Mumbi Felistus

Key Skills

Software

OneForma

Toloka

CVAT

Other

Appen

Clickworker

Axiom AI

Top Subject Matter

LLM Optimization

Multimodal AI

Voice Data

Top Data Types

Text

Image

Document

3D Sensor

Audio

Top Task Types

Transcription

Segmentation

RLHF

Mapping

Freelancer Overview

Senior Data Annotator. Brings 2+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Outlier, Toloka, and CVAT. Education includes Doctor of Philosophy, N/A (2023) and Master of Science, N/A (2023). AI-training focus includes data types such as 3D Sensor, Text, and Image and labeling workflows including Segmentation, RLHF, and Transcription.

Labeling Experience

Image Annotator

CVATImageSegmentation

I performed image segmentation and object detection tasks for various industry projects, supporting retail and urban planning applications. My role required applying expert-level knowledge in bounding boxes, polygons, and semantic segmentation. High annotation standards and adherence to platform guidelines were consistently maintained. • Used CVAT and LabelImg for image annotation tasks. • Applied 2D/3D bounding boxes and semantic segmentation techniques. • Projects included retail inventory management and city infrastructure mapping. • Consistently achieved platform quality score benchmarks.

I performed image segmentation and object detection tasks for various industry projects, supporting retail and urban planning applications. My role required applying expert-level knowledge in bounding boxes, polygons, and semantic segmentation. High annotation standards and adherence to platform guidelines were consistently maintained. • Used CVAT and LabelImg for image annotation tasks. • Applied 2D/3D bounding boxes and semantic segmentation techniques. • Projects included retail inventory management and city infrastructure mapping. • Consistently achieved platform quality score benchmarks.

2020 - Present

RLHF Data Annotator and Prompt Engineer

TolokaTextRLHF

I contributed to RLHF projects for Large Language Models, ranking model outputs and identifying hallucinations. I evaluated LLM responses for accuracy, safety, and factual consistency, influencing model fine-tuning processes. Tasks were executed using prompt engineering to design and evaluate AI behavior. • Specialized in RLHF for LLM training and evaluation. • Conducted prompt engineering and model assessment tasks. • Worked with platforms including Outlier and Toloka. • Focused on linguistic accuracy and reduction of AI-generated errors.

I contributed to RLHF projects for Large Language Models, ranking model outputs and identifying hallucinations. I evaluated LLM responses for accuracy, safety, and factual consistency, influencing model fine-tuning processes. Tasks were executed using prompt engineering to design and evaluate AI behavior. • Specialized in RLHF for LLM training and evaluation. • Conducted prompt engineering and model assessment tasks. • Worked with platforms including Outlier and Toloka. • Focused on linguistic accuracy and reduction of AI-generated errors.

2020 - Present

Senior Data Annotator

3D SensorSegmentation

I performed high-precision labeling for autonomous vehicle systems using 3D Point Cloud and LiDAR data. My responsibilities included segmenting and annotating objects within point clouds, focused on improving accuracy for machine learning applications. I maintained a quality score of 95%+ while managing deliverables across several global platforms. • Expertise in 3D Point Cloud segmentation and object annotation. • Used platforms such as Outlier, Toloka, and iMerit to complete projects. • Managed labeling for diverse industries including automotive and urban planning. • Ensured all labeling met client and platform quality guidelines.

I performed high-precision labeling for autonomous vehicle systems using 3D Point Cloud and LiDAR data. My responsibilities included segmenting and annotating objects within point clouds, focused on improving accuracy for machine learning applications. I maintained a quality score of 95%+ while managing deliverables across several global platforms. • Expertise in 3D Point Cloud segmentation and object annotation. • Used platforms such as Outlier, Toloka, and iMerit to complete projects. • Managed labeling for diverse industries including automotive and urban planning. • Ensured all labeling met client and platform quality guidelines.

2020 - Present

Transcription & Linguistic Specialist

OtherAudioTranscription

I transcribed audio and video files from Swahili to English with a focus on grammatical precision and data accuracy. My transcription tasks supported international clients in linguistic and marketing projects within East Africa. I developed protocols for large-scale project management and data integrity. • Specialized in bilingual transcription (Swahili-English). • Conducted sentiment analysis for localized datasets. • Managed strict client guidelines across high-volume workloads. • Ensured delivery of consistent and accurate transcripts.

I transcribed audio and video files from Swahili to English with a focus on grammatical precision and data accuracy. My transcription tasks supported international clients in linguistic and marketing projects within East Africa. I developed protocols for large-scale project management and data integrity. • Specialized in bilingual transcription (Swahili-English). • Conducted sentiment analysis for localized datasets. • Managed strict client guidelines across high-volume workloads. • Ensured delivery of consistent and accurate transcripts.

2018 - 2019

Urban Research Assistant

OtherMapping

I collected, processed, and labeled geographic data for urban planning projects in Nairobi as a research assistant. I utilized digital mapping tools to categorize and annotate field data for architectural and infrastructure modeling. My labeling ensured accurate integration of field data with planning platforms. • Used digital tools for mapping and geospatial data annotation. • Focused on accuracy in categorizing urban field data. • Supported architectural modeling through data validation. • Enhanced data quality for city planning projects.

I collected, processed, and labeled geographic data for urban planning projects in Nairobi as a research assistant. I utilized digital mapping tools to categorize and annotate field data for architectural and infrastructure modeling. My labeling ensured accurate integration of field data with planning platforms. • Used digital tools for mapping and geospatial data annotation. • Focused on accuracy in categorizing urban field data. • Supported architectural modeling through data validation. • Enhanced data quality for city planning projects.

2018 - 2018

Education

Work History