In this document, you can find a list of ideas that are proposed by the Scala Organisation for Google Summer of Code 2024.

Application

If you are interested in becoming a contributor on any idea, please reach out to your potential mentor using their email address specified with the project. You can also reach Scala Center at scala.center(at)epfl.ch.

If you would like to be a mentor and propose your own idea, please submit a PR editing this file (e.g. see 2023's projects), adding your project to the list, following the format of other projects below.

Rules

You can read the full rules of the program at the following links: Rules, Terms and Conditions, Help.

And here are the requirements for the potential contributor's proposal: Writing a proposal.

However, here are some rules that we'd like to emphacise since they are not visible enough at the above links:

• The program is geared towards beginners first and foremost. It is intended to be a learning experience for people at the very beginning of their careers. It is also intended to give an opportunity to people who would otherwise not have one. It is NOT a freelance job. Therefore, when making an acceptance decision on a potential contributor, we will prioritize disadvantaged backgrounds and contributors at the very beginning of their careers.
• IMPORTANT - EPFL Students: Please note that, according to GSoC rules, there are restrictions on accepting students from an organization's host university. For Scala Center, the host university is EPFL. We can only accept up to 1 student from EPFL, so please take it into account if you're studying at EPFL and consider applying.

Project Ideas

Doodle Canvas

Title	Doodle Canvas
Link to Project	https://github.com/creativescala/doodle/
Brief Description	Doodle is a library for 2D graphics. It has good support for producing structured images, but sometimes you just want to blast pixels onto a screen. This project aims to add support for that.
Expected Outcome	A Doodle algebra or algebras that support writing pixels, and probably lines, circles, and other shapes, directly onto the screen.
Prerequisites	Basic Scala knowledge
Ideal Prerequisites	Some understanding on tagless final style.
Expected Difficulty	Easy – straightforward task, path for execution visible right now, very little uncertainty
Expected Time Commitment	Medium project – 175 hours
Mentor	Noel Welsh (GitHub: @noelwelsh, Email: noel@noelwelsh.com)
Co-mentor

Doodle Bitmap Convolutions

Title	Doodle Bitmap Convolutions
Link to Project	creativescala/doodle#94
Brief Description	Add support for bitmap convolutions to Doodle. The link has more, including a Github project laying out the steps.
Expected Outcome	Working code and documentation.
Prerequisites	Some Scala knowledge.
Ideal Prerequisites	Basic knowledge of bitmap convolutions, some understanding of tagless final.
Expected Difficulty	Easy – straightforward task, path for execution visible right now, very little uncertainty
Expected Time Commitment	Medium project – 175 hours
Mentor	Noel Welsh (GitHub: @noelwelsh, Email: noel@noelwelsh.com)
Co-mentor

Generate Scala Documentation website with Scaladoc

Title	Generate Scala Documentation website with Scaladoc
Link to Project	https://github.com/scala/docs.scala-lang/
Brief Description	Scaladoc for Scala 3 has a modern UI and is developed to render static websites. We would like to use it to replace Jekyll in rendering the documentation website.
Expected Outcome	We would like a MVP of the website, generated via Scaladoc. We'd need to add support for some Jekyll features such as include, and our custom tabs liquid extension.
Prerequisites	some Scala knowledge
Ideal Prerequisites	familiarity with Jekyll, fundamentals of CSS and JS
Expected Difficulty	Medium - We mostly expect pure engineering to bring in the needed Jeykll features, which can be tested on the present documentation sources. As a stretch goal the participant may want to work on styling the pages, create a plug-in system for Scaladoc, or work on incremental documentation builds.
Expected Time Commitment	Large project – 350 hours
Mentor	Jamie Thompson (GitHub: @bishabosha, Email: jamie.thompson@bath.edu)
Co-mentor

Dotty-cps-async: support for extensible effect stacks.

