
Designer & Sole Developer
Kanji by Insomnius
A privacy-first study companion for Japanese kanji, vocabulary, and kana — free, in-browser, zero-account.
Muhammad Arief Rahman · Jakarta, Indonesia
I’m Arief, based in Jakarta and focused on backend engineering, Go, DevOps, and technical leadership. Since 2018, I’ve helped teams turn complex problems into software people can rely on.

Experience across teams at
Tools for learning and building, made with care.

Designer & Sole Developer
A privacy-first study companion for Japanese kanji, vocabulary, and kana — free, in-browser, zero-account.
Creator
An icon pack library inspired by react-icons but build specifically for ruby.
Real systems, practical tradeoffs, and lessons from the work.
A walk through the G-M-P scheduler, escape analysis, false sharing, and the GC — from the CPU up. With interactive demos and benchmarks you can run yourself.

Why streaming an 8 GB file through your app server is the wrong shape, and how presigned URLs and multipart uploads let the client send straight to the bucket.

How we built a scalable image detection system using perceptual hashing to catch policy-violating products—processing millions daily and catching manipulated images that traditional hashing misses.

Build a concurrent wallet app in Go using Redis-inspired serial execution. Learn how a single-threaded event loop prevents lost updates and write skew while maintaining high throughput.

Building AI-agent products and distributed systems across anti-fraud, commerce, education, and fintech.
Fraud-rule and cloud-cost improvements at Bukalapak contributed to about Rp1.4 billion in annual savings.
A Google Workspace integration cut synchronization from 7 days to 4 hours for systems serving about 58 million people.
Built a construction AI-agent product line signing about 3 customers each month, reaching $15K in monthly new contract value and $100K+ in total contract value.
Joined as Technical Lead Manager to build construction-focused AI agent products and lead engineering delivery from product design through launch.
Boon is an AI-powered workflow automation platform based in San Francisco. The platform provides AI agents that integrate with existing systems to automate operational workflows across construction and logistics industries, helping companies reduce costs and improve efficiency.
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Joined Paystone as an individual contributor on a high-scale TypeScript platform, focusing on reliability and automated feature testing.
Paystone is Canada's largest independent payment processor, headquartered in London, Ontario. The company provides integrated payment processing and customer engagement solutions, serving over 35,000 merchant locations across North America and processing more than $10 billion in transactions annually.
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Joined as Lead Software Engineer, building nationwide education systems and lecturer career platforms.
Govtech Edu is Indonesian government's development partner, driving national-scale transformation for education through technology.
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Started as a Backend Engineer, building marketplace policy, transaction safety, and abuse-prevention systems.

Bukalapak is an Indonesian e-commerce platform that connects buyers and sellers, offering a marketplace for a wide range of products, from electronics and fashion to household items. Established in 2010, it's one of Indonesia's largest online marketplaces, serving millions of users and small businesses.
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Ask about AI-agent products, anti-fraud systems, national education platforms, or team leadership.
Answers are curated from the published experience timeline.
“Arief is a manager with very strong technical depth. He is able to quickly understand complex problems, provide clear and practical technical recommendations, and execute solutions effectively. He actively monitors systems, identifies performance issues and bottlenecks, and consistently drives improvements to ensure stability and scalability. What stands out most is his ability to balance technology and leadership — he understands the details deeply while still maintaining a clear big-picture view, enabling the team to move fast without sacrificing quality.”
Evan Sujanto
Technical Lead Manager, Boon
Worked with Arief
Recommendation 1 of 9, from Evan Sujanto