diff --git a/.gitignore b/.gitignore
index 9c07d4a..97dd83d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,12 @@
-*.class
+
 *.log
+
+*.class
+.idea
+target/
+
+project/target
+.bsp/
+.bloop/
+.vscode/
+
diff --git a/.scalafmt.conf b/.scalafmt.conf
new file mode 100644
index 0000000..15fff87
--- /dev/null
+++ b/.scalafmt.conf
@@ -0,0 +1,4 @@
+version = 2.5.0
+
+align.preset = more    // For pretty alignment.
+maxColumn = 120 // For my wide 30" display.
\ No newline at end of file
diff --git a/build.sbt b/build.sbt
new file mode 100644
index 0000000..b91c6b5
--- /dev/null
+++ b/build.sbt
@@ -0,0 +1,36 @@
+
+lazy val akkaVersion = "2.6.15"
+lazy val akkaHttpVersion = "10.2.5"
+lazy val akkaHttpJsonVersion = "1.37.0"
+lazy val akkaPersistenceJdbc = "5.0.1"
+lazy val circeVersion = "0.14.1"
+lazy val slickVersion = "3.3.3"
+lazy val postgresqlVersion = "42.2.23"
+lazy val tapirAkkaHttpVersion = "0.19.0-M4"
+lazy val logbackClassicVersion = "1.2.5"
+
+lazy val scalaTestVersion = "3.2.9"
+
+lazy val root = (project in file(".")).
+  settings(
+    inThisBuild(List(
+      organization    := "com.igobrilhante",
+      scalaVersion    := "2.13.4"
+    )),
+    name := "github-challenge",
+    libraryDependencies ++= Seq(
+      "com.typesafe.akka" %% "akka-http"                % akkaHttpVersion,
+      "de.heikoseeberger" %% "akka-http-circe"          % akkaHttpJsonVersion,
+      "com.typesafe.akka" %% "akka-actor-typed"         % akkaVersion,
+      "com.typesafe.akka" %% "akka-stream"              % akkaVersion,
+      "ch.qos.logback"    %  "logback-classic"          % logbackClassicVersion,
+
+      "io.circe"          %% "circe-core"               % circeVersion,
+      "io.circe"          %% "circe-generic"            % circeVersion,
+      "io.circe"          %% "circe-parser"             % circeVersion,
+
+      "com.typesafe.akka" %% "akka-http-testkit"        % akkaHttpVersion % Test,
+      "com.typesafe.akka" %% "akka-actor-testkit-typed" % akkaVersion     % Test,
+      "org.scalatest"     %% "scalatest"                % "3.1.4"         % Test
+    )
+  )
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 0000000..f0be67b
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.5.1
diff --git a/project/plugins.sbt b/project/plugins.sbt
new file mode 100644
index 0000000..d4312f7
--- /dev/null
+++ b/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("io.spray" % "sbt-revolver" % "0.9.1")
diff --git a/src/main/resources/application.conf b/src/main/resources/application.conf
new file mode 100644
index 0000000..47c447c
--- /dev/null
+++ b/src/main/resources/application.conf
@@ -0,0 +1,13 @@
+app {
+  routes {
+    # If ask takes more time than this to complete the request is failed
+    ask-timeout = 5s
+  }
+}
+
+github {
+    username = "username"
+    username = ${?GH_USERNAME}
+    token = ""
+    token = ${?GH_TOKEN}
+}
\ No newline at end of file
diff --git a/src/main/resources/logback.xml b/src/main/resources/logback.xml
new file mode 100644
index 0000000..b1fe9ae
--- /dev/null
+++ b/src/main/resources/logback.xml
@@ -0,0 +1,20 @@
+<configuration>
+    <!-- This is a development logging configuration that logs to standard out, for an example of a production
+        logging config, see the Akka docs: https://doc.akka.io/docs/akka/2.6/typed/logging.html#logback -->
+    <appender name="STDOUT" target="System.out" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%date{ISO8601}] [%level] [%logger] [%thread] [%X{akkaSource}] - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender">
+        <queueSize>1024</queueSize>
+        <neverBlock>true</neverBlock>
+        <appender-ref ref="STDOUT" />
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="ASYNC"/>
+    </root>
+
+</configuration>
diff --git a/src/main/scala/com/igobrilhante/GHSystem.scala b/src/main/scala/com/igobrilhante/GHSystem.scala
new file mode 100644
index 0000000..dcac7e8
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/GHSystem.scala
@@ -0,0 +1,12 @@
+package com.igobrilhante
+
+import akka.actor.typed.Behavior
+import akka.actor.typed.scaladsl.Behaviors
+
+object GHSystem {
+
+  trait Command
+
+  def apply(): Behavior[GHSystem.Command] = Behaviors.empty
