Give me a quick overview of identifying client browsers please!

Milk and cookies
Milk and cookies
Cookies, sessions and JWT tokens

In this article we will be referring exclusively to HTTP cookies, and so all references to ‘cookie’ will be within this context.

Audience

This article is aimed at developers with a minimal understanding of HTTP. It looks to clarify some basic questions surrounding cookies, sessions and JWT, finishing with a worked example using Express.js.

Argument

Within this article we will explore the definition of a cookie, what they contain and how they are related to sessions and JWT tokens. We will then work through these concepts using an example.

Cookies are simply…


What is CQRS, and why and how do we use it?

Laptop by whiteboard
Laptop by whiteboard

Audience

This article is aimed towards anyone with a basic understanding of application architectures. It requires some knowledge of how applications and data stores fit together, as well as a superficial knowledge of AWS.

It looks to address the following points:

  • What is Command Query Responsibility Segregation (CQRS)?
  • When and why do we use it?
  • What is Event Sourcing, and why is it commonly used with CQRS?
  • How might these ideas be implemented in an AWS environment?

All of these points will be covered in the context of adding a…


As an engineer, how can I practice my secure coding?

Laptop half closed
Laptop half closed
A brief overview of tools for examining application security

Audience

This article is aimed at developers who would like to improve their security skills. It assumes a basic knowledge of at least one programming language and a reasonable understanding of web applications.

Security is an important area of expertise for a developer. However, it is often difficult to know where to begin your learning. In this article we aim to cover a number of tools which can be used to start your journey.

Argument

We will cover two main resources for learning about security:

We…


So, what have I missed?

Java code on a computer screen
Java code on a computer screen

Audience

This article is aimed at developers with a basic understanding of Java but who are looking to brush up on the changes from version 8 onwards. It isn’t intended as an in-depth guide, but more as a summary to remind you of the more exciting new features.

Argument

We will start with the changes to the Java release cycle, then move on to the key additions to each new version.

Previously Java would leave years between versions, finessing all of the features it hoped to introduce before doing a big bang release. Since Java 8, this…


I understand certificates, or at least I think I do…

Hacker at his desk
Hacker at his desk

Audience and Aim

This article is for developers who are currently using certificates and want to concrete their practical knowledge. We won’t dive deeply into details, but will give a pragmatic overview of the different areas required for their understanding.

Please note, this article does assume you have a basic understanding of public and private key infrastructure!

We aim to answer the below questions:

  • What is a certificate for?
  • How do I get a certificate?
  • What is a certificate authority?
  • What is in a certificate?
  • How do I use a certificate?
  • How does…


I’m a developer, I deploy to a VPC, but what’s going on in there…

Man thinking at his computer
Man thinking at his computer

Audience and Aim

This article is aimed at developers using AWS looking to understand how VPCs work. In many companies the complex infrastructure provisioning is separated from the development process. You may be deploying into a VPC, but not really know where your code is going.

Here we will explain at a very high level how a VPC functions. We will assume a small amount of networking knowledge, but the idea is to make the explanation as clear and practical as possible.

Argument


My AWS Step Function is exhausting my Lambda pool and keeps falling over!

Woman frustrated at computer
Woman frustrated at computer

Audience and Aim

The audience for this article is anyone using AWS Step Functions directly calling AWS Lambdas. An issue with particularly high traffic systems involves exhausting the Lambda pool, which in turn causes the Step Function to fail. The article expects a reasonable familiarity with both components.

At the time of writing the maximum open Step Function executions per account is 1,000,000. However, the default number of concurrent Lambda executions you may have per account is 1,000. …


Everyone keeps talking about it, but what the hell is it?

Woman standing by computer servers
Woman standing by computer servers

Audience and Aim

This article is aimed at any engineer who has heard of the concept of Infrastructure as Code/ Terraform and has at least a familiarity with AWS.

We aim to answer the following questions:

  • What is Infrastructure as Code?
  • What is Terraform?
  • How do we use Terraform?

The final section will walk through an example where we generate our own S3 bucket in AWS by utilising the Terraform module and workspace functionalities.

Argument

Infrastructure as Code (IaC) is one of the key DevOps practices and relates to the management of infrastructure…


I’m a developer, I’m doing Scrum and I’m not sure it’s working for me!

Man frustrated at laptop
Man frustrated at laptop

Audience and Aim

This article is for people in a Scrum development team who are feeling any of the below frustrations:

  1. ‘All of my non-functional requirements are being de-prioritised.’
  2. ‘I’m being made to code features whose functional design I don’t agree with.’
  3. ‘My stakeholders are demanding late, unrealistic changes, citing Scrum being an Agile process as validation!’

There are of course other issues you may be facing, but this article focuses on these three specifically, and how you can alleviate them using the Scrum framework.

It assumes a functional…

James Collerton

Senior Software Engineer at the BBC

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store