Mario Athanasiou
AI Data Professional · Greek Language Specialist
About
Early-career AI data professional specialising in Greek-language annotation and QA, PII labeling and auditing, transcription quality review, and prompt-response evaluation. Brings prior customer success and technical support experience: 2,000+ interactions with a 95% CSAT rating, translating into disciplined guideline adherence, structured written rationales, and careful edge-case handling in remote, process-driven teams. Currently working on Currently working on generative AI improvement projects.
Core Skills
🤖 AI & Data
🗣️ Languages
🛠️ Tools & Tech
💬 Soft Skills
Experience
- Evaluate pairs of AI-generated responses using structured multi-criteria frameworks covering safety, correctness, instruction adherence, formatting, and language quality
- Provide detailed written rationales and preference rankings to inform model training and improve LLM output quality
- Annotate and validate JSON-formatted AI outputs on SuperAnnotate, applying complex project guidelines to ensure consistency across evaluation dimensions
- Review and refine AI-agent outputs before delivery, checking alignment with client instructions and formatting specs
- Build detailed Google Sheets matched to exact brand and product specifications for ground-truth datasets
- Collaborate with QA teammates to improve generative AI system performance
- Quality-checked Greek audio transcriptions for speech-to-text datasets against project guidelines
- Verified timestamps, transcription quality, speaker labels, and documented recurring ASR error patterns
- Contributed feedback that supported guideline updates and workflow refinements
- Labeled PII in Greek social media text across 70+ categories, then promoted to auditing role
- Reviewed annotator outputs for accuracy, consistency, and GDPR-aligned privacy compliance
- Distinguished between direct, strong indirect, and weak indirect identifiers with secure data handling
- Supported customers of a wealth-management platform on transfers, funds, pensions, and regulatory edge cases
- Handled escalations requiring FCA and consumer-duty awareness; partnered with engineering on bug investigation
- Reported user pain points and product feedback that directly informed UI/UX improvements
- Delivered 1:1 support across Windows, Xbox, and Microsoft Community — 95% CSAT across 2,000+ interactions
- Analysed and cleaned 50,000+ CRM customer interaction records
- Created internal response templates adopted team-wide, reducing handling time and improving consistency
Education
🎹 Music School of Pallini
Citizen Science
🧬 Folding@home — Distributed Computing for Disease Research
🧠 Also analysing brain blood flow data for Alzheimer's research on Stall Catchers. Long-term interest in computational biology, connectomics, and ML in medicine.
Certifications
Projects
An interactive neuroscience learning platform vibecoded from scratch — covering neurons & action potentials, synapses, neural networks, glia, sleep science, and more. Features real-time simulations, interactive visualizations, and a full 6-chapter curriculum with 2025 research citations. A personal project born from a deep interest in computational biology, connectomics, and open science education.
Beyond Work
🗣️ Languages
- Greek — Native
- English — C2 (Cambridge ECPE)
- Mandarin Chinese — Learning
- Spanish — Learning
🎨 Interests
- Gouache painting — Studio Ghibli palette
- Fantasy fiction as Mario Kade
- Classical piano & accordion
- Privacy tools (Tor, I2P, Monero)
- Computational biology & open science
🤝 Volunteer
- Ukrainian Aid Center in Greece
- Translation & refugee support
- March 2022 – June 2022