+
+}
diff --git a/src/main/scala/com/igobrilhante/github/api/GHService.scala b/src/main/scala/com/igobrilhante/github/api/GHService.scala
new file mode 100644
index 0000000..c2cf661
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/api/GHService.scala
@@ -0,0 +1,19 @@
+package com.igobrilhante.github.api
+
+import scala.concurrent.Future
+
+import com.igobrilhante.github.models.{GHContributor, GHOrganization, GHRepository}
+
+trait GHService {
+
+  def getOrganization(organizationId: String): Future[GHOrganization]
+
+  def getRepositories(organizationId: String, page: Int): Future[List[GHRepository]]
+
+  def getAllRepositories(organizationId: String): Future[List[GHRepository]]
+
+  def getContributors(organizationId: String, repositoryId: String): Future[List[GHContributor]]
+
+  def getRankedContributors(organizationId: String): Future[List[GHContributor]]
+
+}
diff --git a/src/main/scala/com/igobrilhante/github/commons/Logging.scala b/src/main/scala/com/igobrilhante/github/commons/Logging.scala
new file mode 100644
index 0000000..6932b08
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/commons/Logging.scala
@@ -0,0 +1,7 @@
+package com.igobrilhante.github.commons
+
+import org.slf4j.{Logger, LoggerFactory}
+
+trait Logging {
+  val logger: Logger = LoggerFactory.getLogger(this.getClass)
+}
diff --git a/src/main/scala/com/igobrilhante/github/impl/GHServiceImpl.scala b/src/main/scala/com/igobrilhante/github/impl/GHServiceImpl.scala
new file mode 100644
index 0000000..4e49491
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/impl/GHServiceImpl.scala
@@ -0,0 +1,139 @@
+package com.igobrilhante.github.impl
+
+import scala.concurrent.{ExecutionContext, Future}
+
+import akka.actor.typed.ActorSystem
+import akka.http.javadsl.unmarshalling.Unmarshaller
+import akka.http.scaladsl.Http
+import akka.http.scaladsl.model.{HttpHeader, HttpRequest, HttpResponse}
+import akka.http.scaladsl.unmarshalling.{Unmarshal, Unmarshaller}
+import akka.stream.Materializer
+import akka.http.scaladsl.model._
+import HttpMethods._
+
+import com.igobrilhante.GHSystem
+import com.igobrilhante.github.api.GHService
+import com.igobrilhante.github.models.{GHCommit, GHContributor, GHOrganization, GHRepository}
+import de.heikoseeberger.akkahttpcirce.FailFastCirceSupport._
+import HttpProtocols._
+import MediaTypes._
+import HttpCharsets._
+import akka.http.scaladsl.model.headers.BasicHttpCredentials
+
+import com.igobrilhante.github.commons.Logging
+
+class GHServiceImpl()(implicit val system: ActorSystem[_], val ec: ExecutionContext) extends GHService with Logging {
+
+  private val mat               = Materializer.matFromSystem
+  private val BaseApi           = "https://api.github.com"
+  private val http              = Http(system)
+  private val MaxReposPerPage   = 100
+  private val config            = system.settings.config
+  private val githubConfig      = config.getConfig("github")
+  private val GitHubUser        = githubConfig.getString("username")
+  private val GitHubToken       = githubConfig.getString("token")
+  private val GitHubCredentials = BasicHttpCredentials(GitHubUser, GitHubToken)
+
+  override def getOrganization(organizationId: String): Future[GHOrganization] = {
+    val uri = s"$BaseApi/orgs/${organizationId}"
+    for {
+      response <- request(uri)
+      list     <- Unmarshal(response).to[GHOrganization]
+    } yield list
+  }
+
+  override def getRepositories(organizationId: String, page: Int = 1): Future[List[GHRepository]] = {
+    val uri = s"$BaseApi/orgs/${organizationId}/repos?page=$page&per_page=$MaxReposPerPage"
+    for {
+      response <- request(uri)
+      list     <- Unmarshal(response).to[List[GHRepository]]
+    } yield list
+
+  }
+
+  override def getContributors(organizationId: String, repositoryId: String): Future[List[GHContributor]] = {
+    val uri = s"$BaseApi/repos/${organizationId}/${repositoryId}/contributors"
+    for {
+      response <- request(uri)
+      list     <- Unmarshal(response).to[List[GHContributor]]
+    } yield list
+  }
+
+  def getRankedContributors(organizationId: String): Future[List[GHContributor]] = {
+
+    def rankContributors(list: List[(GHRepository, List[GHContributor])]) = {