Title	Support for extensible effect stacks in dotty-cps-async
Link to Project	https://github.com/rssh/dotty-cps-async
Brief Description	Add support for effect stacks into dotty-cps-async.
Expected Outcome	Project module with working code and documentation for users and effect stack providers.
Prerequisites	Some Scala knowledge
Ideal Prerequisites	Basic knowledge of functional programming and understanding of effect stacks
Expected Difficulty	Medium – path for execution visible right now, but possible high variations of efforts depend of unknown technical details
Expected Time Commitment	Medium project – 175 hours
Mentor	Ruslan Shevchenko (GitHub: @rssh, Email: ruslan@shevchenko.kiev.ua)
Co-mentor

Scala CLI: scripting protocol

Title	Scripting protocol for Scala CLI
Link to Project	https://github.com/VirtusLab/scala-cli
Brief Description	Extend Scala CLI with a scripting protocol that can be used to e.g. create source generators. (building on Bloop's built-in support)
Expected Outcome	You can build a Scala CLI project that will run a source generator (e.g. Protobuf or Smithy). Configuration of script is handled via directives or CLI args, script itself is a self contained scala cli project executed with main method.
Prerequisites	Some familiarity with Scala, understanding of serialization
Ideal Prerequisites	Familiarity with Bloop and Scala-CLI, passion for developer tooling
Expected Difficulty	Medium - protocol needs to expose metadata that is compatible with Scala CLI, and to be extensible in the future (core components are already done, such as Bloop integration)
Expected Time Commitment	Medium project – 175 hours
Mentor	Jamie Thompson (GitHub: @bishabosha, Email: jamie.thompson@bath.edu)
Co-mentor	Kannupriya Kalra (LinkedIn)

Scaladex: New artifact page

Title	New artifact page in Scaladex
Link to Project	https://github.com/scalacenter/scaladex
Brief Description	Add a new page in Scaladex to browse through the list of all artifacts of a project. See full description in scalacenter/scaladex#1337
Expected Outcome	We can deploy the new version of Scaladex where it is possible to browse through the artifacts of a project by their names.
Prerequisites	Some familiarity with Scala and SQL. Basic knowledge about HTML and CSS.
Ideal Prerequisites	Familiarity with Scala's Future, akka-http, doobie
Expected Difficulty	Medium - most of the implementation can be adapted from the existing code
Expected Time Commitment	Medium project – 175 hours
Spoken Language	French and English
Mentor	Adrien Piquerez (GitHub: @adpi2, Email: adrien.piquerez@epfl.ch)
Co-mentor	Kannupriya Kalra (LinkedIn)

Scaladex: Displaying information from POM files

Title	Information from POM files in Scaladex
Link to Project	https://github.com/scalacenter/scaladex
Brief Description	Extract information from POM files to display them in the artifact page of Scaladex. See full description in scalacenter/scaladex#979
Expected Outcome	We can deploy the new version of Scaladex where it is possible to browse through the artifacts of a project by their names.
Prerequisites	Some familiarity with Scala and SQL. Basic knowledge about HTML and CSS.
Ideal Prerequisites	Familiarity with Scala's Future, akka-http, doobie
Expected Difficulty	Medium - most of the implementation can be adapted from the existing code
Expected Time Commitment	Medium project – 175 hours
Spoken Language	French and English
Mentor	Adrien Piquerez (GitHub: @adpi2, Email: adrien.piquerez@epfl.ch)
Co-mentor	Kannupriya Kalra (LinkedIn)

