Open to opportunities

Johnson Chinonso

@johnsonchinonso

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Senior Frontend Software Developer delivering scalable React and TypeScript solutions.

Nigeria

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What I'm looking for

I seek senior frontend roles focused on React/TypeScript with collaborative teams, opportunities to lead, mentor, and optimize user-facing performance.

I am a senior frontend software developer specializing in React, TypeScript, Next.js, and performant, responsive user experiences. I have led frontend architecture and teams, built reusable component libraries and style guides, and driven measurable improvements in performance, engagement, and conversion across web and mobile products.

Throughout my career I’ve delivered features for enterprise and consumer platforms, mentored engineers, and collaborated closely with UX and backend teams to integrate APIs and improve reliability. My work has reduced load times, increased retention and conversions, and enabled scalable team growth.

Experience

Work history, roles, and key accomplishments

Senior Frontend Developer

Momentum Group

Apr 2023 - May 2025 (2 years 1 month)

Architected frontend foundation and led development of the SpinBet online casino platform, delivering features that increased engagement and supported team growth to seven engineers; improved development efficiency and mobile session duration through reusable components and Next.js optimizations.

React Next.js TypeScript Responsive Design Performance Optimization SEO Accessibility

Senior Frontend Software Developer

Modus Create

May 2021 - Apr 2023 (1 year 11 months)

Engineered core modules for the ScienceLogic SaaS platform using React, TypeScript, and GraphQL, reducing load times and production time while driving cross-team consistency via code quality and performance guides.

React TypeScript GraphQL Performance Optimization Cross Functional Collaboration Onboarding

Senior Frontend Developer

Studio 14

May 2020 - May 2021 (1 year)

Led a team of seven on Africlick mobile app using React Native and TypeScript, establishing engineering standards and reducing post-deployment issues while increasing user retention through cross-platform optimizations.

React Native React TypeScript Cross Platform Development Performance Testing CI CD

Senior Full-stack Developer

WesData

May 2019 - May 2020 (1 year)

Oversaw full-stack development including APIs and web clients, improving page load speed and enabling scalable backend APIs to handle 1M+ requests per hour while automating product data classification to reduce manual work.

React API Design Performance Optimization Data Integration Scalability Backend Development

Senior Frontend Developer

Jungle Coders

Oct 2018 - Mar 2019 (5 months)

Sole frontend developer for Sechub, building the interface from scratch and collaborating with designers to expand functionality and increase user adoption and retention through UI revamp and cross-platform improvements.

React React Native Frontend Architecture UX collaboration Automated Testing Performance

Senior Full-stack Developer

Cinemaloop Inc.

May 2018 - Feb 2019 (9 months)

Implemented test-driven full-stack applications with Node.js and React, increasing code quality and delivery speed through component reuse and Agile practices.

Node Sails.JS React TDD Agile Test Coverage CI CD

Software Developer

Andela

Jun 2017 - Jan 2018 (7 months)

Developed RESTful APIs with Node.js and Express supporting high concurrency for internal collaboration tools and delivered 100% unit test coverage to ensure reliability under heavy load.

Node REST APIs Testing Scalability Javascript (ES6)Performance Backend

Frontend Software Developer

Imaxinacion

Aug 2016 - Sep 2017 (1 year 1 month)

Drove growth of Open Heaven products using React and React Native, improving app ratings and user satisfaction via UI changes and backend API integrations.

React React Native API Integration UX collaboration Performance Optimization Mobile Development

Education

Degrees, certifications, and relevant coursework

University of Nigeria

Bachelor of Science, Mathematics

Completed a Bachelor of Science in Mathematics at the University of Nigeria, focusing on mathematical foundations applicable to software development and problem solving.