+
+      list
+        .flatMap { case (repo, contributors) => contributors.map((_, repo)) }
+        .groupBy(_._1.login)
+        .map {
+          case (_, contributorRepositories) =>
+            val totalContributions = contributorRepositories.map(_._1.contributions).sum
+            val contributor        = contributorRepositories.head._1
+            contributor.copy(contributions = totalContributions)
+        }
+        .toList
+        .sortBy(_.contributions)(Ordering[Int].reverse)
+
+    }
+
+    for {
+      allRepositories <- getAllRepositories(organizationId)
+      reposAndContributors <-
+        Future.sequence(allRepositories.map(repo => getContributors(organizationId, repo.name).map(c => (repo, c))))
+      result = rankContributors(reposAndContributors)
+    } yield result
+  }
+
+  def getAllRepositories(organizationId: String): Future[List[GHRepository]] = {
+    getAllRepositoriesStrategy(organizationId)
+  }
+
+  private def getAllRepositoriesStrategy(organizationId: String): Future[List[GHRepository]] = {
+
+    def test(buckets: Int) = {
+      (1 to buckets)
+        .map(page => getRepositories(organizationId, page))
+        .foldLeft(Future.successful(List.empty[GHRepository])) {
+          case (result, future) =>
+            for {
+              currentList <- result
+              next        <- future
+            } yield (currentList ++ next)
+        }
+    }
+
+    for {
+      org <- getOrganization(organizationId)
+      total   = org.total
+      buckets = math.ceil(total / MaxReposPerPage.toDouble).toInt
+      result <- test(buckets)
+    } yield result
+  }
+
+  private def getAllRepositoriesRecursive(organizationId: String): Future[List[GHRepository]] = {
+    def getRepos(page: Int): Future[List[GHRepository]] = {
+      for {
+        repos <- getRepositories(organizationId, page)
+        result <- {
+          if (repos.length < MaxReposPerPage) Future.successful(repos)
+          else getRepos(page + 1).map(_ ++ repos)
+        }
+      } yield result
+    }
+    getRepos(page = 1)
+  }
+
+  private def request(uri: String) =
+    http.singleRequest(
+      HttpRequest(uri = uri).withHeaders(
+        headers.Authorization(GitHubCredentials)
+      )
+    )
+
+//  private def request2[A](uri: String)(implicit um: Unmarshaller[HttpResponse, A]) =
+//    http
+//      .singleRequest(HttpRequest(uri = uri))
+//      .flatMap(response => Unmarshal(response).to[A](um, ec, mat))
+
+}
diff --git a/src/main/scala/com/igobrilhante/github/models/GHCommit.scala b/src/main/scala/com/igobrilhante/github/models/GHCommit.scala
new file mode 100644
index 0000000..2688bc0
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/models/GHCommit.scala
@@ -0,0 +1,11 @@
+package com.igobrilhante.github.models
+
+import io.circe.{Decoder, Encoder}
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+
+case class GHCommit()
+
+object GHCommit {
+  implicit val decoder: Decoder[GHCommit] = deriveDecoder
+  implicit val encoder: Encoder[GHCommit] = deriveEncoder
+}
diff --git a/src/main/scala/com/igobrilhante/github/models/GHContributor.scala b/src/main/scala/com/igobrilhante/github/models/GHContributor.scala
new file mode 100644
index 0000000..bf98779
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/models/GHContributor.scala
@@ -0,0 +1,13 @@
+package com.igobrilhante.github.models
+
+import io.circe.{Decoder, Encoder}
+import io.circe.generic.semiauto._
+
+case class GHContributor(id: Long, login: String, contributions: Int)
+
+object GHContributor {
+
+  implicit val decoder: Decoder[GHContributor] = deriveDecoder
+  implicit val encoder: Encoder[GHContributor] = deriveEncoder
+
+}
diff --git a/src/main/scala/com/igobrilhante/github/models/GHOrganization.scala b/src/main/scala/com/igobrilhante/github/models/GHOrganization.scala
new file mode 100644
index 0000000..d048759
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/models/GHOrganization.scala
@@ -0,0 +1,15 @@
+package com.igobrilhante.github.models
+
+import io.circe.{Decoder, Encoder}
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+
+case class GHOrganization(id: Long, login: String, name: String, public_repos: Int, total_private_repos: Option[Int]) {
