Full-stack engineering · mobile products · technical ownership

From the mobile screen to the database, I build across the stack.

I’m Toby Matthew, a full-stack and mobile engineer. I lead engineering work across Linguama and Drop—shipping React Native and Next.js product features, backend APIs, data changes, integrations, and release workflows with my teams.

See the work ↓Get in touch

REACT NATIVE / NEXT.JS / NODE.JS / POSTGRESQL / GITHUB ACTIONS

Full-stack + mobileProduction React NativeBackend & data ownershipCI/CD and integrationsAI product engineering

01 / SELECTED WORK

Real products. End-to-end engineering.

I focus on product work where mobile, web, services, data, and operations meet. Project links are included where they are public; private repositories are not exposed.

Lead full-stack & mobile engineer

Linguama

A language-learning product across mobile and web, with lessons, audio, dictionaries, cultural learning, learner progress, and school-facing product systems.

Live website ↗App Store ↗Google Play ↗

Screenshot of Linguama’s live language-learning website — WEBSITE · LIVE · LINGUAMA.COMVisit site ↗

Official Linguama App Store artwork showing the mobile learning home dashboard — IOS APP · HOME & LEARNING PROGRESS · APP STORE ARTWORKApp Store ↗

Official Linguama App Store artwork showing the Igbo culture exploration screen — IOS APP · CULTURE EXPLORATION · APP STORE ARTWORKApp Store ↗

Official Linguama App Store artwork showing the Kiddies Corner learning dashboard — IOS APP · KIDDIES CORNER · APP STORE ARTWORKApp Store ↗

Mobile views are official App Store promotional artwork, linked to Linguama’s current iOS listing.

My engineering scope

Lead engineering work across the React Native app, Next.js web product, APIs, and admin/product surfaces.
Build and maintain full-stack features spanning client UI, backend services, PostgreSQL data models, and migrations.
Work across authentication and authorization, subscriptions/payments, third-party services, and AI integrations.
Contribute to audio, learning-content, analytics, monitoring, and school/student product workflows.

Product architecture & stack

MobileReact Native · Expo · TypeScript

WebNext.js · React · TypeScript

ServicesNode.js · APIs · integrations

DataPostgreSQL · Supabase/Neon · Drizzle

IdentityClerk · auth & access control

Product systemsPayments · audio · AI · analytics

Engineering challenge

Support a coherent learning experience across mobile, web, content systems, accounts, and learner progress—while continuing to ship changes safely.

What this demonstrates

Mobile delivery, API/data ownership, integrations, authentication, migrations, cross-platform product judgment, and team-based release operations.

CTO / technical lead

Drop / Drop AI

AI marketing campaign & content studio

Live product ↗Salient Innovations ↗

Screenshot of the Salient Drop marketing campaign and content studio homepage — LIVE PRODUCT · DROP.SALIENTIN.COMOpen Drop ↗

Technical scope

Technical leadership for Salient Innovations’ live marketing product, from product architecture and backend direction through AI-provider and platform integration.

Systems work

Drop learns brand voice, creates channel-specific campaigns and quick content, supports image/video workflows, seeds a calendar, and uses analytics feedback and team approvals to close the loop.

What it demonstrates

Connecting LLM capability to complete user workflows—not a standalone prompt box—while balancing APIs, durable product data, integrations, and user approval.

Stack

Next.js · TypeScript · Fastify · PostgreSQL · OpenRouter · auth · GitHub Actions

LIVE PRODUCT · SOURCE REPOSITORIES ARE NOT PUBLICLY SHAREABLE

02 / MORE PROJECTS

More projects with visible product evidence.

CarGenie is shown as a screen-recorded mobile prototype using mock data; its API prototype is not connected to the current app.

Expo / React Native · renter & host prototype

CarGenie · car-rental app

I built the mobile frontend for renter and host journeys: onboarding, browsing and filtering vehicles, viewing details, choosing rental dates and pickup options, reviewing quotes and bookings, creating host listings, and responding to mock trip requests.

Mobile frontend

The Expo/React Native app navigates the main renter and host flows with sample data.

API prototype

The public repository also contains an Express API prototype and draft MySQL schema. The backend is not integrated with the current frontend.

CURRENT STATUS · No production deployment is configured. The mobile app is currently unavailable in the App Store.

Current public GitHub repo ↗Open original recording ↗

Screen recording · demo data · App Store listing unavailable

Screenshot of a spa website with service navigation and appointment-booking calls to action — LIVE SITE CAPTURE · SPA BOOKING EXPERIENCEOpen live site ↗

Web product · independent project

Serenity Spa · booking website

I built a responsive spa and wellness site presenting services, reviews, contact information, and appointment-booking calls to action.

Built with Next.js and TypeScript, with a component-based UI and responsive layout. This site and screenshot are linked to the public deployment and repository.

Live website ↗GitHub source ↗

03 / SHIP & OPERATE

CI/CD is part of the feature.

I work with the team on automation that carries application and database changes toward users—rather than treating release as someone else’s problem.

Shared team ownership · GitHub Actions

Release workflows touch more than a web build. Our work includes database migration workflows, application deployments, and mobile OTA update paths. I contribute to maintaining the automation alongside teammates.

The goal is repeatability: tracked schema changes, controlled releases, and a path for mobile fixes that does not require every update to wait for a full store cycle.

01Code & schema changeREVIEWABLE CHANGES

02Migration workflowGENERATE · VALIDATE · APPLY

03Web & API deploymentREPEATABLE RELEASE

04Mobile OTA updateEXPO UPDATES WORKFLOW

These are shared product workflows; exact checks, approvals, and release sequence depend on the repository.

04 / ROLE FIT

Relevant to the team’s stack—with clear boundaries.

These are the technologies I work with across mobile, web, backend, data, identity, integrations, and delivery.

Mobile

React Native · Expo · TypeScript · app releases · OTA updates

Production experience

Web

Next.js · React · TypeScript · responsive product surfaces

Production experience

APIs & services

Node.js · Fastify · REST APIs · integrations · AI/LLM providers

Hands-on engineering

Databases

PostgreSQL · Supabase · Neon · Drizzle · schema design · migrations

Hands-on engineering

Auth & security

Authentication · authorization · API boundaries · secure integration patterns

Full-stack product work

Payments & integrations

Subscription/payment providers · third-party APIs · model/provider integrations

Hands-on product work

CI/CD & cloud delivery

GitHub Actions · migration workflows · deployments · mobile OTA release workflows

Shared team ownership

05 / ADDITIONAL FOCUS

Curious about the systems beneath AI products.

Alongside product engineering, I’m building deeper capability in inference, context, and memory systems. It strengthens how I think about integrating AI into practical products; it is a developing specialization, not a claim of GPU-inference production experience.

Inference · context · memory

Current study and project direction: understand model-serving behavior, context construction, memory use, and performance trade-offs. My main professional positioning remains full-stack and mobile engineering.

06 / CONTACT

Let’s talk about what needs building.

Full-stack features · mobile products · APIs · integrations · delivery systems

EMAIL
trobini18@gmail.com

LINKEDIN
LinkedIn profile ↗

GITHUB
github.com/tobymatthew ↗