Top Software Engineers in

Scala Ecosystem and Reactive Programming

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scala
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functional-programming
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akka
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reactive
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typelevel

Scala Ecosystem and Reactive Programming focuses on the use of Scala, a powerful programming language that supports functional and object-oriented styles. This subject area includes libraries and frameworks such as Akka for building concurrent and distributed systems, and ZIO for type-safe, asynchronous programming. It also embraces reactive programming paradigms to create systems that are responsive, resilient, and elastic.

Ranks are based on the open source contributions and reassessed every 30 days

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1

Patrik Nordwall
Akka Tech Lead at Lightbend
/
Sweden
Rock Star
14 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
25 releases, 1528 reviews, 6150 commits in 11 years 3 months
ktoso/akka
2161 commits, 25 comments in 6 years 3 months
akka/akka.io
62 reviews, 275 commits, 250 PRs in 10 years 4 months
Top skills
Score
projections
10
functional-programming
10
persistence
10

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2

Viktor Klang
Software Engineer
/
Sweden
Rock Star
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
6 reviews, 4821 commits, 86 PRs in 12 years
ktoso/akka
4085 commits in 6 years 5 months
reactive-streams/reactive-streams.github.io
34 commits, 21 PRs, 43 pushes in 7 years 7 months
Top skills
Score
faas
10
jvm-languages
10
http
10

#

3

Jason Zaugg
Principal Engineer at Lightbend, Inc.
/
Australia
Rock Star
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
retronym/scala
3379 commits, 206 PRs, 3545 pushes in 10 years 6 months
scala/scala
4 releases, 118 reviews, 3558 commits in 10 years 10 months
scalaz/scalaz
1061 commits, 2 PRs, 12 comments in 6 years 6 months
Top skills
Score
deb
10
scalajs
10
large-scale
10

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4

James Roper
Principal Architect, Lightbend at Lightbend
/
Australia
Rock Star
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
2 reviews, 2106 commits, 629 PRs in 9 years 9 months
playframework/play-generated-docs
76 commits, 4159 pushes, 2 branches in 2 years 6 months
lagom/lagom.github.io
4 reviews, 62 commits, 28 PRs in 5 years 10 months
Top skills
Score
deb
10
h2
10
state-management
10

#

5

Lukas Rytz
Lead of the Scala Team at Lightbend
/
Switzerland
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/scala
10 releases, 961 reviews, 3110 commits in 15 years
retronym/scala
284 commits, 6 PRs, 29 pushes in 13 years 6 months
lrytz/asm
95 commits, 4 pushes, 6 tags in 7 years
Top skills
Score
scalac
10
scala-xml
10
corpus
10

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6

Roland Kuhn
Employed at Actyx AG
/
Germany
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
2575 commits, 393 PRs, 540 pushes in 7 years 5 months
ktoso/akka
1627 commits, 11 comments in 5 years 1 month
akka-ja/akka-doc-ja
479 commits in 5 years 5 months
Top skills
Score
sbt
10
standard-library
10
jvm
10

#

7

Matthias Kurz
Play Framework | Full Time Community Sponsored Open Source Maintainer at Irregular
/
Austria
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
1 release, 873 reviews, 1671 commits in 9 years
Fyrd/caniuse
45 commits, 42 PRs, 58 comments in 6 years 7 months
playframework/play-generated-docs
14 commits, 6 PRs, 28 pushes in 1 year
Top skills
Score
html5
10
atom-plugin
10
searching
10

#

8

Adriaan Moors
Learning to use the tools I helped build. at Zf
/
Switzerland
Rock Star
17 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/scala
19 releases, 2737 commits, 1106 PRs in 14 years 2 months
adriaanm/scala
989 commits, 33 PRs, 1316 pushes in 10 years 6 months
scala/scala-jenkins-infra
1 release, 438 commits, 121 PRs in 4 years 4 months
Top skills
Score
sbt
10
bug-tracker
10
shapeless
10

#

9

Konrad Malawski
Swift Team @ 🍎 at Apple
/
Japan
Rock Star
14 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
apple/swift-distributed-actors
8 releases, 339 reviews, 1233 commits in 4 years 2 months
akka/akka
2445 commits, 1982 PRs, 1376 pushes in 4 years 8 months
ktoso/akka
1014 commits, 36 PRs, 1520 pushes in 6 years 4 months
Top skills
Score
versioning
10
propagation
10
dispatch
10

