Available for new work

The Mobile Fullstack Engineer.

FRANK!, whose name is Opia Frank, is a Fullstack Software Engineer with a passion for mobile and the technologies you need for production: Mobile development with Flutter and Dart; Web development with React, Next.js, and TypeScript; Backend systems in Rust (Actix-Web), Java (Spring Boot), and Swift (Vapor); Web3 development with Solana, Ethereum, and Solidity. 4 apps live on the App Store & Google Play.

See my work Resume ↗

github/frankolien·linkedin/frank-olien·x/frank_olien123

01 / about

A little about me

I'm Frank — an Applied Mathematics graduate from the University of Lagos who fell in love with shipping software. My focus is mobile, but I'm equally at home on the web and writing systems-level backends.

I've worked across AI-driven apps, fintech, Web3 / blockchain, and healthcare platforms — from real-time chat over WebSockets to Solana on-chain programs and Spring Boot wallet backends.

Currently a Mobile Engineer at FriendnPal (Africa's first AI mental health app), Feedr, and Meno Bible App, plus Web3 + AI research at EntryPoint Labs.

Apps live on stores

Languages I ship in

Production backends

∞

Cups of coffee

02 / skills

Tech I work with

Languages

Dart
Rust
Java
TypeScript
JavaScript
Swift
Solidity
C++

Frontend

Flutter
React
Next.js
Tailwind CSS

Backend

Actix-Web (Rust)
Spring Boot (Java)
Vapor (Swift)
REST
WebSockets

Blockchain

Ethereum
BSC
Solana
Base
Web3j

Databases

PostgreSQL
MySQL
MongoDB
Firebase
Appwrite
Supabase

Cloud & Observability

AWS
Grafana / Loki
Prometheus
Datadog
Sentry
AppSignal

Integrations

Paystack
Twilio
OpenAI
Riverpod

Flutter

Dart

Rust

Solana

Ethereum

React

TypeScript

Next.js

Tailwind CSS

Flutter

Dart

Rust

Solana

Ethereum

React

TypeScript

Next.js

Tailwind CSS

Spring

Swift

OpenAI

PostgreSQL

MongoDB

Firebase

Supabase

Solidity

Vercel

Spring

Swift

OpenAI

PostgreSQL

MongoDB

Firebase

Supabase

Solidity

Vercel

03 / experience

Where I've shipped

Present

Mobile & Web3 Researcher

@ EntryPoint Labs

Web3 and AI research company.

▹Conducting research across Web3 protocols, blockchain ecosystems, and AI-driven applications.
▹Contributing to mobile and decentralized application development initiatives.

Web3AIResearch

Apr 2025 — Present

Mobile Engineer

@ FriendnPal

Africa's first AI mental health app — a safe space where healing begins without judgement, pressure, or stigma.

▹Built real-time chat UI using WebSocket.IO with Flutter (Dart).
▹Integrated AI-powered conversational responses for mental health support.
▹Optimized app performance for improved UX across devices.
▹Published live on App Store and Google Play.

FlutterWebSocketsAIHealthcare

Contract

Mobile Engineer

@ Feedr (Relay)

AI prompt engineering tool — transforms messy thoughts into clean, structured prompts for GPT, Midjourney, Cursor, and more.

▹Building the mobile application from the ground up with Flutter.
▹Designing intuitive UX for AI prompt structuring workflows.

FlutterAIProduct

Contract

Mobile Engineer

@ Méno Bible App

AI-powered Bible app with personalized study plans, smart insights, and a global faith community.

▹Integrated OpenAI API with Riverpod state management for AI-powered Bible study features.
▹Built audio playback feature and conversational AI interface.
▹Implemented live session feature for real-time community interaction.
▹Published live on App Store and Google Play.

FlutterOpenAIRiverpodRealtime

04 / projects

Things I've built

A mix of personal projects, client work, and on-chain experiments.

Solflare Clone

↗

A Solana wallet application modeled after Solflare. Integrates Solana RPC for wallet management, token operations, and transaction signing.

FlutterDartSolana

Qent — Car Rental P2P Platform

↗

A peer-to-peer car rental marketplace with cross-platform support. REST API backend in Rust + Actix-Web, web client in React, mobile in Flutter.

RustActix-WebReactFlutter

Coffee App

↗

Companion mobile app with Flutter and a Vapor (Swift) backend service.

FlutterSwiftVapor

Nutrifi — Solana On-chain Program

↗

Wrote and deployed a Solana on-chain program (smart contract) in Rust.

RustSolanaAnchor

Springten — Web3 Crypto Wallet

↗

Spring Boot 3.x backend with JWT auth, multi-blockchain wallet support, and transaction history. Companion Flutter app with Firebase.

Java 17Spring BootWeb3jFlutterFirebase

Invoice Platform

↗

Multi-tenant invoicing API in Rust + Actix-Web. Stripe payments, recurring invoices, signed outbound webhooks, background workers (apalis), circuit breakers, rate limiting, and Prometheus metrics.

RustActix-WebPostgresRedisStripe