I built a free, privacy-friendly QR code generator that runs entirely in the browser. Supports URLs, text, email, phone, and WiFi. Customize colors, sizes, and error correction levels. Download as PNG or SVG. No signup, no tracking, no server-side processing.
Gossip protocol (also called epidemic protocol) is a decentralized communication pattern where nodes share information by randomly selecting peers and exchanging state at regular intervals. Each node picks a small number of random peers (typically 1 to 3) every second and shares its view of the cluster. Information spreads exponentially, reaching all nodes in O(log N) rounds. It is used for cluster membership, failure detection, and state propagation in systems like Cassandra, Consul, and DynamoDB.
Complete breakdown of X's open source recommendation algorithm. Learn how the For You feed works, including the Grok-based transformer model, candidate pipeline architecture, and real-world lessons for building recommendation systems at scale
Built a regex tester that explains what each part of your pattern does. Shows matches in real-time, visualizes capture groups, and runs 100% client-side (nothing sent to servers). Includes a cheat sheet and common pattern examples. Free, no signup.
Explains Snowflake IDs—the 64-bit distributed ID system used by Twitter, Discord, and Instagram. Includes the bit structure breakdown, code examples for extracting timestamps, Java implementation, and database performance comparisons with UUIDs.
Covers:
- The quorum formula (floor(N/2) + 1)
- Why W + R > N guarantees consistency
- Real examples from Cassandra, ZooKeeper, etcd
- How quorum prevents split-brain during network partitions
- The tradeoffs between read and write quorums
Key points covered:
- How SSE works over plain HTTP (no protocol upgrade needed)
- The EventSource API's built-in auto-reconnect with Last-Event-ID
- Real implementations: Node.js server, scaling with Redis Pub/Sub
- Common pitfalls: proxy buffering, connection limits, memory leaks
- When to choose SSE vs WebSockets vs Long Polling
The auto-reconnection feature is the killer - browser automatically resends Last-Event-ID header so your server can resume the stream without missing events. No manual implementation needed.
Working code examples included. Happy to answer questions about production deployments.
Covers:
- How long polling actually works under the hood
- The timeout dance (browser limits, proxy limits)
- Common pitfalls: connection starvation, thundering herd, memory leaks
- Scaling with Redis Pub/Sub
- When to use it vs WebSockets vs SSE
Internal documents seen by Bloomberg and SourceMaterial reveal AWS uses a mix of large campuses and colocation sites to rapidly scale without building new facilities. Also covered: Canon ransomware via Oracle zero-day (CVE-2025-61882), Meta negotiating to buy Google TPUs, and White House Genesis Mission combining AI + quantum computing.
Weekly dev news roundup: TypeScript compiler rewritten in Go (10x faster), .NET 10 LTS ships with major performance gains, Python 3.14 released with free-threaded execution, React Native critical vulnerability affects 2M projects, and Microsoft announces $10B AI infrastructure investment in Portugal.
Deep dive into failure detection patterns used by Kubernetes, Cassandra, HAProxy, and etcd.
Covers the math behind timeout calculations, Phi Accrual failure detection, and preventing
split brain scenarios. Includes sequence diagrams for each pattern.