Level Up Coding @LevelUpCoding_

If you’re serious about learning agentic AI, here’s a practical pathway I’ve found highly effective: I’ve been diving deeper into how to build multi-agent systems. A lot of courses out there are shallow in coverage. To build real AI agents, you need more than just tool usage…

Postman and AI are no longer adjacent tools, they’ve evolved into fully integrated solutions. AI is most useful when it’s grounded in your real workflows. That’s why AI requests in collections is a big deal. Instead of running experiments in isolation, you can call models…

Things Every Developer Should Know — SQL Execution Order. A SQL query executes its statements in the following order: 1) FROM / JOIN 2) WHERE 3) GROUP BY 4) HAVING 5) SELECT 6) DISTINCT 7) ORDER BY 8) LIMIT / OFFSET 𝗧𝗵𝗲 𝘁𝗲𝗰𝗵𝗻𝗶𝗾𝘂𝗲𝘀 𝘆𝗼𝘂 𝗶𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁 𝗮𝘁…

SQL, NoSQL, or something else — how do you decide which database? Going back on a bad database choice can be time-consuming and expensive. Before we dive into the factors to take into account when choosing an appropriate database, let’s examine the characteristics of the most…

HTTP 2 vs HTTP 3 — What's the Difference? • 1996 → HTTP 1 • 1997 → HTTP 1.1 • 2015 → HTTP 2 • 2022 → HTTP 3 But what’s the difference? Starting at the foundation: 🔹 𝗛𝗧𝗧𝗣 𝟭.𝟭: ✓ 𝗣𝗲𝗿𝘀𝗶𝘀𝘁𝗲𝗻𝘁 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻𝘀 — Reuses connections instead of…

AI is making code reviews faster (and better). Here’s how: Without AI, by the time a PR is reviewed, the engineer has often moved on. Context is cold. Iteration is slow. That's why CodeRabbit provided not just code reviews in pull requests, but in the IDE. They've just taken…

10 Must-know best practices for optimizing API endpoints: • Pagination ↳ Break large datasets into smaller chunks with tools like limit and offset parameters. This improves performance and avoids crashing clients with oversized responses. Combine with cursors for better…

If I had to automate workflows, here's an approach I'd consider: An IDE agent has access to your code. A CLI agent has access to your workflows. That’s because CLI AI agents aren’t bound to your editor. Instead they plug into your stack. They can respond to events from…

API Gateway vs Load Balancer — What's the Difference? An 𝗔𝗣𝗜 𝗚𝗮𝘁𝗲𝘄𝗮𝘆 acts as a single entry point for clients, handling request routing, composition, and protocol translation. It simplifies client interactions with microservices and offers features like rate limiting,…

Concepts every developer should know: concurrency is 𝗡𝗢𝗧 parallelism. Parallelism and concurrency are two terms that often create confusion. One is about managing multiple tasks at once, intermixing them to optimize resource usage. The other involves executing multiple…

Stateful vs Stateless Design — What's the Difference? Stateless design is a powerful model that has led to the development of simple yet highly scalable and efficient applications. “State” refers to stored information that systems use to process requests. This information can…

How Does SSH Work? What actually happens when you type ssh user@host? The visual below lays out the sequential steps that occur between the SSH client and the SSH server. Here’s a breakdown of the main events that occur during an SSH connection: 𝟭) 𝗞𝗲𝘆 𝗲𝘅𝗰𝗵𝗮𝗻𝗴𝗲…

If you want to become good at code reviews, here are some techniques to consider: Most PR reviews fail when they focus on nitpicks, formatting, and style, while the real issues slip through. That’s the cost of reviews without context. They slow teams down instead of helping…

How API Gateways work (explained in 2 mins or less): An API gateway acts as a single entry point for clients. It simplifies client interactions with microservices. To understand how an API gateway works, let's look at how it processes a request: 𝟭) 𝗜𝗻𝗶𝘁𝗶𝗮𝗹…

Kafka vs AutoMQ — What's the difference? Kafka operates as a distributed pub-sub messaging system. Allowing applications to publish and subscribe to real-time data feeds. Its strengths? High throughput, scalability, fault-tolerance, and a mature ecosystem. But Kafka is also…

The Main Components of Docker Explained. Docker solves the "it worked on my machine" problem. It has a handful of core components. By understanding them you will have a strong fundamental understanding: 𝗜𝗺𝗮𝗴𝗲𝘀 ↳ Read-only templates that are used to build containers.…

🚨BREAKING: Kafka can now stream directly into Iceberg tables (zero ETL, zero copies). Until now, proprietary vendor solutions dominated this space, locking teams into closed ecosystems. But with Aiven’s open-source contribution, the playing field changes. Here’s why it…

The Main Components of Kubernetes Explained. At its core, Kubernetes is built on a handful of key components, each with a distinct role. By understanding them, you'll have a strong foundational understanding. 𝗡𝗼𝗱𝗲: ↳ Machines (physical or virtual) that run containerized…

How do we design effective and safe APIs? To understand some of the key principles and best practices of API design, Let's analyze a social media platform example: • 𝗥𝗲𝘀𝗼𝘂𝗿𝗰𝗲 𝗻𝗮𝗺𝗶𝗻𝗴 ↳ Clarity is key when creating APIs. Adopting simple resource names, like /users…

Well-structured prompt = working app. For complex systems, far from it. But for simpler apps, things have gotten this fast. Plan. Prompt. Build. Refine. This has become an increasingly viable option for building applications. When it comes to prototyping or building simpler…