There’s no doubt that front-end development will be one of the hottest disciplines in tech in 2020

Entire project served on a CDN

Because no server is needed, the whole project can be served from a CDN, unlocking speed and performance that can’t be beat.

Everything lives in Git

Everyone should be able to clone the whole project from a Git repo without the need for a database or a complex setup.

Automated builds

You can automated builds perfectly because all of the markup is prebuilt — for example, with webhooks or cloud services.

Atomic deploys

In order to avoid inconsistent states by redeploying hundred or thousands of files in large projects, atomic deploys wait for all files to be uploaded before changes go live.

Instant cache invalidation

When a site goes live, you must make sure your CDN can handle instant cache purges for changes to become visible.
Well known hosters, like Netlify or Zeit, support JAMstack applications, and large corporations use them to deliver great experiences to their users.
It’s definitely something you want to get your head around as a front-end developer in 2020. If you want to learn more about JAMstacks, here are some great resources:

• 
  JAMstack
  
• 
  JAMstack WTF
  
• 
  “New to JAMstack? Everything You Need to Know to Get Started”
  

4. PWA

Progressive web apps (PWA) will definitely be a thing in 2020. More and more companies are choosing PWAs over native apps to offer rich mobile experiences to their users.
PWAs are reliable (instant loading, work without internet connection), fast (smooth animations, quick responses to user interaction), and engaging (native-app feeling, great user experience).
They make use of service workers for offline functionality and a web-app manifest file for a full-screen experience.
Reasons for building a progressive web app are, for example:

• 
  Can be added to a user’s home screen from the browser
  
• 
  Work even if there isn’t an internet connection
  
• 
  Support web push notifications for enhanced user engagement
  
• 
  Make use of Google’s Lighthouse features
  

If you want to learn more about PWAs, feel free to check out these additional resources:

• 
  Progressive Web Apps
  
• 
  “Your First Progressive Web App”