diff --git a/substrate/scripts/ci/gitlab/pipeline/test.yml b/substrate/scripts/ci/gitlab/pipeline/test.yml
index d900d425ad..b2daf5bada 100644
--- a/substrate/scripts/ci/gitlab/pipeline/test.yml
+++ b/substrate/scripts/ci/gitlab/pipeline/test.yml
@@ -51,26 +51,6 @@ cargo-clippy:
     - SKIP_WASM_BUILD=1 env -u RUSTFLAGS cargo +nightly clippy --all-targets
     - rusty-cachier cache upload
 
-cargo-check-nixos:
-  stage:                           test
-  # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
-  needs:
-    - job:                         cargo-clippy
-      artifacts:                   false
-  extends:
-    - .docker-env
-    - .test-refs
-  before_script:                   []
-  # Don't use CI_IMAGE here because it breaks nightly checks of paritytech/ci-linux image
-  image:                           nixos/nix
-  variables:
-    SNAP:                          "DUMMY"
-    WS_API:                        "DUMMY"
-  script:
-    - nix-channel --update
-    - nix-shell shell.nix
-    - nix-shell --run "cargo check --workspace --all-targets --all-features"
-
 cargo-check-benches:
   stage:                           test
   variables:
@@ -337,6 +317,8 @@ test-linux-stable-int:
         time cargo test -p node-cli --release --verbose --locked -- --ignored
     - rusty-cachier cache upload
 
+# more information about this job can be found here:
+# https://github.com/paritytech/substrate/pull/6916
 check-tracing:
   stage:                           test
   # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
@@ -355,6 +337,8 @@ check-tracing:
     - time cargo +nightly test --manifest-path ./primitives/tracing/Cargo.toml --no-default-features --features=with-tracing
     - rusty-cachier cache upload
 
+# more information about this job can be found here:
+# https://github.com/paritytech/substrate/pull/3778
 test-full-crypto-feature:
   stage:                           test
   # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
diff --git a/substrate/shell.nix b/substrate/shell.nix
deleted file mode 100644
index c318995605..0000000000
--- a/substrate/shell.nix
+++ /dev/null
@@ -1,27 +0,0 @@
-let
-  mozillaOverlay =
-    import (builtins.fetchGit {
-      url = "https://github.com/mozilla/nixpkgs-mozilla.git";
-      rev = "15b7a05f20aab51c4ffbefddb1b448e862dccb7d";
-    });
-  nixpkgs = import <nixpkgs> { overlays = [ mozillaOverlay ]; };
-  rust-nightly = with nixpkgs; ((rustChannelOf { date = "2022-04-20"; channel = "nightly"; }).rust.override {
-    extensions = [ "rust-src" ];
-    targets = [ "wasm32-unknown-unknown" ];
-  });
-in
-with nixpkgs; pkgs.mkShell {
-  buildInputs = [
-    clang
-    openssl.dev
-    pkg-config
-    rust-nightly
-  ] ++ lib.optionals stdenv.isDarwin [
-    darwin.apple_sdk.frameworks.Security
-  ];
-
-  RUST_SRC_PATH = "${rust-nightly}/lib/rustlib/src/rust/src";
-  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
-  PROTOC = "${protobuf}/bin/protoc";
-  ROCKSDB_LIB_DIR = "${rocksdb}/lib";
-}