GitHub Actions pipelines enforced automated checks before changes were considered complete.
GitHub PortfolioSun Ninja Redesign — Premium E-Commerce + Design System (React • Tailwind • Figma Scaffold)
Jan. 2026GreeceDelivered a premium, conversion-oriented storefront redesign with React/TypeScript/Vite/Tailwind and a full design-system workflow (Figma source included). The experience goes beyond a standard PDP: it includes features like a real-time UV dashboard, skin-type quiz, rewards/gamification, sustainability dashboard, recommendation widgets, and an accessible cart—wrapped in a “luxury” UI system with motion and micro-interactions.
Quality & authorship: Full redesign + implementation by me. AI copilots were used as a testing assistant (example: generating Playwright test scenario lists + accessibility regression checks), while automated checks and workflows kept build/test quality consistent.
GitHub PortfolioHackGpt fork — architecture study + safe workflow improvements
Jan. 2026GreeceExtended the HackGpt codebase (originally by Yashab Alam / ZehraSec) to study a cloud-native security-assessment architecture and implement safe, authorized workflow improvements, including CI/testing hardening, documentation upgrades, and stronger operational guardrails.
Authorship & QA: My fork represents my own engineering work on top of the original baseline. AI assistants were used only for testing ideas and static-analysis guidance, and every committed change was reviewed and owned by me.
GitHub PortfolioContributing - HackGPT Enterprise (Fork) — Cloud-Native AI-Assisted Security Assessment Platform
Dec. 2025Attiki, GreeceExtended the HackGpt codebase (forked from yashab-cyber/HackGpt) to explore an AI-driven, cloud-native security-assessment platform focused on enterprise workflows such as reporting, compliance alignment, and scalable deployment. My fork adds a read-only device inventory and network-auditing module for authorized environments, with explicit safety constraints: no active scanning, no packet capture, authorized use only.
AdenContributing to Aden Hive (Agent Framework)
Dec. 2025Iráklion, Crete, GreeceI’ve been contributing to the Aden Hive (Agent Framework) project and set up a clean, maintainer-friendly contribution pipeline on my fork — focused on quality, CI-proof, and zero-noise collaboration. What I implemented: • Fork main is now a strict mirror of upstream/main (clean baseline, no drift) • Introduced a dedicated fork/integration runway branch for CI gating and safe iteration • Adopted an issue-first workflow with strict duplicate prevention and evidence-based validation • Structured a “fork-first quality gate” so upstream PRs are only opened once checks are green and the change is review-ready Why this matters (for maintainers + contributors): • Less duplicate work and fewer half-baked PRs • Faster review cycles (small diffs, clear validation evidence) • Cleaner history and safer collaboration across multiple workstreams Next up: I’m prioritizing tools/integrations and example agents, aiming for small-to-medium scoped fixes with high merge probability. If you’re working in agent tooling / MCP integrations and want to collaborate, feel free to reach out. 🔗 Fork: https://github.com/kostasuser01gr/hive
🔗 Upstream: https://github.com/aden-hive/hive #opensource #python #aiagents #mcp #devtools #engineering
GitHub PortfolioAurelia — Feelings & Music (AI + DAW-Lite + 3D Cosmos)
Nov. 2025GreeceBuilt a concept platform that blends confessional album posts, AI-assisted music creation, DAW-lite tooling, and a 3D “Cosmos” where songs visually connect people. Implemented with Next.js/TypeScript, Firebase, React Three Fiber, Tone.js, and the Web Audio API.
Authorship & QA: Full product concept and implementation by me. AI copilots were used as quality control—for example, to suggest Firebase rules/test scenarios and surface 3D/audio performance edge cases—but I owned all final architecture and code decisions.
GitHub PortfolioDataOS — Enterprise Data Platform (Spreadsheet UX • Automations • AI)
Oct. 2025GreeceDesigned and built an internal operating system that combines spreadsheet flexibility with relational-database power, automation workflows, collaboration, and AI assistance. Core capabilities include multi-view experiences (Grid/Kanban/Calendar), relational linking and rollups, a visual automation engine, and enterprise-grade controls such as row-level permissions and audit logs.
Authorship & QA: I architected and implemented the full solution end-to-end. AI coding assistants were used only as a QA partner—to propose test cases, flag edge cases, and sanity-check testing scripts—while I validated, refined, and shipped the final implementation myself.
