United Kingdom

Front-end

Back-end

Full stack

Oluwafemi Sosanya

Senior React Developer

Blog

Communication

Collaboration

Problem-solving

Time management

Critical-thinking

Team player

Organisation skills

Leadership

Analytical skills

Game programming

Unit Testing

Postman

React

React Native

Adobe XD

Axure

Canva

D3.js

Docker

Figma

GitHub

HTML

HubSpot

JavaScript

Mailchimp

Notion

GitLab

Google Analytics

Jenkins

SEMrush

REST API

MongoDB

Node.js

- Led a team of 3 junior engineers in a global optimization initiative, increasing performance by 20% and reducing server costs by 15%. Defining clear milestones and deliverables to ensure smooth execution.
- Owned the development and launch of the referral system, driving a 12% increase in user acquisition within 6 months. Defined the feature roadmap, architected the solution, and mentored junior engineers on implementation.
- Built a secure authentication system leveraging Next.js and server-side authorization, mitigating potential security vulnerabilities and improving user trust.
- Elevated product SEO by conducting comprehensive keyword research and implementing strategic on-page optimizations, leading to a 30% increase in organic traffic.
- Guided and enabled a group of less experienced front-end developers, cultivating an environment of education and development.

- Spearheaded the development of a futuristic rebranding UI for their upcoming PWA, showcasing experience with building modern and engaging interfaces using Nextjs, Typescript, Vercel, Redux toolkit, etc.
- Developed reusable and themeable custom UI component library for the product’s new version.
- Achieved 96% Lighthouse result and perfect scores for accessibility, best practices, and SEO by optimizing page speed, demonstrating expertise in performance optimization.
- Oversaw the implementation of key revenue-driving features like "Buy Gift Card" and "Virtual Dollar Cards," contributing to a 15% increase in overall revenue.
- Implemented automated security measures like Withdrawal 2FA, reducing fraudulent activity by 20%.
- Successfully deployed the upgraded PWA with refreshed UI and new features like Bill payment feature, leaderboard feature, Extended Reward point feature, Virtual dollar card feature, and Just Gadgets feature (E-commerce) showcasing the ability to deliver complex projects.

- Increased user engagement by 25% and decreased page load times by 30% through cross-browser compatible and accessible websites, exceeding industry standards. 
- Authored the new website leveraging SEO tactics, resulting in a 250% increase in monthly user acquisition, aligning with their interest in user base growth.
- Collaborated with design, product, and back-end teams to develop the Mkobobank Partners PWA, demonstrating teamwork and the ability to handle complex projects.

- Established the company's first engineering process blueprint, standardizing practices and improving team efficiency by 25%.
- Streamlined the update deployment process, reducing production roll-out time by 50%.
- Improved consistency and reusability across products by developing and maintaining the company's web component library and design system.
- Mentored and empowered a team of 4 junior developers, fostering a culture of ownership and continuous learning. Increased team productivity by 25% through effective delegation and skill development initiatives.
- Contributed significantly to the entire product development lifecycle for Maildrip (50,000+ users), from feature conception and design to implementation and testing. Championed agile methodologies and facilitated efficient collaboration between engineers and product teams.
- Optimized application performance through code reviews, caching strategies, and infrastructure improvements, achieving a 40% reduction in page load times and improved user experience.
- Enhanced the engineering process for maildrip and integrated with the other products handled by Charisol

- Crafted browser-compatible web pages using HTML5, CSS3, JavaScript, and WordPress.
- Worked with UX/UI design teams to improve the checkout flow, leading to a 20% increase in conversion rates.
- Animated particles on web backgrounds using HTML5 canvases to support site-wide promotions.
- Validated user input to maintain data integrity before sending it to the back end, resulting in a 99.9% accuracy rate in data entry and a 15% reduction in backend errors.

- Successfully built and maintained websites using content management systems like WordPress, appealing to their potential interest in integrations with third-party services.
- Utilized MERN stack and other modern technologies to develop responsive web apps, showcasing your technical expertise and ability to learn new technologies.
- Utilized agile methodologies and continuous integration/continuous delivery (CI/CD) practices to ensure project timelines and quality.
- Enhanced user experience and conversions through thoughtful front-end development, demonstrating alignment with their user-centric approach.
- Identified and implemented performance optimizations for client websites, resulting in measurable increases in conversion rates and user engagement.

Oluwafemi Sosanya🇬🇧