Stephen.dev
Available for new opportunities

Architecting secure systems & intelligent interfaces.

Senior Frontend Engineer & UI/UX Designer specializing in React, TanStack Start, and high-performance server architectures. I build scalable, production-grade applications that solve complex problems.

High Performance

Expertise in ultra-low memory footprint backends using Rust and scalable serverless edge computing via Cloudflare Workers.

Enterprise Security

Building secure financial pipelines, wallet management, and robust authentication layers utilizing Supabase & robust cryptography.

AI/ML Integration

Integrating predictive analytics, Gemini/OpenAI models, and custom TensorFlow deployments into reactive user interfaces.

Full-Stack Ecosystem

Mastery across the stack, from interactive UI to low-level systems.

Tech Core

Full-Stack Mastery

React 19
Rust
Python
TensorFlow
Cloudflare
Supabase
TanStack
Tailwind CSS
Node.js
Next.js

Professional Experience

A track record of building robust systems and leading technical teams.

2023 — Present

Lead Full-Stack Developer

Vault OS

Leading the architectural design and implementation of a highly resilient financial command center handling multi-currency wallets, complex KYC onboarding, and sub-50ms integrations with Stripe and M-Pesa. Spearheaded edge-compute deployments ensuring 100% ACID compliance.

2022 — 2023

Core Technical Advisor & Developer

Smart Blossoming Foundation

Engineered a highly performant, bilingual wellness portal capable of operating flawlessly on low-bandwidth connections. Designed and implemented complex psychological quantitative growth-tracking metrics secured locally via edge-compute infrastructure.

2019 — 2022

Founder & Operator

Cyber Cafe & PS4 Hub

Successfully launched and managed a local gaming and internet hub, honing skills in hardware management, local networking, customer relations, and business operations. Gained deep exposure to Linux environments and foundational networking concepts.

Featured Engineering

A selection of production systems and architectural explorations.

Production Live AppLead Full-Stack Developer

Vault

A secure financial command center. Features full wallet management, real-time ledger accounting, secure withdrawal validation pipelines, KYC onboarding, and integrations for Stripe Checkout, custom Stripe Issuing cards, and M-Pesa (Daraja API) callback processing. Includes a Gemini-powered AI financial advisor.

React 19TanStack StartSupabaseVite 7Tailwind 4Flutter
Production Live AppCreator & Full-Stack Engineer

Codevia

An interactive learning workspace that synchronizes structured YouTube video programming directly with an in-browser, VS Code-like Monaco code editor engine. Leverages reactive state management for real-time code execution and persistence.

AngularAngular SignalsSupabase Auth/DBMonaco EditorYouTube Player API
Production Live AppCore Technical Advisor & Developer

Smart Blossoming Foundation

A high-performance, bilingual (English & Kiswahili) wellness and personal transformation portal. Built to scale via Cloudflare serverless workers, featuring an integrated quantitative growth rating dashboard that metrics-tracks progress categories.

TypeScriptCloudflare WorkersTailwind
Architectural Deep-DiveSystems Engineer

Mental Health Diary Backend

A ultra-high-performance, low-memory footprint server architecture built to process high-concurrency requests. Implements a customized engine processing binary audio data stream to execute instant automated text transcriptions via asynchronous endpoints.

Rust (Actix-web)PythonPLpgSQLPostgreSQL
Architectural Deep-DiveML Developer

fpredict

A data-driven predictive sports analytics engine compiled for English Premier League match cycles. Employs historical sequence datasets, expected goals calculations, and feature engineering to model upcoming fixture outcomes.

PythonScikit-LearnTensorFlowHTML
Architectural Deep-DiveAI/Backend Engineer

TherapistGPT Engine

A specialized REST API suite hosting fine-tuned neural models for audio feature classification, emotion state parsing, and cognitive counseling assistance responses.

PythonDjango REST FrameworkTensorFlow

Let's build something great.

I'm currently exploring new opportunities to architect complex systems and build beautiful interfaces. Feel free to reach out.

The Un-Git-Tracked Epoch

A philosophical nod to missing repositories. Before rigid version control workflows, there was a deep history of low-level systems experimentation, memory management, and foundational coding. These missing commits represent a long-standing engineering instinct that laid the groundwork for today's scalable, high-performance architectures.