Louis O.

Key Skills

Software

Appen

Other

Top Subject Matter

Machine learning training data annotation (text)

Machine learning training data annotation (images)

Machine learning training data annotation (audio)

Top Data Types

Text

Image

Audio

Top Task Types

Classification

Freelancer Overview

Data Annotation Specialist (Appen) – Text annotation for ML training. Brings 8+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Appen and Other. Education includes Higher National Diploma, The Federal Polytechnic, Bida. AI-training focus includes data types such as Text, Image, and Audio and labeling workflows including Classification.

Labeling Experience

Freelance Data Annotator – Large-scale client annotation projects

OtherTextClassification

Delivered large-scale data annotation projects for clients across multiple industries. Maintained exceptional accuracy using thorough documentation of procedures and requirements. Coordinated with clients to confirm understanding of task instructions and completion criteria. • Completed multi-project annotation work at scale • Maintained high accuracy with detailed documentation • Worked with clients to clarify requirements • Managed multiple projects while meeting deadlines

2019 - 2024

Data Annotation Specialist (Appen) – Audio annotation for ML training

AppenAudioClassification

Annotated audio datasets for machine learning training while meeting project accuracy expectations. Completed work according to detailed guidelines and ensured consistency across samples. Conducted quality assurance checks and contributed to guideline updates when needed. • Labeled audio samples for ML training • Followed detailed project guidelines • Performed QA and ensured label consistency • Collaborated on guideline improvements

2019 - 2022

Data Annotation Specialist (Appen) – Image annotation for ML training

AppenImageClassification

Annotated image datasets for machine learning training with adherence to strict instructions. Maintained high accuracy by validating labeled outputs and correcting discrepancies. Participated in quality assurance activities and supported process improvements. • Labeled images per ML project requirements • Ensured strict adherence to labeling guidelines • Performed QA checks for label quality • Supported guideline refinement efforts

2019 - 2022

Data Annotation Specialist (Appen) – Text annotation for ML training

AppenTextClassification

Annotated text datasets for machine learning training while strictly following project guidelines. Performed quality assurance checks and verified outputs to ensure high accuracy. Collaborated to support guideline improvements based on review findings. • Labeled text samples for ML training • Followed annotation guidelines with high precision • Conducted QA and accuracy verification • Collaborated on guideline improvement

2019 - 2022

Education

Work History