Open to opportunities

Samuel Sinagara

@samuelsinagara

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Back-end Engineer crafting scalable REST APIs and microservices with Golang, Laravel, and PostgreSQL.

Indonesia

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What I'm looking for

I’m looking for a role where I can own back-end architecture—scalable REST APIs, microservices, and database performance—while integrating real-world systems (IoT/industrial) and deploying with Docker on Linux-based infrastructure.

I’m a Back-end Engineer with 3+ years of experience designing REST APIs, microservices architecture, and scalable database systems. I build reliable integrations across complex industrial workflows and keep performance, maintainability, and delivery speed in mind.

At PT Surya Selindo, I built real-time product counting, machine status monitoring, machine status history, and OEE systems, cutting reporting and analysis time by 50%. I deployed back-end and front-end services using Docker on an Ubuntu VPS with reverse proxy configuration, reducing long-term cloud hosting costs by 70%.

I focus on backend architecture and system integration: I implemented IoT integration for oil blending and SCADA systems using MQTT (EMQX), OPC UA, Modbus TCP/IP, and goroutines with controlled thread lock. On the data layer, I optimized database structure and query performance using Redis and PostgreSQL.

I also develop full-stack features when needed—building REST APIs and microservices using Golang (Echo, Gorm), creating ERP inventory and supply chain workflows with Laravel, React, and PostgreSQL, and integrating services like WhatsApp API (Twilio) and SMTP email. I’m currently expanding into a semantic search engine backend with a multitenant microservices approach and OpenAI LLM API integration.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Engineer (Independent Project)

Current

Howtaku Tech Indonesia

Jun 2025 - Present (1 year 1 month)

Designed and built a semantic search engine backend architecture with microservices, multitenancy, and database segregation. Integrated OpenAI LLM API, implemented scalable RESTful APIs and search indexing, and supported payment gateway integration including KYC compliance and business registration.

Semantic Search Microservices Architecture Database Segregation REST APIs Indexing OpenAI API Payment Integration KYC Compliance

Current

Full-Stack Developer & IoT Engineer

Current

PT Surya Selindo

May 2024 - Present (2 years 2 months)

Built real-time product counting, machine status monitoring/history, and OEE systems, reducing reporting and analysis time by 50%. Developed REST APIs and microservices in Golang, implemented IoT integrations (MQTT/OPC UA/Modbus), and optimized backend performance using PostgreSQL and Redis.

Go Echo Gorm REST APIs Microservices Laravel React PostgreSQL Redis Docker Reverse Proxy IoT MQTT OPC UA Modbus Database Optimization ERP Systems SMTP PrimeReact PrimeReact PrimeFlex PrimeIcons

Front-End Web Developer

PT Alam Sampurna Makmur

Jun 2023 - Mar 2024 (9 months)

Built reporting modules (invoice, goods receipt, outbound reports) and interactive reporting dashboards using React, including PDF generation and data visualization. Implemented Excel export and location-based functionality with Google Maps, and developed reusable UI components using PrimeReact.

React PrimeReact PrimeFlex PrimeIcons Xlsx Populate Data Visualization Google Maps Reporting Module

Full-Stack Web Developer Internship

PT Lumos Inisiatif Indonesia

Developed landing page components using Laravel Blade, Bootstrap, and vanilla CSS, and applied SDLC best practices. Implemented repository pattern as part of software development practices.

Laravel Bootstrap SDLC