Hi, I'm

Justice Otuya

Senior Frontend & Mobile Developer

Building scalable, user-focused fintech applications with React, React Native & TypeScript. 6+ years turning complex problems into seamless product experiences.

View My Work Get in Touch Resume

Lisbon, Portugal Open to opportunities in Europe

Available for hire

I'm a Senior Frontend & Mobile Developer with over 6 years of experience shipping production-grade applications across fintech, edtech, and enterprise domains. Currently at Quidax — one of Africa's leading crypto exchanges — where I've helped launch new markets, build trading features, and drive user acquisition through engineering-led product work.

My background is a bit unusual: I studied Economics at Ahmadu Bello University before pivoting fully into software. That economic lens informs how I think about product — I care about the business impact of what I build, not just the technical elegance.

Beyond shipping code, I mentor engineers at Code the Dream (remote, US) and Enye, helping junior developers grow into confident professionals. I'm currently pursuing an M.Sc. in Information Management at NOVA IMS, Portugal.

6+ Years Experience

3 Startups Built

70% Issue Reduction

30% Revenue Impact

Spearheaded frontend localization and Ghana market launch, implementing MoMo integration, GHS wallet, and KYC workflows ensuring regulatory compliance
Delivered advanced trading features — Favorites, portfolio toggles, ODB charts — significantly improving trader engagement and decision-making
Optimized marketing conversion funnels via A/B tested landing pages (DDC & STC campaigns), driving measurable user acquisition and retention
Integrated multiple APIs for Tiering & Cashback systems, enabling complex feature rollouts with full backend interoperability
Championed system stability during launch — zero downtime, smooth user adoption

React TypeScript GraphQL A/B Testing PostHog KYC Workflows

Fast-tracked Orderbook V1 development in six weeks, delivering key trading workflows (pair selection, order placement/cancellation) ahead of schedule
Built auto-voucher withdrawal system, cutting user wait times and reducing operational overhead
Introduced PostHog analytics, enabling data-driven growth and user retention strategies
Integrated secure payments (Platinum & Fincra) and rolled out 2FA authentication, strengthening platform trust and security
Improved engagement with announcement banners, flexible savings withdrawals, and in-app feedback loops

React Next.js TypeScript Payment APIs 2FA Redux

Built nationwide helpdesk application for Nigeria's national examination body, reducing technical issues by 70% and improving fraud detection
Developed appointment booking system for JAMB, supporting controlled scheduling and COVID-19 safety protocols
Engineered reporting platforms for the National Identity Management Commission (NIMC), providing advanced tracking and driving 30% revenue growth
Designed and deployed an e-learning portal with interactive dashboards, enhancing accessibility for thousands of students
Implemented a real-time feedback system for government examination services, reducing resolution times and improving satisfaction

React Vue Node.js PostgreSQL HTML/CSS

Languages

JavaScript (ES6+)
TypeScript
Ruby

Frontend & Mobile

React
React Native
Next.js
Vue
HTML / CSS
Tailwind CSS
Material-UI

APIs & Integration

GraphQL
REST
Firebase
Payment Gateways
React Query

Tools & Platforms

Git / GitHub
PostHog
Google Cloud
VS Code
Jira / Trello
Netlify

Practices

Agile / Scrum
A/B Testing
TDD
UI/UX Optimization
Mentorship
Code Review

Databases

PostgreSQL
MySQL
MongoDB

A groundbreaking financial platform revolutionizing how people handle transactions — inclusive, low-cost, and downtime-free. Built from architecture to Play Store release as sole mobile developer.

Full cross-platform mobile app with React Native + TypeScript + GraphQL
Efficient data fetching and caching with React Query, reducing network latency
Responsive, intuitive UI with Tailwind CSS across device sizes
End-to-end ownership: architecture → dev → Play Store deployment

Enables customers to join a virtual queue by scanning a QR code or sending an SMS. Delivered end-to-end as sole developer despite team constraints.

Contributed to the Wiki Education Foundation's open-source dashboard — refactored class-based components to functional components and converted API calls from ORES to Liftwing for article completeness scoring.

Built large-scale government platforms at Digital Pulse — appointment scheduling for JAMB (millions of students), helpdesk systems reducing issues by 70%, and NIMC reporting dashboards driving 30% revenue growth.

Education

MSc

M.Sc. Information Management — Digital Transformation

Nova Information Management School (NOVA IMS)

Portugal · Sept 2025 – June 2027 · In Progress

PGD

Postgraduate Diploma in Computer Science

University of Ilorin

Ilorin, Nigeria · 2016 – 2017

BSc

B.Sc. Economics

Ahmadu Bello University, Zaria

Zaria, Nigeria · 2007 – 2012

Mentorship & Leadership

Mentor

Code the Dream

Remote, USA · 2024 – Present

Senior Mentor

Enye

Lagos, Nigeria · 2019 – Present

Mentor

MentorTribe

Lagos, Nigeria · 2022

Whether you're looking for a senior engineer to level up your frontend team, a technical collaborator for your next fintech product, or just want to connect — my inbox is open.

Email jotuya2@gmail.com

LinkedIn linkedin.com/in/justiceotuya

GitHub github.com/justiceotuya

Justice Otuya

Senior Frontend & Mobile Developer

The person behind the code

Where I've worked

Software Engineer II

Frontend Engineer

Frontend Engineer

Technologies I work with

Languages

Frontend & Mobile

APIs & Integration

Tools & Platforms

Practices

Databases

Things I've built

Gravy

Duro

Wiki Education Dashboard

JAMB + NIMC Platforms

Learning never stops

Education

M.Sc. Information Management — Digital Transformation

Postgraduate Diploma in Computer Science

B.Sc. Economics

Mentorship & Leadership

Mentor

Senior Mentor

Mentor

Let's work together