I'm Samuel Sihotang
- Software Engineer
Portfolio
Explore what I’ve been working on
About Me
Turning ideas into real applications
2+
Years of experience
Full-stack Software Engineer delivering retail ERP, POS, and loyalty platforms with Laravel, Angular, Ionic Angular, React, and .NET. Specializes in cross-system integration, multi-tenant architecture, and database performance tuning, cutting redundant API calls by 40% and developer debugging time by 70%.
Name Samuel Sihotang
Phone +62 895-6123-60693
Email samsihotang1@gmail.com
Location Jakarta, Indonesia
Resume
Practical experience and education
Work experience
IGCY Singapore
Junior Software Engineer
- Feature Engineering & Cross-System Integration: Tasked with launching a referral programme that had to stay consistent across a fragmented retail stack, designed and integrated an affiliate promotion system across 3 core platforms (Loyalty App, POS/Cashier, and Admin Panel), enabling real-time voucher redemptions, driving a 25% boost in organic user acquisition, and providing 100% data transparency for referral tracking.
- Architecture Refactoring & Developer Experience Optimization: Inherited a legacy Android-bound Ionic Angular codebase that slowed every debugging cycle; refactored it into a Progressive Web App (PWA) using an environment-based database strategy (SQLite WASM & SQLite Cordova), accelerating developer debugging time by 70% while preserving existing business logic and core system functionality seamlessly.
- Client & Database Performance Tuning: Assigned to cut server load on data-heavy ERP and POS screens, optimized system performance by implementing infinite scrolling, search debouncing, and relational database table normalization, cutting redundant API calls by 40% and significantly reducing server workload.
- Multi-Tenant Architecture & Data Isolation: With a single shared codebase serving multiple enterprise retail clients, designed a reusable entity-scoping layer with role-based access control and rolled it out across 4 module families (promotion, customer, merchandising, and loyalty), enforcing per-tenant data isolation centrally and eliminating repetitive manual checks from every query.
- Platform Scalability: Responsible for keeping reporting responsive as transaction volume grew, implemented monthly table sharding across high-volume sales-detail and receipt tables with targeted indexes, cached count queries, and batched synchronisation jobs.
PT Tera Multi Wahana
IT Developer Intern
- Developed a REST API in C# and the .NET Framework that exposed database operations as endpoints for front-end consumption.
- Built a Dart and Flutter web application for data processing and reporting.
- Built a XAML desktop application for day-to-day data management.
PT Infosys Solusi Terpadu
Backend Developer Intern
- Engineered Java middleware on the Software AG platform for a financial program.
- Implemented a data validation layer that hardened the security and integrity of the program's data flows.
My education
Institut Teknologi Del
Bachelor's Degree in Information Systems
- Graduated with a GPA of 3.65 out of 4.00.
- Chairman of the Association Consultative Assembly, and Vice Chairman of the Del Programming Club from September 2023 to April 2024.
- Coursework centred on information systems, databases, and software engineering, applied through the projects in this portfolio.
Infinite Learning
Certified Independent Study in Web Development and UI/UX Design, MSIB
- Completed a certified independent study track under the MSIB programme, covering web development and UI/UX design.
- Built and shipped course projects end to end, from interface design through to a working web application.
My technical skills and tools
Angular
Ionic
Laravel
React JS
Flutter
MySQL
Tailwind CSS
HTML5
CSS3
Javascript
TypeScript
PHP
Dart
C#
.Net
Livewire
Java
Go
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