I'm Jack Du En Jie.
I am a full-stack software engineer with around five years of experience in developing web applications, mobile applications, and Windows desktop systems. I have strong background in modern JavaScript frameworks (React.js & Next.js) and experience in independently owning the complete Software Development Life Cycle (SDLC), including requirement analysis, system and database design, frontend and backend development, deployment, and long-term maintenance. I have successfully delivered multiple production systems across different platforms, demonstrating my ability to manage projects from concept to completion.
One of my key strengths is my ability to work independently and complete tasks efficiently within reasonable timeframes while maintaining high code quality. I am highly adaptable and capable of handling complex technical challenges, particularly in building highly customized systems. I have extensive experience developing dynamic and flexible components, such as generating UI pages based on JSON configuration files and building advanced 2D sketching systems capable of rendering up to 20 million shapes. These experiences have strengthened my problem-solving skills and my ability to design scalable and high-performance architectures.
In addition to technical expertise, I work closely with backend engineers, UI designers, and cross-functional engineering teams to ensure smooth system integration, accurate UI implementation, and optimized performance. I value clear communication and teamwork, and I actively share knowledge by mentoring interns and supporting junior developers in adopting best practices.
I am passionate about learning new technologies and continuously improving my technical capabilities. I am currently seeking opportunities in Singapore in front-end, back-end, or full-stack software engineering roles where I can contribute my skills, grow professionally, and collaborate with experienced teams to build high-quality and impactful products.
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}- Fully in charge of the development of two enterprise internal systems: the Employee Daily Activity System and the Bill of Materials (BOM) System. Responsible for system design, development, deployment, and long-term maintenance (React.js, Hapi.js, MySQL).
- Developed and maintained Windows and Android applications using .NET MAUI, implemented new features and enhanced existing modules while ensuring smooth integration with legacy codebases (.NET MAUI, RabbitMQ, MSSQL).
- Led frontend migration from .NET MAUI to Next.js and continues to expand functionality and optimize user experience.
- Built numerous custom UI components and business features to meet highly customized enterprise requirements.
- Collaborated with backend engineers, UI designers, and cross-functional engineering teams to deliver intuitive, high-performance systems, ensuring seamless frontend-backend integration, accurate UI implementation, thorough testing, performance optimization, and mentoring juniors and interns on development best practices.
- Independently designed and developed the Rocket Membership System from scratch. Involving requirements analysis, system architecture & database design, frontend & backend development, server setup & deployment, hosting & maintenance.
- Developed 1 web system and 1 landing page using React.js & 2 mobile apps using React Native (Expo).
- Built backend services using Hapi.js, designed and managed databases with MySQL and Redis.
- Set up and maintained VPS servers and production hosting, managed deployments and ensured 24/7 system availability.
- Published mobile apps to app distribution platforms (Google Play / App Store).
- Developed a complete Referral Mobile App using React Native (Expo) for internal use.
- Took over and completed a semi-finished PHP web version of the Referral System.
- Developed dozens of backend APIs using PHP to integrate with MySQL database.