Scalafix: ExplicitResultTypes for Scala 3

Title	Add Scala 3 support to ExplicitResultTypes
Link to Project	scalacenter/scalafix#1583
Brief Description	At the moment, ExplicitResultTypes can only run against source files compiled with Scala 2, as its implementation relies on the Scala 2 presentation compiler. A 2022 GSoC added Scala 3 cross-compilation for all Scalafix modules, so we can now add and publish an implementation supporting source files compiled with Scala 3, leveraging the stable Scala 3 presentation compiler API, available in Scala 3.3.3 and later.
Expected Outcome	ExplicitResultTypes can run against source files compiled with Scala 3 (validated by an extensive Scala 3 corpus / test suite & smoke-runs on a couple of major Scala 3 projects). As a side effect, ability for rule authors to write Scalafix rules in Scala 3. As a bonus, potential ability to run, against source files compiled with Scala 3, ExplicitResultTypes along with community rules written in Scala 2 and published with TASTy.
Prerequisites	Some knowledge of Scala internals
Ideal Prerequisites	Experience with SemanticDB and the Scala 2 or 3 presentation compiler
Expected Difficulty	Medium - the stable presentation compiler API was added as an effort to upstream the mtags module from the Metals project, which provides a similar feature, so we do not foresee any contribution to the compiler, only integration work
Expected Time Commitment	Medium project – 175 hours
Spoken Language	French or English
Mentor	Brice Jaglin (GitHub: @bjaglin, Email: bjaglin@gmail.com)
Co-mentor

Sounds of Scala Sampler

Title	Sounds of Scala Sampler
Link to Project	Sounds of Scala
Brief Description	Build a basic sampler, extending the current codebase as necessary to support this functionality.
Expected Outcome	The minimum functionality to be able to load samples (e.g from FreeSound or other source) and play them back. There are unlimited possibilities for extensions. The most basic features are pitch shifting, looping, and effects such as envelopes, reverb, and distortion.
Prerequisites	Some basic knowledge of digital music and Scala.
Ideal Prerequisites	Some knowledge of Web Audio would also be helpful.
Expected Difficulty	Medium. The basic project is quite simple but extensions have increasing complexity.
Expected Time Commitment	Medium project – 175 hours
Spoken Language	English
Mentor	Noel Welsh (GitHub: @noelwelsh, Email: noel@noelwelsh.com)
Co-mentor	Paul Matthews (Github: @pauliamgiant)

Sounds of Scala Composable Sound Synthesis

Title	Sounds of Scala Audio Graph
Link to Project	Sounds of Scala
Brief Description	Build an audio graph library in Scala, that compiles to Web Audio.
Expected Outcome	Users can specify an audio graph (consisting of sound sources, transformations, and sink) and run it in the browser using Web Audio. Extensions would allow interactivity, such as controlling sounds from keyboard and mouse events, and changing the graph while it is running.
Prerequisites	Some basic knowledge of digital music and Scala.
Ideal Prerequisites	Some knowledge of Web Audio would also be helpful.
Expected Difficulty	Medium. The basic project is quite simple but extensions have increasing complexity.
Expected Time Commitment	Medium project – 175 hours
Spoken Language	English
Mentor	Noel Welsh (GitHub: @noelwelsh, Email: noel@noelwelsh.com)
Co-mentor	Paul Matthews (Github: @pauliamgiant)

Scala embedding of the jq language

Title	Tagless-final embedding of jq
Link to Project	JqScala
Brief Description	The project aims at embedding the jq language in Scala, as well as implementing an interpreter over the fs2 streaming library.
Expected Outcome	The project has just been launched, so currently there is only a blueprint with the implementation of a handful keywords and combinators from jq. The goal of the student is to work towards completion of the implementation with the addition of new jq filters.
Prerequisites	Basic knowledge of functional programming in Scala: algebraic data types, higher-order functions and type-classes. Basic knowledge of fs2 or other streaming library of the Scala ecosystem (e.g. Akka Streams, ZIO Streams, etc.).
Ideal Prerequisites	Intermediate knowledge of functional programming: DSL embedding techniques and tagless-final, in particular.
Expected Difficulty	Medium. Applicants will receive guidance to understand the architecture of the embedding and the fs2 implementation. The difficulty will largely depend on the complexity of the jq filters chosen for development.
Expected Time Commitment	Medium project – 175 hours
Spoken Language	English
Mentor	Juan Manuel Serrano (GitHub: @jserranohidalgo, Email: [juanmanuel.serrano@urjc.es])
Co-mentor	Zainab Ali (Github: @zainab-ali)

Typelevel Ecosystem

For project ideas relating to the Typelevel ecosystem in the categories of AI/ML, serverless, data streaming, observability, and systems programming, please visit https://typelevel.org/gsoc/ideas/.