System Design
That Little Square Does a Lot: How QR Codes Actually Work
Apr 15, 2026 · 12 min read
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Systems · Backend · AI EngineeringPractical engineering
by Ratnesh Maurya · Software Engineer at Initializ
Practical engineering
for real-world systems
Deep dives on backend, distributed systems, and AI engineering by Ratnesh Maurya — plus curated daily digests for builders who ship.
by Ratnesh Maurya · Software Engineer at Initializ14 Posts69 Technical Terms80 News Digests
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Term of the day
ACID
ACID (Atomicity, Consistency, Isolation, Durability) defines four properties that guarantee database transactions are processed reliably, even during crashes, errors, or concurrent access.
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Backend engineering, distributed systems, system design, developer productivity, and practical AI engineering written from real-world building and debugging.
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Most posts aim for clear first, deep second. You will find high-level explanations, concrete examples, and links to go further.
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