diff --git a/platform/extension/gitworkspace/local/BUILD.bazel b/platform/extension/gitworkspace/local/BUILD.bazel
index d080b538a..8fbc5d308 100644
--- a/platform/extension/gitworkspace/local/BUILD.bazel
+++ b/platform/extension/gitworkspace/local/BUILD.bazel
@@ -20,9 +20,19 @@ go_test(
         "local_test.go",
         "runtime_test.go",
     ],
+    data = [
+        "@git",
+        "@git//:templates",
+        "@git//:templates/description",
+    ],
     embed = [":go_default_library"],
+    env = {
+        "SUBMITQUEUE_TEST_GIT": "$(location @git//:git)",
+        "SUBMITQUEUE_TEST_GIT_TEMPLATE_DESCRIPTION": "$(location @git//:templates/description)",
+    },
     deps = [
         "//platform/extension/gitworkspace:go_default_library",
+        "//platform/git/exectest:go_default_library",
         "@com_github_stretchr_testify//assert:go_default_library",
         "@com_github_stretchr_testify//require:go_default_library",
     ],
diff --git a/platform/extension/gitworkspace/local/local.go b/platform/extension/gitworkspace/local/local.go
index 19f48dc9b..f9798ab10 100644
--- a/platform/extension/gitworkspace/local/local.go
+++ b/platform/extension/gitworkspace/local/local.go
@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"fmt"
 	"os/exec"
 	"strings"
 
@@ -30,29 +31,61 @@ import (
 // completion: one skipped after a failure, or one the OS could not start.
 const notRunExitCode = -1
 
+// gitBin is the Bin that the runtime and committer identity apply to.
+const gitBin = "git"
+
 // Params configures a local workspace factory.
 type Params struct {
 	// Dir is the path to the local git clone.
 	Dir string
+	// Runtime pins the executable, helper paths and scrubbed environment that
+	// git commands run on. When zero, git is resolved from PATH and inherits the
+	// caller's environment.
+	Runtime Runtime
+	// CommitterName and CommitterEmail identify the committer of every commit a
+	// git command creates. Set both or neither; when unset, the repository and
+	// environment configuration decide.
+	CommitterName  string
+	CommitterEmail string
 }
 
 type factory struct {
-	dir string
+	dir     string
+	runtime Runtime
+	// gitConfig is prepended to every git command's arguments.
+	gitConfig []string
 }
 
 // NewFactory creates a gitworkspace.Factory that runs commands as local
-// subprocesses in the given directory.
-func NewFactory(p Params) gitworkspace.Factory {
-	return &factory{dir: p.Dir}
+// subprocesses in the given directory. It fails when a set Runtime is invalid
+// or only half of the committer identity is set.
+func NewFactory(p Params) (gitworkspace.Factory, error) {
+	if p.Runtime.Executable != "" {
+		if err := p.Runtime.Validate(); err != nil {
+			return nil, err
+		}
+	}
+	if (p.CommitterName == "") != (p.CommitterEmail == "") {
+		return nil, fmt.Errorf("committer name and email must be set together")
+	}
+	f := &factory{dir: p.Dir, runtime: p.Runtime}
+	if p.CommitterName != "" {
+		f.gitConfig = []string{
+			"-c", "user.name=" + p.CommitterName,
+			"-c", "user.email=" + p.CommitterEmail,
+			"-c", "commit.gpgsign=false",
+		}
+	}
+	return f, nil
 }
 
 func (f *factory) For(ctx context.Context, _ string) (gitworkspace.Workspace, error) {
-	return &workspace{ctx: ctx, dir: f.dir}, nil
+	return &workspace{ctx: ctx, factory: f}, nil
 }
 
 type workspace struct {
 	ctx context.Context
-	dir string
+	*factory
 }
 
 func (w *workspace) Exec(commands []gitworkspace.Command) ([]gitworkspace.Output, error) {
@@ -74,9 +107,23 @@ func (w *workspace) Exec(commands []gitworkspace.Command) ([]gitworkspace.Output
 	return outputs, nil
 }
 
