diff --git a/src/com/mirantis/mk/Gerrit.groovy b/src/com/mirantis/mk/Gerrit.groovy
index 33da618..b65432d 100644
--- a/src/com/mirantis/mk/Gerrit.groovy
+++ b/src/com/mirantis/mk/Gerrit.groovy
@@ -312,3 +312,74 @@
     }
     return dependentPatches
 }
+
+/**
+ * Find Gerrit change(s) according to various input parameters like owner, topic, etc.
+ * @param gerritAuth        A map containing information about Gerrit. Should include
+ *                          HOST, PORT and USER
+ * @param changeParams      Parameters to identify Geriit change e.g.: owner, topic,
+ *                          status, branch, project
+ */
+def findGerritChange(credentialsId, LinkedHashMap gerritAuth, LinkedHashMap changeParams) {
+    scriptText = """
+                 ssh -p ${gerritAuth['PORT']} ${gerritAuth['USER']}@${gerritAuth['HOST']} \
+                 gerrit query \
+                 --format JSON \
+                 """
+    changeParams.each {
+        scriptText += " ${it.key}:${it.value}"
+    }
+    scriptText += " | fgrep -v runTimeMilliseconds || :"
+    sshagent([credentialsId]) {
+        jsonChange = sh(
+             script:scriptText,
+             returnStdout: true,
+           ).trim()
+    }
+    return jsonChange
+}
+
+/**
+ * Download Gerrit review by number
+ *
+ * @param credentialsId            credentials ID
+ * @param virtualenv               virtualenv path
+ * @param repoDir                  repository directory
+ * @param gitRemote                the value of git remote
+ * @param changeNum                the number of change to download
+ */
+def getGerritChangeByNum(credentialsId, virtualEnv, repoDir, gitRemote, changeNum) {
+    def python = new com.mirantis.mk.Python()
+    sshagent([credentialsId]) {
+        dir(repoDir) {
+            python.runVirtualenvCommand(virtualEnv, "git review -r ${gitRemote} -d ${changeNum}")
+        }
+    }
+}
+
+/**
+ * Post Gerrit review
+ * @param credentialsId            credentials ID
+ * @param virtualenv               virtualenv path
+ * @param repoDir                  repository directory
+ * @param gitName                  committer name
+ * @param gitEmail                 committer email
+ * @param gitRemote                the value of git remote
+ * @param gitTopic                 the name of the topic
+ * @param gitBranch                the name of git branch
+ */
+def postGerritReview(credentialsId, virtualEnv, repoDir, gitName, gitEmail, gitRemote, gitTopic, gitBranch) {
+    def python = new com.mirantis.mk.Python()
+    def cmdText = """
+                    GIT_COMMITTER_NAME=${gitName} \
+                    GIT_COMMITTER_EMAIL=${gitEmail} \
+                    git review -r ${gitRemote} \
+                    -t ${gitTopic} \
+                    ${gitBranch}
+                  """
+    sshagent([credentialsId]) {
+        dir(repoDir) {
+            python.runVirtualenvCommand(virtualEnv, cmdText)
+        }
+    }
+}
diff --git a/src/com/mirantis/mk/Git.groovy b/src/com/mirantis/mk/Git.groovy
index 575fb80..d9006fa 100644
--- a/src/com/mirantis/mk/Git.groovy
+++ b/src/com/mirantis/mk/Git.groovy
@@ -100,13 +100,20 @@
  * @param path            Path to the git repository
  * @param message         A commit message
  * @param global          Use global config
+ * @param amend           Whether to use "--amend" in commit command
  */
-def commitGitChanges(path, message, gitEmail='jenkins@localhost', gitName='jenkins-slave', global=false) {
+def commitGitChanges(path, message, gitEmail='jenkins@localhost', gitName='jenkins-slave', global=false, amend=false) {
     def git_cmd
+    def gitOpts
     def global_arg = ''
     if (global) {
         global_arg = '--global'
     }
+    if (amend) {
+        gitOpts = '--amend'
+    } else {
+        gitOpts = ''
+    }
     dir(path) {
         sh "git config ${global_arg} user.email '${gitEmail}'"
         sh "git config ${global_arg} user.name '${gitName}'"
@@ -116,14 +123,13 @@
             returnStdout: true
         ).trim()
         git_cmd = sh(
-            script: "git commit -m '${message}'",
+            script: "git commit ${gitOpts} -m '${message}'",
             returnStdout: true
         ).trim()
     }
     return git_cmd
 }
 
-
 /**
  * Push git changes to remote repo
  *
@@ -231,4 +237,5 @@
                 returnStdout: true
         ).trim()
     return branchesList.tokenize('\n')
-}
\ No newline at end of file
+}
+