Open to opportunities

Oluwasegun Olateju

@oluwasegunolateju

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Full-stack web and mobile developer building secure apps with clean APIs and modern frontends.

Nigeria

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What I'm looking for

I’m looking to build and upgrade full-stack web and mobile apps, own API-driven features, and collaborate with teams that value clean code, fast delivery, and reliability across frontend and backend.

I’m a FullStack Web & Mobile App Developer based in Lagos, Nigeria, focused on shipping end-to-end products—from UI to backend APIs and app updates. I enjoy turning client needs into working features quickly, then improving them with clean, maintainable code.

In my freelance and full-time work, I’ve built and upgraded mobile apps for real use cases. One example is a mobile app for keeping and retrieving items in a lab—where I integrated a backend API for login and storage, added a search module, and connected to an Arduino bluetooth device to display position.

On the web side, I design and develop client websites and web apps, then implement both frontend and backend functionality. I’ve worked with React, NextJS, VueJS, NuxtJs, and Laravel to replicate modules from web to mobile, fix bugs, and extend features, including API development and websocket integration.

What motivates me is building products that are reliable, user-friendly, and easy to evolve. I bring practical experience across mobile and web stacks—so teams can move faster from design to production and keep apps stable as requirements grow.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Mobile Developer

Current

Cavidel Limited

Aug 2024 - Present (1 year 8 months)

Upgraded company mobile apps to the latest Android version, built apps for clients, and fixed bugs. Updated and developed backend APIs, and replicated web modules for mobile.

Android App Development API Integration Web To Mobile Module Porting

Current

Website Designer

Current

Power

Jan 2019 - Present (7 years 3 months)

Designed a company website to showcase services and products. Added photo and video galleries to present product content.

Website Design Gallery Implementation Frontend Development

Web Developer

GuruSystems Technology

Mar 2023 - Jun 2024 (1 year 3 months)

Designed websites and web applications for clients, and resolved bugs and added new features. Built front-end and back-end components using React/NextJS/Vue/Nuxt and Laravel, including API development.

React React NextJS Vue Nuxt Laravel Frontend Development API Development

Web Developer

Nicargo Tech

Apr 2022 - Feb 2023 (10 months)

Designed websites and web apps for clients, fixed bugs, and added new features. Developed APIs and implemented front-end and back-end functionality using NextJS/NuxtJS and Laravel.

Laravel Frontend Development Web Application Development App Feature Implementation

Flutter Mobile Developer

CoinGlobe

Feb 2022 - Mar 2022 (1 month)

Designed the UI and developed the mobile app using Flutter. Connected the mobile app to the web app API.

Flutter Dart UI Design Mobile App Development

Vue Laravel Web Developer

CoinGlobe

Dec 2021 - Jan 2022 (1 month)

Designed and built the website frontend using VueJS, TailwindCSS, and InertiaJS. Developed the Laravel backend, integrated websockets, and created APIs for third parties and the mobile app.

TailwindCSS Laravel WebSockets Backend Development API Development Frontend Development

Business Website Developer

MilSolution

Aug 2019 - Sep 2019 (1 month)

Designed a business website and implemented contact and quote forms. Added homepage animations to enhance the user experience.

Web Design Quote Form Integration Frontend Development UI Animation

Mobile App Developer

Sampl App

Dec 2025 - Present (4 months)

Built a lab mobile app to keep and retrieve items, including Bluetooth connection to an Arduino device for displaying position. Integrated backend APIs for login and item storage/retrieval and implemented an in-app search module; uploaded the app to the app store.

Android App Development Arduino Bluetooth Integration App Store Publishing