+func (w *workspace) command(cmd gitworkspace.Command) *exec.Cmd {
+	if cmd.Bin != gitBin {
+		c := exec.CommandContext(w.ctx, cmd.Bin, cmd.Args...)
+		c.Dir = w.dir
+		return c
+	}
+	args := append(append(make([]string, 0, len(w.gitConfig)+len(cmd.Args)), w.gitConfig...), cmd.Args...)
+	if w.runtime.Executable == "" {
+		c := exec.CommandContext(w.ctx, gitBin, args...)
+		c.Dir = w.dir
+		return c
+	}
+	return w.runtime.Command(w.ctx, w.dir, args...)
+}
+
 func (w *workspace) run(cmd gitworkspace.Command) gitworkspace.Output {
-	c := exec.CommandContext(w.ctx, cmd.Bin, cmd.Args...)
-	c.Dir = w.dir
+	c := w.command(cmd)
 	if cmd.Stdin != "" {
 		c.Stdin = strings.NewReader(cmd.Stdin)
 	}
diff --git a/platform/extension/gitworkspace/local/local_test.go b/platform/extension/gitworkspace/local/local_test.go
index de2cf04b6..25116dec3 100644
--- a/platform/extension/gitworkspace/local/local_test.go
+++ b/platform/extension/gitworkspace/local/local_test.go
@@ -16,17 +16,86 @@ package local
 
 import (
 	"context"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/uber/submitqueue/platform/extension/gitworkspace"
+	gitexectest "github.com/uber/submitqueue/platform/git/exectest"
 )
 
-func TestExec_Success(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
+func newWorkspace(t *testing.T, ctx context.Context, p Params) gitworkspace.Workspace {
+	t.Helper()
+	f, err := NewFactory(p)
+	require.NoError(t, err)
+	ws, err := f.For(ctx, "")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = ws.Close() })
+	return ws
+}
+
+func pinnedRuntime(t *testing.T) Runtime {
+	t.Helper()
+	executable := gitexectest.Git(t)
+	return Runtime{
+		Executable:  executable,
+		ExecPath:    filepath.Dir(executable),
+		TemplateDir: filepath.Dir(gitexectest.Runfile(t, "SUBMITQUEUE_TEST_GIT_TEMPLATE_DESCRIPTION")),
+	}
+}
+
+func TestNewFactory(t *testing.T) {
+	tests := []struct {
+		name    string
+		params  Params
+		wantErr bool
+	}{
+		{name: "directory only", params: Params{Dir: "/repo"}},
+		{name: "committer identity", params: Params{Dir: "/repo", CommitterName: "Runway", CommitterEmail: "runway@example.com"}},
+		{name: "committer name without email", params: Params{Dir: "/repo", CommitterName: "Runway"}, wantErr: true},
+		{name: "committer email without name", params: Params{Dir: "/repo", CommitterEmail: "runway@example.com"}, wantErr: true},
+		{name: "relative runtime path", params: Params{Dir: "/repo", Runtime: Runtime{Executable: "git", ExecPath: "/git-core", TemplateDir: "/templates"}}, wantErr: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := NewFactory(tt.params)
+			if tt.wantErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}
+
+func TestExec_GitRunsOnPinnedRuntimeAsCommitter(t *testing.T) {
+	// The ambient identity must not reach the commit: the pinned runtime scrubs
+	// the environment, so only the configured committer can be recorded.
+	t.Setenv("GIT_COMMITTER_NAME", "ambient")
+	dir := t.TempDir()
+	ws := newWorkspace(t, context.Background(), Params{
+		Dir:            dir,
+		Runtime:        pinnedRuntime(t),
+		CommitterName:  "Runway",
+		CommitterEmail: "runway@example.com",
+	})
+
+	outputs, err := ws.Exec([]gitworkspace.Command{
+		{Alias: "init", Bin: "git", Args: []string{"init", "-q", "-b", "main"}},
+		{Alias: "commit", Bin: "git", Args: []string{"commit", "-q", "--allow-empty", "-m", "seed", "--author", "Jane Dev <jane@example.com>"}},
+		{Alias: "idents", Bin: "git", Args: []string{"log", "-1", "--format=%an <%ae>|%cn <%ce>"}},
+	})
 	require.NoError(t, err)
-	defer ws.Close()
+	require.Len(t, outputs, 3)
+	for _, out := range outputs {
+		require.Equal(t, int32(0), out.ExitCode, "%s: %s", out.Alias, out.Stderr)
+	}
+	assert.Equal(t, "Jane Dev <jane@example.com>|Runway <runway@example.com>\n", outputs[2].Stdout)
+}
+
+func TestExec_Success(t *testing.T) {
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "echo", Bin: "echo", Args: []string{"hello"}},
@@ -39,9 +108,7 @@ func TestExec_Success(t *testing.T) {
 }
 
