ReactFoo Delhi

On React, performance and front-end engineering

Closing JRACLOUD-68845 - Jira’s journey towards delightful web performance

Submitted by Hannes Obweger (@obweger) on Oct 3, 2019

Duration: 40 mins full talk Status: Confirmed & Scheduled


Over the past few years, technologies such as React and GraphQL have lifted frontend development to a new level; never before have we seen web applications so rich and powerful, all running in the browser. But with great power comes great responsibility: As easy it is to develop rich interactions on the client, as difficult it is to keep these interactions fast and performant. In this talk, we’ll share a number of lessons and techniques that the Jira Cloud team has been applying to get Jira’s new, React-based UI to the level of performance that our customers love and deserve. We’ll discuss how Atlassian thinks and measures web performance, and talk about the impact of JavaScript and CSS bundle sizes, Single Page Application (SPA) architectures, and Server Side Rendering (SSR).


These are the areas I plan to touch on:

  • Overview of Jira’s journey towards a modern, React-based tech stack: Timeline - where did we start, where are we now; from lipsticking, to an inside-out model, to an outside-in model.
  • A primer on web performance at Atlassian: Vertical vs. horizontal scaling; TTR vs. TTI; P50, P90, APDEX.
  • Server Side Rendering (SSR): How it works and why it works; the security implications of SSR; Atlassian’s patented SSR architecture.
  • Single Page Application (SPA) architectures: Full page load vs. SPA transitions; the “network effect” of an SPA and its implications; how to integrate legacy experiences into a fundamentally modern SPA.
  • Education and alignment: How can independent teams and engineers sustainably use a shared, limited resource such as the browser?
  • Up next: What are the upcoming trends and technologies that Atlassian is looking into?

Speaker bio

Hannes is the engineering manager responsible for Jira’s frontend platform, which provides the build and deployment infrastructure, dev tooling, and application architecture for Jira’s new, React-based UI. Today, the frontend platform powers a codebase of more than 1M LoC, with 400 individual contributors in total, and 200 contributors every month.


Preview video


  • Zainab Bawa (@zainabbawa) 7 months ago

    Hello Hannes. Thank for an excellent rehearsal this morning. Recapping the feedback from today’s session:

    1. The flow of the presentation is very good. The problem statement followed by solutions was very well structured.
    2. The inside-outside and inside-in model was very valuable.
    3. The performance measurement can be fleshed since performance is a concern for developers, senior engineers and leaders.
    4. Add at least one slide on the specific model you used for SSR with React. This will be valuable to developers.
    5. Show screenshots of the progression in terms of the JIRA dashboard itself. This will help build relatability among participants.
    6. A big transition has happened in your team from legacy developers to the React stack. There will be people in the audience who will be in a similar boat. Will help to add a slide on the team dynamics on how legacy developers had to switch/transition to React stack. This may not relate to React per se, but will be valuable for the audience.

    Update the link to your slides on this page once you have added the feedback points, by 6 November, latest.

  • Raghavendra Satish Peri (@artofvision) 7 months ago

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