GitHub PortfolioIndependent / Freelance Full-Stack Engineer
Sep. 2025Greece• Delivered production-minded SaaS applications with secure authentication, RBAC, admin dashboards, and real-time operational views. • Implemented Firebase Auth (session/role-aware flows) and enforced role-based UI permissions to separate admin and user capabilities cleanly. • Built real-time data patterns with Firestore/Realtime DB listeners, handling synchronization, optimistic UX where appropriate, and resilient reconnection behavior. • Developed serverless API routes for integrations, data exports, and operational automation (notifications, scheduled actions, workflow endpoints). • Set up GitHub Actions pipelines (lint/test/build/deploy) and managed environment configuration across staging and production on Vercel. • Wrote pragmatic handover docs (setup, deployment, runbooks) and structured codebases to improve maintainability and reduce onboarding time.
GitHub PortfolioCarWash Pro — Internal PWA Web App Structure for Fleet Washing Ops (Next.js + TypeScript)
Aug. 2025 - Oct. 2025GreeceDesigned and built a modern internal Progressive Web App (PWA) for vehicle washing management (fleet use-cases), structured for fast iteration and production discipline: offline support via service worker, installability across mobile/desktop, responsive layout coverage, accessibility-first UI, and SEO hygiene. The architecture is organized around operational modules including Vehicle Management, Staff Management, Shift Management, Leave Requests, Reservations upload, Team Chat, Health Check, Bulk Operations, and Reports/Analytics, plus a floating assistant UI entry point. Quality & authorship: I architected and implemented the solution end-to-end. AI coding assistants (Copilot-style) were used as a testing and review accelerator—to propose test checklists and flag likely failure modes—while all final code, decisions, and validation remained under my ownership. Examples of AI-assisted QA prompts I used responsibly: “List edge cases for offline/PWA install flows and cache invalidation.” “Identify likely accessibility regressions (focus states, ARIA roles, keyboard navigation).” “Spot TypeScript strict-mode pitfalls and missing null guards.” CI is enforced via GitHub Actions running linting, type-checking, formatting checks, and production builds, with build artifacts uploaded for traceability. Live demo: internalwebappstructure.vercel.app
Europcar Greece🚗 Europcar Greece – Employee
Apr. 2021Iráklion, Crete, Greece• Managed daily bookings/returns and ensured data accuracy under strict deadlines and handoffs. • Coordinated vehicle readiness workflows and handled exceptions (damages, swaps, delays) with clear escalation. • Identified recurring bottlenecks and translated them into structured process improvements (checklists, handover notes, standard steps). • Maintained consistent customer communication and resolved issues with a calm, service-first approach.
Proactive Α.Ε.- Σύμβουλοι Επιχειρήσεων🏢 Proactive A.E. – Office Employee
Sep. 2017 - May. 2018Iráklion, Crete, GreeceDuring my internship, following the completion of my university studies, I gained practical experience in business consulting, data management, and reporting within the tourism and economic sectors. 🔹 Key Responsibilities & Results Supported customer communication and maintained professional correspondence. Created analytical reports on development, tourism, and economic performance. Registered and archived records, ensuring accuracy and traceability of transactions. Designed and managed customer databases, particularly in agriculture and tourism sectors. Applied business analysis tools (SWOT and other strategic models) to evaluate entrepreneurial opportunities and assist in the preparation of business plans. Conducted performance evaluations and presented insights through statistical analysis and PowerPoint presentations for sustainable business strategies. 🔹 Skills Gained Business & Market Analysis Data Management & Database Creation Customer Communication & Reporting Strategic Planning (SWOT, Business Plans) Adaptability & Stress Management Team Collaboration & Information Sharing Confidence, Problem-Solving & Continuous Learning
Various Hotels around CreteHospitality & Tourism – Waiter / Restaurant Assistant Manager
Apr. 2015 - Nov. 2020CreteWorked for 4+ years in the tourism sector, gaining valuable hands-on experience in high-pressure environments that required adaptability, teamwork, and strong customer service skills. This period helped me develop professionalism, effective communication, and resilience while working with international clientele. 🔹 Key Responsibilities & Achievements: Trained new staff on restaurant policies, service standards, and safety procedures. Collaborated with the chef to coordinate daily specials and menu adjustments. Increased sales through effective upselling of appetizers, drinks, and desserts. Maintained customer satisfaction by providing timely service and resolving inquiries. Ensured fast table turnover by promptly resetting and preparing dining areas. Created and implemented customer service guidelines to exceed industry standards. Assisted in managing inter-departmental escalations, improving customer retention. Supported other service managers by cross-training and providing operational backup. Promoted excellent service with enthusiasm, resulting in increased referrals and walk-ins. Coordinated closely with kitchen staff for accurate and efficient food delivery. 🔹 Skills Gained:
Customer Service · Team Leadership · Training & Coaching · Upselling · Hospitality Management · Conflict Resolution · Communication · Time Management
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