![]() ![]() Looking at the diagram above you can see how complex even a fairly simple application might be once you are deploying it to handle real workloads.Ī DevOps engineer might handle these things: What does a DevOps Engineer do?ĭevOps is a set of skills or practices that combine software development and operations. If the main database server fails, there are backup copies that can immediately step in and handle the traffic. Again, the idea here is both to handle traffic and allow some redundancy int the system. In this diagram you have multiple copies of your backend code running, and multiple instances of your database running in something known as a cluster. It might look like this:Ī Load Balancer is a system that takes requests from clients and routes is back to multiple server to evenly distribute load. But what does the infrastructure look like? Well when you deploy an application you will make it so that the system can handle the amount of traffic you expect and has some built in redundancy.įor example, what if your server crashes? Well, normally you deploy multiple copies of your application server behind something called a Load Balancer so that if one server crashes it will not take down your whole site. The diagram above is simply a diagram of the technology involved. Same app but now we look at infrastructure. I'll go over those in upcoming blog posts. This architecture is often referred to as a simple "monolith", as opposed to newer style of either microservice architecture or serverless architecture. This is where the data for the application will be stored. It might be on the same server (remote computer) as the Node.js code, or it might be on another one. The MongoDB database is also a server running in a data center. This code will respond to requests from the user initiated by the client side code and handle saving and retrieving data from the database. The server side code is written in Node.js and is running off in a datacenter somewhere. This is the code that causes the application UI to display in your browser and handles input from the user. The client is written in React and is downloaded onto your phone or computer when you visit the site. It is a common web development stack that covers most of the technology involved in building an application. You have probably heard of MEAN (MongoDB, Express, AngularJS, Node.js) or MERN (just swap Angular with React). The server side of the application might be in any backend language and the Backend Engineer will be working on this.Īnother helpful post to read at this point might be this one where I explain frontend vs backend, if you haven't read it yet! A simple MEAN / MERN Stack Application This is what the Frontend Engineer works on. The client side of a web application is HTML, CSS and JavaScript. To be clear, a server is just a computer in a data center or cloud service. You have clients (which would be a computer or a phone) connecting through the internet to a server in a data center. Most applications operate under what can generally be termed the Client Server Model. Do you understand how all of these pieces fit together? At what point in a project are these people needed?Ĭan you anticipate the needs of your client and who they will need to hire next for the upcoming lifecycle of a software project? Client Server Model. When hiring software engineers it helps to understand what a working web application looks like because you can better see where different roles fit into the project.įor example you may be hiring for Frontend Engineers, Backend Engineers, DevOps Engineers, Cloud Architects, or even Database Administrators.
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