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Sulthan JosiahSJ
Open to opportunities

Sulthan Josiah

@sulthanjosiah

I evaluate voice AI and create commercial generative AI visuals for brands and training pipelines.

Indonesia
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What I'm looking for

I'm looking to bring my mix of speech-to-speech AI evaluation, generative AI content creation, and analytical project experience to high-impact AI training and evaluation projects.

I've contributed 103+ hours of speech-to-speech AI evaluation for Scale AI via Outlier, assessing multilingual voice outputs for naturalness, utility, audio quality, and conversational dynamics.

I identify hallucinations, interruption failures, embodied-experience claims, and audio artifacts, then write structured English-language justifications to support AI training data pipelines. I qualified for the advanced Live S2S Arena track after passing the Aether S2S Quality Screener, Stereo Headphone Check, and Audio Discrimination Test.

As a freelance AI content creator, I turn raw product images into photorealistic commercial staging, virtual apparel, UGC, architectural visualizations, and social assets designed for Instagram, TikTok, and marketplace listings. I've also created Kai, a consistent AI virtual influencer across 50+ images, and designed 200+ AI-generated tarot card illustrations using a custom visual system.

Earlier, I built an integrated project-monitoring dashboard at MIND ID, tracking 10+ strategic mining projects through Earned Value Management. My engineering background combines analytical project work with practical AI evaluation and creative production.

Experience

Work history, roles, and key accomplishments

Scale AI logoSA

Voice AI Quality Evaluator

Jul 2026 - Aug 2026 (1 month)

Contributed 103+ hours of speech-to-speech AI model evaluation, supporting training data pipelines for leading AI laboratories. Evaluated outputs across naturalness, utility, audio quality, and conversational dynamics, and identified model error patterns.

Education

Degrees, certifications, and relevant coursework

Universitas Indonesia logoUI

Universitas Indonesia

Bachelor of Engineering, Metallurgy and Materials Engineering

Grade: 3.44 / 4.00

Pursued a Bachelor of Engineering in Metallurgy and Materials Engineering, graduating in 3.5 years with a GPA of 3.44 out of 4.00.

Tech stack

Software and tools used professionally

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