diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index 0d44987be3..c07ff6af9b 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -91,6 +91,7 @@ embedding = ["windmill-api/embedding"]
 parquet = ["windmill-api/parquet", "windmill-common/parquet", "windmill-worker/parquet", "dep:object_store"]
 prometheus = ["windmill-common/prometheus", "windmill-api/prometheus", "windmill-worker/prometheus", "windmill-queue/prometheus", "dep:prometheus"]
 flow_testing = ["windmill-worker/flow_testing"]
+quickjs = ["windmill-worker/quickjs", "windmill-api/quickjs"]
 openidconnect = ["windmill-api/openidconnect", "windmill-common/openidconnect"]
 cloud = ["windmill-queue/cloud", "windmill-worker/cloud", "windmill-common/cloud", "windmill-api/cloud"]
 jemalloc = ["windmill-common/jemalloc", "dep:tikv-jemallocator", "dep:tikv-jemalloc-sys", "dep:tikv-jemalloc-ctl"]
@@ -145,7 +146,8 @@ oss_core = [
     "embedding", "parquet", "openidconnect", "license",
     "http_trigger", "zip", "oauth2", "postgres_trigger",
     "mqtt_trigger", "websocket", "smtp", "native_trigger",
-    "static_frontend", "mcp", "bedrock", "inline_preview"
+    "static_frontend", "mcp", "bedrock", "inline_preview",
+    "quickjs"
 ]
 ce_core = ["oss_core", "private"]
 ee_core = [
diff --git a/backend/windmill-api/Cargo.toml b/backend/windmill-api/Cargo.toml
index 8e3c7d2818..bbf1492d84 100644
--- a/backend/windmill-api/Cargo.toml
+++ b/backend/windmill-api/Cargo.toml
@@ -11,7 +11,7 @@ path = "src/lib.rs"
 [features]
 default = []
 private = ["windmill-audit/private", "windmill-common/private", "windmill-api-auth/private", "windmill-store/private", "windmill-api-users/private", "windmill-api-workspaces/private", "windmill-api-groups/private", "windmill-trigger-kafka?/private", "windmill-trigger-postgres?/private", "windmill-trigger-mqtt?/private", "windmill-trigger-websocket?/private", "windmill-trigger-nats?/private", "windmill-trigger-sqs?/private", "windmill-trigger-gcp?/private", "windmill-trigger-email?/private"]
-enterprise = ["windmill-queue/enterprise", "windmill-audit/enterprise", "windmill-git-sync/enterprise", "windmill-common/enterprise", "windmill-worker?/enterprise", "windmill-api-auth/enterprise", "windmill-store/enterprise", "windmill-api-jobs/enterprise", "windmill-api-scripts/enterprise", "windmill-api-users/enterprise", "windmill-api-workspaces/enterprise", "windmill-api-groups/enterprise", "windmill-trigger/enterprise", "windmill-trigger-kafka?/enterprise", "windmill-trigger-postgres?/enterprise", "windmill-trigger-mqtt?/enterprise", "windmill-trigger-websocket?/enterprise", "windmill-trigger-email?/enterprise", "windmill-trigger-nats?/enterprise", "windmill-trigger-sqs?/enterprise", "windmill-trigger-gcp?/enterprise", "windmill-trigger-http?/enterprise", "windmill-native-triggers?/enterprise"]
+enterprise = ["windmill-queue/enterprise", "windmill-audit/enterprise", "windmill-git-sync/enterprise", "windmill-common/enterprise", "windmill-worker?/enterprise", "windmill-api-auth/enterprise", "windmill-store/enterprise", "windmill-api-jobs/enterprise", "windmill-api-scripts/enterprise", "windmill-api-users/enterprise", "windmill-api-workspaces/enterprise", "windmill-api-groups/enterprise", "windmill-trigger/enterprise", "windmill-trigger-kafka?/enterprise", "windmill-trigger-postgres?/enterprise", "windmill-trigger-mqtt?/enterprise", "windmill-trigger-websocket?/enterprise", "windmill-trigger-email?/enterprise", "windmill-trigger-nats?/enterprise", "windmill-trigger-sqs?/enterprise", "windmill-trigger-gcp?/enterprise", "windmill-trigger-http?/enterprise", "windmill-native-triggers?/enterprise", "dep:windmill-autoscaling", "windmill-autoscaling/enterprise"]
 stripe = []
 inline_preview = ["dep:windmill-worker"]
 agent_worker_server = ["dep:windmill-worker"]
@@ -42,6 +42,7 @@ mcp = ["dep:windmill-mcp", "windmill-mcp/server", "windmill-mcp/auth", "windmill
 bedrock = ["dep:aws-sdk-bedrock", "dep:aws-sdk-bedrockruntime", "windmill-common/bedrock", "dep:aws-config", "dep:aws-credential-types", "dep:aws-smithy-types"]
 python = ["windmill-dep-map/python", "dep:windmill-parser-py", "dep:windmill-parser-py-imports", "windmill-api-scripts/python", "windmill-trigger/python", "windmill-common/python"]
 no_auth = ["windmill-api-auth/no_auth", "windmill-store/no_auth", "windmill-api-users/no_auth"]
+quickjs = ["windmill-jseval/quickjs"]
 
