diff --git a/taskcluster/ci/build/kind.yml b/taskcluster/ci/build/kind.yml
deleted file mode 100644
index 1c1f199f6d..0000000000
--- a/taskcluster/ci/build/kind.yml
+++ /dev/null
@@ -1,222 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-loader: taskgraph.loader.transform:loader
-
-transforms:
-    - fenix_taskgraph.transforms.build:transforms
-    - taskgraph.transforms.job:transforms
-    - taskgraph.transforms.task:transforms
-
-kind-dependencies:
-    - toolchain
-
-
-task-defaults:
-    # Builds generate multiple APKs with different ABIs. For each APK described
-    # by `gradlew printVariant`, an artifact will be generated. `variant` and
-    # the per-apk config from `printVariant` can be used as substitutions in
-    # `name` and `path`.
-    apk-artifact-template:
-        type: file
-        name: public/build/{abi}/target.apk
-        github-name: 'fenix-{version}-{abi}.apk'
-        path: '/builds/worker/checkouts/vcs/app/build/outputs/apk/{gradle_build_type}/{fileName}'
-    description: Build Fenix from source code.
-    fetches:
-        toolchain:
-            - android-sdk-linux
-            - android-gradle-dependencies
-    run:
-        using: gradlew
-        use-caches: false
-    run-on-tasks-for: []
-    treeherder:
-        kind: build
-        symbol: B
-        platform: android-all/opt
-        tier: 1
-    worker-type: b-android
-    worker:
-        docker-image: {in-tree: base}
-        max-run-time: 7200
-        chain-of-trust: true
-
-
-tasks:
-    debug:
-        attributes:
-            code-review: true
-        run-on-tasks-for: [github-pull-request, github-push]
-        run:
-            gradle-build-type: debug
-            track-apk-size: true
-        treeherder:
-            symbol: debug(B)
-
-    beta-firebase:
-        disable-optimization: true
-        run-on-tasks-for: [github-push] # We want this on push so that we detect problem before triggering a new beta
-        run:
-            gradle-build-type: beta
-            test-build-type: beta
-        treeherder:
-            symbol: beta(Bf)
-
-    nightly-firebase:
-        disable-optimization: true
-        run-on-tasks-for: [github-push] # We want this on push so that we detect problem before triggering a new nightly
-        run:
-            gradle-build-type: nightly
-            test-build-type: nightly
-        treeherder:
-            symbol: nightly(Bf)
-
-    android-test-debug:
-        attributes:
-            code-review: true
-        run-on-tasks-for: [github-pull-request, github-push]
-        run:
-            gradle-build-type: androidTest
-        apk-artifact-template:
-            # 2 differences here: "androidTest/" is added and "{gradle_build_type}" is forced to "debug"
-            path: '/builds/worker/checkouts/vcs/app/build/outputs/apk/androidTest/debug/{fileName}'
-        treeherder:
-            symbol: debug(Bat)
-
-    # android-test-nightly and android-test-beta, while still being debug builds, are meant to be signed
-    # with the nightly/beta key. The Firebase testing infrastructure requires both the androidTest APK
-    # and the APK under test to be signed with the same key. Thus, the nightly APK being signed with
-    # nightly means we need an androidTest APK with the same signature.
-    #
-    # TODO: See if we can tweak the signing kind to make 2 signing jobs out of a single `android-test`
-    # job.
