Summary
Overview
Work History
Education
Skills
Timeline
SeniorSoftwareEngineer

Johnson Chinonso

Senior Software Engineer
Lagos,Lagos

Summary

Dynamic Senior Frontend Software Developer with over 12 years of experience in crafting innovative and scalable software solutions, significantly enhancing user experiences and team productivity. Proficient in modern technologies such as React, JavaScript, and TypeScript, with a strong focus on responsive design and efficient code practices. Demonstrated ability to lead engineering teams and collaborate effectively in remote settings, driving substantial improvements in system performance and user satisfaction. Committed to leveraging technical expertise to deliver high-quality, production-ready applications that meet evolving business needs.

Overview

11
11
years of professional experience

Work History

Senior Frontend Software Developer

Momentum Group
Birkirkara
04.2023 - 05.2025
  • Built initial structure for SPINBET product, establishing developer style guides and enabling scalable growth.
  • Drove development of key features, including Tournament platform, Christmas Campaign, Bet-ticker and Black Diamond Leader-board, focusing on performance and user engagement.
  • Developed modular UI components in React, enhancing development efficiency by 35% and reducing integration times by 20%.
  • Enhanced user experience through responsive design, improving mobile session durations by 30% and desktop conversions by 15%.
  • Collaborated with UX designers and back-end developers, reducing user complaints by 30% and increasing daily active users by 22%.

Senior Frontend Software Developer (Contract-Remote)

Modus Create
05.2021 - 04.2023
  • Engineered key modules for SCIENCE-LOGIC SaaS platform, enhancing system reliability by 25% and reducing downtime by 40%.
  • Led the design strategy for the Device Groups feature, incorporating reusable components - resulting in a 45% reduction in production time and a 22% increase in user satisfaction.
  • Optimized SLDATA-Grid performance by implementing efficient data retrieval techniques, reducing loading times by 55% and boosting user satisfaction by 38%.
  • Collaborated with cross-functional teams to gather requirements and align project goals, ensuring timely and effective feature delivery.
  • Implemented best practices for code quality and performance, fostering a culture of continuous improvement within the development team.

Senior Frontend Software Developer (Contract-Remote)

Studio 14
Birmingham
05.2020 - 05.2021
  • Led and mentored 7 engineers, enhancing technical skills and boosting team productivity.
  • Established pull request guidelines and best practices, achieving 40% reduction in post-deployment issues.
  • Developed and optimized cross-platform mobile applications, increasing user retention by 35%.
  • Implemented performance testing and code reviews, ensuring high-quality software delivery.
  • Collaborated with cross-functional teams to align engineering efforts with business goals.

Senior Full-stack Application Developer (Contract-Remote)

WesData
Stamford
05.2019 - 05.2020
  • Spearheaded development of core Category Mapper feature, enabling efficient classification of merchant product data.
  • Revamped web clients with React and Gatsbyjs, achieving 40% improvement in page load speed.
  • Engineered scalable backend APIs using Nodejs and AWS Lambda, enhancing system reliability by managing over 1 million requests per hour.
  • Automated merchant product feed integrations for Google, Amazon, and Shopify, reducing manual input by 55%.
  • Led cross-functional collaboration to optimize product features, significantly improving user engagement.

Senior Frontend Software Developer (Contract - Remote)

JungleCoders
10.2018 - 03.2019
  • Revamped user interface in collaboration with UX and visual designers, achieving 50% increase in customer retention and 20% boost in user satisfaction.
  • Led evolution of Sechub product, expanding functionality by 40% and driving 50% increase in user adoption.
  • Developed high-performance, cross-platform mobile applications using React and React Native, enhancing compatibility by 30%.
  • Implemented automated testing strategies to ensure code quality and reduce deployment errors.
  • Mentored junior developers, fostering skill development and promoting best practices in coding.

Senior Full-stack Software Developer (Contract - Remote)

Cinemaloop Inc.
05.2018 - 02.2019
  • Designed and developed applications using test-driven development (TDD), enhancing code quality and reliability.
  • Maintained software performance and stability through automation and comprehensive unit testing.
  • Collaborated with cross-functional teams, delivering technical solutions that increased productivity.
  • Led code development efforts, implementing code reuse strategies for faster project delivery.
  • Integrated agile methodologies to streamline project workflows and improve delivery timelines.

Software Developer

Andela
06.2017 - 01.2018
  • Contributed to the internal product VOA (Voice of Andela), supporting initiatives that improved employee engagement and internal product adoption.
  • Developed robust RESTful APIs to support a JavaScript front-end, efficiently handling over 500,000 concurrent users and achieving 100% unit test coverage for maximum reliability.
  • Implemented performance-optimized algorithms, significantly reducing web application load times and enhancing user experience.
  • Collaborated with technical product managers on feature planning and blueprint design, playing a key role in shaping strategic annual product roadmaps.

Frontend Software Developer

Imaxinacion
08.2016 - 09.2017
  • Contributed to the growth of the Open Heaven product, significantly increasing monthly active users and enhancing user engagement.
  • Executed key design changes in collaboration with UX and visual designers, resulting in a 28% surge in app ratings and a 42% increase in user satisfaction within three months.
  • Integrated back-end APIs with mobile applications, reducing API-related bugs and improving technical issue resolution - cutting down customer complaint response times significantly.

Software Developer

Lymnet
02.2014 - 02.2016
  • Boosted website traffic through targeted SEO strategies and regular content updates, enhancing user engagement and site visibility.
  • Analyzed user requirements and delivered design support, improving web application usability and customer satisfaction.
  • Migrated front-end framework from jQuery to Angular 1, optimizing load times and application performance.
  • Coordinated cross-functional collaboration to align development with business goals, ensuring timely delivery of projects.
  • Implemented testing frameworks to enhance code quality and reliability, leading to a decrease in production bugs.

Education

BSc - Mathematics

University of Nigeria
Enugu-Ukwu, AN

Skills

Timeline

Senior Frontend Software Developer

Momentum Group
04.2023 - 05.2025

Senior Frontend Software Developer (Contract-Remote)

Modus Create
05.2021 - 04.2023

Senior Frontend Software Developer (Contract-Remote)

Studio 14
05.2020 - 05.2021

Senior Full-stack Application Developer (Contract-Remote)

WesData
05.2019 - 05.2020

Senior Frontend Software Developer (Contract - Remote)

JungleCoders
10.2018 - 03.2019

Senior Full-stack Software Developer (Contract - Remote)

Cinemaloop Inc.
05.2018 - 02.2019

Software Developer

Andela
06.2017 - 01.2018

Frontend Software Developer

Imaxinacion
08.2016 - 09.2017

Software Developer

Lymnet
02.2014 - 02.2016

BSc - Mathematics

University of Nigeria

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Johnson ChinonsoSenior Software Engineer