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I'm an AI data professional specializing in Greek-language annotation, transcription QA, PII labeling, and prompt-response quality review. I follow complex guidelines meticulously, produce clear written rationales, and spot quality, privacy, and workflow issues to help teams ship safer, more reliable AI. My background in customer and technical support translates into thoughtful communication, careful edge-case handling, and dependable execution in remote, process-driven teams. I'm also passionate about computational biology and open science, and I contribute to community projects to stay curious and engaged.…I'm an AI data professional specializing in Greek-language annotation, transcription QA, PII labeling, and prompt-response quality review. I follow complex guidelines meticulously, produce clear written rationales, and spot quality, privacy, and workflow issues to help teams ship safer, more reliable AI. My background in customer and technical support translates into thoughtful communication, careful edge-case handling, and dependable execution in remote, process-driven teams. I'm also passionate about computational biology and open science, and I contribute to community projects to stay curious and engaged.

Mario Athanasiou

Data Annotator, QA Engineer, AI Prompt Engineer, +1

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I'm an AI data professional specializing in Greek-language annotation, transcription QA, PII labeling, and prompt-response quality review. I follow complex guidelines meticulously, produce clear written rationales, and spot quality, privacy, and workflow issues to help teams ship safer, more reliable AI. My background in customer and technical support translates into thoughtful communication, careful edge-case handling, and dependable execution in remote, process-driven teams. I'm also passionate about computational biology and open science, and I contribute to community projects to stay curious and engaged.…I'm an AI data professional specializing in Greek-language annotation, transcription QA, PII labeling, and prompt-response quality review. I follow complex guidelines meticulously, produce clear written rationales, and spot quality, privacy, and workflow issues to help teams ship safer, more reliable AI. My background in customer and technical support translates into thoughtful communication, careful edge-case handling, and dependable execution in remote, process-driven teams. I'm also passionate about computational biology and open science, and I contribute to community projects to stay curious and engaged.

Available to hire

I’m an AI data professional specializing in Greek-language annotation, transcription QA, PII labeling, and prompt-response quality review. I follow complex guidelines meticulously, produce clear written rationales, and spot quality, privacy, and workflow issues to help teams ship safer, more reliable AI.

My background in customer and technical support translates into thoughtful communication, careful edge-case handling, and dependable execution in remote, process-driven teams. I’m also passionate about computational biology and open science, and I contribute to community projects to stay curious and engaged.

Skills

Experience Level

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Greek, Modern

Fluent

English

Fluent

Chinese

Beginner

Spanish; Castilian

Beginner

Work Experience

AI Response Evaluator / Annotator at LILT

April 1, 2026 - Present

Evaluate 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 outputs. Annotate and validate JSON-formatted outputs on SuperAnnotate, applying project guidelines to ensure consistency and accuracy across evaluation dimensions.

General AI Tutor / Prompt Engineering QA at Mindrift

December 1, 2025 - March 1, 2026

Review and refine AI-agent outputs before delivery, checking instruction compliance and formatting requirements. Build detailed Google Sheets lists matched to exact brand and product specifications. Collaborate with QA teammates on ground-truth datasets used to improve generative AI systems.

Greek Audio Transcription QA Specialist at DatApp Technology

September 1, 2025 - January 31, 2026

Quality-checked Greek audio transcriptions for speech-to-text datasets; verify timestamps, transcription quality, and speaker labels; document recurring ASR error patterns; contributed feedback that supported guideline updates and workflow refinements.

Data Annotation Auditor & Specialist (Greek Language) - PII Data at iMerit Technology

June 1, 2025 - January 31, 2026

Labeled Greek PII across 70+ categories; later audited annotator outputs for accuracy, consistency, and GDPR-aligned privacy compliance; distinguished between direct, strong indirect, and weak indirect identifiers while following secure data-handling procedures.

Customer Success Agent at Plum

July 1, 2024 - May 31, 2025

Primary contact for complex customer issues on a fintech wealth-management platform; partnered with engineering to investigate bugs, reducing resolution times; gathered structured feedback to inform UI/UX improvements.

Technical Support Representative at Movate (for Microsoft)

December 1, 2020 - March 31, 2023

Delivered 1:1 support across Windows, Xbox, and Microsoft Community with a 95% customer-satisfaction rating across 2,000+ interactions; contributed to CRM data-cleaning and knowledge-base expansion; designed response templates adopted company-wide.

Retail and Customer Service Roles at ICAP Group | H&M | JYSK

January 1, 2019 - December 31, 2024

Ranged responsibilities in marketing campaigns, competitive research, visual merchandising, shift leadership, and bilingual customer service across multiple brands.