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Sinaayo PopoolaSP
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Sinaayo Popoola

@sinaayopopoola

Full-Stack, Backend & Mobile Software Engineer with 3+ years of experience building scalable, production-ready applications across fintech, enterprise

Nigeria
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I’m a Full-Stack, Backend, and Mobile Software Engineer with over 5 years of professional experience building and maintaining production software across fintech, enterprise systems, telecom, marketplaces, and startups. My experience spans backend engineering, full-stack development, mobile applications, cloud infrastructure, API design, system architecture, and performance optimization.

I started my career working across full-stack and backend roles, building web and mobile applications with React, React Native, Node.js, Django, and related technologies. Over time, I have worked on increasingly complex systems, including enterprise ERP platforms, workflow and operations platforms, ride-booking systems, social commerce products, translation marketplaces, and fintech infrastructure.

A significant part of my experience has involved building backend services and APIs. I have worked extensively with Django/DRF, Node.js, Express, and NestJS, designing REST APIs, authentication and authorization systems, payment workflows, transaction processing, notifications, background tasks, and integrations with external services. I also have experience working with PostgreSQL, MongoDB, Redis, and performance-focused database optimization.

I have also worked on enterprise-scale projects for UK clients, including Virgin Media and HSBC. At Virgin Media, I contributed to an event-driven microservices system using Azure Event Hubs that processed thousands of events per second. For HSBC, I worked on secure internal applications using React, TypeScript, Node.js, and PostgreSQL, while working within strict security and compliance requirements.

In other roles, I have led development of enterprise employee-management software, built cross-platform React Native applications, developed fintech billing and payment infrastructure, and worked on real-time platforms involving messaging, matching, location tracking, and payment integrations. I have also delivered measurable performance improvements, including reducing frontend load times by 45% and optimizing backend processing by 60% in different projects.
My strongest technical interests are backend engineering, distributed and event-driven systems, system design, cloud technologies, API architecture, database performance, and building reliable systems that can scale with business growth. I also enjoy full-stack and mobile development because it gives me the opportunity to understand products from both the engineering and user-experience perspectives.

I’m particularly interested in joining teams where I can work on meaningful technical challenges, contribute to architecture and engineering decisions, and build products that solve real business problems. I’m open to remote and international opportunities, particularly with companies looking for engineers who can work across backend, full-stack, cloud, and mobile environments.

Experience

Work history, roles, and key accomplishments

GT

Full Stack Engineer

Gyzer Technologies

Oct 2023 - Apr 2026 (2 years 6 months)

Lead developer for an enterprise employee management system using React, Next.js, and TypeScript. Built and maintained the cross-platform mobile version using React Native, improving frontend performance by 45%.

BL

Full Stack & Mobile Engineer

Babble-Translate Ltd

Jul 2024 - Dec 2024 (5 months)

Building translator and user applications using React Native for mobile and React/Next.js for web. Developing backend features using Node.js & Express, including translation job management, matching algorithms, messaging, and user workflows.

HS

Full Stack Developer

Jan 2024 - May 2024 (4 months)

Built secure full-stack features using React, TypeScript, Node.js, and PostgreSQL for enterprise dashboards. Ensured backend services aligned with strict bank-grade security policies and compliance standards.

BT

Full Stack & Mobile Developer

Banao Technologies

Jan 2023 - Sep 2023 (8 months)

Designed and developed full-stack web and mobile applications using React, React Native, and Node.js. Delivered solutions for educational, business, and organizational clients.

AS

Full Stack Developer

Asentir Solutions

Sep 2022 - Feb 2023 (5 months)

Built an enterprise ERP platform using Django REST Framework and React. Integrated finance, HR, operations, and analytics modules, and connected with external tools including ZohoBooks, TallyPrime, and Microsoft Dynamics 365.

Education

Degrees, certifications, and relevant coursework

Lagos State University logoLU

Lagos State University

Electronics and Computer Engineering

2019 - 2025

Studied electronics and computer engineering at Lagos State University from 2019 to 2025.

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