Why domain knowledge is so important
https://youtu.be/XE0ouF4YUgY

https://redd.it/1o2pbc2
@r_scala

Is anyone else glad Scala doesn’t use a Hindley-Milner type system?

I am new to scala, which I have been using to practice leetcode type problems because I like that I can model problems recursively or iteratively. There's alot to love about the language. I'm a typescript dev who is trying to branch out, so I have no production experience with any other language.

I have a little experience with Haskell and O'Caml, and I've heard people praise the Hindley Milner type system that they offer. Scala has gone a diferent route, which I guess was the result of the technical difficulty of subtypes + Hindley Milner. I don't really have good grasp of type theory, but this is what I have read from other posts.

I have struggled with the math-y nature of Hindley Milner. For example, the return of a function being the last value in a chain of arrows ("->") isn't that clear to me. ML type inference also has felt unnatural to me.

This could all be the product of inexperience, but I have found the the explicit typing in Scala to feel more transparent and production ready.

I guess this thread is more about Hindley-Milner than Scala, but is anyone glad that Scala does not use it? Apologies if this discussion has been done to death outside the context of Scala.

https://redd.it/1nzirek
@r_scala

Need help to choose either java or Scala

To begin with, I am an trainee data engineer(recently joined one small startup)I mostly work on data bricks, azure data factory, azure cloud, recently after joining the company I completed course on apache spark developer(in databricks academy) so I got better understanding on spark and learnt pyspark.

In addition, I am very curious to learn dsa and Iam very good at python and sql and I can solve easy problems on leetcode(solved 180+ till now) but, when I tried to solve medium or hard I will get out of memory error because I am applying brute force approach to solve problems.

I wanted to increase my skillset where I cannot able to draw a conclusion about which language I have to use either java or scala.
I will give reasons that are running in my head:

My opinion for learning java, I feel that it will be helpful and I can land on a better job after 2 years and also it will help me in the long run of my career.

My opinion for learning scala, To ace in data engineering field I have to use scala to achieve better time efficiency compared to pyspark and I believe that it is used by many product based company’s. And for solving leetcode problems leetcode support scala for some problems which are under data structures and algorithms

So if you are a scala developer or a person uses scala in your job. which language do you prefer for me to learn and why

Please help me I am very confused…


https://redd.it/1o41eue
@r_scala

incremental compilation of Scala 3
https://eed3si9n.com/incremental-compilation-of-scala3/

https://redd.it/1o4koag
@r_scala

Create laminar GQL app
https://github.com/kossalw/create-laminar-app/

https://redd.it/1o51l93
@r_scala

Announcement Paper Presentation at ICFP/SPLASH 2025 – “Mentoring in the Scala Ecosystem” by Kannupriya Kalra

Hi everyone, I’m happy to share that my mentor, Kannupriya Kalra, will be presenting her paper “Mentoring in the Scala Ecosystem: Insights from Google Summer of Code” at ICFP/SPLASH 2025, taking place from October 12–18 in Singapore.

Talk link: https://2025.workshop.scala-lang.org/details/scala-2025/8/Mentoring-in-the-Scala-Ecosystem-Insights-from-Google-Summer-of-Code
Date and time: October 13, 2025 | 17:20–17:40
(Day 2) Venue: Peony West, Marina Bay Sands Convention Center, Singapore.
Livestream: https://www.youtube.com/@acmsigplan
Scala Workshop schedule: https://2025.workshop.scala-lang.org/#program
Conference info: https://conf.researchr.org/home/icfp-splash-2025

As Scala continues to evolve, so must its community. In this talk, she will share practical lessons from two years of mentoring and organizing for Google Summer of Code (GSoC) with the Scala Center, helping new contributors grow into confident open-source developers.

Drawing from real-world experience with projects like Scaladex, Scala CLI and LLM4S, this session explores what works (and what doesn’t) when mentoring newcomers in a strongly typed, functional ecosystem. Whether you’re a maintainer, educator, or contributor, you’ll come away with actionable insights to grow Scala’s contributor pipeline and make your own projects more welcoming and sustainable.

https://redd.it/1o5g0wn
@r_scala

Workflows4s Web UI: OSS Full Stack App Ready for Production

https://medium.com/business4s-blog/workflows4s-web-ui-oss-full-stack-app-ready-for-production-ca09a706014d

https://redd.it/1o5fjhf
@r_scala

Demystifying Scala 3 Types By Bill Venners
https://watch.softinio.com/w/6Ubx9SPfjXDH2yBke158R4

https://redd.it/1o68h95
@r_scala

Laminar for React developers
https://github.com/johnhungerford/laminar-react/blob/main/LAMINAR-REACT.md

https://redd.it/1o6gqbl
@r_scala

Simpler Build Tools with Functional and Object Oriented Programming, Scala Workshop 2025
https://www.youtube.com/watch?v=tNsz_dGCsVs

https://redd.it/1o6n82x
@r_scala

LLM4S Dev Hour - Weekly Live Coding & Collaboration (Open to All!)

Hey Everyone!

