Dan Neciu’s Post

Good post on concurrent promises in JS. Just watch yourself with Promise.all. The function short-circuits the results on failure. Until you understand what that means, allSettled is a safer alternative.

𝐇𝐨𝐰 𝐰𝐞 𝐬𝐩𝐞𝐝 𝐮𝐩 𝐨𝐮𝐫 𝐂𝐈/𝐂𝐃 𝐭𝐞𝐬𝐭 𝐫𝐮𝐧𝐬 𝐟𝐫𝐨𝐦 18 𝐦𝐢𝐧𝐮𝐭𝐞𝐬 𝐭𝐨 4 — 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐬𝐚𝐜𝐫𝐢𝐟𝐢𝐜𝐢𝐧𝐠 𝐜𝐨𝐯𝐞𝐫𝐚𝐠𝐞 Our pipeline was slow. Developers started merging before tests finished. Not great. This is what we did ???? 1️⃣ 𝐉𝐞𝐬𝐭 𝐟𝐨𝐫 𝐚𝐥𝐥 𝐜𝐨𝐦𝐦𝐢𝐭, 𝐏𝐥𝐚𝐲𝐰𝐫𝐢𝐠𝐡𝐭 𝐟𝐨𝐫 𝐏𝐑𝐬 Unit tests are fast and catch 80% of bugs. E2E tests are slow and catch the scary ones. Don't treat them equally. 2️⃣ 𝐄𝐯𝐞𝐫𝐲𝐭𝐡𝐢𝐧𝐠 𝐢𝐧 𝐩𝐚𝐫𝐚𝐥𝐥𝐞𝐥 Frontend, backend, and E2E streams all run in parallel. Most teams still execute sequentially because it's the default. 3️⃣ 𝐂𝐚𝐜𝐡𝐞 𝐚𝐠𝐠𝐫𝐞𝐬𝐬𝐢𝐯𝐞𝐥𝐲 Re-use node modules and build artifacts between runs. We saved about a minute per suite, small wins that add up. 4️⃣ 𝐒𝐦𝐨𝐤𝐞 𝐭𝐞𝐬𝐭𝐬 𝐝𝐞𝐩𝐥𝐨𝐲 𝐟𝐢𝐫𝐬𝐭 Critical user flows (login, checkout, core APIs) run immediately after deploy. Full E2E runs asynchronously later. 5️⃣ 𝐃𝐚𝐬𝐡𝐛𝐨𝐚𝐫𝐝𝐬, 𝐧𝐨𝐭 𝐒𝐥𝐚𝐜𝐤 𝐬𝐩𝐚𝐦 We built a simple report page. Devs actually look at it because it shows trends, not just red or green. The goal isn’t perfect coverage, it’s making tests fast enough that people actually run them. 💬 What's your CI time like now? If it's longer than 10 minutes, something's probably misconfigured. #springboot #reactjs #playwright #jest #testing #devops #tdd #softwareengineering #nextjs #nodejs #cicd #fullstack

🔍A Clearer Look at How Different APIs Work Lately I’ve been digging deeper into how different types of APIs function beneath the surface, not just how we consume them on the frontend. REST, SOAP, GraphQL, WebSockets, gRPC — each one solves a different problem, and understanding those differences makes integrations way smoother. I put together a simple, easy-to-follow breakdown that focuses on the core ideas without the usual jargon. 📦github.com/samarjeets10 🐦x.com/SamarjeetSabale If you’re strengthening your fundamentals, this perspective might help you connect things more quickly. 🚀 #WebDevelopment #FrontendDev #APIs #LearningInPublic #SoftwareEngineering #DeveloperCommunity #TechLearning

If you're still building monoliths, you're missing out. Modern development requires speed, flexibility, and clear separation of concerns. That's why building a dedicated, robust Django API is non-negotiable. It allows front-end teams (React, Vue, mobile) to work completely independently from the backend, drastically speeding up delivery and maintenance. Django gives you the security and features; DRF gives you the structure. We rely on Django REST Framework to power our microservices, and it's been a game-changer for scalability. #remote #Microservices #Scalability #TechStack #DjangoDevelopers #APIdesign

Clock Skew: The Invisible Bug Breaking Your Auth Without You Realizing If you want to watch a backend system quietly self-destruct, just let the clocks drift. Clock skew is the tiny difference in time between your browser, your API server, your database, your auth provider and every other moving part in your stack. Harmless? Not at all. It is the silent troublemaker behind some of the most confusing bugs developers face. Think of it like scheduling a meeting for 10:00 AM: Your watch says 9:58. Someone else’s says 10:03. Another says 9:55. Suddenly, everyone is showing up at different times even though the meeting time was clear. Distributed systems behave exactly the same way when clocks disagree. Here is what clock skew actually breaks: - JWTs start acting strange. They show up as expired, not yet valid, or mysteriously issued in the future. - OAuth and signed requests like AWS SIGv4 or PKCE stop trusting you because the timestamps are off. - Caches get confused, serving stale data or invalidating things way too early. - Logs, chat messages and notifications appear out of order, leaving you wondering if your system invented time travel. - Cron jobs, CI pipelines, deployments and containers fire at the wrong moment. - React timers and countdowns jump around because the client’s clock is living in its own reality. - Worst of all, the bug might only happen for users with incorrect device clocks, making debugging feel like chasing a ghost. How to fight back: - Make sure every server uses NTP sync. No exceptions. - Give your JWT validation a small clock tolerance in NestJS to avoid false failures. - In React, rely on server time instead of trusting the client clock. Clients lie. A lot. A perfectly synchronized system will never exist, but a well-behaved one has a single source of truth and enough tolerance to handle drift. #backend #fullstack #solutionarchitecture #softwareengineering #javascript #nestjs #react #devops #cloud #architecture

