Yusuf Abdulhafeez - Fullstack Software developer and technical writer

My Services 🗂️

Frontend Development

Creating User-focused Interfaces and transforming website designs into reality, be it with legacy or Modern tech stack.

Backend Development

Building Secure and Performant Backend Systems to ensure Smooth Operations, proper Data Management, and Scalability.

Technical Writing

Crafting impactful technical content that bridges your product with developers and end-users, addressing their needs and driving business growth.

About Me

4.8/5

Average rating from 40+ satisfied clients

100%

Job success from 60+ contracts

9/10

534 of 600 CodeSignal GCA score (2023)

3%

Top 3% performer on Upwork

Welcome! I’m Yusuf Abdulhafeez, a full-stack developer and technical writer with a Bachelor’s degree from Obafemi Awolowo University. I’m also pursuing an MBA to further enhance my communication and team leadership skills.

Over the past 7 years, I’ve built tools and written extensively in technical domains such as device intelligence, browser fingerprinting, educating thousands and shaping best practices in the privacy. I’ve also architected and shipped robust authentication systems and complex payment solutions across multiple platforms, ensuring reliability, compliance, and seamless user experience at scale.

As a Top-Rated Talent on Upwork, I’ve consistently delivered, earning trust through performance. I also hold Upwork’s invite-only Skill Certification badge — a testament to my ability to solve complex software problems efficiently.

Building systems and crafting content to break down complex concepts is what I do. And with over 50x in user traffic gains and numerous projects — be it as a co-founder, a team member or an external contributor (including Adobe), I'm continuously driven to achieve more.

View CV ↗

Projects Showcase

TheyPlay | Discover and Share over 100M songs (Solo)

Discover and Share only the Best Songs of Life with everyone — friends, family, colleagues. TheyPlay is now Spotify-approved to go public, meaning you get full access to Spotify's 100M+ catalog of songs.

While I’m still working on it, I have made TheyPlay open-source, so feel free to reach out or checkout the repo directly if you'd like to contribute.

Rumi Africa | Book spaces and list yours (Co-founder)

Crafted server architectures, devised innovative business models, designed and developed payment systems, built stateless authentication systems, and developed databases.

My hands-on involvement ensures the seamless connection of Shortlet Hosts, Agents, and Guests, solidifying Rumi's technological foundation.

QeepApp | Notes taking app

QeepApp is a simple and intuitive note-taking app built with React that allows users to quickly jot down their thoughts and ideas.

Nookr App | 500k+ international dish recipes [FE]

Nookr is a recipe app that lets you search for ingredients and cooking instructions for international meals, using Jonas's Forkify API.

I particularly enjoyed styling this one with Sass - it was my first experience with the tech.

SweatMap App | Track your exercise mileage

SweatMap is a web app that helps you document your outdoor exercise sessions on the map using the geolocation API for location, or not - you decide.

I built SweatMap in my earlier running days, and it's been the best personal running journal.

Memoreels game | Build your cognitive skills

My first app, and first game. Memoreels is simple - yet challenging, and it's perfect for improving your memorization skills and cognitive abilities as a whole.

Check the Github link for instructions on how to play the game.

HAYVEN | My official website and blog

Yes, I crafted this web experience you're currently navigating. More than just a digital presence, it's a showcase of my work and an avenue for my thoughts.

GitHub Profile | GitHub Profile Setup (Bonus)

A number of people have asked me about how I setup my Custom GitHub profile design, alongside my aggregating data from third-party services.

So yes, I decided to showcase it here. Check it out on my GitHub profile 🚀.

Articles

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What They Said ✔️

Yusuf Abdulhafeez Adeleke (HAYVEN) is a top-notch developer! He exceeded my expectations with his attention to detail and timely delivery. Highly recommended! ”

Jack jones

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Working with Yusuf has been an absolute pleasure. He has a keen eye for design and an excellent understanding of backend development. Our project was a success thanks to his expertise. ”

Jane Smith

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Yusuf's technical writing skills are exceptional. He effortlessly breaks down complex topics into digestible content that resonates with our audience. Highly recommend for any writing project! ”

Michael Johnson

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I've had the pleasure of collaborating with Yusuf on several projects, and each time he has delivered outstanding results. His dedication, professionalism, and technical expertise are unmatched. ”

Emily Wilson

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Yusuf is a true gem in the tech industry. His ability to tackle complex challenges with ease and deliver exceptional results sets him apart. I would not hesitate to work with him again. ”

David Brown

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Yusuf's work speaks for itself. He consistently delivers high-quality solutions that meet and exceed expectations. I highly recommend him for any development or writing project. ”

Sarah Johnson

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It's rare to find someone as talented and dedicated as Yusuf. His contributions have been invaluable to our team, and I look forward to working with him on future projects. ”

Daniel Smith

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Yusuf Abdulhafeez Adeleke (HAYVEN) is a top-notch developer! He exceeded my expectations with his attention to detail and timely delivery. Highly recommended! ”