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Freelancer Overview
JOHNSTONE KAMANU AI-Powered Developer ā¢ Freelancer ā¢ Nairobi, Kenya š Nairobi, Kenya (Remote-Ready) ā¦ OPEN TO WORK ā IMMEDIATE START š§ [email protected] Toloka Certified Tasker | 4.9 ā Client Rating Top-Rated Freelancer on Upwork PR OFILE A relentless AI builder and freelance developer who doesn't just use AI tools ā he weaponizes them. Specializing in building intelligent automation systems, LLM-powered applications, and high-quality AI training data pipelines that make machines smarter. Trusted by clients across 3 continents to deliver fast, accurate, and scalable AI-driven solutions. 50+ 98% Projects Shipped Accuracy Rate 30+ 3+ Happy Clients Years AI Dev XP EX PER IE NCE Senior AI Freelance Developer 2022 ā Present Independent ā Upwork / Contra / Direct Clients ā¢ Built 15+ production-grade LLM-powered applications using OpenAI, Claude, and Gemini APIs for clients across the US, UK, and UAE ā¢ Engineered a custom RAG (Retrieval-Augmented Generation) chatbot for a logistics company ā reduced customer support tickets by 62% ā¢ Developed AI automation scripts that saved clients an average of 20+ hours/week in manual workflows ā¢ Delivered GPT-4 + LangChain content pipelines for a SaaS marketing startup, tripling their content output AI Data Annotator & QA Specialist 2021 ā Present Toloka / Scale AI / Remotasks ā¢ Maintained 98%+ annotation accuracy across 10,000+ tasks spanning NLP, image labeling, and RLHF feedback ā¢ Specialized in RLHF (Reinforcement Learning from Huma