Kelvin Nkandu

Kelvin Nkandu

About

Detail

AI Trainer | Audio & Speech Data Specialist | Generative AI | RLHF | Supervised Fine-Tuning (SFT) | Prompt Tuning | LLM Annotation & Evaluation | Data Qualit...
Lusaka, Lusaka Province, Zambia

Contact Kelvin regarding: 
work
Full-time jobs

Timeline


work
Job
school
Education

Résumé


Jobs verified_user 0% verified
  • micro1
    Video Data Annotator
    micro1
    Apr 2025 - Current (1 year 6 months)
    Annotate and classify video, image, and audio data to support AI model training for computer vision and multimodal learning. Perform quality assurance and peer reviews to maintain annotation accuracy above 98%. Follow detailed labeling guidelines and adapt to evolving project requirements from data science teams. Use tools such as Labelbox, CVAT, and custom annotation platforms for precise data tagging and management. Collaborate with ML engineers to resolve edge cases and enhance annotation standards. Conduct data cleaning and organization, ensuring consistent and reliable datasets for downstream model development. Show less
  • Outlier
    Audio/Image Data Annotator
    Outlier
    Sep 2024 - Dec 2024 (4 months)
    Labeled and reviewed audio clips and image datasets used in training multimodal AI models. Identified and categorized audio artifacts such as distortion, echo, background noise, and clipping to ensure data clarity. Maintained annotation accuracy above 98% through meticulous quality control and peer review. Leveraged annotation tools such as Labelbox, CVAT, and Audacity to process and organize complex datasets. Provided actionable feedback to ML teams to improve labeling guidelines and reduce ambiguity by 20%. Show less
  • Scale AI
    AI Trainer
    Scale AI
    Jan 2024 - Aug 2024 (8 months)
    Designed and optimized STEM-based prompts for medical and technical LLMs, improving factual accuracy and reasoning by 15%. Developed and applied evaluation rubrics for AI model responses, focusing on quality, safety, and domain relevance. Conducted Supervised Fine-Tuning (SFT) and Prompt Tuning exercises to align models with user intent and context accuracy. Reviewed AI outputs for consistency, logic, and ethical compliance, contributing to benchmark datasets for predictive healthcare tools. Collaborated cross-functionally with ML engineers and linguists to refine annotation workflows and improve annotation precision. Show less
  • ElevenLabs
    Lead Audio Technician
    ElevenLabs
    Jan 2023 - Dec 2023 (1 year)
    Evaluated and classified short audio clips for quality, intelligibility, and artifacts to train high-performance AI speech models. Detected and tagged distortions such as clipping, background noise, and encoding issues, enhancing model accuracy in speech recognition and sound detection. Collaborated with AI researchers to refine audio classification standards, ensuring labeling accuracy above 98%. Utilized Audacity, Labelbox, and custom annotation tools to analyze, annotate, and validate large-scale datasets. Improved dataset audio quality metrics by 15% and reduced labeling ambiguity by 20% through feedback-driven QA cycles. Contributed to the development of next-generation voice AI models deployed in global applications. Show less
Education verified_user 0% verified
  • T
    The Copperbelty Unversity — Bachelor's degree, Computer Systems Networking and Telecommunications
    The Copperbelty Unversity
  • l
    Levy Mwanawasa Medical University — MBChB, Medicine
    levy Mwanawasa medical university
This is a community-created genome.