 [dependencies]
 windmill-mcp = { workspace = true, optional = true }
@@ -64,7 +65,7 @@ windmill-parser-py = { workspace = true, optional = true }
 windmill-parser-py-imports = { workspace = true, optional = true }
 windmill-git-sync.workspace = true
 windmill-indexer = { workspace = true, optional = true }
-windmill-autoscaling.workspace = true
+windmill-autoscaling = { workspace = true, optional = true }
 windmill-worker = { workspace = true, optional = true }
 windmill-dep-map.workspace = true
 tokio.workspace = true
diff --git a/backend/windmill-jseval/Cargo.toml b/backend/windmill-jseval/Cargo.toml
index 076f1329f3..b2f7217404 100644
--- a/backend/windmill-jseval/Cargo.toml
+++ b/backend/windmill-jseval/Cargo.toml
@@ -10,10 +10,11 @@ path = "src/lib.rs"
 
 [features]
 default = []
+quickjs = ["dep:rquickjs"]
 
 [dependencies]
 windmill-common = { workspace = true, default-features = false }
-rquickjs.workspace = true
+rquickjs = { workspace = true, optional = true }
 serde_json.workspace = true
 tokio.workspace = true
 tracing.workspace = true
diff --git a/backend/windmill-jseval/src/lib.rs b/backend/windmill-jseval/src/lib.rs
index 34fdb62ee5..92024395c5 100644
--- a/backend/windmill-jseval/src/lib.rs
+++ b/backend/windmill-jseval/src/lib.rs
@@ -21,6 +21,7 @@ use std::sync::Arc;
 
 use lazy_static::lazy_static;
 use regex::Regex;
+#[cfg(feature = "quickjs")]
 use rquickjs::{
     async_with,
     prelude::{Async, Func, MutFn},
@@ -63,8 +64,9 @@ lazy_static! {
     .unwrap();
 }
 
-// ── Shared helper functions ───────────────────────────────────────────
+// ── Shared helper functions (quickjs-only) ──────────────────────────
 
+#[cfg(feature = "quickjs")]
 pub fn replace_with_await(expr: String, fn_name: &str) -> String {
     let sep = format!("{}(", fn_name);
     let mut split = expr.split(&sep);
@@ -75,10 +77,12 @@ pub fn replace_with_await(expr: String, fn_name: &str) -> String {
     s
 }
 
+#[cfg(feature = "quickjs")]
 pub fn replace_with_await_result(expr: String) -> String {
     RE.replace_all(&expr, "(await $r)").to_string()
 }
 
+#[cfg(feature = "quickjs")]
 fn add_closing_bracket(s: &str) -> String {
     let mut s = s.to_string();
     let mut level = 1;
@@ -194,23 +198,20 @@ pub async fn handle_full_regex(
     return None;
 }
 
+#[cfg(feature = "quickjs")]
 use windmill_common::utils::unsafe_raw;
 
