diff --git a/jenkins-dendron-postgres.sh b/jenkins-dendron-postgres.sh
index e6e94cc8b..68912a896 100755
--- a/jenkins-dendron-postgres.sh
+++ b/jenkins-dendron-postgres.sh
@@ -4,62 +4,19 @@ set -eux
 
 : ${WORKSPACE:="$(pwd)"}
 
+export WORKSPACE
 export PYTHONDONTWRITEBYTECODE=yep
 export SYNAPSE_CACHE_FACTOR=1
 
-# Output test results as junit xml
-export TRIAL_FLAGS="--reporter=subunit"
-export TOXSUFFIX="| subunit-1to2 | subunit2junitxml --no-passthrough --output-to=results.xml"
-# Write coverage reports to a separate file for each process
-export COVERAGE_OPTS="-p"
-export DUMP_COVERAGE_COMMAND="coverage help"
-
-# Output flake8 violations to violations.flake8.log
-# Don't exit with non-0 status code on Jenkins,
-# so that the build steps continue and a later step can decided whether to
-# UNSTABLE or FAILURE this build.
-export PEP8SUFFIX="--output-file=violations.flake8.log || echo flake8 finished with status code \$?"
-
-rm .coverage* || echo "No coverage files to remove"
-
 ./jenkins/prepare_synapse.sh
-
 ./jenkins/clone.sh sytest https://github.com/matrix-org/sytest.git
 ./jenkins/clone.sh dendron https://github.com/matrix-org/dendron.git
+./dendron/jenkins/build_dendron.sh
+./sytest/jenkins/prep_sytest_for_postgres.sh
 
-: ${GOPATH:=${WORKSPACE}/.gopath}
-if [[ "${GOPATH}" != *:* ]]; then
-  mkdir -p "${GOPATH}"
-  export PATH="${GOPATH}/bin:${PATH}"
-fi
-export GOPATH
-
-cd dendron
-
-go get github.com/constabulary/gb/...
-gb generate
-gb build
-
-cd ../sytest
-
-: ${PORT_BASE:=20000}
-: ${PORT_COUNT=100}
-export PORT_BASE
-export PORT_COUNT
-
-./jenkins/prep_sytest_for_postgres.sh
-
-mkdir -p var
-
-echo >&2 "Running sytest with PostgreSQL";
-
-TOX_BIN=$WORKSPACE/.tox/py27/bin
-./jenkins/install_and_run.sh --python $TOX_BIN/python \
-                             --synapse-directory $WORKSPACE \
-                             --dendron $WORKSPACE/dendron/bin/dendron \
-                             --pusher \
-                             --synchrotron \
-                             --federation-reader \
-                             --port-range ${PORT_BASE}:$((PORT_BASE+PORT_COUNT-1))
-
-cd ..
+./sytest/jenkins/install_and_run.sh \
+    --synapse-directory $WORKSPACE \
+    --dendron $WORKSPACE/dendron/bin/dendron \
+    --pusher \
+    --synchrotron \
+    --federation-reader \
diff --git a/jenkins-postgres.sh b/jenkins-postgres.sh
index edf61a45b..f2ca8ccdf 100755
--- a/jenkins-postgres.sh
+++ b/jenkins-postgres.sh
@@ -4,50 +4,14 @@ set -eux
 
 : ${WORKSPACE:="$(pwd)"}
 
+export WORKSPACE
 export PYTHONDONTWRITEBYTECODE=yep
 export SYNAPSE_CACHE_FACTOR=1
 
-# Output test results as junit xml
-export TRIAL_FLAGS="--reporter=subunit"
-export TOXSUFFIX="| subunit-1to2 | subunit2junitxml --no-passthrough --output-to=results.xml"
-# Write coverage reports to a separate file for each process
-export COVERAGE_OPTS="-p"
-export DUMP_COVERAGE_COMMAND="coverage help"
-
-# Output flake8 violations to violations.flake8.log
-# Don't exit with non-0 status code on Jenkins,
-# so that the build steps continue and a later step can decided whether to
-# UNSTABLE or FAILURE this build.
-export PEP8SUFFIX="--output-file=violations.flake8.log || echo flake8 finished with status code \$?"
-
-rm .coverage* || echo "No coverage files to remove"
-
 ./jenkins/prepare_synapse.sh
-
 ./jenkins/clone.sh sytest https://github.com/matrix-org/sytest.git
 
-: ${PORT_BASE:=20000}
-: ${PORT_COUNT=100}
-export PORT_BASE
-export PORT_COUNT
+./sytest/jenkins/prep_sytest_for_postgres.sh
 
