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Muhammad Raja Zahran
From Indonesia 12:25 PM (GMT+07:00)
$20/hr or $65,000/yr

Active over a week ago


Member since May 2026

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Backend Engineer

Back-end Engineer
Available for hire
Years of experience
2+ years
Experience level
Junior
Available for
Full-time, Freelance
Available from
08 Jul 2026
Download Resume / CV

Backend engineer specializing in billing systems and payment infrastructure.

In my current role, I built an ISP billing backend end-to-end as the sole engineer designing the architecture, integrating payment gateways, and automating service provisioning. The result: activation time dropped from ~5 minutes to 10–20 seconds, and manual provisioning was eliminated entirely.

My stack: Python, PostgreSQL, Redis, RabbitMQ, Docker. I write idempotent webhook handlers, design outbox patterns for reliable event delivery, and optimize queries for high-traffic billing reports.

I work well independently, communicate proactively, and ship systems that stay stable under load, not just code that works on my machine.

Looking for backend or full-stack roles where reliability and payment/billing domain knowledge actually matter.

Employment History

Software Engineer at Dikta Teknologi Current 2025 - Now
Built and owned an ISP billing backend end-to-end from architecture to production. - Designed billing system in Flask + PostgreSQL with idempotent payment webhook handlers (Midtrans, Xendit) and automated service provisioning to FreeRADIUS via direct DB writes - Implemented JWT auth, Redis-based rate limiting/session management, retry/backoff logic, and outbox pattern for reliable event delivery - Exposed real-time subscriber status via WebSocket; added structured logging and health/readiness probes - Optimized PostgreSQL queries with composite indexes and cursor pagination for high-traffic billing reports - Shipped React + Ant Design frontend (onboarding, reporting, data exports) Result: Service activation time dropped from ~5 minutes to 10–20 seconds. Manual provisioning eliminated. Support tickets related to activation dropped significantly.
Backend Developer Intern at Magna Teknologi Solusindo 2024 - 2024
6-month backend internship focused on API development and database optimization. - Delivered ASP.NET Core REST APIs and MVC endpoints with request validation, error handling, and integration tests; shipped bug fixes across multiple services surfaced in QA - Rewrote slow SQL queries and stored procedures in PostgreSQL / SQL Server — eliminated N+1 patterns, added pagination and covering indexes, cut report query times significantly - Added Serilog structured logging and health-check endpoints consumed by downstream monitoring - Tools: Git, Bitbucket

Education

Bachelor Of Computer Science at BINUS Online Current 2025 - Now