-    android-test-nightly:
-        attributes:
-            nightly: true
-        apk-artifact-template:
-            # 2 differences here:
-            #  * "androidTest/" is added
-            #  * "{gradle_build_type}" is forced to "debug"
-            path: '/builds/worker/checkouts/vcs/app/build/outputs/apk/androidTest/nightly/app-nightly-androidTest.apk'
-        disable-optimization: true
-        run:
-            gradle-build-type: androidTest
-            test-build-type: nightly
-        run-on-tasks-for: [github-push]
-        treeherder:
-            symbol: nightly(Bat)
-
-    android-test-beta:
-        apk-artifact-template:
-            # 3 differences here:
-            #  * "androidTest/" is added
-            #  * "{gradle_build_type}" is forced to "beta"
-            #  * "{fileName}" is forced to "app-beta-androidTest.apk"
-            path: '/builds/worker/checkouts/vcs/app/build/outputs/apk/androidTest/beta/app-beta-androidTest.apk'
-        disable-optimization: true
-        run:
-            gradle-build-type: androidTest
-            test-build-type: beta
-        run-on-tasks-for: [github-push] # We want this on push so that we detect problem before triggering a new beta
-        treeherder:
-            symbol: beta(Bat)
-
-    android-test-mozillaonline:
-        apk-artifact-template:
-            # 3 differences here:
-            #  * "androidTest/" is added
-            #  * "{gradle_build_type}" is forced to "beta"
-            #  * "{fileName}" is forced to "app-beta-androidTest.apk"
-            path: '/builds/worker/checkouts/vcs/app/build/outputs/apk/androidTest/beta/app-beta-androidTest.apk'
-        disable-optimization: true
-        run:
-            gradle-build-type: androidTest
-            gradle-extra-options:
-                - -PmozillaOnline
-            test-build-type: beta
-        run-on-tasks-for: [github-push] # We want this on push so that we detect problem before triggering a new beta
-        treeherder:
-            symbol: beta(Bat-mo)
-
-    nightly-simulation:
-        attributes:
-            nightly: false
-        run-on-tasks-for: [github-push]
-        include-nightly-version: true
-        include-shippable-secrets: true
-        run:
-            gradle-build-type: nightly
-        treeherder:
-            symbol: nightlySim(B)
-
-    nightly:
-        attributes:
-            nightly: true
-        include-nightly-version: true
-        include-shippable-secrets: true
-        run:
-            gradle-build-type: nightly
-            track-apk-size: true
-        run-on-tasks-for: []
-        treeherder:
-            symbol: nightly(B)
-
-    beta:
-        attributes:
-            release-type: beta
-            shipping_phase: promote
-        include-release-version: true
-        include-shippable-secrets: true
-        filter-incomplete-translations: true
-        run:
-            gradle-build-type: beta
-            track-apk-size: true
-        treeherder:
-            symbol: beta(B)
-
-    beta-mozillaonline:
-        apk-artifact-template:
-            github-name: 'fenix-mozillaonline-{version}-{abi}.apk'
-        attributes:
-            release-type: beta
-            shipping_phase: promote
-        include-release-version: true
-        include-shippable-secrets: true
-        filter-incomplete-translations: true
-        run:
-            gradle-build-type: beta
-            gradle-extra-options:
-                - -PmozillaOnline
-        treeherder:
-            symbol: beta(Bmo)
-
-    release:
-        attributes:
-            release-type: release
-            shipping_phase: promote
-        include-release-version: true
-        include-shippable-secrets: true
-        filter-incomplete-translations: true
-        run:
-            gradle-build-type: release
-            track-apk-size: true
-        treeherder:
-            symbol: release(B)
-
-    release-mozillaonline:
-        apk-artifact-template:
-            github-name: 'fenix-mozillaonline-{version}-{abi}.apk'
-        attributes:
-            release-type: release
-            shipping_phase: promote
-        include-release-version: true
-        include-shippable-secrets: true
-        filter-incomplete-translations: true
-        run:
-            gradle-build-type: release
-            gradle-extra-options:
-                - -PmozillaOnline
-        treeherder:
-            symbol: release(Bmo)