-cd sytest
-
-./jenkins/prep_sytest_for_postgres.sh
-
-echo >&2 "Running sytest with PostgreSQL";
-
-TOX_BIN=$WORKSPACE/.tox/py27/bin
-./jenkins/install_and_run.sh --coverage \
-                             --python $TOX_BIN/python \
-                             --synapse-directory $WORKSPACE \
-                             --port-range ${PORT_BASE}:$((PORT_BASE+PORT_COUNT-1))
-
-cd ..
-cp sytest/.coverage.* .
-
-# Combine the coverage reports
-echo "Combining:" .coverage.*
-$TOX_BIN/python -m coverage combine
-# Output coverage to coverage.xml
-$TOX_BIN/coverage xml -o coverage.xml
+./sytest/jenkins/install_and_run.sh \
+    --synapse-directory $WORKSPACE \
diff --git a/jenkins-sqlite.sh b/jenkins-sqlite.sh
index 1c3530ebb..84613d979 100755
--- a/jenkins-sqlite.sh
+++ b/jenkins-sqlite.sh
@@ -8,43 +8,8 @@ export WORKSPACE
 export PYTHONDONTWRITEBYTECODE=yep
 export SYNAPSE_CACHE_FACTOR=1
 
-# Output test results as junit xml
-export TRIAL_FLAGS="--reporter=subunit"
-export TOXSUFFIX="| subunit-1to2 | subunit2junitxml --no-passthrough --output-to=results.xml"
-# Write coverage reports to a separate file for each process
-export COVERAGE_OPTS="-p"
-export DUMP_COVERAGE_COMMAND="coverage help"
-
-# Output flake8 violations to violations.flake8.log
-# Don't exit with non-0 status code on Jenkins,
-# so that the build steps continue and a later step can decided whether to
-# UNSTABLE or FAILURE this build.
-export PEP8SUFFIX="--output-file=violations.flake8.log || echo flake8 finished with status code \$?"
-
-rm .coverage* || echo "No coverage files to remove"
-
 ./jenkins/prepare_synapse.sh
-
 ./jenkins/clone.sh sytest https://github.com/matrix-org/sytest.git
 
-: ${PORT_BASE:=20000}
-: ${PORT_COUNT=100}
-export PORT_BASE
-export PORT_COUNT
-
-cd sytest
-
-TOX_BIN=$WORKSPACE/.tox/py27/bin
-./jenkins/install_and_run.sh --coverage \
-                             --python $TOX_BIN/python \
-                             --synapse-directory $WORKSPACE \
-                             --port-range ${PORT_BASE}:$((PORT_BASE+PORT_COUNT-1)) \
-
-cd ..
-cp sytest/.coverage.* .
-
-# Combine the coverage reports
-echo "Combining:" .coverage.*
-$TOX_BIN/python -m coverage combine
-# Output coverage to coverage.xml
-$TOX_BIN/coverage xml -o coverage.xml
+./sytest/jenkins/install_and_run.sh \
+    --synapse-directory $WORKSPACE \
diff --git a/jenkins/clone.sh b/jenkins/clone.sh
index f56d076ea..ab30ac778 100755
--- a/jenkins/clone.sh
+++ b/jenkins/clone.sh
@@ -1,24 +1,44 @@
 #! /bin/bash
 
+# This clones a project from github into a named subdirectory
+# If the project has a branch with the same name as this branch
+# then it will checkout that branch after cloning.
+# Otherwise it will checkout "origin/develop."
+# The first argument is the name of the directory to checkout
+# the branch into.
+# The second argument is the URL of the remote repository to checkout.
+# Usually something like https://github.com/matrix-org/sytest.git
+
+set -eux
+
 NAME=$1
 PROJECT=$2
 BASE=".$NAME-base"
 
-# update our clone
-if [ ! -d .$NAME-base ]; then
-  git clone $PROJECT $BASE --mirror
+# Update our mirror.
+if [ ! -d ".$NAME-base" ]; then
+  # Create a local mirror of the source repository.
+  # This saves us from having to download the entire repository
+  # when this script is next run.
+  git clone "$PROJECT" "$BASE" --mirror
 else
-  (cd $BASE; git fetch -p)
+  # Fetch any updates from the source repository.
+  (cd "$BASE"; git fetch -p)
 fi
 
-rm -rf $NAME
-git clone $BASE $NAME --shared
+# Remove the existing repository so that we have a clean copy
+rm -rf "$NAME"
+# Cloning with --shared means that we will share portions of the
+# .git directory with our local mirror.
+git clone "$BASE" "$NAME" --shared
 
+# Jenkins may have supplied us with the name of the branch in the
+# environment. Otherwise we will have to guess based on the current
+# commit.
 : ${GIT_BRANCH:="origin/$(git rev-parse --abbrev-ref HEAD)"}
-cd $NAME
+cd "$NAME"
 # check out the relevant branch
 git checkout "${GIT_BRANCH}" || (
     echo >&2 "No ref ${GIT_BRANCH} found, falling back to develop"
     git checkout "origin/develop"
 )
-git clean -df .