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E

Efthymios M.

AI Data Annotator

Greece flagAthens, Greece

Key Skills

Software

LionbridgeLionbridge
AppenAppen
RemotasksRemotasks
Don't disclose

Top Subject Matter

Search engine evaluation
AI training data
AI training

Top Data Types

TextText
ImageImage
AudioAudio
Computer Code ProgrammingComputer Code Programming
DocumentDocument

Top Task Types

Fine-tuningFine-tuning
TranscriptionTranscription

Freelancer Overview

Search Engine Evaluator at Lionbridge. Brings 21+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Lionbridge, Appen, and Remotasks. Education includes Graduate Degree, University of Peloponnese (2011) and Certificate of Proficiency in English, University of Michigan (2009). AI-training focus includes data types such as Text, Image, and Audio and labeling workflows including Evaluation, Rating, and Fine-tuning.

Labeling Experience

Transcription Specialist at ElevenLabs

AudioAudioTranscriptionTranscription

Worked as a transcription specialist converting spoken content into written text. Followed transcription standards for accuracy, formatting, and completeness. Ensured deliverables met platform requirements for clean, usable transcripts. • Transcribed audio/speech into text • Applied punctuation and formatting guidelines • Reviewed outputs for accuracy and completeness • Delivered transcripts through client workflow

2026 - Present

AI Trainer (Visual Content) at Rex.Zone

ImageImageFine-tuningFine-tuning

Provided visual content AI training/labeling support to help improve model capabilities. Interpreted task instructions to produce training-ready outputs related to visual inputs. Ensured labeled results met required quality and consistency standards. • Labeled visual content per assignment guidelines • Generated or refined training signals for model learning • Performed quality checks before submission • Completed tasks within platform workflow expectations

2025 - Present
Lionbridge

AI Data Trainer at Lionbridge

LionbridgeLionbridgeTextText

Continued AI data training work for ongoing labeling and evaluation initiatives. Completed tasks using provided guidelines to ensure reliable training signals. Maintained quality and consistency through careful adherence to instructions. • Worked on AI training data tasks via Lionbridge • Followed rubric-based instructions for labeling decisions • Completed submissions aligned with quality requirements • Supported dataset reliability through consistent output

2024 - Present

AI Data Trainer at Invisible

TextText

Performed AI data training tasks supporting model development and evaluation workflows. Followed task instructions to generate training data with required formatting and quality. Focused on consistent labeling decisions aligned with the client guidelines. • Completed AI data training assignments • Applied labeling criteria to produce required outputs • Ensured formatting and guideline compliance • Participated in iterative task improvements via instructions

2023 - Present

AI Trainer, Localization Expert and Transcriptionist at RWS

Don't discloseTextText

Served as an AI trainer, localization expert, and transcriptionist for ongoing model-support tasks. Adapted and localized content according to instructions to create training-ready data. Produced transcriptions with attention to detail while ensuring conformity to platform standards. • Trained models using provided data labeling workflows • Localized text/content per localization guidelines • Performed transcription for audio or speech inputs • Delivered outputs through RWS processes and quality checks

2023 - Present

Education

U

University of Peloponnese

Graduate Degree, Telecommunications Science and Technology

Graduate Degree
2005 - 2011
U

University of Michigan

Certificate of Proficiency in English, English Language

Certificate of Proficiency in English
2009 - 2009

Work History

G

Greek Maritime Network (OTE SA)

Senior Technician and GMDSS Radio Operator

Athens
2022 - Present
T

Theescape.gr

Owner, Developer and Administrator

Athens
2015 - 2024