JKJoy Kirii
@joykirii
Frontend developer specializing in responsive web and game UIs using React, Next.js, Phaser.js.
United KingdomWhat I'm looking for
I am a frontend developer with 2+ years' experience building responsive web and browser-based game interfaces, complemented by QA and AI model training work. I focus on creating engaging user experiences using Next.js, React, Angular, TypeScript and Phaser.js.
At Usiku Games I built and maintained the frontend for a rhythm game, implemented gameplay levels and a custom audio visualizer, and accelerated UI delivery to shorten release cycles. My work received positive player feedback for improved engagement.
As a freelance AI coding trainer I refined prompts, evaluated model responses, and simulated developer workflows for generative models working with JavaScript, TypeScript, React and Next.js, consistently earning a 4.5/5 quality rating. Previously I served as Electronic Arts’ first Swahili localization tester, producing detailed bug reports and test coverage.
I hold an MSc in Software Development and have a background in full-stack training and collaborative frontend projects. I bring strong problem-solving, attention to detail, and cross-functional communication skills to deliver reliable, user-focused products.
Experience
Work history, roles, and key accomplishments
Frontend Developer
Usiku Games
Jun 2024 - Present (1 year 4 months)
Built and maintained the frontend of a browser-based rhythm game using Next.js and Phaser.js, accelerating feature delivery and improving gameplay engagement through custom levels and an audio visualizer.
OUTrained generative AI coding models by creating/refining prompts and evaluating responses for JavaScript/TypeScript and React workflows.
EAServed as EA's first Swahili localization tester, validating text and audio, and delivered detailed bug reports and functional test coverage that supported the launch of Tales of Kenzera: Zau.
Frontend Developer
FundizShop
May 2021 - Jun 2022 (1 year 1 month)
Led a complete UI revamp of an e-commerce platform in Angular, ensuring responsive cross-device compatibility and validating API integrations to meet design and usability requirements on time.
Education
Degrees, certifications, and relevant coursework
QBQueen's University Belfast
Master of Science, Software Development
2022 - 2023
Completed an MSc in Software Development with focus on advanced software engineering concepts and practical development skills.
MSMoringa School
Diploma, Full Stack Web Development
2021 - 2021
Completed a Diploma in Full Stack Web Development covering frontend and backend technologies and practical project work.
TKTechnical University of Kenya
Bachelor of Music, Music
2016 - 2020
Bachelor degree in Music with study of performance, theory, and technology-related aspects of music.
Availability
Location
United KingdomAuthorized to work in
Job categories
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