Mike Chionidis

Mike Chionidis

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Data Products Support Team Lead at Margera • Full Stack Software/Data Engineer • Python, Django, SQL, GCP, ETL, Machine Learning, BI
Greece
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Résumé

Jobs verified_user 0% verified
  • V
    Founder & Full Stack Engineer
    VibeFix
    May 2025 - Current (1 year 6 months)
    We debug, clean up, and ship your vibe-coded product
  • H
    Founding Engineer (Full Stack, AI)
    Headquarters Health
    Apr 2025 - Current (1 year 7 months)
    First engineering hire at a San Francisco-based, venture-backed startup, building the leading virtual clinic for concussion care in the US. I work end-to-end across clinician and patient-facing web applications, focusing on product quality, security, and rapid iteration in a regulated healthcare setting.
  • T
    Founder & Full Stack AI Engineer
    TheFairytale.App
    Mar 2025 - Current (1 year 8 months)
    TheFairytale.App is an AI-powered platform that generates personalized children's stories in seconds. As the founder and full stack AI engineer, I built the platform from the ground up — from concept and system design to development and launch. 🔹 Designed a playful, family-friendly UX for parents, educators, and therapists 🔹 Developed the backend using LLMs to generate unique, age-appropriate stories 🔹 Created a flexible story engine based on user inputs (age, hero, theme, setting, etc.) 🔹 Launched with a library of free magical stories to boost user engagement 🔹 Implemented scalable infrastructure to support story creation at high volume �
  • I
    Founder & Full Stack AI Engineer
    Invoiceflows
    Nov 2024 - Current (2 years)
    InvoiceFlows is an AI-powered platform that streamlines invoice management for businesses. Users can upload invoices in various formats, including PDF and mobile captures, allowing the AI to extract essential details like amounts, dates, and VAT with 99% accuracy. The platform offers features such as real-time financial analytics, smart categorization, and one-click sharing with accountants. Additionally, InvoiceFlows ensures data security through strong cloud encryption and a zero-access design. 🔹 Built a robust invoice upload & parsing pipeline using AI for 99% accuracy in OCR 🔹 Created ML-powered categorization based on historical accounting patterns 🔹 Developed auto-suggestions for VAT, cost centers, and transaction matching 🔹 Built
  • D
    Founder & Data Engineer
    DataProjects.io
    Mar 2024 - Current (2 years 8 months)
    𝗙𝗼𝘂𝗻𝗱𝗲𝗿 & 𝗟𝗲𝗮𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗮𝘁 𝗗𝗮𝘁𝗮𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀.𝗶𝗼 At DataProjects.io, we are dedicated to empowering data professionals through hands-on, real-world projects in data science and cloud computing. As the founder, I focus on developing comprehensive learning tools that help users from diverse backgrounds enhance their skills in big data, machine learning, and cloud technologies across platforms like AWS, GCP, and Azure. Our projects enable learners to build market-ready skills and confidently tackle data challenges in any production environment. Join us to advance your career with practical experience and become part of
  • M
    Founder & AI Product Engineer (Full Stack, Data & AI Products)
    MikeChionidis.com
    Apr 2023 - Current (3 years 7 months)
    🚀 𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗲𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲. 𝗗𝗮𝘁𝗮 & 𝗔𝗜 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸:
    • 𝗙𝗿𝗼𝗻𝘁-𝗲𝗻𝗱: Next.js, React, TypeScript, Tailwind CSS, HTML, CSS, JavaScript.
    • 𝗕𝗮𝗰𝗸-𝗲𝗻𝗱: Python, Django, FastAPI, Node.js, Express.js
    • 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀: Google Cloud Platform (GCP), Vercel, Docker, Git & GitHub
    • 𝗔𝗜 & 𝗠𝗟: Machine Learning (ML), Data Pipelines, LLM Integrations (OpenAI, Anthropic, Gemini)
    • 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: SQL (PostgreSQL, MySQL, SQLite), Supabase
    • 𝗢𝘁𝗵𝗲𝗿 𝗧𝗼𝗼𝗹𝘀: Cursor, Windsurf, v0, Lovable, Resend, Stripe 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: ✅ Full-Stack Web Application Development ✅ AI SaaS Development & LLM Integration ✅ ETL & ML Pipelines ✅ API Development
  • Stealth Startup
    AI Engineer / Prompt Engineer
    Stealth Startup
    Apr 2024 - Mar 2025 (1 year)
    Working remotely with a stealth startup on cutting-edge AI and data operations, involving prompt engineering, quality evaluation, and fine-tuning of LLM-based systems. Due to confidentiality, project details are under NDA.
  • Proset
    Full Stack Engineer – Public Sector Platforms
    Proset
    Mar 2024 - Apr 2025 (1 year 2 months)
    🚀 Projects: 1. Citizen Application & Enrollment Management Platform Designed and developed a web platform for managing applications, enrollments, and recurring charges across municipal structures such as schools, KDAP centers, music academies, and art programs.
