TapConvert
Helps people hit exact upload limits on forms and chats by compressing photos, video, and PDFs on-device, with zero server uploads.
AI Automation & Full-Stack Engineer
Hi, I'm Olorunfemi John. I design systems that deliver real business outcomes
Not just code. Production AI pipelines that remove manual work, data tools that respect privacy, and full-stack platforms that hold up under real traffic. Designed end to end, tested, and running in production.
Featured Project
TapConvert
Built for a real compliance headache: government and school forms that reject photos over exact KB limits. TapConvert resizes, compresses, and converts media entirely offline, so users hit upload limits without sending sensitive files to a server. Built with a 10-module clean architecture and full zero-mock contract tests.
"I think in systems, not tickets. Every build starts from the business goal, gets designed end to end, and ships with tests, recovery, and monitoring. If it cannot run in production, it does not ship."
About
What I Do
AI Automation & Pipelines
Scheduled research, media, and data pipelines that run on their own and report when they fail. Less manual ops, lower cost.
Full-Stack Web Platforms & SaaS
Commercial products with billing, auth, and real users, from database to deployed UI. Built to hold up under real traffic.
Python Data & Media Engines
High-throughput extraction, voice, and video pipelines that skip disk bottlenecks and keep private data private.
Android & Accessible Web
Offline-first mobile apps and WCAG-compliant web that real people rely on, including assistive technology users.
Stack & Capabilities
AI Automation & LLM Pipelines
System Architecture & Design
Kotlin / Jetpack Compose
Android Media3 / FFmpeg
TypeScript / JavaScript
React / Next.js / Vite
Python / FastAPI
Test-Driven Dev (Vitest / Pytest)
Agentic Coding (Claude Code / Cursor / Codex)
Web Accessibility (WCAG 2.2)
Assistive Tech (JAWS / NVDA)
Clean Architecture & MVI
Node.js
Cybersecurity (OWASP)
Chrome Extensions (MV3)
Education & Experience
Strategy. Architecture. Code.
Experience
2026 · Contractor
AudioEye
Web Accessibility Engineer & AT Auditor
Audit and fix enterprise websites for WCAG compliance and assistive technology (AT) compatibility. Build dynamic client-side remediations to fix keyboard navigation, focus hierarchies, and complex ARIA bugs in real time — without direct access to client source code.
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.
2020 – 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. Shipped work includes a live commercial AI SaaS and production data tools.
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.
Research accepted for Springer LNNS publication — WorldS4 2026, London
Publications
Peer-reviewed research
Springer LNNS · Forthcoming
WorldS4 2026 · London, UK
CyberSec: Vulnerability Detection Platform for Ethical Hacking
10th World Conference on Information Communication Systems, Software, Security & Sustainability · 28–30 July 2026
A browser-based platform wrapping SQLMap under legal guardrails so students can run controlled SQL injection scans on approved targets, with structured logging and proof-of-exploit export. Reduced interaction cost by ~95% (377 actions → 20) and learning burden by ~95% with near-zero time overhead — making ethical hacking training accessible, auditable, and teachable at scale.
DOI and citation URL will be available when Springer publishes the WorldS4 2026 proceedings.
Selected Work
Showing 16 projects.
JsonExport
Turns messy nested JSON into clean Excel and CSV files without sending sensitive data to any server.
VideoMascot
Automates mascot and explainer video production, including lip-synced speech, without writing frame files to disk.
Universal Undo
The Ctrl+Z your Android never had. Shake to undo deleted text across any app. 100% offline in under 3MB RAM.
- 500+ installs
- Organic — zero ad spend
- Live on Google Play with in-app purchases
More work
AltPadi
Chrome extension helping Nigerian shoppers compare lower-cost alternatives on Jumia by analyzing price, specs, and rating signals.
Nigerian TTS
Gives creators authentic Nigerian-accent voiceovers on demand, with unlimited generation and no watermarks.
ListingHarvester
Collects listings from multiple sites on autopilot, with crash recovery and clean exports when long runs get interrupted.
MediTrace Health
Hospital management platform built for security research, with documented attack paths and defensive fixes for OWASP Top 10 training.
49Blox — Digital Music Collectibles
Full-stack platform enabling fans to own fractional music rights with real-time orderbooks and secondary trading.
Coddle
Wordle for developers — guess the programming term with color-coded feedback and streak statistics.
Dainty Proofreader
A commercial writing product that polishes grammar, tone, and clarity in real time, with accounts and billing built in.
This Portfolio
Purpose-built portfolio delivering sub-second load times, WebP image pipelines, and modular vanilla architecture without heavy framework bloat.
FreeTrialFinder
Watches AI API credits, free trials, and promo codes across providers, and alerts before money is left on the table.
ImageGenPiper
Produces product and marketing images in bulk through an automated pipeline, instead of one manual prompt at a time.
MotionPicturesToolkit
Turns product info into finished marketing videos automatically, cutting out repetitive editing work.
Researcher Train
Turns raw web input into structured, validated research output through a staged pipeline with checks at every step.
Like what you see?
Get in touch →Services
What I can build for you
AI Automation & Data Pipelines
Research, media, and reporting pipelines that run on schedule, recover from failures, and alert you. Less manual ops, lower cost.
Custom Web Apps
Browser tools and SaaS platforms people pay for. Fast, private, and ready for real traffic from day one.
Android Apps
Offline-first apps people rely on daily, from everyday helpers to deep system utilities. Kotlin, Java, and whatever the problem calls for.
Web Accessibility & WCAG
Audits and fixes that keep you compliant and keep every user in, including screen reader users. Fewer lawsuits, wider reach.
Chrome Extensions
Store-ready extensions that remove busywork inside the browser. Manifest V3 ready.
Freelance Development
Contract builds and feature work with clear docs and tests. You own everything I ship. Let's talk about what you need.
Writing
Deep dives & dev notes
How Benchmarking My Security Project Made Me Build JsonExport
I built an automated security testing tool that logged thousands of scan metrics in JSON. Turning those machine logs into readable tables without risking data privacy pushed me to build JsonExport.
The Undo Button Your Phone Should Have Had
I spent 10 minutes writing a long WhatsApp message, accidentally selected all the text, and watched it vanish. That's when I decided to build Universal Undo.
Why I Built an App That Replaces Your Camera Feed
I wanted to understand how Android's camera system really works. So I built a tool that intercepts the camera at every level — legacy, Camera2, and CameraX.
Let's build something
Got a project, a question, or just want to talk code? I'm available.