Oluwafemi Sosanya
Wattle road, B70 9BL • hefehmzy@gmail.com
LinkedIn • Portfolio
SUMMARY
Frontend Engineer with expertise in building performant, accessible web applications using React, Next.js, Vue.js, and TypeScript. Proven track record of improving user engagement (+25%) and revenue (+15%) through strategic feature implementation. Experienced in collaborative cross-disciplinary environments, designing reusable component libraries, and optimizing web applications for performance and accessibility. Passionate about iterative development approaches and knowledge sharing, with a demonstrated ability to lead and mentor engineering teams.
PROFESSIONAL EXPERIENCE
Twinkl Feb 2024 – Present
Senior Software Engineer
- Built and launched a high-performing Maths App within 7 months that quickly surpassed other products in user adoption and engagement
- Created the company's most interactive web application, achieving market dominance within just three months of launch
- Engineered an optimized, efficient frontend architecture ensuring exceptional speed and user experience
- Contributed to the development of a custom in-house analytics tracking solution now used company-wide
- Leading company-wide design system implementation to improve consistency and development efficiency
- Spearheading migration from monolithic architecture to modern cloud-based solutions on AWS
The Tonic Technologies Nov 2022 – Jan 2024
Senior Frontend Engineer
- Led frontend development of Breet (breet.io), Cardtonic (cardtonic.com) crypto & giftcard products, solving payment issues across Africa
- Architected and implemented GitHub integration workflow enabling incremental feature/patch deployments to production
- Developed reusable, themeable component library while achieving 96% Lighthouse score with perfect accessibility and SEO ratings
- Implemented key revenue-driving features, resulting in a 15% revenue increase and a 20% reduction in fraudulent activity
- Established development phase protocols and CI/CD pipelines to improve team efficiency and code quality
- Collaborated with cross-functional teams to design and deploy complex features within iterative dev cycles
My Event Pod Nov 2021 – Dec 2022
Frontend Engineer
- 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.
Mkobobank Apr 2022 – Oct 2022
Frontend Engineer (Contract)
- 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.
Charisol LTD Oct 2020 – Nov 2021
Frontend Engineer
- 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 to the products handled by Charisol
Digital Flames Tech Apr 2018 – Jul 2020
Web Developer
- Crafted browser-compatible websites and web apps 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.
- Adopted MERN stack and other modern technologies to develop responsive web apps.
- 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 optimisations for client websites, resulting in measurable increases in conversion rates and user engagement.
EDUCATION
Tai Solarin University of Education, Ijagun, Ogun Nov 2015
SKILLS
Languages: HTML, CSS, JavaScript, Typescript, PHP
Libraries: React, jQuery, Redux, Redux-Toolkit, Zustand, etc.
Frameworks: Nextjs, React Native, Express.js, Vue.js, Angular, StencilJS
Testing: Jest, Vitest, Cypress, Postman
CI/CD: Git, Git Actions, Azure pipelines, Vercel, Netlify, Heroku
Database: MongoDB, Postgres, MySQL, Firebase
Others: REST, GraphQL, RTK-Query, Axios, React-Query, Framer-motion, D3.JS, Node JS, EJS. HBS, GitHub, GitLab, Docker, Microsoft Azure, Notion, Slack, Jira, Basecamp, Click up, Adobe XD, Figma, Premier Pro, Adobe Audition, SCSS, LESS, Bootstrap, Styled Components, Shadcn, Material UI, Tailwind CSS, Chakra UI, Ant Design, Yup, Zod WordPress
CONTACT & SOCIALS
GitHub: https://github.com/boomshakar
Skype: https://join.skype.com/invite/DrdxeIBRhW1i
Mobile: +447867474225