 func TestExec_MultipleCommands(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "first", Bin: "echo", Args: []string{"one"}},
@@ -56,9 +123,7 @@ func TestExec_MultipleCommands(t *testing.T) {
 }
 
 func TestExec_SkipsAfterFailure(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "ok", Bin: "echo", Args: []string{"fine"}},
@@ -76,11 +141,9 @@ func TestExec_SkipsAfterFailure(t *testing.T) {
 
 func TestExec_StatePersistsAcrossCalls(t *testing.T) {
 	dir := t.TempDir()
-	ws, err := NewFactory(Params{Dir: dir}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: dir})
 
-	_, err = ws.Exec([]gitworkspace.Command{
+	_, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "write", Bin: "sh", Args: []string{"-c", "echo content > testfile"}},
 	})
 	require.NoError(t, err)
@@ -95,9 +158,7 @@ func TestExec_StatePersistsAcrossCalls(t *testing.T) {
 }
 
 func TestExec_Stdin(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "cat", Bin: "cat", Stdin: "from stdin"},
@@ -109,9 +170,7 @@ func TestExec_Stdin(t *testing.T) {
 }
 
 func TestExec_Stderr(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "err", Bin: "sh", Args: []string{"-c", "echo oops >&2"}},
@@ -123,9 +182,7 @@ func TestExec_Stderr(t *testing.T) {
 }
 
 func TestExec_InvalidBinary(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec([]gitworkspace.Command{
 		{Alias: "bad", Bin: "nonexistent-binary-xyz"},
@@ -140,9 +197,7 @@ func TestExec_InvalidBinary(t *testing.T) {
 }
 
 func TestExec_EmptyBatch(t *testing.T) {
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(context.Background(), "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, context.Background(), Params{Dir: t.TempDir()})
 
 	outputs, err := ws.Exec(nil)
 	require.NoError(t, err)
@@ -151,9 +206,7 @@ func TestExec_EmptyBatch(t *testing.T) {
 
 func TestExec_CancelledContextStopsCommands(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
-	ws, err := NewFactory(Params{Dir: t.TempDir()}).For(ctx, "")
-	require.NoError(t, err)
-	defer ws.Close()
+	ws := newWorkspace(t, ctx, Params{Dir: t.TempDir()})
 
 	cancel()
 	outputs, err := ws.Exec([]gitworkspace.Command{
diff --git a/service/submitqueue/orchestrator/server/profiles.go b/service/submitqueue/orchestrator/server/profiles.go
index e2ad5b718..c760bfbed 100644
--- a/service/submitqueue/orchestrator/server/profiles.go
+++ b/service/submitqueue/orchestrator/server/profiles.go
@@ -784,7 +784,11 @@ func (b *profileBuilder) newTangoAnalyzerFactory(key tangoAnalyzerKey, where str
 type cloneWorkspaces struct{}
 
 func (cloneWorkspaces) For(ctx context.Context, repo string) (gitworkspace.Workspace, error) {
-	return gitworkspacelocal.NewFactory(gitworkspacelocal.Params{Dir: repo}).For(ctx, repo)
+	f, err := gitworkspacelocal.NewFactory(gitworkspacelocal.Params{Dir: repo})
+	if err != nil {
+		return nil, err
+	}
+	return f.For(ctx, repo)
 }
 
 // pathOverlapKey maps the configured granularity onto the projection the