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Category: tutorials

52
Aug 02 2026

Qwen3 locally with Ollama: what changed in the architecture and whether it's worth switching

Qwen3 landed with thinking mode and real improvements in code generation. But before you replace the model already running in your Ollama setup, there are technical questions you need to answer first. I answer them here without selling hype.

Aug 02 2026 · 9′ · Tutorials · TypeScript · Inferencia Local

9′
Jul 29 2026

Prisma Query Logging and PostgreSQL: Where the ORM Ends and the Database Begins

Prisma's query log shows you what SQL the ORM generated, not why that SQL is slow. A practical guide to knowing when logging is enough and when you need to go straight into PostgreSQL.

Jul 29 2026 · 8′ · Tutorials · TypeScript · postgresql

8′
Jul 28 2026

npm Dependencies: How to Evaluate a Library Before It Hits Production

A clean package.json says nothing about who's going to fix that library when it breaks. Practical criteria for evaluating maintenance, surface area, types and transitive deps before adding a dependency to a TypeScript stack.

Jul 28 2026 · 8′ · Tutorials · TypeScript · pnpm

8′
Jul 23 2026

Strict Null Checks in TypeScript: What the Compiler Won't Tell You and Where It Actually Hurts in Production

Compiler says OK. Runtime explodes anyway. Here are the 4 patterns where strict null checks isn't enough: assertion functions, untyped libraries, Prisma ORM, and JSON.parse — with real code from a Next.js/Prisma stack.

Jul 23 2026 · 8′ · Tutorials · Next.js · TypeScript

8′
Jul 22 2026

DeepSeek API in TypeScript: secure integration and honest model evaluation for code

DeepSeek's API is compatible with the OpenAI SDK — that makes the integration almost trivial. The real problem isn't the plumbing. It's deciding whether the model is actually worth it for your use case, without buying the hype or dismissing it out of fashion. Here's the framework.

Jul 22 2026 · 8′ · Tutorials · TypeScript · nextjs

8′
Jul 13 2026

Barman vs pgBackRest: a decision tree for PostgreSQL backup in production

There's no universal winner. Barman wins on simplicity and real-time WAL streaming with low operational overhead. pgBackRest wins on volume and restore speed. The criteria matter more than the tool.

Jul 13 2026 · 9′ · Tutorials · devops · produccion

9′
Jul 07 2026

Rate limiting in web apps: what to protect before picking a library

Rate limiting is not a dependency you drop into middleware and call it done. It's an abuse policy. Before you copy that snippet, you need to define what asset you're protecting, what abuse you're expecting, and what a false positive actually costs you.

Jul 07 2026 · 10′ · Tutorials · TypeScript · nextjs

10′
Jul 06 2026

Spring Boot Actuator: What to Expose, What to Hide, and What to Check Before Adding Endpoints

Actuator isn't the problem. The problem is enabling it without a clear exposure policy. A pragmatic guide to using it as an operational tool without turning it into unnecessary public attack surface.

Jul 06 2026 · 8′ · Tutorials · devops · backend

8′
Jul 05 2026

Next.js App Router Caching: revalidate, dynamic, and no-store Without the Folklore

The problem with Next.js caching isn't memorizing the flags. It's deciding how fresh each piece of data actually needs to be. A guide to reading revalidate, dynamic, and no-store as data contracts, not isolated tricks.

Jul 05 2026 · 8′ · Tutorials · React · TypeScript

8′

Series

  • Open Data and Creativity2
  • Awesome Curated: The Tools10
  • Awesome Curated1
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Clusters

  • Software architecture

Categories

  • Experiments98
  • Tutorials67
  • Opinion42
  • Reflections18
  • Technology8
  • History6

Tags

  • #TypeScript
  • #arquitectura
  • #nextjs
  • #railway
  • #java
  • #LLM
  • #postgresql
  • #ia
  • #prisma
  • #software-architecture
  • #firma-digital
  • #AI

Popular

  1. 01pnpm vs npm vs yarn vs bun: The Real Comparison Nobody Gives You in 2025
  2. 02Next.js App Router: The Guide I Wish I Had When I Migrated from Pages Router
  3. 03TypeScript: The Patterns I Actually Use Every Single Day
  4. 04Docker for Node.js Developers: From Zero to Production Without Losing Your Mind
  5. 05Your Digital Signing Cryptography Has an Expiration Date: What NIST Published and How to Migrate Your HSM

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Juanchi.dev is Juan Torchia’s public notebook — architecture, real systems and product decisions. Written and reviewed by hand in Buenos Aires. Built with Next.js, Prisma and PostgreSQL; deployed on Railway. No third-party trackers beyond aggregate analytics.

GitHubRSS© 2026 Juan Torchia · All rights reserved.

Real code. Unfiltered takes.

Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.

213 articles published

Series

  • Open Data and Creativity2
  • Awesome Curated: The Tools10
  • Awesome Curated1
See all

Clusters

  • Software architecture

Categories

  • Experiments98
  • Tutorials67
  • Opinion42
  • Reflections18
  • Technology8
  • History6

Tags

  • #TypeScript
  • #arquitectura
  • #nextjs
  • #railway
  • #java
  • #LLM
  • #postgresql
  • #ia
  • #prisma
  • #software-architecture
  • #firma-digital
  • #AI

Popular

  1. 01pnpm vs npm vs yarn vs bun: The Real Comparison Nobody Gives You in 2025
  2. 02Next.js App Router: The Guide I Wish I Had When I Migrated from Pages Router
  3. 03TypeScript: The Patterns I Actually Use Every Single Day
  4. 04Docker for Node.js Developers: From Zero to Production Without Losing Your Mind
  5. 05Your Digital Signing Cryptography Has an Expiration Date: What NIST Published and How to Migrate Your HSM

Newsletter

One email a week. What I'm learning, building, and breaking.

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