Open for Opportunities

Hi, I'm Samuel Rantung

Full Stack & Frontend Developer

Specializing in high-performance React, Next.js, React Native, and Node.js solutions. Focused on clean code, UI/UX fidelity, and robust application architectures.

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Biography

Crafting robust applications with CS & Management expertise

I am a developer combining a strong technical foundation in Computer Science with strategic insights from my Management background. I thrive in cross-functional agile teams, translating complex mockups into pixel-perfect, highly responsive interfaces, and engineering robust, scalable backends.

With experiences spanning mobile development (React Native, Ionic/Angular), frontend (Next.js, React), and backend pipelines (Node.js, Express, FastAPI, databases), I specialize in shipping end-to-end features that prioritize performance and clean code.

Education
Expected Jan 2027

Master of Management

Universitas Klabat (Indonesia)

Major in Marketing; Minors in Mathematics and Psychology | Current GPA: 3.93/4.0

Coursework: Business Operations, Strategic Talent Management, Consumer Behavior Analysis, Strategic Tech Management.

Summa Cum Laude

Bachelor of Computer Science

Universitas Klabat (Indonesia) – Sep 2022

Major in Informatics | Cumulative GPA: 3.91/4.0

Coursework: Web Development, Mobile Applications, Computer Security, Database Management, Project Management, Systems Analysis.

Capabilities

Technical & Leadership Skillset

A comprehensive toolkit spanning clientside frameworks, backend endpoints, database tools, and agile product management.

Frontend & Mobile

ReactJSNext.jsReact NativeAngularIonicTypeScriptJavaScriptHTML5/CSS3SASSTailwind CSSBootstrapHandlebars

Backend & Logic

Node.jsExpress.jsPythonFastAPISequelize ORMREST APIsMVC Architecture

Databases & Tools

PostgreSQLMongoDBFirebaseGitCI/CD PipelinesFigmaData AnalysisSequelize

Management & Soft Skills

Team LeadershipProject ManagementAgile/ScrumSystems AnalysisCritical ThinkingProblem SolvingCross-functional Collab
Work History

Professional Journey

Frontend

Frontend Developer

Virtual Spirit
Jul 2025 – Jan 2026
Selangor, Malaysia (remote)
  • Architected and maintained the core admin web application (Membership Ninja) using TypeScript, Handlebars, and Metronic.
  • Developed complex UI workflows (drawers, modals) and advanced DataTables features including custom grouping, selection, and dynamic rendering.
  • Built and deployed end-to-end features for Kohbus Web App, bridging UI components with robust API integrations with a focus on performance, long-term maintainability, and clean code.
Technologies Used:
TypeScriptHandlebarsMetronicAPI IntegrationDataTables
Full Stack

Full Stack Developer

Ifabula
Jan 2023 – Jul 2025
Jakarta, Indonesia (remote)
  • Cross-functionally led a high-performing agile team consisting of Developers, QA Engineers, Business Analysts, and Project Managers to ensure timely and smooth project delivery.
  • Developed and scaled cross-platform mobile applications for Prudential Indonesia using React Native, strictly adhering to the rigorous enterprise code architecture and compliance standards of Prudential Hong Kong.
  • Engineered robust CI/CD platform backend (Amplio) using Node.js, Express.js, and TypeScript, designing scalable relational data models with PostgreSQL and Sequelize ORM.
  • Developed responsive frontend portals for Amplio using Next.js with Material-UI.
  • Scaled, modernized, and optimized client-side features for the Toyota Official Store Solution utilizing Next.js, React.js, Bootstrap, and SASS.
Technologies Used:
Next.jsReact JSReact NativeNode.jsExpress.jsPostgreSQLSequelize ORMTypeScriptSASSBootstrapAgile Leadership
Mobile

Mobile Developer

Nadi Health
May 2022 - Dec 2022
Malaysia (remote)
  • Developed and deployed cross-platform health-tech mobile applications for iOS and Android platforms utilizing the Ionic Framework (Cordova & Capacitor), Angular, and TypeScript.
  • Seamlessly interconnected three foundational application ecosystems: myPharma, myDoctor, and myHappiness.
  • Built secure user Authentication, Push Notifications, Transaction History tracking, Geolocation services, LiveChat, advanced search indexing, and Billplz payment gateway integration.
  • Partnered closely with the cybersecurity team to identify vulnerabilities, mitigate risk vectors, and fortify the application against security threats.
Technologies Used:
AngularTypeScriptIonicCordovaCapacitorPayment IntegrationMobile SecurityPush Notifications
Mobile

Mobile Developer

PT. Elektronik Distribusi Otomatisasi Terkemuka (eDOT)
Feb 2022 – May 2022
Bandung, Indonesia (remote)
  • Built and shipped an internal management system website from scratch using Next.js to automate and broadcast WhatsApp messages to large customer segments.
  • Created and deployed highly interactive features for the main commercial eDOT mobile application using React Native.
  • Translated complex Figma design specifications into reusable, pixel-perfect, and highly responsive components, guaranteeing design system uniformity.
  • Collaborated with back-end engineers to troubleshoot critical bugs and proactively refactored code to prevent regressions, increasing application stability.
Technologies Used:
Next.jsReact NativeFigma to CodeAPI IntegrationRefactoringWhatsApp APIs
Full Stack

Full Stack Developer

PT. Klabat Tekno Perkasa
Jan 2021 – Dec 2021
Manado, Indonesia
  • Led the end-to-end development (UI/UX design, frontend, and backend) for an Android application designed for local citizens to check vehicle taxes, built utilizing Figma, React Native, and Firebase.
Technologies Used:
React NativeFirebaseUI/UX DesignFigmaAndroid Development
Showcase

Featured Projects

March 2026 - Present

WhatsApp Blast Customer Retention Engine

A Machine Learning-powered churn prediction pipeline integrated with automated messaging channels to improve customer retention.

  • Random Forest classifier trained on RFM features achieving 80.18% accuracy & 0.88 ROC-AUC.
  • Automated retention flow from transaction data to personalized WhatsApp dispatch via Meta Cloud API.
  • FastAPI REST layer for backend inference and orchestration.
PythonFastAPIMachine LearningRandom ForestRFM AnalysisMeta Cloud API
Jan 2025 - Present

Manado Adventist Hospital Systems

Full hospital information management web suite. Spearheaded frontend development architecture and project delivery.

  • Led and directed a cross-functional team of 7 developers.
  • Designed and set front-end codebase architecture and coding patterns.
  • Conducted rigorous code reviews and quality assurance check points.
Next.jsReact.jsTypeScriptTailwind CSSTeam Leadership
Nov 2022

Manado Post Mobile Application Revamp

Comprehensive UI/UX design overhaul and development of the official Manado Post mobile publication app.

  • Sliced and developed high-performance screens from modern Figma design specs.
  • Implemented modular and highly reusable custom UI components.
  • Ensured pixel-perfect rendering and native-level scrolling performance.
React NativeJavaScriptMobile UI/UXFigma to CodeAndroid & iOS
Get In Touch

Let's create something together

Have an idea, project, or full-time position you want to discuss? Click the button below to reach out directly on WhatsApp. I usually respond within a few hours!

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