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Javier Alarcón

Infrastructure engineer specializing in networking, Linux systems, Kubernetes, and cloud architectures. Covers hardware, networking, observability, and engineering practices for production teams.
Diagram of a service mesh with Envoy sidecars connecting microservices in Kubernetes
Tech News

Service mesh: how Envoy manages traffic without touching your code

A service mesh separates network logic from your microservices and delegates it to a sidecar proxy like Envoy. In this guide, you’ll install Istio, configure mTLS, and perform a canary release step by step.

By Javier Alarcón, 1 month12 September, 2026 ago
Diagram of Visa and Mastercard card networks connecting banks and merchants
Networking

Visa and Mastercard Aren’t Banks: How Their Payment Networks Work

Visa and Mastercard don’t issue cards and aren’t banks: they’re networks that connect issuers, merchants, and acquirers. We explain the four-party model, authorization, clearing, and settlement with code examples for developers.

By Javier Alarcón, 1 month10 September, 2026 ago
AMD BC-250 board with the PlayStation 5 APU repurposed as a gaming PC
Tech News

AMD BC-250: The Recycled PS5 APU That Builds a Gaming PC for $70

The AMD BC-250 is a PlayStation 5 APU discarded for console use that ended up as a crypto mining board and today, with hardware and firmware mods, becomes a low-cost gaming PC. It costs between $70 and $100 on the secondhand market and runs titles like Cyberpunk 2077, GTA V, Counter-Strike 2, and Hitman 3.

By Javier Alarcón, 1 month5 September, 2026 ago
Mistral privacy panel with the training opt-out toggle
Tech News

Mistral Lets You Opt Out of Using Your Data for AI Training

Mistral documents how to enable the training opt-out in Vibe, the mobile app, and the API: two separate toggles that you need to configure yourself. The exact steps vary depending on whether you use the consumer plan, Vibe Enterprise, or Mistral Studio.

By Javier Alarcón, 1 month3 September, 2026 ago
Stacked GPU chips representing the GPU World contest on abundant AI
Tech News

GPU World: AI Story Contest Awards $100,000

GPU World is a short story contest imagining a 2040 with billions of GPUs available to all of humanity, even if AI progress freezes in 2026. It awards $100,000 in prizes, judged by Neal Stephenson, Gwern Branwen, and Matt Huang. Submissions close on October 31, 2026.

By Javier Alarcón, 1 month1 September, 2026 ago
Diagram of erasure coding splitting a file into data and parity fragments
Tech News

Erasure Coding: How HDFS Cuts Replication Cost from 200% to 50%

Erasure coding splits data into fragments and computes mathematical parity to tolerate disk failures without tripling storage. This article explains how Reed-Solomon works, includes functional Python code, and compares it to RAID 6 and classic replication.

By Javier Alarcón, 2 months30 August, 2026 ago
Diagram of a CDN distributing content across edge caches
Tech News

CDN: How the Network That Brings Your Website Closer to Users Works

A CDN is a network of servers that stores copies of your content close to each user so pages load faster. This guide explains edge caching, anycast routing, and how to configure it with real examples in Nginx and Cloudflare Workers.

By Javier Alarcón, 2 months28 August, 2026 ago
Diagram of Cloudflare's DNS cache data structures
Networking

Cloudflare Saves 100 Terabytes by Optimizing the 1.1.1.1 DNS Cache

Cloudflare redesigned the data structures behind the 1.1.1.1 DNS cache and freed nearly 100 terabytes of memory across its entire fleet. The changes in Rust also improved performance, with higher throughput and lower latency.

By Javier Alarcón, 2 months27 August, 2026 ago
Nvidia and Hugging Face logos representing the Nvidia Hugging Face negotiation
Tech News

Nvidia in Talks to Buy Hugging Face for Over $13 Billion

Nvidia is negotiating to buy Hugging Face for over $13 billion dollars, Business Insider revealed on August 27, 2026. The deal, still unclosed, would give Nvidia control over the central repository of open AI models. Hugging Face had already turned down a smaller Nvidia offer in late 2025.

By Javier Alarcón, 2 months27 August, 2026 ago
DuckDB logo next to the AWS logo illustrating that DuckDB open source remains under the MIT license
Tech News

DuckDB Open Source Will Stay Free Even as DuckLabs Joins AWS

DuckLabs, the company behind DuckDB, will join Amazon Web Services (AWS) in early September 2026. The team will stay in Amsterdam, and DuckDB, DuckLake, and Quack will remain free software under the MIT license, governed by the DuckDB Foundation.

By Javier Alarcón, 2 months26 August, 2026 ago

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El Solitario > Articles by: Javier Alarcón

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