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Beginner Friendly Open-Source Scala

Good First Issues in Scala

Explore curated starter issues in high-scoring Scala repositories. Every listed issue belongs to a welcoming repository scored by C-Rankâ„¢ on PR merge rates, review responsiveness, and first-timer acceptance.

Updated: Mon, 31 Aug 2026 UTC (Live GitHub Sync)
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Top Scala Repositories with Beginner Issues (20)

Updated Daily via GitHub GraphQL
sbt
sbt
sbt/sbt
S•Elite
4.9k·Scala

sbt, the interactive build tool

#build-tool#sbt#scala
89%
Merge Rate
13h
Review Time
81%
1st-Timers
1 GFI
Scorecard
FasterXML
jackson-module-scala
FasterXML/jackson-module-scala
B•Solid
507·Scala

Add-on module for Jackson (https://github.com/FasterXML/jackson) to support Scala-specific datatypes

#cbor#hacktoberfest#jackson
92%
Merge Rate
23h
Review Time
100%
1st-Timers
1 GFI
Scorecard
canton-network
splice
canton-network/splice
A•Welcoming
112·Scala

Splice repository

85%
Merge Rate
2d
Review Time
75%
1st-Timers
3 GFI
Scorecard
scala-steward-org
scala-steward
scala-steward-org/scala-steward
A•Welcoming
1.2k·Scala

:robot: A bot that helps you keep your projects up-to-date

#bitbucket#bot#dependencies
85%
Merge Rate
18h
Review Time
100%
1st-Timers
1 GFI
Scorecard
effekt-lang
effekt
effekt-lang/effekt
A•Welcoming
462·Scala

A language with lexical effect handlers and lightweight effect polymorphism

#algebraic-effects#control-flow#delimited-continuation
71%
Merge Rate
<1h
Review Time
73%
1st-Timers
2 GFI
Scorecard
scalameta
scalafmt
scalameta/scalafmt
A•Welcoming
1.5k·Scala

Code formatter for Scala

#formatter#scala
93%
Merge Rate
3d
Review Time
50%
1st-Timers
1 GFI
Scorecard
typelevel
otel4s
typelevel/otel4s
B•Solid
215·Scala

An OpenTelemetry library for Scala based on Cats-Effect

#cats#cats-effect#metrics
95%
Merge Rate
14d
Review Time
100%
1st-Timers
1 GFI
Scorecard
apache
datafusion-comet
apache/datafusion-comet
A•Welcoming
1.3k·Scala

Apache DataFusion Comet Spark Accelerator

#arrow#datafusion#rust
68%
Merge Rate
3d
Review Time
53%
1st-Timers
8 GFI
Scorecard
business4s
workflows4s
business4s/workflows4s
B•Solid
132·Scala

Simple, Composable, Business-oriented Workflows for Scala

100%
Merge Rate
-
Review Time
100%
1st-Timers
3 GFI
Scorecard
apache
gluten
apache/gluten
A•Welcoming
1.6k·Scala

Gluten is a middle layer responsible for offloading JVM-based SQL engines' execution to native engines.

#arrow#clickhouse#simd
65%
Merge Rate
2d
Review Time
53%
1st-Timers
4 GFI
Scorecard
scalacenter
scalafix
scalacenter/scalafix
B•Solid
875·Scala

Refactoring and linting tool for Scala

#dotty#linter#metaprogramming
78%
Merge Rate
5d
Review Time
25%
1st-Timers
1 GFI
Scorecard
llm4s
llm4s
llm4s/llm4s
B•Solid
255·Scala

Agentic and LLM Programming in Scala

62%
Merge Rate
4d
Review Time
67%
1st-Timers
22 GFI
Scorecard
scalacenter
scastie
scalacenter/scastie
B•Solid
439·Scala

An interactive playground for Scala

#online-repl#sbt
76%
Merge Rate
10d
Review Time
100%
1st-Timers
1 GFI
Scorecard
getkyo
kyo
getkyo/kyo
B•Solid
807·Scala

Toolkit for Scala Development

59%
Merge Rate
14h
Review Time
50%
1st-Timers
1 GFI
Scorecard
zio
zio-http
zio/zio-http
B•Solid
870·Scala

A next-generation Scala framework for building scalable, correct, and efficient HTTP clients and servers

#http#http-client#http-server
75%
Merge Rate
1d
Review Time
50%
1st-Timers
1 GFI
Scorecard
delta-io
delta
delta-io/delta
B•Solid
9.0k·Scala

An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs

#acid#analytics#big-data
61%
Merge Rate
2d
Review Time
65%
1st-Timers
1 GFI
Scorecard
scalacenter
scaladex
scalacenter/scaladex
B•Solid
221·Scala

The Scala Package Index

#bintray#index#packages
33%
Merge Rate
3d
Review Time
50%
1st-Timers
1 GFI
Scorecard
typelevel
cats-effect
typelevel/cats-effect
B•Solid
2.2k·Scala

The pure asynchronous runtime for Scala

#asynchronous#effects#fp
67%
Merge Rate
16h
Review Time
67%
1st-Timers
1 GFI
Scorecard
typelevel
frameless
typelevel/frameless
B•Solid
897·Scala

Expressive types for Spark.

#fp#functional-programming#scala
100%
Merge Rate
2d
Review Time
0%
1st-Timers
1 GFI
Scorecard
aesc-silicon
ElemRV
aesc-silicon/ElemRV
B•Solid
132·Scala

ElemRV - End-to-end Open-Source RISC-V Microcontroller

#asic#chipdesign#open-source-silicon
76%
Merge Rate
13d
Review Time
100%
1st-Timers
4 GFI
Scorecard

How to make your first Scala open-source pull request

Finding approachable Good First Issues in Scala allows you to build real-world software engineering experience. Instead of submitting PRs to abandoned repositories, GetMerged verifies maintainer review speeds and first-timer acceptance rates before you write a single line of code.

Select any issue above to claim it directly on GitHub, or click a repository to inspect full maintainer review turnaround metrics and triage guidance!

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