Top Software Engineers in

Scala Ecosystem and Reactive Programming

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reactive
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akka
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scala
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functional-programming
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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
23 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 6150 commits in 11 years 3 months
ktoso/akka
Akka: 2161 commits in 6 years 3 months
akka-ja/akka-doc-ja
Akka-doc-ja: 646 commits in 4 years 11 months
Top skills
Score
akka
10
cloud-native
10
streaming
10

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2

Viktor Klang
Software Engineer
/
Sweden
Rock Star
15 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 4821 commits in 12 years
ktoso/akka
Akka: 4085 commits in 6 years 5 months
akka-ja/akka-doc-ja
Akka-doc-ja: 482 commits in 4 years 11 months
Top skills
Score
reactive
10
cloud-native
10
streaming
10

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3

Jason Zaugg
Principal Engineer at Lightbend, Inc.
/
Australia
Rock Star
TOP CONTRIBUTIONS TO PROJECTS
scala/scala
Scala: 3558 commits in 10 years 10 months
retronym/scala
Scala: 3379 commits in 10 years 6 months
scalaz/scalaz
Scalaz: 1061 commits in 6 years 6 months
Top skills
Score
scala
10
functional-programming
10
jvm-languages
9

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4

Lukas Rytz
Lead of the Scala Team at Lightbend
/
Switzerland
Rock Star
10 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/scala
Scala: 3110 commits in 15 years
scalagwt/scalagwt-scala
Scalagwt-scala: 345 commits in 3 years 11 months
retronym/scala
Scala: 284 commits in 13 years 6 months
Top skills
Score
scala
10
scala-compiler
10
jvm-languages
10

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5

Adriaan Moors
Learning to use the tools I helped build. at Zf
/
Switzerland
Rock Star
20 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/scala
Scala: 2737 commits in 14 years 2 months
adriaanm/scala
Scala: 989 commits in 10 years 6 months
scala/scala-jenkins-infra
Scala-jenkins-infra: 438 commits in 4 years 4 months
Top skills
Score
scala
10
jvm-languages
10
scala-compiler
10

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6

Roland Kuhn
CTO and co-founder of Actyx AG at Actyx
/
Germany
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 2575 commits in 7 years 5 months
ktoso/akka
Akka: 1627 commits in 5 years 1 months
akka-ja/akka-doc-ja
Akka-doc-ja: 479 commits in 5 years 5 months
Top skills
Score
reactive
10
akka
10
concurrency
10

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7

Konrad Malawski
Swift Team @ 🍎 at Apple
/
Japan
Rock Star
20 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 2445 commits in 4 years 8 months
apple/swift-distributed-actors
Swift-distributed-actors: 1233 commits in 4 years 2 months
ktoso/akka
Akka: 1014 commits in 6 years 4 months
Top skills
Score
distributed-systems
10
akka
10
reactive
10

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8

Johannes Rudolph
Performance-minded engineer at Lightbend, Inc.
/
Germany
Rock Star
19 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 1801 commits in 11 years 3 months
akka/akka-http
Akka-http: 1010 commits in 6 years 9 months
ktoso/akka
Akka: 545 commits in 6 years 8 months
Top skills
Score
reactive
10
streaming
10
distributed-systems
10

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9

James Roper
Principal Architect, Lightbend at Lightbend
/
Australia
Rock Star
22 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
Playframework: 2106 commits in 9 years 9 months
cloudstateio/cloudstate
Cloudstate: 214 commits in 1 year 10 months
pebbleblog/pebble
Pebble: 202 commits in 11 years 2 months
Top skills
Score
reactive
10
scala
10
playframework
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
Scalagwt-scala: 2606 commits in 3 years
scala/scala
Scala: 1720 commits in 5 years 8 months
dwijnand/psp-std
Psp-std: 633 commits in 3 years 2 months
Top skills
Score
scala
10
jvm-languages
10
scala-compiler
10

