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Stefan Kachevskii

Stefan Kachevskii

Expert RLHF Trainer & AI Content Specialist

Serbia flagSubotica, Serbia
$35.00/hrIntermediateInternal Proprietary ToolingSurge AIScale AI

Key Skills

Software

Internal/Proprietary Tooling
Surge AISurge AI
Scale AIScale AI
MindriftMindrift
MercorMercor
CVATCVAT
Data Annotation TechData Annotation Tech
HumanaticHumanatic
RemotasksRemotasks

Top Subject Matter

Large Language Model (LLM) Alignment and Training
Russian Language
Legal Services & Contract Review

Top Data Types

TextText
DocumentDocument
ImageImage

Top Task Types

RLHF
Text Generation
Object Detection
Fine Tuning
Transcription
Data Collection
Classification
Point Key Point
Text Summarization
Evaluation Rating

Freelancer Overview

Expert RLHF Trainer & AI Content Specialist. Brings 15+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Internal and Proprietary Tooling. Education includes Bachelor of Economics, Lomonosov Moscow State University (2016). AI-training focus includes data types such as Text and labeling workflows including RLHF.

IntermediateEnglishRussian

Labeling Experience

Expert RLHF Trainer & AI Content Specialist

TextRLHF
As an Expert RLHF Trainer at Invisible Technologies (Meridian), I executed high-precision Supervised Fine-Tuning and Reinforcement Learning from Human Feedback to improve Large Language Model performance for Russian. I specialized in hallucination detection, prompt engineering, and ranking/evaluation of LLM outputs. My work directly supported model alignment and safety in Russian-language AI systems. • Conducted supervised fine-tuning on AI model outputs in Russian. • Performed expert-level reinforcement learning based on human feedback (RLHF). • Developed and applied complex prompt engineering strategies for LLMs. • Evaluated and ranked model outputs for accuracy, truthfulness, and linguistic quality.

As an Expert RLHF Trainer at Invisible Technologies (Meridian), I executed high-precision Supervised Fine-Tuning and Reinforcement Learning from Human Feedback to improve Large Language Model performance for Russian. I specialized in hallucination detection, prompt engineering, and ranking/evaluation of LLM outputs. My work directly supported model alignment and safety in Russian-language AI systems. • Conducted supervised fine-tuning on AI model outputs in Russian. • Performed expert-level reinforcement learning based on human feedback (RLHF). • Developed and applied complex prompt engineering strategies for LLMs. • Evaluated and ranked model outputs for accuracy, truthfulness, and linguistic quality.

2023 - Present

Education

L

Lomonosov Moscow State University

Bachelor of Economics, Economics and Management

Bachelor of Economics
2012 - 2016

Work History

S

Self-Employed

Freelance Translator

Subotica
2012 - Present
A

AST Publishing House

Senior Editor and Translator

Moscow
2016 - 2023