diff --git a/taskcluster/fenix_taskgraph/gradle.py b/taskcluster/fenix_taskgraph/gradle.py
deleted file mode 100644
index 76b72e45fa..0000000000
--- a/taskcluster/fenix_taskgraph/gradle.py
+++ /dev/null
@@ -1,58 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-import json
-import subprocess
-
-from taskgraph.util.memoize import memoize
-
-
-def get_variant(build_type):
-    all_variants = _fetch_all_variants()
-    matching_variants = [
-        variant for variant in all_variants if variant["build_type"] == build_type
-    ]
-    number_of_matching_variants = len(matching_variants)
-    if number_of_matching_variants == 0:
-        raise ValueError('No variant found for build type "{}"'.format(build_type))
-    elif number_of_matching_variants > 1:
-        raise ValueError(
-            'Too many variants found for build type "{}"": {}'.format(
-                build_type, matching_variants
-            )
-        )
-
-    return matching_variants.pop()
-
-
-@memoize
-def _fetch_all_variants():
-    output = _run_gradle_process("printVariants")
-    content = _extract_content_from_command_output(output, prefix="variants: ")
-    return json.loads(content)
-
-
-def _run_gradle_process(gradle_command, **kwargs):
-    gradle_properties = [
-        "-P{property_name}={value}".format(property_name=property_name, value=value)
-        for property_name, value in kwargs.items()
-    ]
-
-    process = subprocess.Popen(
-        ["./gradlew", "--no-daemon", "--quiet", gradle_command] + gradle_properties,
-        stdout=subprocess.PIPE,
-        universal_newlines=True,
-    )
-    output, err = process.communicate()
-    exit_code = process.wait()
-
-    if exit_code != 0:
-        raise RuntimeError("Gradle command returned error: {}".format(exit_code))
-
-    return output
-
-
-def _extract_content_from_command_output(output, prefix):
-    variants_line = [line for line in output.split("\n") if line.startswith(prefix)][0]
-    return variants_line.split(" ", 1)[1]
diff --git a/taskcluster/fenix_taskgraph/transforms/build.py b/taskcluster/fenix_taskgraph/transforms/build.py
deleted file mode 100644
index 81aa5720ac..0000000000
--- a/taskcluster/fenix_taskgraph/transforms/build.py
+++ /dev/null
@@ -1,199 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-"""
-Apply some defaults and minor modifications to the jobs defined in the build
-kind.
-"""
-
-from taskgraph.transforms.base import TransformSequence
-from fenix_taskgraph.gradle import get_variant
-
-
-transforms = TransformSequence()
-
-
-@transforms.add
-def add_variant_config(config, tasks):
-    for task in tasks:
-        attributes = task.setdefault("attributes", {})
-        if not attributes.get("build-type"):
-            attributes["build-type"] = task["name"]
-
-        yield task
-
-
-@transforms.add
-def add_shippable_secrets(config, tasks):
-    for task in tasks:
-        secrets = task["run"].setdefault("secrets", [])
-        dummy_secrets = task["run"].setdefault("dummy-secrets", [])
-
-        if (
-            task.pop("include-shippable-secrets", False)
-            and config.params["level"] == "3"
-        ):
-            build_type = task["attributes"]["build-type"]
-            gradle_build_type = task["run"]["gradle-build-type"]
-            secret_index = "project/mobile/fenix/{}".format(build_type)
-            secrets.extend(
-                [
-                    {
-                        "key": key,
-                        "name": secret_index,
-                        "path": target_file,
-                    }
-                    for key, target_file in (
-                        ("adjust", ".adjust_token"),
-                        (
-                            "firebase",
-                            "app/src/{}/res/values/firebase.xml".format(
-                                gradle_build_type
-                            ),
-                        ),
-                        ("sentry_dsn", ".sentry_token"),
-                        ("mls", ".mls_token"),
-                        ("nimbus_url", ".nimbus"),
-                        ("wallpaper_url", ".wallpaper_url"),
-                        ("pocket_consumer_key", ".pocket_consumer_key"),
-                    )
-                ]
-            )
-        else:
-            dummy_secrets.extend(
-                [
-                    {
-                        "content": fake_value,
-                        "path": target_file,
