Onuorah K.

Key Skills

Software

Mercor

Other

Top Subject Matter

Frontier AI model training

Fine-tuning Domain Expertise

and RLHF human feedback preference datasets.

Top Data Types

Text

Computer Code Programming

Image

Top Task Types

RLHF

Prompt + Response Writing (SFT)

Data Collection

Object Detection

Text Generation

Freelancer Overview

AI Trainer & Data Annotator — Mercor & Handshake.ai (Remote). Brings 2+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Data Labelling, AI Training, High Level Prompting and Other. Education includes Bachelor of Science, University of Nigeria Nsukka (2019). AI-training focus includes data types such as Text and labeling workflows including RLHF, Prompt + Response Writing (SFT), and Data Collection.

Labeling Experience

AI Trainer & Data Annotator — Mercor (Handshake.ai) (Remote)

MercorTextRLHF

Provided high-quality data annotation, labeling, and preference data for frontier AI model training and fine-tuning. Performed response evaluation, ranking, and RLHF tasks to improve model reasoning, safety, and performance. Applied engineering expertise to support complex technical annotation workflows at scale. • Preference data creation and labeling for fine-tuning. • Response evaluation and ranking for RLHF. • Technical annotation aligned with frontier AI training needs. • Scaled labeling workflows using software engineering practices.

2024 - Present

Backend Engineer — Fitnessspace (Remote)

OtherTextPrompt + Response Writing (SFT)

Developed backend systems for an AI-powered wellness app with capabilities supporting AI-driven personalization. Contributed to implementation of AI features that generate personalized workout and nutrition content based on user needs. Worked on production integration of AI-related functionality within the app backend. • Built AI-powered workout generation features. • Built AI-driven nutrition personalization features. • Implemented backend services supporting model-driven recommendations. • Integrated AI functionality into a cloud-based Node.js stack.

2023 - Present

Team Lead & Fullstack Developer — Yarna (Remote)

OtherTextData Collection

Managed development of a multi-tenant AI Ads SaaS platform. Enabled AI-driven advertising workflows within a scalable platform architecture. Focused on engineering leadership to support AI-enabled product capabilities across tenants. • Platform leadership for AI ads SaaS. • Multi-tenant architecture support. • Enabled AI-enabled advertising workflows. • Delivered features for multiple client tenants.

2025 - 2025

Education

Work History