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Opeoluwa Siyanbola
Open to opportunitiesFull Stack Developer
I build scalable, AI, web, and mobile products with React, React Native, Node.js, and cloud infrastructure.
NigeriaFull Stack Developer at Pastel Africa
About
I've built full-stack products for Pastel Africa, Turing, Topcoder, Spoxio, and Startupia across fintech, AI, pharma, content, and sports. My work spans secure payment systems, AI-assisted fraud detection, LLM evaluation, and cross-platform applications.
At Pastel Africa, I implemented AI-assisted fraud detection and real-time transaction-risk monitoring, multi-application dashboards with centralized authentication, and payment-routing systems that improve transaction success and uptime. I also developed secure integrations with banking systems, payment gateways, and financial service providers for high-volume processing.
At Turing, I helped improve Google Gemini through human-in-the-loop training, evaluating AI-generated TypeScript code, testing model-generated solutions, and producing structured feedback for safer, more reliable LLM behavior.
I've also delivered React, Next.js, Node.js, Express, and React Native applications for a global pharmaceutical enterprise, a sports platform, and fintech products including agricultural matching, fundraising, KYC, and peer-to-peer cryptocurrency exchange systems.
Experience
Full Stack Developer
Implemented AI-assisted fraud detection and real-time transaction risk monitoring. Designed a multi-application dashboard with centralized authentication and permission management.
React NativeTypeScriptReduxReact QueryShadcn UiREST APIs