    • Enables seamless digital onboarding and monthly fee tracking for 10,000+ citizens.
    • Features include application scoring automation, document verification, admin dashboards, and reporting.
    • Supports both manual and automated intake of citizen applications from integrated services. 2. Public Contract Management System Developed a full-featured contract lifecycle management system for public sector entities, covering studies, requests, tenders, direct awards, and ap
  • Margera
    Lead Product Engineer (Full Stack, Data & AI Products)
    Margera
    Jun 2023 - Apr 2024 (11 months)
    𝗔𝗱𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗥𝗲𝘀𝗽𝗼𝗻𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀 Lead a team of three engineers responsible for maintaining and improving eight data products for Publicis Groupe UK.
  • Margera
    Product Engineer (Full Stack, Data & AI Products)
    Margera
    Sep 2022 - Jun 2023 (10 months)
    𝗔𝗱𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗥𝗲𝘀𝗽𝗼𝗻𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀
    • Leading support for multiple SaaS data products (Django web applications) delivered within the past 2 years, ensuring high-quality customer service and satisfaction.
    • Mentoring junior colleagues, providing guidance and support for professional development while reviewing task progress.
    • Valuable contributor to the hiring team, interviewing and assessing over 50 candidates for open positions within the company.
  • Publicis Groupe UK
    Embedded Product Engineer | Martech Products (via Margera)
    Publicis Groupe UK
    May 2021 - Apr 2024 (3 years)
    Worked as an embedded product engineer within the Publicis Groupe (Performics UK), building AI and data-driven Martech tools for campaign optimization and media planning. Contributed to the development of award-winning platforms used by global agencies such as Starcom, Zenith, and Spark Foundry. 🔹 Key Products:
    • Social Hero – A proprietary social investment optimization tool that recommends optimal budget distribution across social media platforms. Shortlisted for Best Social Technology at the Global Social Media Awards 2024.
    • Social Intelligence – A cross-platform ad intelligence tool that tracks competitor campaigns across TikTok, Meta, X, and Google Ads. Uses ML to estimate spend, reach, impressions, and more. Best Social Me
  • Margera
    Junior Product Engineer (Full Stack, Data & AI Products)
    Margera
    May 2021 - Sep 2022 (1 year 5 months)
    𝗦𝘂𝗺𝗺𝗮𝗿𝘆 Develop and deliver end-to-end data products used by Fortune 500 brands like Three Mobile, Clarins, P&G, etc., at Publicis Groupe. Leverage strong technical skills in web scraping, ETL pipelines, data analysis, and machine learning to build scalable data solutions and interactive dashboards. Experience collaborating directly with stakeholders to understand their needs and deliver client-focused solutions. 𝗝𝗼𝗯 𝗿𝗲𝘀𝗽𝗼𝗻𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀:
    • Design and implement ETL pipelines, data warehouses, and machine learning models (classification & clustering).
    • Build interactive dashboards with Looker Studio to visualize data insights.
    • Develop user-facing web applications to display data and predictions.
    •
  • NET2GRID
    Cloud Platform Engineer
    NET2GRID
    Mar 2021 - May 2021 (3 months)
    Worked on API projects: Automatically generate API definitions, using Symfony Framework (PHP). -Produced Data Transfer Objects (DTOs) and API Controllers in PHP for the company’s APIs. -Created APIs’ documentation using Zircote library and Swagger Editor -Tools & Libraries used: Symfony 5, OpenAPI format, Docker, Vagrant, Ubuntu
  • Aristotle University of Thessaloniki (AUTH)
    Undergraduate Researcher – AI & ML Engineer
    Aristotle University of Thessaloniki (AUTH)
    Aug 2020 - Mar 2021 (8 months)
    Worked under the supervision of Dr. Dimitrios Kugiumtzis on a research project focused on dimensionality reduction and feature selection using Conditional Mutual Information. 🔍 Key focus: Enhancing the CMIMN algorithm for better performance on datasets with overlapping feature characteristics. 👨‍💻 Responsibilities:
    • Preprocessed and analyzed high-dimensional datasets to identify and remove noisy or redundant features.
    • Implemented and evaluated feature selection algorithms using Python and machine learning models like kNN.
    • Proposed and validated an improved dimensionality reduction technique tailored for datasets with overlapping features.
    • Conducted performance benchmarking and analysis through multiple experime
Education verified_user 0% verified
  • Aristotle University of Thessaloniki (AUTH)
    master, Master of Engineering - MEng Electrical and Computer Engineering
    Aristotle University of Thessaloniki (AUTH)
    Jan 2015 - Jan 2021 (6 years 1 month)
  • 1
    High School Diploma
    1st General Highschool of Kilkis
    Jan 2011 - Jan 2014 (3 years 1 month)
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