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Casey OtienoCO
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Casey Otieno

@caseyotieno

AI evaluation and data scientist at Tensium, building reproducible reinforcement learning tasks with clear grading criteria.

Kenya
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At Tensium, I build AI and data pipelines and reinforcement learning environments with clear outcomes and grading criteria. I test tasks with Harbor and Claude models, then refine their wording, tests, and setup before review.

At Turing, I reviewed GitHub issues for realistic coding tasks used in LLM evaluation and AI training. I reproduced bugs and documented the steps needed to assess task clarity and correctness.

My project work includes a multimodal RAG proof of concept for searching structured and unstructured PDFs, combining retrieval and reranking to produce answers with citations. I also contributed to AI development for Nuru Women, an open-source women’s health platform that won Best Nostr Project at Hack4Freedom Nairobi 2026.

Across research and analytics projects, I’ve used Python, SQL, and Excel to turn data into analysis and reports. My work has included financial research, dashboards, and predictive modeling.

Experience

Work history, roles, and key accomplishments

CL

Data Annotation Specialist

CloudFactory

May 2026 - Oct 2026 (5 months)

Annotated roofs on the NearmapRG platform, following detailed project guidelines for accuracy and consistency. Completed training and assessments through TalentLMS and used VPN, JIRA, and Slack to coordinate tasks.

TU

Python and Git Developer

Turing

Sep 2025 - Apr 2026 (7 months)

Reviewed GitHub issues in open-source repositories to identify realistic coding tasks for LLM evaluation and AI training. Set up repositories, installed dependencies, reproduced bugs, and reviewed tests to assess task suitability for benchmarking.

AA

Data and Market Research Intern

Agema Analysts

Jul 2025 - Jan 2026 (6 months)

Researched companies, industries, financial performance, and market risks to support advisory and investment work. Turned research findings into reports, summaries, and presentation materials to support business decisions.

SS

Data Analyst and Junior Stock Market Trader

SBG Securities

Oct 2024 - May 2025 (7 months)

Analysed equities, bonds, company performance, and market movements to support trading insights for the Nairobi Securities Exchange. Used Excel, Python, and Tableau to organise, validate, and visualise financial data.

WE

Data Specialist in Web3 Security Analytics

Webacy

May 2024 - Jul 2024 (2 months)

Analysed smart-contract vulnerability data, labelled risk patterns, and checked peer annotations for consistency. Used Excel, Python, and Tableau, alongside frequency and correlation analysis and clustering concepts, to categorise risks and report trends.

ST

Mathematics and Statistics Tutor

StudyPool

Jan 2021 - Oct 2022 (1 year 9 months)

Helped learners understand mathematics, statistics, quantitative reasoning, and data interpretation, using Excel, Python, R, and MATLAB where relevant.

Education

Degrees, certifications, and relevant coursework

MK

Multimedia University of Kenya

Bachelor of Science, Mathematics and Computer Science

2018 - 2023

Bachelor of Science in Mathematics (Statistics) and Computer Science from Multimedia University of Kenya, completed in 2023.

FR

freeCodeCamp

Data Analysis with Python, Data Analysis

Completed the Data Analysis with Python certification.

DA

DataCamp

Associate Data Scientist, Data Science

Completed the Associate Data Scientist track and courses in Introduction to Python, Intermediate Python, Understanding Data Science, and Supervised Learning with scikit-learn.

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