About Me
I build dependable backend systems, integrations, and dashboards for teams that run real operations.
I’m Rayhan, an Indonesia-based software engineer focused on systems that keep day-to-day work moving. I’m strongest when the problem is not just "build an app," but creating workflows teams can trust: clear transaction status, live device data, staff permissions, audit trails, and software that remains maintainable after launch.
I’ve led engineering work on remittance and payment gateway products, built multi-protocol IoT backends, integrated operational dashboards, and worked on an ERP-style hotel management system. The common thread is software that follows how teams work in the field, not just something that looks good in a demo.
Values & Work Philosophy
Reliability First
I design for audit trails, recovery paths, and predictable behavior, especially when money, devices, or front-desk operations depend on the system.
Honest Scope
I’m strongest in backends, APIs, integrations, and dashboards. I’ll say early when a request needs a specialist, extra discovery, or a simpler operational workaround.
Partner Communication
You’ll get clear updates, trade-off explanations, and visible progress, so important choices are made together instead of appearing at the end.
Operational Ownership
I care about what happens after launch: monitoring, incident recovery, documentation, and support that keeps the system useful.
Experience Timeline
IoT & ERP Foundations
Started with water meter telemetry, warehouse management, and plan maintenance systems — learning how real-world operations depend on reliable backend flows.
Head of IT — Remittance & Payment Gateway
Led a nine-person engineering team across cross-border remittance and payment gateway products. The focus was a licensed production system, traceable transaction status, compliance review support, and operational dashboards the team could use.
Freelance IoT & Operations Systems
Built multi-protocol device monitoring (Modbus, MQTT, BLE, WebSocket), visitor management integrations, smart locks, vending machine telemetry, and a commissioned photo booth kiosk app for a Photobox client — camera capture, QRIS payment, templates, GIF output, printing, and QR-based download.
Hotel Platform & IoT Vending
Helped build a multi-role hotel management system with WhatsApp automation, plus IoT vending machine telemetry and monitoring.
Skills & Tech Stack
Technologies I work with daily