About Letlhogonolo
I bridge the gap between complex AI technology and reliable business solutions. Specializing in RAG (Retrieval-Augmented Generation), LLMs, and Automation, I build robust chatbots and data tools using Python, LangChain, and FastAPI. My focus is not just on making it work, but on making it accurate through rigorous QA.
English
Native or bilingual
Tswana
Native or bilingual
Can work on-site
Pretoria (up to 50km)
Experience
- Outlier.aiI Quality Assurance & RLHF EngineerJuly 2024 - October 2025 (1 year and 3 months)Acted as a specialized AI Trainer and Quality Assurance Engineer, focusing on Reinforcement Learning from Human Feedback (RLHF) to improve Large Language Models (LLMs).Adversarial Testing: Conducted rigorous "red-teaming" to identify model hallucinations and safety risks, proactively tricking the model to find flaws.Code Evaluation: Created "gold standard" Python code solutions to train the model on correct syntax, logic, and efficiency.Performance Improvement: Evaluated model outputs against strict quality guidelines, directly contributing to increased accuracy and reduced bias in the final deployment.
- Kwantu PTY LTDAI Solutions Engineer (RAG Specialist)October 2024 - April 2025 (6 months)Cape Town, South AfricaDesigned, built, and deployed enterprise-grade AI chatbots using Retrieval-Augmented Generation (RAG).RAG SQL Chatbot: Developed a system using LangChain to allow users to query a complex SQL database using natural language (e.g., for infrastructure projects in Malawi).QA & Validation: Built automated testing scripts to compare AI-generated answers against ground-truth database records, identifying and fixing hallucinations.Infrastructure: Deployed the full stack (React frontend, FastAPI backend) on a CentOS server, configuring Nginx, Supervisor, and Docker for production stability.Tech Stack: Python, LangChain, OpenAI API, PostgreSQL/SQLite.
- TranslatedAI Prompt Engineer & EvaluatorOctober 2024 - December 2024 (2 months)Optimized AI model performance for a major GPU enterprise client, focusing on high-stakes domains (Medical, Legal, Finance).Prompt Engineering: Refined complex prompts to ensure model outputs met strict industry standards for accuracy and tone.RLHF Application: Applied human feedback techniques to rank and improve generated responses, reducing error rates in specialized technical queries.
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Education
- National Diploma: Analytical ChemistryTshwane University of Technology2015National Diploma: Analytical Chemistry
- National Senior Certificate: Grade 12Pretoria Technical High School2009National Senior Certificate: Grade 12