 // ── QuickJS evaluation ───────────────────────────────────────────────
 
+#[cfg(feature = "quickjs")]
+
 /// Shared state for async operations within QuickJS
 #[derive(Clone)]
 struct AsyncOpState {
     client: AuthedClient,
 }
 
-/// Evaluates a JavaScript expression using QuickJS runtime.
-///
-/// This function provides flow expression evaluation using QuickJS
-/// instead of deno_core/V8 for significantly faster startup times.
-///
-/// Unlike deno_core, this uses true async Rust callbacks for `variable()`,
-/// `resource()`, and `results.xxx` access - no pre-fetching required.
+#[cfg(feature = "quickjs")]
 pub async fn eval_timeout_quickjs(
     expr: String,
     transform_context: HashMap<String, Arc<Box<RawValue>>>,
@@ -301,9 +302,10 @@ pub async fn eval_timeout_quickjs(
     })??
 }
 
-/// Memory limit for QuickJS runtime (32MB).
+#[cfg(feature = "quickjs")]
 const QUICKJS_MEMORY_LIMIT: usize = 32 * 1024 * 1024;
 
+#[cfg(feature = "quickjs")]
 async fn eval_quickjs_inner(
     expr: &str,
     transform_context: HashMap<String, Arc<Box<RawValue>>>,
@@ -441,7 +443,7 @@ async fn eval_quickjs_inner(
     .await
 }
 
-/// Set up async variable() and resource() functions using true Rust async callbacks.
+#[cfg(feature = "quickjs")]
 fn setup_async_ops<'js>(
     ctx: &rquickjs::Ctx<'js>,
     globals: &Object<'js>,
@@ -509,7 +511,7 @@ fn setup_async_ops<'js>(
     Ok(())
 }
 
-/// Set up stub functions that throw errors when no client is available
+#[cfg(feature = "quickjs")]
 fn setup_stub_functions<'js>(
     ctx: &rquickjs::Ctx<'js>,
     _globals: &Object<'js>,
@@ -531,7 +533,7 @@ fn setup_stub_functions<'js>(
     Ok(())
 }
 
-/// Set up the `results` Proxy object with dynamic access to step results.
+#[cfg(feature = "quickjs")]
 fn setup_results_proxy<'js>(
     ctx: &rquickjs::Ctx<'js>,
     globals: &Object<'js>,
@@ -657,7 +659,7 @@ fn setup_results_proxy<'js>(
     Ok(())
 }
 
-/// Convert a serde_json::Value to a QuickJS Value
+#[cfg(feature = "quickjs")]
 fn json_to_js<'js>(
     ctx: &rquickjs::Ctx<'js>,
     val: &serde_json::Value,
@@ -696,6 +698,7 @@ fn json_to_js<'js>(
     }
 }
 
+#[cfg(feature = "quickjs")]
 fn should_add_return_quickjs(expr: &str) -> bool {
     let trimmed = expr.trim();
 
@@ -741,6 +744,7 @@ fn should_add_return_quickjs(expr: &str) -> bool {
     true
 }
 
+#[cfg(feature = "quickjs")]
 fn contains_semicolon_outside_strings(expr: &str) -> bool {
     let mut in_single_quote = false;
     let mut in_double_quote = false;
@@ -769,14 +773,14 @@ fn contains_semicolon_outside_strings(expr: &str) -> bool {
     false
 }
 
+#[cfg(feature = "quickjs")]
 fn quickjs_error_to_anyhow(err: rquickjs::CaughtError<'_>) -> anyhow::Error {
     anyhow::anyhow!("QuickJS evaluation error: {}", err)
 }
 
 // ── eval_simple_js for windmill-api batch rerun ──────────────────────
 
-/// Evaluate a JS expression with named JSON globals in scope.
-/// Used by windmill-api for batch rerun arg transforms.
+#[cfg(feature = "quickjs")]
 pub async fn eval_simple_js(
     expr: String,
     globals: HashMap<String, serde_json::Value>,
@@ -819,9 +823,32 @@ pub async fn eval_simple_js(
     })??
 }
 