-                    }
-                    for fake_value, target_file in (
-                        ("faketoken", ".adjust_token"),
-                        ("faketoken", ".mls_token"),
-                        ("https://fake@sentry.prod.mozaws.net/368", ".sentry_token"),
-                    )
-                ]
-            )
-
-        yield task
-
-
-@transforms.add
-def build_gradle_command(config, tasks):
-    for task in tasks:
-        gradle_build_type = task["run"]["gradle-build-type"]
-        variant_config = get_variant(gradle_build_type)
-
-        task["run"]["gradlew"] = [
-            "clean",
-            "assemble{}".format(variant_config["name"].capitalize()),
-        ]
-
-        yield task
-
-
-@transforms.add
-def track_apk_size(config, tasks):
-    for task in tasks:
-        gradle_build_type = task["run"]["gradle-build-type"]
-        variant_config = get_variant(gradle_build_type)
-
-        should_track_apk_size = task["run"].pop("track-apk-size", False)
-        if should_track_apk_size:
-            task["run"]["gradlew"].append(
-                "apkSize{}".format(variant_config["name"].capitalize())
-            )
-
-        yield task
-
-
-@transforms.add
-def extra_gradle_options(config, tasks):
-    for task in tasks:
-        for extra in task["run"].pop("gradle-extra-options", []):
-            task["run"]["gradlew"].append(extra)
-
-        yield task
-
-
-@transforms.add
-def add_test_build_type(config, tasks):
-    for task in tasks:
-        test_build_type = task["run"].pop("test-build-type", "")
-        if test_build_type:
-            task["run"]["gradlew"].append("-PtestBuildType={}".format(test_build_type))
-        yield task
-
-
-@transforms.add
-def add_disable_optimization(config, tasks):
-    for task in tasks:
-        if task.pop("disable-optimization", False):
-            task["run"]["gradlew"].append("-PdisableOptimization")
-        yield task
-
-
-@transforms.add
-def add_nightly_version(config, tasks):
-    for task in tasks:
-        if task.pop("include-nightly-version", False):
-            task["run"]["gradlew"].extend(
-                [
-                    # We only set the `official` flag here. The actual version name will be determined
-                    # by Gradle (depending on the Gecko/A-C version being used)
-                    "-Pofficial"
-                ]
-            )
-        yield task
-
-
-@transforms.add
-def add_release_version(config, tasks):
-    for task in tasks:
-        if task.pop("include-release-version", False):
-            task["run"]["gradlew"].extend(
-                ["-PversionName={}".format(config.params["version"]), "-Pofficial"]
-            )
-        yield task
-
-
-@transforms.add
-def add_artifacts(config, tasks):
-    for task in tasks:
-        gradle_build_type = task["run"].pop("gradle-build-type")
-        variant_config = get_variant(gradle_build_type)
-        artifacts = task.setdefault("worker", {}).setdefault("artifacts", [])
-        task["attributes"]["apks"] = apks = {}
-
-        if "apk-artifact-template" in task:
-            artifact_template = task.pop("apk-artifact-template")
-            for apk in variant_config["apks"]:
-                apk_name = artifact_template["name"].format(**apk)
-                artifacts.append(
-                    {
-                        "type": artifact_template["type"],
-                        "name": apk_name,
-                        "path": artifact_template["path"].format(
-                            gradle_build_type=gradle_build_type, **apk
-                        ),
-                    }
-                )
-                apks[apk["abi"]] = {
-                    "name": apk_name,
-                    "github-name": artifact_template["github-name"].format(
-                        version=config.params["version"], **apk
-                    ),
-                }
-
-        yield task
-
-
-@transforms.add
-def filter_incomplete_translation(config, tasks):
-    for task in tasks:
-        if task.pop("filter-incomplete-translations", False):
-            # filter-release-translations modifies source, which could cause problems if we ever start caching source
-            pre_gradlew = task["run"].setdefault("pre-gradlew", [])
-            pre_gradlew.append(
-                ["python", "automation/taskcluster/l10n/filter-release-translations.py"]
-            )
-        yield task