Web, Android & AI Developer
Hi, I'm Olorunfemi John. I build tools people actually use
Full-stack web platforms, AI-powered tools, and Android apps — from LLM integrations and autonomous agents to deep system-level utilities. If it solves a real problem, I'm probably already building it.
JsonExport
Convert nested JSON to Excel, CSV, HTML — handles 100MB files, all client-side, zero server. Monaco editor, smart flattening, instant exports. Privacy-first: your data never leaves your browser.
"I've built autonomous AI agents, apps that hook into the Android camera pipeline, and tools that handle 100MB files without touching a server. Basically, I like the problems most people would rather skip."
About
What I Do
I build web apps — from full-stack platforms with live marketplaces to AI-powered tools that orchestrate language models behind the scenes. On the Android side, I make everyday apps like a universal undo button for your phone, all the way to system-level modules that hook into how Android works under the hood. What ties it all together is a love for solving real problems cleanly.
Stack
Education & Experience
Strategy. Architecture. Code.
Experience
2025 – Present
UtilityFirst
Technical Lead / Architect
Lead technical strategy and architecture — translating product goals into system designs, choosing stacks and engineering patterns, and building the core platform. Full ownership from specification through shipped code.
2022 – Present
Independent Developer
Freelance · Web & AI Solutions
Design and build full-stack platforms, AI-powered tools, and automation systems end-to-end. Every project begins with requirements analysis and architecture planning — then implementation, deployment, and iteration.
Education
Graduated 2023 · Second Class Upper (2.1)
B.Sc. Computer Science
Kogi State University, Anyigba
Built foundations in software engineering, systems design, and algorithmic thinking — the base that makes architecture decisions second nature.
Convocation 2026 · Second Class Upper (2.1)
M.Sc. Cyber Security
University of Ibadan
Deepened expertise in secure systems architecture, threat modeling, and building resilient infrastructure that stands up to real-world attacks.
Selected Work
Like what you see?
Get in touch →Services
What I can build for you
Custom Web Apps
Browser-based tools, full-stack platforms, and dashboards. Fast, privacy-first, and built to handle real workloads.
AI & LLM Integration
Custom AI agents, LLM-powered features, and intelligent automation built into web and mobile products. From prompt engineering to full pipeline orchestration.
Android Apps
From everyday productivity helpers to deep system-level utilities. Kotlin, Java, and whatever the problem calls for.
Chrome Extensions
Sidebar tools, page enhancers, and workflow automations for the Chrome Web Store. Manifest V3 ready.
Freelance Development
Available for contract work, feature builds, and hands-on technical problem-solving. Let's talk about what you need.
Writing
Deep dives & dev notes
Let's build something
Got a project, a question, or just want to talk code? I'm available.