Helios O.

Key Skills

Software

Internal/Proprietary Tooling

Top Subject Matter

Media

Health

Internet

Top Data Types

Audio

Top Task Types

Data Collection

Evaluation/Rating

Fine-tuning

Function Calling

Freelancer Overview

Hello! My name is Efim and I am a highly skilled sound engineer with over 5 years of experience in the industry. I specialize in providing high-quality audio solutions for clients in various fields, including podcasting, audiobook production, and AI speech technology. I have a passion for helping clients achieve their goals and ensure their audio projects are of the highest quality. My expertise lies in mixing, mastering, editing, and sound design. Alongside traditional media, I have extensive experience in Audio QA and speech testing for AI platforms like play.ht, where I build and optimize high-stakes voice-over datasets for voice cloning and advanced speech applications. I use industry-standard software like Cockos Reaper, Ableton Live, and iZotope RX to deliver exceptional results—whether that means surgical dialogue cleanup, spectral noise restoration, or mastering files to strict platform standards like ACX. Whether you are a podcaster, author, filmmaker, or building AI-driven audio models, I am here to assist you in realizing your vision. I have worked with clients across various formats and am always willing to take on new technical challenges. Let me help you bring your audio projects to life! In addition to my technical expertise, I take great pride in my communication skills and my ability to collaborate with clients. I understand the significance of clear and prompt communication, and I am dedicated to keeping my clients informed and engaged throughout the entire project. If you are seeking a sound engineer to elevate your audio projects, please do not hesitate to contact me. I am eager to hear from you and discuss your project in greater detail!

Labeling Experience

QA AI Audio / QA AI Speech

AudioEvaluation/Rating

QA Audio by play.ht (now part of Meta/Facebook)

2025 - 2025

Education

Work History