Full-Stack, Mobile Systems & Python Engineer
Hi, I'm Olorunfemi John. I build software that drives real business outcomes
From 100% offline Android apps with clean multi-module architecture to in-memory Python media pipelines, enterprise accessibility, and client-side web tools handling 100MB datasets. Test-driven, modular, and built for real performance — not superficial AI wrappers.
TapConvert
100% offline media compressor and converter for Android. Resize photos to exact KB limits for passport/visa forms, compress videos for Discord & WhatsApp, extract audio, and stitch clean PDFs with zero cloud uploads or tracking. Built with a 10-module clean architecture and full zero-mock contract tests.
"I build software for real outcomes: 100% offline Android apps with modular architectures, in-memory media streaming pipelines, client-side tools handling 100MB datasets, and enterprise accessibility systems. Test-driven, performant, and privacy-first."
About
What I Do
Android & Connected Mobile Apps
Clean, responsive mobile apps with modern UI (Kotlin/Compose), reliable state management, and seamless cloud/API integration.
Full-Stack Web Platforms & SaaS
High-performance web applications, interactive marketplaces, and secure backend APIs built for real user traffic.
Python Automation & Media Engines
High-throughput data extractors, automated video/audio processing pipelines, and AI workflows that cut operational costs.
WCAG Accessibility & Compliance
Enterprise WCAG compliance, screen-reader compatibility, and test-driven architecture that protects business reputation.
Stack & Capabilities
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.
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.
Web Accessibility & WCAG
Audits and dynamic client-side remediations for WCAG 2.1/2.2 compliance, screen reader support (NVDA, JAWS), keyboard navigation, and ARIA widgets.
Python & AI Pipelines
Custom animation engines (VideoMascot), LLM integrations, and media automation workflows built for scale and low memory footprint.
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.