Hi, I'm Yosaphat Harwindra Jayacitna Prasetya, a frontend software engineer based in Surakarta, Indonesia. I specialize in building production-grade React applications for enterprise environments, with a focus on real-time and visualization-heavy UIs, performance, maintainability, and reliability within Agile/Scrum teams.\n\nI enjoy collaborating with cross-functional teams to translate complex requirements into scalable UI solutions, integrate third-party APIs, and optimize rendering. I'm comfortable with modern tooling, TDD, and writing clean, reusable components to deliver robust, user-friendly interfaces across platforms.

Yosaphat Harwindra Jayacitna Prasetya

Hi, I'm Yosaphat Harwindra Jayacitna Prasetya, a frontend software engineer based in Surakarta, Indonesia. I specialize in building production-grade React applications for enterprise environments, with a focus on real-time and visualization-heavy UIs, performance, maintainability, and reliability within Agile/Scrum teams.\n\nI enjoy collaborating with cross-functional teams to translate complex requirements into scalable UI solutions, integrate third-party APIs, and optimize rendering. I'm comfortable with modern tooling, TDD, and writing clean, reusable components to deliver robust, user-friendly interfaces across platforms.

Available to hire

Hi, I’m Yosaphat Harwindra Jayacitna Prasetya, a frontend software engineer based in Surakarta, Indonesia. I specialize in building production-grade React applications for enterprise environments, with a focus on real-time and visualization-heavy UIs, performance, maintainability, and reliability within Agile/Scrum teams.\n\nI enjoy collaborating with cross-functional teams to translate complex requirements into scalable UI solutions, integrate third-party APIs, and optimize rendering. I’m comfortable with modern tooling, TDD, and writing clean, reusable components to deliver robust, user-friendly interfaces across platforms.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
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Language

Indonesian
Fluent
English
Advanced

Work Experience

Frontend Software Engineer at Formulatrix
July 1, 2024 - Present
Maintained the Rover frontend UI, a real-time visualization system supporting laboratory automation workflows in production. Developed and optimized a React application built with Vite, enhanced Three.js for interactive robotic fleet visualization, and integrated SignalR for real-time data streaming. Delivered hotfixes, investigated UI bugs under stabilization conditions, and improved rendering performance, state consistency, and maintainability. Wrote unit tests using Jest and participated in Agile/Scrum ceremonies; documented feature architecture and collaborated with UX designers to ensure alignment with business objectives.
Frontend Engineer at Formulatrix
December 1, 2024 - May 1, 2025
Project: Fmlx Common UI. Contributed to developing scalable, reusable UI components, including pagination and collapsible tables; modularized core components for maintainability and cross-project integration. Enhanced data visualization with loaders/backdrop components; authored unit tests to ensure component robustness; documented development from item start to MVP; collaborated with cross-functional teams to align UI with business objectives.
Frontend Engineer Intern at Formulatrix
July 1, 2024 - November 1, 2024
Project: Internal Web Application (ESS). Built user-friendly, responsive interfaces with React; enhanced reusable components and data handling; integrated News API and JWT authentication; developed RBAC and session management; implemented robust error handling for user interactions.
Fullstack Software Engineer at Revou (Revou U)
October 1, 2023 - April 1, 2024
Monitored application performance, debugged issues, and optimized performance for improved user experience. Developed and deployed full-stack applications using JavaScript, React, and PostgreSQL; collaborated with cross-functional teams to design software solutions meeting project objectives; utilized Git for version control; integrated third-party APIs to extend functionality and user experience.
Fullstack Engineer at Revou Faculty Project
September 1, 2021 - November 1, 2021
Final Project: Tech for Village website. Developed user-friendly, responsive web interfaces using React; ensured cross-device accessibility; integrated News API and JWT authentication; implemented error handling and form validation using React Hook Form and Zod.

Education

Fullstack Software Engineer Program at RevoU
September 1, 2023 - April 1, 2024
High School Diploma - Mechanical Engineering at SMK St. Mikael Surakarta
May 1, 2016 - May 1, 2019

Qualifications

Cloud Practitioner Essentials (Belajar Dasar AWS Cloud)
December 17, 2023 - March 17, 2026
JavaScript Essentials 1
December 10, 2023 - March 17, 2026
Seluk Beluk Jaringan Komputer
September 28, 2023 - March 17, 2026
Python Essentials 1
May 27, 2024 - March 17, 2026
MikroTik Certified Network Associate
May 17, 2024 - March 17, 2026

Industry Experience

Software & Internet, Professional Services