Senior Backend Engineer · Indonesia

MAS MUHAMMAD

.NET · Distributed Systems · Containerized Architectures
11 years building mission-critical backend infrastructure for Shell, Boston Scientific & Sampoerna.
Published author. Remote-work veteran. AI-integrated pipeline architect.

.NET Core C# / Go Microservices Docker 100% Delivery Rate 8+ Yrs Remote

Get In Touch View Portfolio

Years Exp.

128

DB Shards

25K+

Archives/Mo

Downtime

01 —

About

Senior Backend Engineer with 11 years of experience — including 2 years as Technical Lead — specializing in the .NET ecosystem, distributed systems, and containerized backend architectures.

Proven track record delivering mission-critical, high-availability systems for multinational clients including Shell, Boston Scientific, and Sampoerna.

Remote work veteran (8+ years) with deep expertise in async collaboration, self-directed delivery across global teams, and growing proficiency in AI-integrated backend systems.

Published author of Mastering .NET 10: Modern Backend Development — available on Amazon.

profile.json

❯ cat profile.json

// mas muhammad — system profile

"role": "Senior Backend Engineer",

"experience": "11 years",

"lead_exp": "2 years",

"primary_stack": ".NET / C#",

"secondary": "Go (Golang)",

"remote": "8+ years",

"location": "Indonesia 🇮🇩",

"availability": "Open Remote Worldwide",

"downtime_record": 0,

"delivery_rate": "100%"

❯

02 —

Tech Stack

⚙️

Languages & Runtimes

C# .NET Core 6/8/10 ASP.NET Core Go / Fiber TypeScript JavaScript Entity Framework Core

🏗️

Architecture

Clean Architecture Microservices Distributed Systems CQRS Event Sourcing DDD Multi-Tenancy RESTful API

🗄️

Databases

SQL Server PostgreSQL MongoDB Oracle / PL/SQL SQLite

☁️

Cloud & Infra

Docker Docker Compose AWS S3 Nginx Linux Windows Services GitHub Actions

🤖

AI / ML Integration

Whisper.cpp OpenRouter LLM API On-device Inference Multi-model Rotation AI Pipeline Design

🖥️

Frontend Integration

React.js Vue.js Tauri / Wails .NET MAUI KendoUI Tailwind CSS

03 —

Experience

Apr 2020 — Present

Senior Backend Engineer

Kano Solution · Remote

Solo-architected distributed backend managing 67 background jobs and 128 database shards, processing 25,000+ ZIP archives/month with zero critical downtime over 4+ years.
Led team of 3 developers as Technical Lead for Project CRA (Sampoerna) — architect, client liaison, coordinator — delivered on-time within 6-month timeline.
Established Clean Architecture foundation as team blueprint — reduced onboarding time by ~50%.
Upskilled 3 junior developers; all became independently productive within 3 months.
Maintained 5+ third-party API integrations: ERP (SAP), Fintech (Xendit), Logistics (Shipper).
Refactored monolithic legacy to modular .NET Core — reduced deployment cycle from days to hours.

C#.NET CoreSQL ServerMongoDBDockerAWS S3SSIS

Dec 2015 — Mar 2020

Software Engineer

Wiyasa / EACIIT · Remote

Sole architect for backend services powering Shell across 3+ regional business units.
Led SAP ByDesign ERP integration — eliminated ~20 hrs/week of manual data entry.
Implemented Xendit payment gateway with PCI-compliant data flow and full audit trail.
Built Power BI automated data pipeline serving 10+ stakeholders with real-time BI reporting.
Optimized SQL Server & MongoDB data layers — improved query performance by up to 70%.

C#.NET CoreSQL ServerMongoDBSAP ByDesignXenditPower BI

Jan 2015 — Nov 2015

Technical Lead / Software Engineer

Quantum Leap · Surabaya

Designed and delivered customized ERP modules for 4 clients: Inkatama Boga, MSC, Tjakrindo, and IJP.
Full-cycle role: BA, architect, developer, team lead — requirement gathering through delivery.

VB.NETPHPSQL ServerMySQLCrystal Report

Jun 2013 — Dec 2014

Backend Developer

Solusi247 · Jakarta

Managed Telkomsel broadcast system — high-traffic SMS gateway processing thousands of messages daily.
PL/SQL optimization for OLTP/OLAP — reduced report generation time by ~50%.

OraclePL/SQLSMS Gateway

04 —

Projects

Personal · Active

JobHunter

Fully autonomous career-ops pipeline — zero manual intervention from job discovery to tailored CV delivery. Runs as background daemon on hourly cron schedule.

Direct ATS API integration (Greenhouse, Lever, Ashby)
OpenRouter multi-model LLM rotation with fallback
Playwright headless Chromium PDF generation
SQLite deduplication across scan cycles

Node.jsPlaywrightOpenRouterSQLitenode-cron

Open Source · Released

WicaraAI

Cross-platform AI desktop transcription app — Whisper.cpp GGML models running fully offline on-device via FFmpeg preprocessing pipeline. Zero cloud dependency.

Tiny to Large-V3 model support
Multi-platform CI/CD: Windows + macOS parallel builds
Automated GitHub Releases via version tags

C#.NET MAUIFFmpegWhisper.cppGitHub Actions

Open Source · Released

Oats AI

Privacy-first desktop meeting assistant — single lightweight binary with no Electron overhead, no cloud dependency. Dual-panel zen-minimalist UX.

WASAPI Loopback (Win) + ScreenCaptureKit (Mac)
Whisper.cpp via whisper-rs for on-device STT
OpenRouter LLM + graceful offline fallback

RustTauri v2ReactTypeScriptWhisper.cpp

Personal · Active

Foculing TimeTracker

Privacy-first productivity tracking system — OS window monitor, idle detection via Windows API, browser extension agent. RAM footprint: ~11MB at runtime.

Workforce Health algorithm: Overworked / Disengaged detection
Rule-based categorization engine
Wails desktop UI with productivity dashboard

GoWailsASP.NET CoreSQLiteTypeScript

Open Source · Consulting

MSGlow E-Commerce API

High-performance backend for Indonesia's leading beauty brand — 1–2M daily CSV imports for product authenticity, mobile e-commerce API, multi-tenant system.

1–2M daily CSV imports with MongoDB
QR code generation for multi-channel product tracking
3 web apps: portal, admin, genuine product checker

.NET Core 6MongoDBVue.jsXenditShipper

Open Source · Architect

Academic Suite LMS

High-performance LMS for high-stakes examinations — server-side state machine, advanced anti-cheating, bidirectional streaming. Polyglot microservices.

Go (Fiber) backend + React TypeScript frontend
Full Docker multi-stage builds + Compose orchestration
Secure timers, focus tracking, anti-cheating mechanisms

GoFiberPostgreSQLReactDockerNginx

05 —

Contact

Let's build
something great.

Open to senior backend roles — remote worldwide or onsite in East/Central Java. Available for freelance consulting on high-performance distributed systems and .NET architecture.

Remote Worldwide Onsite: East/Central Java Available Now

✉️

masmuh@engineer.com

💼

linkedin.com/in/masmuh

🐙

https://github.com/masmuh