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Alohan Daniel Etiosa

@alohandanieletiosa

Full-Stack Software Engineer at Unified Payment Services Limited who led the PayAttitude Mobile App v2 rebuild and shipped secure QR payments.

Nigeria

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What I'm looking for

I’m looking to contribute to a high-growth MERN or Next.js team and continue growing into a senior or tech-lead role.

At Unified Payment Services Limited, I led the rebuild and rebranding of PayAttitude Mobile App v2, shipping QR payments, scheduled transfers, transaction history, and biometric authentication in a React Native and TypeScript app.

I integrated the app with Node.js, Express, and MongoDB services, designing APIs and secure authentication flows. Automated testing and CI/CD helped achieve 40% faster release cycles.

I also worked on the company’s payment infrastructure, including EMV-certified POS applications and live transaction APIs. My work covered ISO 8583 and EMV edge cases, secure transaction flows, and a Java geofencing SDK for location-based transaction controls.

Earlier, I contributed to Payloft’s customer-facing payment gateway pages and the Terminal Configuration Manager platform. I’m ready to contribute to a high-growth MERN or Next.js team and continue growing into a senior or tech-lead role.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer (Full-Stack Tech Lead)

Current

Unified Payment Services Limited

Dec 2024 - Present (1 year 10 months)

Led the complete rebuild and rebranding of PayAttitude Mobile App v2 as sole Tech Lead, architected and shipped a production-grade React Native (Expo) + TypeScript codebase, and owned full-stack integration with Node.js + Express + MongoDB backend. Designed a custom Geofencing SDK in Java to meet NIBSS regulatory requirements and continued as primary owner of live POS transaction APIs and backend

React Native Expo TypeScript Nativewind Stylesheets EAS NodeJS Express MongoDB Java Android Geofencing NIBSS ISO 8583 EMV Technology CI CD Jest Detox

Software Engineer (Backend Developer)

Unified Payment Services Limited

Dec 2023 - Nov 2024 (11 months)

Owned backend and embedded development for EMV-certified POS applications on various terminals using C (Linux) and Java (Android), shipping features like cash withdrawal, NFC contactless, dynamic QR payments, and custom PIN solutions. Applied expertise in ISO 8583, EMV kernels, cryptographic key exchange, and SSL/TLS pinning to design secure transaction flows.

C Java Android EMV Technology ISO 8583 Cryptography SSL TLS POS PAX NEXGO TOPWISE HorizonPay NodeJS Express EJS PostgreSQL

Software Engineer (Frontend Developer)

Unified Payment Services Limited

Nov 2022 - Nov 2023 (1 year)

Collaborated with cross-functional team to design and build the landing page, features showcase, and pricing sections for Payloft using React.js and Tailwind CSS. Optimized frontend performance, reducing page load times by 45% through code splitting and lazy loading, and contributed to interactive elements like dynamic pricing calculators.

React Tailwind CRA Code Splitting Lazy Loading Google Analytics Figma

Software Engineer (Internship | National Youth Service Corp)

Unified Payment Services Limited

Oct 2021 - Oct 2022 (1 year)

Onboarded during NYSC and rapidly contributed production-grade code to live POS terminal applications and customer-facing web platforms in a PCI-regulated fintech environment. Contributed to the corporate website from Figma designs using React.js, and worked directly on EMV-certified POS terminal fleet in C and Java (Android).