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11

Seth Tisue
on the Scala team at Lightbend
/
United States
Rock Star
33 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scala/community-build
Community-build: 5561 commits in 7 years 8 months
NetLogo/NetLogo
NetLogo: 3048 commits in 10 years 9 months
scala/scala
Scala: 1570 commits in 9 years 8 months
Top skills
Score
scala
10
jvm-languages
6
scala-compiler
6

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12

Matthias Kurz
It is not enough to do your best, you must know what to do, and THEN do your best.
/
Austria
Rock Star
30 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
Playframework: 1671 commits in 9 years
schaloner/deadbolt-2-java
Deadbolt-2-java: 205 commits in 4 years 8 months
playframework/twirl
Twirl: 198 commits in 4 years 11 months
Top skills
Score
scala
10
java
10
jvm
10

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13

Johan Andren
in the Akka Team @ Lightbend at Lightbend
/
Sweden
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 1109 commits in 7 years 2 months
johanandren/akka
Akka: 1092 commits in 6 years 10 months
akka/akka.io
Akka.io: 160 commits in 6 years 10 months
Top skills
Score
akka
10
streaming
10
cloud-native
10

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14

Björn Antonsson
Senior Software Engineer at Datadog
/
Sweden
Rock Star
26 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 899 commits in 5 years 9 months
DataDog/dd-trace-java
Dd-trace-java: 807 commits in 2 years 9 months
ktoso/akka
Akka: 563 commits in 4 years 8 months
Top skills
Score
akka
10
streaming
10
distributed-systems
10

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15

Arnout Engelen
Independent Open Source Engineer at Engelen Open Source
/
Netherlands
Rock Star
23 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
raboof/notion
Notion: 2331 commits in 20 years 10 months
akka/akka
Akka: 856 commits in 7 years 11 months
raboof/connbeat
Connbeat: 449 commits in 2 years 2 months
Top skills
Score
reactive
10
streaming
10
cloud-native
10

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16

Eugene Burmako
Employed at Twitter Inc
/
United States
Rock Star
14 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
scalameta/scalameta
Scalameta: 4062 commits in 4 years 11 months
scala/scala
Scala: 819 commits in 3 years 1 months
twitter/rsc
Rsc: 722 commits in 1 year 6 months
Top skills
Score
scala
10
scala-compiler
8
jvm-languages
8

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17

Jonas Bonér
CEO & Founder at Lightbend, Inc.
/
Sweden
Rock Star
21 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
akka/akka
Akka: 764 commits in 7 years 1 months
ktoso/akka
Akka: 583 commits in 4 years 3 months
jboner/akka-crdt
Akka-crdt: 122 commits in 3 years 2 months
Top skills
Score
reactive
10
distributed-systems
10
cloud-native
10

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18

Marcos Pereira
Engineering Manager/Tech Lead/Software Engineer at Cap3 GmbH
/
Canada
Rock Star
20 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
Playframework: 838 commits in 4 years 11 months
lagom/lagom
Lagom: 224 commits in 3 years 9 months
playframework/play-ws
Play-ws: 86 commits in 2 years 10 months
Top skills
Score
reactive
10
playframework
10
java
10

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19

‍greg Methvin
Principal Engineer at Iterable
/
United States
Rock Star
16 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
playframework/playframework
Playframework: 827 commits in 9 years 1 months
gmethvin/directory-watcher
Directory-watcher: 168 commits in 5 years 3 months
playframework/play-json
Play-json: 70 commits in 1 year 10 months
Top skills
Score
reactive
10
playframework
10
java
10

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20

Julien Richard-Foy
Caring Software Engineer at Self Employed
/
Switzerland
Rock Star
13 years of coding experience
TOP CONTRIBUTIONS TO PROJECTS
endpoints4s/endpoints4s
Endpoints4s: 846 commits in 6 years 10 months
scala/scala
Scala: 662 commits in 9 years 8 months
scalacenter/scalajs-bundler
Scalajs-bundler: 315 commits in 5 years 4 months
Top skills
Score
scala
10
jvm-languages
8
scala-compiler
8

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