Karl Steven F. Requinto
I'm a licensed Electronics Engineer who transitioned into full-stack software development, where I've found my true passion.
About
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.
- 6 years' experience
- Joined December 2025
Industry experience
- Software & Internet
- Education
- Retail
- Professional Services
- Other
Work experience· 9 roles
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.
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.
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
Education
Certifications and awards
Hire Karl Steven F. Requinto today
Post a job and invite Karl, or contact them directly. No hidden commission.