Muh. Khaerul

Fullstack Engineer - Independent Contractor

Independent Contractor • Trabajador autónomo

Dec 2017 - Present • 8 yrs 11 mos

Bank connectivity & transaction middleware Built credential-based banking automation middleware for Fintech clients across Southeast Asia and the United States, enabling business users to manage bulk transactions programmatically through their own accounts. Applied deep protocol analysis on mobile and web banking interfaces capturing and reverse-engineering native app network traffic to replicate the native-flows as a secure custom middleware layer. This is a standard connectivity approach in SEA markets where Open Banking infrastructure does not yet exist. Proposed and implemented a PIN-based authentication flow replacing OTP, reducing transaction processing time by 2–3 seconds per operation. KYC & document verification engineering Developed automated stress-testing frameworks for client-owned KYC and document verification systems. Applied protocol analysis to understand verification system behavior under edge-case inputs, then built synthetic test data generators, including identity patterns and document number sequences, to validate that fraud detection logic correctly flags invalid inputs prior to production deployment. Real-time data infrastructure Built a real-time scoring system for PORPROV (provincial-level sporting events), synchronizing live score inputs from 8 referees across 2 simultaneous field games via tablet interfaces — ensuring instant, conflict-free score updates across all displays throughout the event. How I work Fully async and remote-first — I communicate through written documentation, Loom walkthroughs, and GitHub, making collaboration smooth across time zones without requiring scheduled calls. I consistently deliver working trials, demos, and MVPs within 4–8 hours, so clients can validate ideas before committing to full builds.

IT Coordinator

KONI Provinsi Banten • Freelance

Nov 2022 - Nov 2022 • 0 mos

Led the IT technical division for the Kempo championship, overseeing the end-to-end infrastructure and real-time scoring system. TEAM SUPERVISION: Coordinated a team of 5 technical staff to handle equipment deployment and on-site support throughout the event. INFRASTRUCTURE: Managed the setup and maintenance of critical IT assets, including servers, referee tablets, and real-time scoring displays. SYSTEM MAINTENANCE: Monitored a Laravel/React refereeing application, ensuring accurate data synchronization and zero downtime during live matches. PROBLEM SOLVING: Resolved real-time software and hardware issues rapidly under high-pressure, live competition environments.

Information Technology Support

Pelindo • Tiempo completo

Sep 2016 - Dec 2016 • 3 mos

Vocational high school internship focused on assisting the IT department with daily technical operations and hardware maintenance. TECHNICAL ASSISTANCE: Helped troubleshoot basic hardware and software issues for employees. HARDWARE SETUP: Assisted in the installation and configuration of workstations, printers, and office peripherals. MAINTENANCE: Performed routine checks on computer systems to ensure proper functioning. DOCUMENTATION: Supported the IT team in organizing technical assets and equipment logs.