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10

Paul Phillips
Employed at CAZ, Inc.
/
United States
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scalagwt/scalagwt-scala
2606 commits in 3 years
scala/scala
1 review, 1720 commits, 6 PRs in 5 years 8 months
dwijnand/psp-std
633 commits in 3 years 2 months
Top skills
Score
sbt
10
recursion
10
heterogeneous
10

#

11

Seth Tisue
on the Scala team at Lightbend
/
United States
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/community-build
6 reviews, 5561 commits, 2330 PRs in 7 years 8 months
NetLogo/NetLogo
2 reviews, 3048 commits, 32 PRs in 10 years 9 months
scala/make-release-notes
818 commits, 261 PRs, 833 pushes in 7 years 7 months
Top skills
Score
projections
10
cookbook
10
standard-library
10

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12

Marcos Pereira
Engineering Manager/Tech Lead/Software Engineer at CircleCI
/
Canada
Rock Star
11 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
24 releases, 16 reviews, 838 commits in 4 years 11 months
lagom/lagom
6 releases, 3 reviews, 224 commits in 3 years 9 months
playframework/scalatestplus-play
81 commits, 99 PRs, 41 pushes in 3 years 10 months
Top skills
Score
sbt
10
lagom
10
jwe
10

#

13

‍greg Methvin
Principal Engineer at Iterable
/
United States
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
118 reviews, 827 commits, 1271 PRs in 9 years 1 month
gmethvin/directory-watcher
50 reviews, 168 commits, 81 PRs in 5 years 3 months
playframework/play-generated-docs
3 commits, 5 PRs, 7 pushes in 1 year 6 months
Top skills
Score
data-binding
10
functional-programming
10
oauth2
10

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14

Johan Andren
in the Akka Team @ Lightbend at Lightbend
/
Sweden
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
15 releases, 2015 reviews, 1109 commits in 7 years 2 months
johanandren/akka
1092 commits, 6 PRs, 2190 pushes in 6 years 10 months
lightbend/kalix-jvm-sdk
1 release, 828 reviews, 132 commits in 1 year 10 months
Top skills
Score
projections
10
clusters
10
jvm
10

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15

Peter Hausel
Engineering Leadership at Google
/
United States
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
LeToNode/Play2.0-CN-doc
313 commits in 3 months
playframework/playframework
636 commits, 1 comment in 2 years 5 months
pk11/sedis
32 commits, 5 PRs, 5 pushes in 4 years 8 months
Top skills
Score
sbt-plugin
10
web-framework
10
deep-learning
10

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16

Will Sargent
Scala/Java Contractor/Consultant at Terse Systems
/
United States
Rock Star
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
17 reviews, 601 commits, 736 PRs in 8 years 9 months
wsargent/docker-cheat-sheet
1 review, 225 commits, 134 PRs in 4 years 8 months
tersesystems/terse-logback
28 releases, 1 review, 340 commits in 4 years
Top skills
Score
rewrite
10
api
10
package-manager
10

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17

Björn Antonsson
Senior Software Engineer at Datadog
/
Sweden
Rock Star
12 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
DataDog/dd-trace-java
1 release, 2298 reviews, 807 commits in 2 years 9 months
akka/akka
899 commits, 49 PRs, 15 pushes in 5 years 9 months
ktoso/akka
563 commits, 1 comment in 4 years 8 months
Top skills
Score
sbt-plugin
10
concurrency
10
javaagent
10

#

18

Guillaume Bort
Staff Software Engineer at Datadog
/
France
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
LeToNode/Play2.0-CN-doc
277 commits in 4 months
playframework/playframework
567 commits in 1 year 9 months
playframework/play1
532 commits in 5 years 3 months
Top skills
Score
kafka-consumer
10
play-framework
10
futures
10

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19

Rich Dougherty
Software Engineer at Bank
/
New Zealand
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
564 commits, 338 PRs, 190 pushes in 5 years 6 months
playframework/prune
149 commits, 4 PRs, 1231 pushes in 2 years 9 months
playframework/play-generated-docs
3 commits in 4 months
Top skills
Score
sbt
10
playframework
10
testing
10

#

20

Arnout Engelen
Independent Open Source Engineer at The Apache Software Foundation
/
Netherlands
Rock Star
22 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
raboof/notion
3 releases, 27 reviews, 2331 commits in 20 years 10 months
akka/akka-http
16 releases, 377 reviews, 384 commits in 4 years 10 months
raboof/nethogs
6 releases, 40 reviews, 273 commits in 18 years 9 months
Top skills
Score
tiling
10
logback
10
twirl
10

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