+// ── Fallback stubs when quickjs is disabled ──────────────────────────
+
+#[cfg(not(feature = "quickjs"))]
+pub async fn eval_timeout_quickjs(
+    _expr: String,
+    _transform_context: HashMap<String, Arc<Box<RawValue>>>,
+    _flow_input: Option<mappable_rc::Marc<HashMap<String, Box<RawValue>>>>,
+    _flow_env: Option<&HashMap<String, Box<RawValue>>>,
+    _authed_client: Option<&windmill_common::client::AuthedClient>,
+    _by_id: Option<&IdContext>,
+    _ctx: Option<Vec<(String, String)>>,
+) -> anyhow::Result<Box<RawValue>> {
+    anyhow::bail!("quickjs feature is not enabled")
+}
+
+#[cfg(not(feature = "quickjs"))]
+pub async fn eval_simple_js(
+    _expr: String,
+    _globals: HashMap<String, serde_json::Value>,
+) -> anyhow::Result<Box<RawValue>> {
+    anyhow::bail!("quickjs feature is not enabled")
+}
+
 // ── Tests ────────────────────────────────────────────────────────────
 
-#[cfg(test)]
+#[cfg(all(test, feature = "quickjs"))]
 mod tests {
     use super::*;
     use serde_json::json;
diff --git a/backend/windmill-worker/Cargo.toml b/backend/windmill-worker/Cargo.toml
index 619d092c7e..d95321dd77 100644
--- a/backend/windmill-worker/Cargo.toml
+++ b/backend/windmill-worker/Cargo.toml
@@ -13,7 +13,7 @@ default = []
 private = []
 mcp = ["dep:windmill-mcp"]
 prometheus = ["dep:prometheus", "windmill-common/prometheus"]
-enterprise = ["windmill-queue/enterprise", "windmill-git-sync/enterprise", "windmill-common/enterprise", "dep:pem", "dep:tokio-util"]
+enterprise = ["windmill-queue/enterprise", "windmill-git-sync/enterprise", "windmill-common/enterprise", "dep:pem", "dep:tokio-util", "dep:opentelemetry-proto", "dep:prost", "dep:hudsucker", "dep:rcgen", "dep:hyper-http-proxy", "dep:hyper-tls", "dep:hyper-util"]
 mssql = ["dep:tiberius"]
 mssql-kerberos = ["mssql", "tiberius/integrated-auth-gssapi"]  # Linux/Unix integrated auth
 mssql-winauth = ["mssql", "tiberius/winauth"]  # Windows integrated auth
@@ -37,6 +37,7 @@ nu = ["dep:windmill-parser-nu"]
 java = ["dep:windmill-parser-java"]
 ruby = ["dep:windmill-parser-ruby"]
 duckdb = ["dep:libloading"]
+quickjs = ["windmill-jseval/quickjs"]
 bedrock = ["dep:aws-sdk-bedrockruntime", "windmill-common/bedrock", "dep:aws-config", "dep:aws-credential-types", "dep:aws-smithy-types"]
 
 [dependencies]
@@ -127,18 +128,18 @@ process-wrap.workspace = true
 async-once-cell.workspace = true
 libloading = { workspace = true, optional = true }
 
-opentelemetry-proto.workspace = true
+opentelemetry-proto = { workspace = true, optional = true }
 opentelemetry = { workspace = true, optional = true }
 tracing-opentelemetry = { workspace = true, optional = true }
-prost.workspace = true
+prost = { workspace = true, optional = true }
 axum.workspace = true
 bollard = { workspace = true, optional = true }
 oracle = { workspace = true, optional = true }
-hudsucker.workspace = true
-hyper-http-proxy.workspace = true
-hyper-tls.workspace = true
-hyper-util.workspace = true
-rcgen.workspace = true
+hudsucker = { workspace = true, optional = true }
+hyper-http-proxy = { workspace = true, optional = true }
+hyper-tls = { workspace = true, optional = true }
+hyper-util = { workspace = true, optional = true }
+rcgen = { workspace = true, optional = true }
 
 [build-dependencies]
 libffi-sys = { workspace = true, optional = true }