It Works on My Machine” - The Developer Trap We’ve all been there Everything works perfectly on your local setup Then you deploy and boom nothing works. Different environments. Different configs. Missing .env variables. And a little too much “it worked locally.” Here’s the truth local success ≠ production success. A few habits that save hours (and reputation): ✅ Test with staging environments before deploying. ✅ Use Docker or containers for consistent environments. ✅ Automate CI/CD pipelines to catch config or version mismatches early. ✅ Always double-check your .env and .gitignore. Because the fewer surprises in production, the better your sleep. 👉 What’s your best trick to prevent the classic “works on my machine” disaster? #WebDevelopment #ReactJS #Nextjs #FrontendEngineer #SoftwareEngineering #DevOps #CodingTips #DeveloperMindset #CICD #CleanCode #WebDev

🚀 Node.js keeps evolving — here’s what’s hot right now If you’re still running an old Node version, you’re missing out on serious performance and dev-experience upgrades. Here are the highlights from the latest releases (v20+ / v22): ⚙️ Native --watch mode – auto-restarts on file changes, no need for Nodemon. 🔌 Built-in WebSocket client – no external library required for real-time apps. ⚡ Faster V8 engine (v12.4) – better memory management and startup times. 🔒 Upgraded TLS & OpenSSL – stronger security for production workloads. 📦 Improved ESM support – smoother module interoperability. 🧠 Higher stream throughput – boosted default buffer sizes for heavy I/O tasks. 💡 Why it matters: Less boilerplate, fewer dependencies, and faster, more secure APIs. Node.js keeps proving it’s not just “JavaScript on the backend” — it’s a modern runtime built for scale. #NodeJS #JavaScript #BackendDevelopment #FullStack #WebDev #TechUpdate #Performance #Developers

⚡ Understanding Promises and Async/Await Before Promises, developers used callbacks to handle asynchronous tasks. But callbacks inside callbacks (a.k.a callback hell) quickly made code unreadable. Promises changed that. A Promise represents a value that might be available now, later, or never. It has three states — pending, fulfilled, or rejected. Here’s a simple example: const fetchData = new Promise((resolve, reject) => { setTimeout(() => { const success = true; success ? resolve("Data fetched successfully!") : reject("Error fetching data!"); }, 1000); }); fetchData .then((res) => console.log(res)) .catch((err) => console.error(err)) .finally(() => console.log("Operation complete.")); The .then() handles success, .catch() handles failure, and .finally() runs no matter what. Promises make your async logic predictable — but Async/Await makes it beautifully simple. With Async/Await, you can write asynchronous code that looks like synchronous code. It’s just syntactic sugar built on top of Promises, but it’s so much easier to read: async function getData() { try { const res = await fetchData; console.log(res); } catch (err) { console.error(err); } finally { console.log("Operation complete."); } } getData(); The await keyword pauses the execution of the function until the Promise resolves or rejects — without blocking the main thread. It’s like saying: “Wait here until this task is done, then continue.” Once you understand Promises and Async/Await, you’ll never fear async code again. You’ll write APIs, handle responses, and control flow like a pro. 💪 It’s not just about syntax — it’s about writing code that reads like logic, not like spaghetti. #JavaScript #AsyncAwait #Promises #WebDevelopment #NodeJS #ReactJS #Frontend #MERNStack #CodingCommunity #LearnInPublic #100DaysOfCode #DevCommunity

You can do anything with an axe — but it’s wiser to pick the right tool for the job. REST, GraphQL, gRPC, WebSockets, Webhooks, SSE — every API style works… until it doesn’t. Here’s a practical guide to choosing the right one for your next project.

When you’re building a single service, Express feels effortless minimal setup, total control. But once your system grows into multiple moving parts, that freedom starts to cost you structure. That’s where NestJS shines. Designed with modularity, dependency injection, and TypeScript at its core, NestJS provides the structure large, distributed systems need. Its microservices package supports communication over Kafka, RabbitMQ, Redis, MQTT, and more out of the box. Each module can scale independently, integrate cleanly, and stay consistent across teams. That’s why many companies use NestJS to build event-driven or microservice-based architectures that remain maintainable over time. When you move from a single service to a distributed system, NestJS doesn’t just simplify, it scales with you. #software #fullstack #javascript #nodejs #express #nestjs #softwarearchitecture #systemdesign #microservice #framework