+
+  def total: Int = public_repos + total_private_repos.getOrElse(0)
+
+}
+
+object GHOrganization {
+  implicit val decoder: Decoder[GHOrganization] = deriveDecoder
+  implicit val encoder: Encoder[GHOrganization] = deriveEncoder
+}
diff --git a/src/main/scala/com/igobrilhante/github/models/GHRepository.scala b/src/main/scala/com/igobrilhante/github/models/GHRepository.scala
new file mode 100644
index 0000000..6babffe
--- /dev/null
+++ b/src/main/scala/com/igobrilhante/github/models/GHRepository.scala
@@ -0,0 +1,13 @@
+package com.igobrilhante.github.models
+
+import io.circe.{Decoder, Encoder}
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+
+case class GHRepository(id: Long, name: String, `private`: Boolean)
+
+object GHRepository {
+
+  implicit val decoder: Decoder[GHRepository] = deriveDecoder
+  implicit val encoder: Encoder[GHRepository] = deriveEncoder
+
+}
diff --git a/src/test/resources/application-test.conf b/src/test/resources/application-test.conf
new file mode 100644
index 0000000..7f76332
--- /dev/null
+++ b/src/test/resources/application-test.conf
@@ -0,0 +1,3 @@
+include "application"
+
+# default config for tests, we just import the regular conf
\ No newline at end of file
diff --git a/src/test/scala/com/igobrilhante/github/tests/GHServicePublicSpec.scala b/src/test/scala/com/igobrilhante/github/tests/GHServicePublicSpec.scala
new file mode 100644
index 0000000..0da2d1d
--- /dev/null
+++ b/src/test/scala/com/igobrilhante/github/tests/GHServicePublicSpec.scala
@@ -0,0 +1,43 @@
+package com.igobrilhante.github.tests
+
+import com.igobrilhante.github.api.GHService
+import com.igobrilhante.github.impl.GHServiceImpl
+
+class GHServicePublicSpec extends GHSpec {
+
+  val service: GHService = new GHServiceImpl()
+
+  val organizationId = "ScalaConsultants"
+  val publicRepo     = "lift-rest-demo"
+
+  "GHService Public Spec" should "get public repositories for ScalaConsultants" in {
+
+    val list = service.getRepositories("ScalaConsultants", page = 1).futureValue(timeout)
+
+    list should not be empty
+
+  }
+
+  it should s"get the organization '$organizationId'" in {
+    val org = service.getOrganization(organizationId).futureValue(timeout)
+
+    org.login shouldEqual organizationId
+
+  }
+
+  it should "get a list of contributors for public repo 'lift-rest-demo'" in {
+    val list = service.getContributors(organizationId, publicRepo).futureValue(timeout)
+
+    list should not be empty
+  }
+
+  it should s"get all repositories for $organizationId" in {
+    val org  = service.getOrganization(organizationId).futureValue(timeout)
+    val list = service.getAllRepositories(organizationId).futureValue(timeout)
+
+    list should have size org.total
+    list.filter(_.`private`) should have size org.total_private_repos.getOrElse(0).toLong
+    list.filterNot(_.`private`) should have size org.public_repos
+  }
+
+}
diff --git a/src/test/scala/com/igobrilhante/github/tests/GHSpec.scala b/src/test/scala/com/igobrilhante/github/tests/GHSpec.scala
new file mode 100644
index 0000000..0c17c26
--- /dev/null
+++ b/src/test/scala/com/igobrilhante/github/tests/GHSpec.scala
@@ -0,0 +1,35 @@
+package com.igobrilhante.github.tests
+
+import scala.concurrent.duration._
+import scala.language.postfixOps
+
+import akka.actor.testkit.typed.scaladsl.ActorTestKit
+import akka.actor.typed.ActorSystem
+import akka.http.scaladsl.testkit.ScalatestRouteTest
+
+import com.igobrilhante.GHSystem
+import org.scalatest.concurrent.PatienceConfiguration.Timeout
+import org.scalatest.concurrent.ScalaFutures
+import org.scalatest.flatspec.AsyncFlatSpec
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.{BeforeAndAfterAll, BeforeAndAfterEach}
+
+trait GHSpec
+    extends AsyncFlatSpec
+    with Matchers
+    with BeforeAndAfterEach
+    with BeforeAndAfterAll
+    with ScalaFutures
+    with ScalatestRouteTest {
+
+  val timeout              = Timeout(30 seconds)
+  val testKit              = ActorTestKit()
+  implicit val ec          = testKit.system.executionContext
+  implicit val actorSystem = ActorSystem.create(GHSystem(), "main")
+
+  override def afterAll(): Unit = {
+    actorSystem.terminate()
+    testKit.shutdownTestKit()
+  }
+
+}