Open to opportunities

Muh Khaerul

@muhkhaerul

Message

Backend Engineer specializing in secure APIs, protocol analysis, and automation for fintech.

Indonesia

Message

What I'm looking for

I’m looking for backend work where I can tackle complex system design, secure API integrations, and legacy modernization. I thrive in fully async, remote-first teams where I can deliver fast trials/MVPs and solve real operational problems.

I’m a Backend Engineer with 5+ years of experience building high-performance backend systems, especially in the freelancing engine of complex applications. I focus on DevOps-driven backend architectures, secure API integrations, and automating financial workflows.

In my recent work, I’ve pivoted from standard web development to deep Systems Engineering. One example is a Southeast Asia (SEA) and USA banking prototype where I used Node.js and Go to handle secure transaction logic and high-throughput API communication.

I specialize in Legacy System Modernization through Reverse Engineering and Process Automation—creating modern API wrappers for undocumented protocols to ensure seamless system interoperability. I also prioritize secure, reliable flows such as a PIN-based authentication flow replacing OTP, reducing transaction processing time by 2–3 seconds per operation.

How I work is fully async and remote-first: I collaborate through written documentation, Loom walkthroughs, and GitHub. I consistently deliver working trials, demos, and MVPs within 4–8 hours, and I like solving difficult backend and system-design challenges under real constraints.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer

Current

Independent Contractor

Jan 2018 - Present (8 years 3 months)

Built credential-based banking automation middleware for fintech clients, using deep protocol analysis to replicate native mobile/web transaction flows securely for Southeast Asia and US use cases. Implemented a PIN-based authentication flow that reduced transaction processing time by 2–3 seconds per operation.

TypeScript Go C API Integration DevOps Authentication Reverse Engineering Middleware Development Real Time Systems

IT Coordinator

KONI Banten - Porprov VI Banten 2022

Nov 2022 - Nov 2022 (0 months)

Led the IT technical division for the Kempo championship, coordinating a team of 5 to deploy event infrastructure and provide on-site support. Managed servers, referee tablets, and real-time scoring displays while monitoring a Laravel/React refereeing application to ensure accurate synchronization with zero downtime during live matches.

Infrastructure Management IT Operations Laravel React Systems Monitoring Hardware Support Team Coordination Incident Response

Web Developer

PT Asacreative Technology Indonesia

Aug 2020 - Sep 2020 (1 month)

Developed a web application using the MERN stack and supported end-to-end implementation for assigned features.

JavaScript MongoDB React REST APIs MERN Stack Web Application Development Version Control

IT Intern

PT Pelabuhan Indonesia IV (Persero)

Oct 2018 - Dec 2018 (2 months)

Assisted the IT department with daily technical operations, troubleshooting basic hardware/software issues and supporting workstation and peripheral setup. Helped maintain routine checks and contributed to organizing technical assets and equipment logs.

IT Support Technical Troubleshooting Documentation Desktop Support