We're hosting LLM4S Dev Hour, a weekly live coding + collaboration session where contributors, learners and open-source enthusiast come together to build, debug, and learn around the project.

LLM4s Project (star us): [https://github.com/llm4s/llm4s](https://github.com/llm4s/llm4s)

No matter your skill level whether you're curious about learning GenAI, scala, interested in participating in Google Summer of Code 2026 program or just want to hang out and see how production ready GenAI toolkit is created, you're welcome to join!

When: Every Sunday, 9AM London (UK) time.
Global GenAI Community (see #llm4s-dev-hour channel for updates): [https://discord.gg/AZcBASdA](https://discord.gg/AZcBASdA)
Luma Invite 19^(th) Oct (add to calender): [https://luma.com/f42dk2mc](https://luma.com/f42dk2mc)
Weekly session calender: [https://luma.com/calendar/cal-Zd9BLb5jbZewxLA](https://luma.com/calendar/cal-Zd9BLb5jbZewxLA)

Hosts:
Kannupriya Karla - Engineering Leader & Scala Engineer
Rory Graves - Senior AI Researcher & Scala Advocate

Featured in:
[https://scalac.io/blog/scala-days-2025-recap-a-scala-community-reunion/](https://scalac.io/blog/scala-days-2025-recap-a-scala-community-reunion/)
[https://xebia.com/blog/scala-days-2025-ai-integration/](https://xebia.com/blog/scala-days-2025-ai-integration/)
[https://scalatimes.com/d8ac7ba40a](https://scalatimes.com/d8ac7ba40a)

This is not just a coding meetup - it's where you:

* Learn how open-source projects actually move: from issue triage to PR reviews.
* Understand the scala ecosystem and how LLM integration is shaping real developer tools.
* Connect directly with mentors (many of whom lead GSoC projects every year).
* Build your track record early contributors who engaged here often become strong GSoC candidates later.
* Ask real questions about code design, architecture, or proposal prep which is live and unfiltered.

Whether you're new to scala or already hacking on AI tooling, you'll walk away each week with something new with a clear concept or a better mental of open collaboration.

Come build, learn, and grow - one commit at a time.

https://preview.redd.it/gh5is24984vf1.jpg?width=2048&format=pjpg&auto=webp&s=22769a0318115e40531d9d4c8a0ba5f2dccd4e2e

https://redd.it/1o6mkol
@r_scala

Streaming for ScalaIO

We just opened tickets for streaming : https://scala.io/#tickets ( https://scala.io/schedule ).

It gives access to a live and replay link, so if you are not in the same timezone, you can come back to it!

https://redd.it/1o7zbgk
@r_scala

This week in #Scala (Oct 13, 2025)
https://open.substack.com/pub/thisweekinscala/p/this-week-in-scala-oct-13-2025?r=8f3fq&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true

https://redd.it/1o5r4nw
@r_scala

Effective Webapp Development Flow - 25h Sprint Retrospective
https://anatoliikmwww.tg-me.com/posts/2025-10-17-effective-webapp-flow/

https://redd.it/1o8nya0
@r_scala

Why Most Apps Should Start as Monoliths
https://youtu.be/fy3jQNB0wlY

https://redd.it/1o8s0oa
@r_scala

Godot + Scala + Mill

https://github.com/optical002/godot-scala-template

https://redd.it/1o9gwcs
@r_scala

testkit for zio-test v1.0.4 released

Simple utility addition for zio-test that allows you to single out 1 test in a suite, or run the suite up to a given point. Saves a lot of commenting/un-commenting (or trying to remember arcane sbt commands) when fixing "whack-a-mole" tests after a code change that breaks a lot of tests. Library provides @@only to isolate a single test, or @@until to run up to the marked test.

GitHub with instructions here: co.blocke.testkit

https://redd.it/1oaemo7
@r_scala

[Hiring] Senior Scala Engineer Opportunity with Disney Streaming

Hey everyone. I'm a recruiter with Disney Streaming and we're in the market for a U.S.-based Senior Software Engineer that is well-versed in Scala. I've posted to this community before and have been able to get some people screened and interviewed, so wanted to circle back!

The opportunity is with our Orders team. You'd be working on backend commerce services for our streaming products. We're looking for strong senior level coders. Per the team, you don't need to be an expert in Scala, but you'll be working a lot in it, specifically Cats Effects. Other than that, the only other qualifications would be having at least 5 years of related SDE experience and a bachelors in a related field of study. (No degree or degree in unrelated field is also ok, we'd just need additional YOE). Unfortunately, we would not be able to offer sponsorship at this time.

Lastly, the position would need to be **onsite** 4x/week out of one of our tech hubs. These would be NYC, LA, Seattle, and San Francisco. The full base pay ranges are listed in the job description, but we typically target the midpoint for candidates that meet our basic qualifications. I've included the likely offers below:

* NYC or Seattle: Around $170k base
* LA: Around $160k base
* SF Bay: Around $175k base

If you're interested, or know anyone who might be, please feel free to send me a message directly. Thanks all!

https://redd.it/1ob1pbt
@r_scala