Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm a licensed Electronics Engineer who transitioned into full-stack software development, where I've found my true passion. Over the past few years, I've built web and mobile applications across various industries, from e-commerce platforms and student management systems to real-time apps. I work primarily with React, Next.js, Node.js, and modern databases, handling both frontend interfaces and backend architecture. I'm comfortable jumping into new frameworks and love solving complex problems with clean, scalable code. As a remote developer and stay-at-home dad, I've learned to work efficiently, communicate clearly, and deliver results in fast-paced environments. I'm driven by building products that genuinely help people and businesses succeed.…I'm a licensed Electronics Engineer who transitioned into full-stack software development, where I've found my true passion. Over the past few years, I've built web and mobile applications across various industries, from e-commerce platforms and student management systems to real-time apps. I work primarily with React, Next.js, Node.js, and modern databases, handling both frontend interfaces and backend architecture. I'm comfortable jumping into new frameworks and love solving complex problems with clean, scalable code. As a remote developer and stay-at-home dad, I've learned to work efficiently, communicate clearly, and deliver results in fast-paced environments. I'm driven by building products that genuinely help people and businesses succeed.

Karl Steven F. Requinto

Full Stack Developer, Web Developer, Front-End Developer, +1





I'm a licensed Electronics Engineer who transitioned into full-stack software development, where I've found my true passion. Over the past few years, I've built web and mobile applications across various industries, from e-commerce platforms and student management systems to real-time apps. I work primarily with React, Next.js, Node.js, and modern databases, handling both frontend interfaces and backend architecture. I'm comfortable jumping into new frameworks and love solving complex problems with clean, scalable code. As a remote developer and stay-at-home dad, I've learned to work efficiently, communicate clearly, and deliver results in fast-paced environments. I'm driven by building products that genuinely help people and businesses succeed.…I'm a licensed Electronics Engineer who transitioned into full-stack software development, where I've found my true passion. Over the past few years, I've built web and mobile applications across various industries, from e-commerce platforms and student management systems to real-time apps. I work primarily with React, Next.js, Node.js, and modern databases, handling both frontend interfaces and backend architecture. I'm comfortable jumping into new frameworks and love solving complex problems with clean, scalable code. As a remote developer and stay-at-home dad, I've learned to work efficiently, communicate clearly, and deliver results in fast-paced environments. I'm driven by building products that genuinely help people and businesses succeed.

Available to hire

I’m a licensed Electronics Engineer who transitioned into full-stack software development, where I’ve found my true passion. Over the past few years, I’ve built web and mobile applications across various industries, from e-commerce platforms and student management systems to real-time apps. I work primarily with React, Next.js, Node.js, and modern databases, handling both frontend interfaces and backend architecture.

I’m comfortable jumping into new frameworks and love solving complex problems with clean, scalable code. As a remote developer and stay-at-home dad, I’ve learned to work efficiently, communicate clearly, and deliver results in fast-paced environments. I’m driven by building products that genuinely help people and businesses succeed.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Frontend Developer at Serino Systems Inc

May 1, 2024 - October 1, 2025

Developed and maintained React, React Native, and Next.js applications, leveraging Redux for state management and MVVM architecture for clean, scalable code. Collaborated in Agile environments, participating in sprint planning, daily stand-ups, and task estimations to ensure efficient project execution. Key contributor to the development and launch of a school enrollment system and an e-commerce web app with a food ordering and cart system, both successfully launched and running in production. Developed multiple mini-apps focused on custom hooks and Redux implementations, enabling seamless integration across various company projects. Implemented TanStack React Query for efficient data fetching, caching, and synchronization, improving app performance and reducing unnecessary API calls. Actively enhance app performance, fix critical bugs, and implement feature updates to optimize user experience. Document workflows, mini-app usage, and project release notes using Google Workspace for sea

Full Stack Developer at Trezure

September 1, 2025 - November 1, 2025

Built and maintained a fantasy sports platform using Flutter for mobile and Node.js/Express.js for backend services. Designed and implemented core features and systems in a fantasy sports mobile application. Integrated real-time sports data from SportsData.io and managed synchronization of players, games, and statistics. Utilized Prisma ORM, PostgreSQL, and Supabase for data modeling, migrations, and backend integration. Collaborated within an Nx monorepo architecture and followed GitHub Spec-Kit for structured feature specs and deployment. Deployed, configured, and optimized production environments using Codemagic, ensuring stability across staging and live builds. Developed real-time draft functionality using WebSockets, enabling live updates and seamless user interaction.

