Sudrajat

Key Skills

Software

Other

Top Subject Matter

LLM response evaluation

RLHF quality/ranking

hallucination detection

Top Data Types

Text

Audio

Document

Top Task Types

RLHF

Mapping

Freelancer Overview

AI Trainer & Data Annotation Specialist (Freelance) | Dataannotation.com / Outlier.ai. Brings 3+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Outlier.ai, Other, and QGIS. Education includes Bachelor of Biology, Universitas Islam Negeri Sunan Gunung Djati Bandung (2024). AI-training focus includes data types such as Text, Audio, and Geospatial and labeling workflows including RLHF, Evaluation, and Rating.

Labeling Experience

AI Trainer & Data Annotation Specialist (Freelance) | Dataannotation.com / Outlier.ai (Audio/TTS assessment)

OtherAudio

Performed voice and TTS quality evaluation by assessing audio samples for perceptual speech qualities. Applied consistent rating criteria to support refinement of speech AI model outputs across project cycles. Ensured labeled outputs reflected pacing, intonation, naturalness, and accent quality. • Assessed 200+ voice/TTS audio samples per cycle for pacing, intonation, and naturalness. • Evaluated accent quality to improve speech AI rendition accuracy. • Maintained reliable throughput with low revision-request rate (<5%). • Supported iterative model improvement through cycle-based audio labeling.

2023 - Present

AI Trainer & Data Annotation Specialist (Freelance) | Dataannotation.com / Outlier.ai

TextRLHF

Freelance AI Trainer and Data Annotation Specialist performing RLHF evaluation and response ranking using pairwise comparisons. Labeled and rated AI outputs for quality, hallucination presence, and instruction-following correctness across diverse prompt types. Conducted web page quality ratings using SQRG criteria including E-E-A-T and YMYL constraints. • Evaluated 1,000+ AI responses for RLHF ranking and pairwise preference signals. • Flagged hallucinations, factual errors, and instruction-following failures to reduce dataset noise. • Applied Google Search Quality Rater Guidelines (SQRG) to rate 500+ pages against E-E-A-T and YMYL. • Produced structured error cluster feedback reports for multi-turn conversation annotation guideline optimization.

2023 - Present

Wildlife Field Researcher | BKSDA West Java / The Aspinall Foundation

Mapping

Wildlife field research work involving systematic categorization of observed events to produce structured behavioral datasets. Mapped animal home ranges using GPS tracking within a defined territory using QGIS. Produced geospatially grounded outputs used in conservation reporting and evidence-based management decisions. • Recorded and categorized 326 primate feeding events across 16 plant species. • Mapped home ranges for 4 Javan Gibbon groups using QGIS and GPS tracking. • Achieved spatial accuracy within ~5 meters resolution. • Produced a final research report submitted to BKSDA West Java.

2022 - 2023

Education

Work History