ferrerallan 
Flask routes work until they stop working, usually at the worst possible time. Unit tests catch regressions before they reach production. Flask has a built-in test client that makes testing routes clean without spinning up a real server. TL;DR: Write unit tests for Flask applications using the built-in test client: test routes, request handling, and … Read more
You deployed a smart contract and want to read its state or call functions from a web app. Web3.js with MetaMask gives you a browser-based connection to any deployed contract using its ABI and address. TL;DR: Connect to a deployed smart contract on Sepolia from a browser using Web3.js and MetaMask.Stack: Web3.js, MetaMask, Solidity, Sepolia, … Read more
You need test ETH to deploy and interact with smart contracts on Sepolia. The process is straightforward once you know which faucet to use. TL;DR: Get Sepolia testnet tokens from the Chainlink faucet to deploy and test Ethereum smart contracts.Stack: Ethereum, Sepolia testnet, Chainlink faucetLevel: BeginnerReading time: ~2 min Go to https://faucets.chain.link/sepolia, connect your wallet, … Read more
Testing your contract on a local Hardhat network is fine during development. When you’re ready for the real testnet, you need real accounts, real ETH (testnet ETH), and a node provider like Infura to broadcast your transactions. TL;DR: Deploy a Solidity smart contract to Sepolia testnet using Hardhat and Infura.Stack: Hardhat, Solidity, Infura, Sepolia, dotenvLevel: … Read more
You deployed your Flask app to EC2 and everything works. Then the instance restarts after a maintenance event and the app doesn’t come back up. The fix is a systemd service: it tells Linux to start your app automatically on every boot, restart it if it crashes, and manage logs through journald. TL;DR: Create a … Read more
Your Django REST API works, but there is no documentation. Every new developer has to read the source code to understand the endpoints. drf-yasg generates interactive Swagger and ReDoc docs automatically from your views and serializers. TL;DR: Add Swagger and ReDoc interactive documentation to a Django REST Framework API using drf-yasg.Stack: Python, Django, Django REST … Read more
Your dev RDS instance and ECS services run 24/7, including weekends when nobody is using them. That is money leaving your account for no reason. A Lambda function on an EventBridge schedule can stop them on Friday night and restart them Monday morning with zero intervention. TL;DR: Use AWS Lambda + EventBridge cron schedules to … Read more
Your team is already in Slack. Instead of building separate dashboards or notification systems, a Slack bot can deliver alerts, respond to commands, and surface important events right where your team works. TL;DR: Create a Slack bot using the official API, configure permissions, get a token, and send messages programmatically.Stack: Slack API, Slack Bot TokenLevel: … Read more
Building a DRF endpoint that accepts Excel uploads and returns a processed Excel file requires handling multipart form data, reading it with pandas, transforming it, and streaming the output file back in the response. Each of those steps has its own failure mode. TL;DR: Build a Django REST Framework API that accepts an Excel file … Read more
You need Windows for a specific tool but don’t want to dual-boot or buy a second machine. KVM/QEMU on Linux gives you a full Windows VM with near-native performance, clipboard sharing, and shared storage between host and guest. TL;DR: Install KVM/QEMU on Linux, set up virt-manager, create a Windows VM, configure video and display with … Read more