Project Engineer – Advance Engineering at Tong Hsing Electronics Inc

June 1, 2017 - December 1, 2017

Led a team of engineers and technicians, overseeing projects from raw material arrival through production to on-time delivery of final products. Achieved the highest production pass rate and maintained the lowest reject rate during my tenure, ensuring exceptional quality standards. Coordinated and led Advanced Product Quality Planning (APQP) meetings with cross-functional project leads and managers, consistently meeting project milestones. Ensured all projects were completed on schedule, with zero delays, through effective planning, task delegation, and cross-functional collaboration.

React Native Developer at COGNITH

June 1, 2024 - December 1, 2024

Developed and maintained React Native applications, primarily focusing on bug fixes, feature implementations, and UI enhancements based on client needs. Worked in short-term client engagements (typically 20-day cycles), quickly adapting to new projects within hours while adhering to strict code ownership policies. Utilized Redux for state management, implemented asynchronous API handling with runEngine, and developed within a web-based IDE with client-specific repositories. Wrote and executed Jest and Cucumber test cases, achieving 70%+ test coverage to ensure software reliability.

Software Engineer at UBIQUITY GLOBAL SERVICES

May 1, 2023 - October 1, 2023

Migrated call center web applications from Angular and Vue.js to React, improving performance and user experience. Researched and developed a call and screen recording system, transitioning from JavaScript to Python with TCP Dump for enhanced analytics. Developed a web-based agent monitoring tool for call recording, screen capture, time tracking, and performance metrics to optimize operations. Conducted code reviews and followed Agile methodologies to ensure high-quality, maintainable software.

Software Engineer at POINTWEST TECHNOLOGIES CORPORATION

September 1, 2021 - May 1, 2023

Successfully completed a three-month full-stack development bootcamp, mastering Angular, Spring Boot (Java), HTML, CSS, JavaScript, and TypeScript. Built a solo e-commerce capstone project using Angular (frontend) and Spring Boot (backend), showcasing full-stack development skills in product browsing, cart management, and order processing. Worked on multiple frontend and backend projects, switching between Angular, Vue.js, React, React Native, and Spring Boot based on client needs. Collaborated in Agile teams, contributing to code reviews, task estimations, and client meetings to demonstrate feature updates and bug fixes. Worked closely with designers and QA teams to refine UI/UX, enhance usability, and ensure a seamless user experience across devices.

Process / Failure Analysis Engineer at TOSHIBA INFORMATION EQUIPMENT

August 1, 2018 - January 1, 2019

Engaged in process optimization and failure analysis of HDDs, addressing design issues and implementing corrective actions to improve production efficiency. Conducted data analysis using Excel (VLOOKUP, PivotTables, macros) to monitor pass rates, optimize processes, and support production requirements.

Technical Support Specialist at IBM Sta. Rosa

December 1, 2017 - July 1, 2018

Provided first-level technical support to engineers, technicians, and IT personnel from Fluor, resolving hardware, software, and network issues via phone and remote assistance while maintaining high customer satisfaction and minimal downtime.

Product Configuration Engineer at ROCKWELL COLLINS (B/E AEROSPACE)

April 1, 2016 - June 1, 2017

Supervised a team of technicians in assembling aircraft galleys based on Electronic Work Instructions and ECN changes, ensuring precise implementation of design updates. Collaborated with cross-functional teams (Engineering, Manufacturing, etc.) to resolve design issues, improve BOM accuracy, and enhance the galley assembly process.