Engineers will do anything to avoid learning from history

I Built a Production Job Scraper in 4 Days — Here's What I Learned

I spent the last 4 days building a multi-site job scraper. Not a toy project — an actual production tool that runs on Apify and works reliably. This is what I learned.

• I built a multi-site job scraper in 4 days using Apify, Playwright, and Node.js
• Scraper retrieves and processes over 1,900 IT jobs in 8 minutes at $0.13 cost
• Lessons learned: prioritize output format, error handling, and comprehensive documentation

20h ago ·dev.to

RESTful APIs

First, what is the difference between RESTful APIs and REST APIs? REST API: Used for simple projects and doesn't require a complex system.

• RESTful APIs differ from REST APIs in complexity and application scope.
• RESTful APIs strictly follow REST principles using HTTP methods like GET, POST, PUT, DELETE.
• JSON is preferred for RESTful APIs due to its machine and human readability.

20h ago ·dev.to

Retry budgets by language: Python, Go, and JavaScript

Originally published on Loop & Retry — field notes on building LLM agents that survive production. The retry-budget argument is language-independent: your retry multiplier is set by how you recover…

• Python uses decorator for retry logic, leading to per-call caps
• Go makes retry logic explicit with shared RetryBudget in context
• Both languages require lock for shared state to avoid race conditions

20h ago ·dev.to

"Power BI Error: The Key Didn't Match Any Rows in the Table"

tags: powerbi, dax, troubleshooting, tutorial canonical_url: https://pbidocs.com/blog/key-didnt-match-any-rows-error The full error reads: The key didn't match any rows in the table This is the…

19h ago ·dev.to

Building a Responsible Health Calculator Portal for Everyday Use

Health calculations are useful only when people understand what the numbers mean and what they cannot tell them. That principle guided the development of Quantas Calorias, a free web portal that…

• Quantas Calorias consolidates 9 health calculators into user-friendly portal
• Each result is estimate, not diagnosis, must be interpreted with medical history
• Portal aims to educate, not diagnose or prescribe medical treatments

19h ago ·dev.to

The Matrix of Tree Traversals: Recursive vs Iterative Explained

The Quest Begins (The "Why") I still remember the first time I was asked to validate a binary search tree in an interview. My brain went into panic mode: “Do I write recursion?

• Recursion in tree traversals follows a "visit left, node, right" pattern.
• Iterative approach uses an explicit stack to mimic recursive call stack.
• Iterative method avoids recursion depth limits and stack overflow issues.

19h ago ·dev.to