Open to opportunities

John Jesuyon User

@johnjesuyon

AI Engineer building agentic systems and senior mobile apps, shipping low-latency LLM features with clean Flutter architecture.

Nigeria

Message

What I'm looking for

I want to build production-grade agentic AI and mobile experiences, owning end-to-end pipelines with low-latency LLM/RAG, clean architecture, and measurable impact. I’m excited to work in teams that value engineering rigor, testing, and fast iteration.

I’m an AI Engineer and senior mobile developer with 4+ years shipping production apps across fintech, logistics, and e-commerce. I build agentic AI that feels real-time and intuitive—turning voice and text into actions users can execute inside the app.

Currently at MiPloy, I designed and shipped a full voice-to-action assistant pipeline (speech-to-text, intent recognition, NLP, and action execution) integrated into a React Native app used by 5,000+ users. I also co-developed YOUi, an internal proprietary framework that standardizes UI components, state management architecture, and a design system for consistent frontend delivery.

Beyond the product work, I’ve deployed and researched AI systems end-to-end: a clinical RAG system on Cloudflare Workers (500+ API calls), an adversarial fairness framework for hiring with actionable XAI recourse feedback, and a graph-based multi-agent orchestration engine using LangGraph with provenance tracking. My approach is deep engineering—clean architecture, rigorous testing, and practical LLM/RAG integration across the stack.

Experience

Work history, roles, and key accomplishments

Current

AI Engineer & Mobile Developer

Current

MiPloy

Aug 2025 - Present (10 months)

Architected and shipped a full voice-to-action agent pipeline for a React Native app, enabling natural-language navigation and execution of app features. Integrated STT, intent recognition, NLP, and real-time action execution and contributed to a frontend-to-LLM API stack used by 5,000+ users.

React Native NLP Action Execution Firebase State Management

Senior Mobile Developer

DoMyHeritage

Jan 2025 - Jul 2025 (6 months)

Built a cross-platform property marketplace (lease, rent, buy) with a seamless checkout flow using scalable Bloc state management. Collaborated with UI/UX and backend teams to deliver end-to-end payment and transaction experiences.

Flutter Dart BLoC Firebase Checkout Flow Payment Integration CI CD

Mobile Developer

TransferXO

Jan 2023 - Dec 2024 (1 year 11 months)

Engineered a cross-platform blockchain payments app, improving transaction speeds by 50% and reducing bug rates by 40% through CI/CD pipeline integration and systematic code reviews. Integrated blockchain APIs to support seamless cross-border payment experiences with a design, backend, and QA team.

Flutter Dart BLoC CI CD Code Review REST APIs Cross Border Payments Debugging

Mobile Developer

Recon

Jan 2024 - Feb 2024 (1 month)

Delivered a mobile payment and investment app achieving 50% faster transaction times by integrating APIs for local transfers, airtime purchases, and investments. Led adoption of clean architecture and performed thorough testing to improve stability and reliability.

Flutter Dart Testing Airtime Purchase APIs Performance Optimization Mobile Payments

Mobile Developer

Pickbox

Jan 2023 - Mar 2023 (2 months)

Built a logistics and delivery app that reduced average delivery time by 70% by integrating real-time tracking APIs for accurate last-mile updates. Implemented mobile delivery workflows using Flutter and GetX state management.

Flutter Dart GetX Tracking APIs Last Mile Delivery API Integration State Management Performance Optimization Testing

Mobile Developer

NextSwitch

Jan 2022 - Feb 2023 (1 year 1 month)

Led development of an e-commerce platform that increased user engagement by 65% and implemented secure payment gateway integrations. Built GetX-managed features with clean architecture principles to support reliable commerce flows.

Flutter Dart GetX Payment Gateways E commerce Support API Integration State Management Mobile App Development

Education

Degrees, certifications, and relevant coursework

Lagos State University

Bachelor of Science, Electronics & Computer Engineering

2019 - 2024

Grade: 3.99/5.0

Activities and societies: Best Student Engineering Mathematics VI; Prize in Fundamentals of Electrical Engineering. ICEPT 2024/NIEEE (Abuja) 2nd Best Paper Award for an IoT-Based Parking System for Smart Cities.

B.Sc. in Electronics & Computer Engineering at Lagos State University (Feb 2019–Feb 2024), graduating with a CGPA of 3.99/5.0 (WES Canada equivalent: 3.4/4.0). Received Best Student Engineering Mathematics VI and a Prize in Fundamentals of Electrical Engineering.