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Sheriffdeen Olona

@sheriffdeenolona

Mobile Software Engineer specializing in Flutter fintech apps, building secure, scalable banking and payment experiences.

Nigeria

Message

What I'm looking for

I’m looking to build secure, scalable mobile fintech products—owning transaction flows, authentication, and smooth UX—while collaborating closely with backend teams and leading delivery to ship reliable apps that solve real customer needs.

I’m a Mobile Software Engineer focused on building production-ready fintech, banking, and secure payment applications. I bring 4+ years of experience delivering scalable, high-performance mobile apps using Flutter, Dart, and REST APIs, with deep ownership of transaction flows, authentication, and user experience.

Across roles at OpenFactor Group, UniSwitch Technology Limited, AttainBase, and Intelytics, I’ve implemented secure authentication (PIN/biometric), automated beneficiary and core banking operations, and shipped user-centric UI for payments, scheduling, and summaries. I also lead mobile teams and drive API integrations, improving efficiency, response times, and overall app reliability.

Experience

Work history, roles, and key accomplishments

Mobile Software Engineer

Openfactor Group

Jan 2024 - Jan 2025 (1 year)

Built and maintained iOS banking features for Wema Bank’s ALAT app, including airtime/data purchases, scheduled payments, and beneficiary management. Designed a modular service layer and implemented scheduled payments and beneficiary automation to improve scalability and user experience.

Swift UIKit Mobile Banking Airtime And Data Purchases Payment Schedules Banking Beneficiaries Management REST APIs Service Layers Authentication UI Components

Mobile Software Engineer

Uniswitch Technology Limited

Jan 2024 - Jan 2025 (1 year)

Developed and maintained a Flutter-based mobile banking application for digital financial services such as fund transfers, bill payments, and savings management. Implemented secure authentication and transaction flows and automated core banking operations like search, validation, and error handling.

Flutter Dart Mobile Banking Authentication UI Components Real Time Account Balance Session Management Error Handling

Mobile Software Engineer

Attainbase

Jan 2023 - Jan 2024 (1 year)

Developed and optimized UI components for a cross-platform ERP system using Flutter across Android, iOS, web, and desktop. Led API integrations across ERP modules and collaborated with backend engineers to resolve API bottlenecks, improving response times and system stability.

Flutter Dart Cross Platform Development ERP API Integration Performance Optimization UI Components Team Leadership

Mobile Software Engineer

Intelytics Limited

Jan 2022 - Jan 2023 (1 year)

Developed a Flutter-based cross-platform mobile application supporting communication and engagement for a large community. Integrated real-time in-app chat and built and maintained an in-app store to support transactions.

Flutter Dart Cross Platform Mobile Development In App Messaging app store User Engagement Firebase

Mobile Software Engineer

Softprism

Jan 2021 - Jan 2022 (1 year)

Led and supervised a team of 6 mobile developers to ensure effective collaboration and timely delivery. Oversaw the development of four iOS and Android mobile applications across the full development lifecycle from planning to deployment.

Mobile Development iOS Development Team Leadership Project Delivery Deployment