Prince Siachin Pasombaran

Frontend Developer (Web - Mobile) at PT Indonesia Jaman Sekarang

Designed and implemented responsive and user-friendly UI/UX for web and mobile; developed and maintained a cross-platform booking application; delivered the website to production and adopted by 12,000+ customers within the first 6 months, significantly contributing to company revenue growth. Optimized performance by removing unnecessary assets, converting images to WebP, eliminating redundant code, and implementing session & caching strategies for faster load times. Initiated and led a complete redesign of the web and mobile app in the absence of a dedicated UI/UX designer, ensuring a modern and user-friendly interface. Built the mobile app version of the booking engine using React Native for iOS and Android; deployed to Google Play Store with performance optimization and release management. Debugged, fixed, and refactored code to resolve critical issues, enhance stability, and improve overall maintainability. Collaborated with product managers, customer service, administrators, legal,

Full-Stack Developer at PT Andalan Banua Sejahtera (ABase)

Contributed to the development of an ERP system covering frontend and backend modules. Built several custom hooks to handle state changes using useReducer and useContext, wrote custom functions to help conversions, and reusable logic like data fetching and form handling. Developed a purchase order module feature that optimized UI rendering, ensuring that adding items or updating supplier/customer fields did not trigger unnecessary re-renders or state resets. Designed and maintained API endpoints, improving performance by reducing payload size through selective field transfers and efficient JSON formatting. Identified and refactored inefficient code, doubling request speed and increasing overall application stability. Standardized requirements, software product definition, code structures, naming conventions, file structures, and Git flow when pushing or merging code; mentored the team to improve code quality and productivity.

Full-Stack Developer & UI/UX Designer at Freelance

Delivered end-to-end development for multiple client projects, including 10+ clients with 5 mobile applications, 3 websites, 5 UI&UX designs, and 2 product designs. Designed and built user-focused interfaces with Figma, ensuring usability, accessibility, and alignment with client requirements. Enhanced user experience by aligning technical solutions with business goals and market needs; debugged, optimized, and refactored code, improving performance, reducing bugs, and accelerating delivery timelines. Collaborated directly with clients to gather requirements, define project scope, and provide technical consultation, ensuring projects were delivered on time and met business objectives. Built and deployed applications using React Native (iOS & Android), React.js for web, and Node.js with Express.js for backend development. Leveraged Firebase Realtime Database and MongoDB for data management, implemented GitLab CI/CD and Heroku for version control and deployment, integrated Twilio for mes

Full-Stack Developer & UIUX Designer (Internship) at PT Erevna Raya Teknologi

Gained first professional coding experience, learning frontend development with Semantic HTML, CSS, JavaScript, jQuery, Bootstrap, and Emmet.js, then advancing to backend development using Node.js, Express.js, and MongoDB. Assigned to develop a full-stack school management system for high schools, including CRUD functionalities for students, teachers, classes, and staff; barcode scanning to streamline attendance; authentication and authorization to secure different user roles; dashboards and reporting. Learned Git and SSH for collaboration, code management, and deployment; mentored on coding standards, project structure, and best practices.

Mobile Engineer at PT Bank Rakyat Indonesia (Persero) Tbk

Built a high-complexity geospatial pipeline for customer acquisition with multi-layer map rendering (polygons, clusters, markers, and H3 grids) and dynamic zoom-based behavior. Managed complex state across map data, filters, pagination, and submission workflows; refactored shared utilities; restructured Redux state management; standardized API/service layers; resolved critical production issues; ensured reliable native (iOS/Android) and React Native integration; performed performance optimizations.

Full-Stack Developer & UIUX Designer at Self Employed - Remote

Delivered end-to-end development for multiple client projects (mobile apps, websites, 5 UI/UX designs, 2 product designs). Designed interfaces in Figma, implemented Firebase Realtime Database and MongoDB data management, integrated Twilio for messaging, and deployed via GitLab CI/CD and Heroku. Improved performance, reduced bugs, and ensured timely delivery while mentoring client teams.

Full-Stack Developer & UIUX Designer (Intern) at PT Erevna Raya Teknologi

Gained early professional coding experience; developed a full-stack school management system (CRUD for students/teachers/classes, attendance barcode scanning, authentication/authorization, dashboards) and collaborated with senior developers using Git/SSH.

Mobile Engineer at PT Bank Rakyat Indonesia (Persero) Tbk - Central Jakarta

Built a high-complexity geospatial pipeline system for customer acquisition workflows with multi-layer map rendering and dynamic zoom-based behavior; managed complex state across map data, filters, pagination, and submission workflows; refactored shared utilities; restructured Redux state; standardized API layer; resolved production issues; ensured reliable native-React Native integration; performed performance optimizations.

Frontend Developer (Web - Mobile) at PT Indonesia Jaman Sekarang - Central Jakarta

Designed and implemented responsive UI/UX for web and mobile; developed a cross-platform booking application adopted by more than 12,000 customers in the first six months; led a complete redesign of web and mobile apps; built the mobile app in React Native and deployed to Google Play; collaborated with product, customer service, backend, QA, and design teams to ensure seamless integration and performance.