We build tools we wished existed. Our open source libraries are used by Scala teams worldwide to eliminate boilerplate, simplify error handling, and ship faster — all maintained under github.com/theiterators.
A Scala library to eliminate boilerplate. Automatically derives typeclass instances for JSON codecs, DB column mappings, and HTTP unmarshallers across 17+ modules — Slick, Circe, Doobie, http4s, Play JSON and more. Works with Scala 2.13 and Scala 3.
A Scala library for business logic-oriented error handling with for-comprehension support. EitherT on steroids — type-safe, readable, and perfect for taming complex error paths without nested pattern matching.
Pekko HTTP-style DSL directives for http4s, powered by cats-effect’s IO. Supports ~85% of Pekko HTTP directives and runs on JVM, Scala.js, and Scala Native — compatible with Scala 2.13 and Scala 3.
Generate OpenAPI specs, HTML docs, or TypeScript client interfaces directly from routing tests. Supports Pekko HTTP, http4s, ScalaTest, Specs2, and MUnit — API documentation as a natural byproduct of testing.
Since 2015, we’ve been building the Scala community in Warsaw. ScalaWAW is the largest informal gathering of Scala developers in Poland — meetups, talks, hackathons and beer sessions for everyone from beginners to language contributors.
We organize and sponsor ScalaWAW. Our managing partner Łukasz Sowa has led the group since day one and serves as an official Scala Ambassador appointed by the Scala Center.
Topics range from functional programming patterns and type-level Scala, to build tooling, Akka, and Apache Spark. Guests have included international speakers like Li Haoyi and Bartosz Milewski.
Join us on Meetup