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Jonathan Jhonielyne Jamer

@jonathanjhonielyneja

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Software Engineer building a POS and accounting application with React, NestJS, and PostgreSQL.

Philippines

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As a freelance Software Engineer, I developed a full-stack point-of-sale and accounting web application using React, NestJS, and PostgreSQL. I designed REST APIs and implemented sales, inventory, customer, and receipt management features.

At Core1 Technologies Corp, I developed a real-time messaging application using WebSockets and set up GitHub Actions deployment pipelines. I also managed AWS EC2 instances and configured Route 53.

At St. Gabrielle HRS, I built React interface components and implemented Next.js and TypeScript. I also created UI/UX prototypes in Figma and edited visuals in Photoshop.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Freelance

Nov 2025 - Present (11 months)

Developed a full-stack point-of-sale (POS) and accounting web application using React, NestJS, and PostgreSQL. Designed scalable REST APIs and implemented sales, inventory, customer, and receipt management features.

React NestJS PostgreSQL REST API Design POS Accounting

Current

Full-stack Developer

Current

Core1 Technologies Corp

Aug 2024 - Present (2 years 2 months)

Developed a real-time messaging application using WebSockets, set up CI/CD pipelines with GitHub Actions, and managed AWS infrastructure. Implemented security measures including JWT authentication and CSRF tokens.

WebSockets GitHub Actions EC2 Route 53 Docker Tailwind Shadcn Ui JWT CSRF HTTPS HttpOnly Cookies

Full-stack Developer

ICS Next Build Corp

Apr 2025 - Jun 2025 (2 months)

Developed a responsive web application for a construction company, including a dynamic CMS and user management system with authentication and role-based access control. Collaborated with stakeholders to gather requirements and improve features.

React NestJS CMS Authentication Role Based Access Control UI Components

Frontend Developer

St. Gabrielle HRS

Oct 2023 - Feb 2024 (4 months)

Built modern UI components using React.js and implemented Next.js for performance. Designed UI/UX prototypes in Figma and managed version control with Git and GitHub.

React Next.js TypeScript Figma Photoshop Git GitHub Mobile Responsive Design