JSFoo 2017

JSFoo is a conference about JavaScript and everything related.

About the conference: JSFoo is a JavaScript conference hosted by HasGeek.

Theme this year: The broad theme this year is going to be Building Reliable Web Apps. Please refer to the Topics section below for the subject of talks and workshops we are looking for.

We are inviting proposals for:
Full-length 40 minute talks.
Crisp 15 minute talks.
Sponsored sessions, of 15 minutes and 40 minutes duration (limited slots available; subject to editorial scrutiny and approval).
Hands-on Workshop sessions, 3 and 6 hour duration.

##Selection process
Proposals will be filtered and shortlisted by an Editorial Panel. Please make sure to add links to videos / slide decks when submitting proposals. This will help us understand your speaking experience and delivery style. Blurbs or blog posts covering the relevance of a particular problem statement and how it is tackled will help the Editorial Panel better judge your proposals. We might contact you to ask if you’d like to repost your content on the official conference blog.

We expect you to submit an outline of your proposed talk – either in the form of a mind map or a text document or draft slides within two weeks of submitting your proposal.

Selection Process Flowchart

You can check back on this page for the status of your proposal. We will notify you if we either move your proposal to the next round or if we reject it. Selected speakers must participate in one or two rounds of rehearsals before the conference. This is mandatory and helps you to prepare well for the conference.

A speaker is NOT confirmed a slot unless we explicitly mention so in an email or over any other medium of communication.

There is only one speaker per session. Entry is free for selected speakers. As our budget is limited, we prefer speakers from locations closer home, but will do our best to cover for anyone exceptional. HasGeek provides these limited grants where applicable: two international travel and accommodation grants, three domestic travel and accommodation grants. Grants are limited and made available to speakers delivering full sessions (40 minutes or longer). Speaker travel grants will be given in order of preference to students, women, persons of non-binary genders, and individuals for Asia and Africa first.

Updated (19 April 2017): We are currently looking for talks in the following topics:

Testing: Testing tools and strategies; test driven development and testing culture; continuous integration and testing workflows; and case studies around testing your application.

Performance optimization: Performance analysis tools and techniques; best practices for building performant applications; browser, NodeJS, and framework internals; network protocols; and performance case studies.

Debugging: Tools for locating and fixing bugs in JavaScript applications; real world post-mortems of bugs that affected your organization; and using telemetry for debugging.

Immutability, type checking, and alternative programming languages: Alternatives to vanilla JavaScript; functional programming and immutability; types and type systems; and real-world case studies of introducing alternative programming languages and tools in your organization.

Build tooling: Build tools and automation, including task runners, linters, JavaScript bundlers, CSS pre- and post-processors, continuous integration tools, static analysis tools, and optimization tools.

Crash and performance monitoring: Monitoring applications for crashes and performance issues while in production.

##Commitment to open source
HasGeek believes in open source as the binding force of our community. If you are describing a codebase for developers to work with, we’d like for it to be available under a permissive open source licence. If your software is commercially licensed or available under a combination of commercial and restrictive open source licences (such as the various forms of the GPL), please consider picking up a sponsorship. We recognise that there are valid reasons for commercial licensing, but ask that you support us in return for giving you an audience. Your session will be marked on the schedule as a “sponsored session”.

##Important dates
Deadline for submitting proposals: 15 June 2017

**Conference dates: ** 15–16 September 2017

For more information about speaking proposals, tickets and sponsorships, contact info@hasgeek.com or call +91 76763 32020.

Note: We aren’t accepting any new talks.

Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more

JUSPAY Technologies Pvt Ltd


10x Faster Mobile App Dev with PureScript

Submitted Sep 8, 2017

At Juspay, after spending a few years writing various payments applications, we found
ourselves looking for a better way. We wanted to allow newcomer developers, designers and
project managers to be able to jump in and start creating solutions to their problems, without
jumping through the hoops created by the language and tools.

As a JavaScript house, we explored a number of options and chose PureScript as our core
language. It paired the conciseness of Haskell with the ubiquity of the JavaScript interpreter,
allowing us to make a staged transition. We modeled the UI components and business flows as
simple, pure functions that are reusable across apps. The frontend and backend were naturally
unified, and could be represented as a continuation of flow between the client and server.

In the last several months, we have made major strides towards allowing everyone in our
company to be able to examine and write code for the apps we are building. We have trained
around 100 interns on Haskell and PureScript to work on our platform in production. We have
been able to deploy this framework into production in mission critical payment and banking

In this talk, we will talk a bit about the framework we have built, and then dive into our rationale
for choosing PureScript as our language, our experiences in transitioning from JavaScript to
PureScript, and what we have learned along the way.


  1. Speaker Intro
  2. Problem: commercial apps take millions of $$ to maintain
  3. Why are apps hard?
  4. How does Presto solve this problem?
  5. How1: Presto’s UX DSL
  6. How2: Business Flows as Composable Goal Tree & Code Walkthrough
  7. How3: The choice of a Pure FP language
  8. How4: Architecture unification to just 3 building blocks
  9. Why was PureScript chosen? Why use CPS architecture?
  10. How does this add up to 10x?
  11. Example Apps in production
  12. Next Steps



Speaker bio

Vimal Kumar, CEO Juspay
We have built and maintained multiple large scale payments apps (eg. BHIM), with a young team. Our learnings over the last few years helped us build Presto.




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Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more