diff --git a/services/feature-flags/src/config.rs b/services/feature-flags/src/config.rs
--- a/services/feature-flags/src/config.rs
+++ b/services/feature-flags/src/config.rs
@@ -4,7 +4,9 @@
 use once_cell::sync::Lazy;
 use tracing::info;
 
-use crate::constants::{AWS_REGION, DEFAULT_LOCALSTACK_URL};
+use crate::constants::{
+  AWS_REGION, DEFAULT_LOCALSTACK_URL, HTTP_SERVER_DEFAULT_PORT,
+};
 
 #[derive(Parser)]
 #[command(version, about, long_about = None)]
@@ -16,6 +18,8 @@
   /// AWS Localstack service URL, applicable in sandbox mode
   #[arg(long, default_value_t = DEFAULT_LOCALSTACK_URL.to_string())]
   pub localstack_url: String,
+  #[arg(long = "port", default_value_t = HTTP_SERVER_DEFAULT_PORT)]
+  pub http_port: u16,
 }
 
 pub static CONFIG: Lazy<AppConfig> = Lazy::new(|| AppConfig::parse());
diff --git a/services/feature-flags/src/constants.rs b/services/feature-flags/src/constants.rs
--- a/services/feature-flags/src/constants.rs
+++ b/services/feature-flags/src/constants.rs
@@ -2,6 +2,7 @@
 pub const DEFAULT_LOCALSTACK_URL: &str = "http://localhost:4566";
 pub const LOG_LEVEL_ENV_VAR: &str =
   tracing_subscriber::filter::EnvFilter::DEFAULT_ENV;
+pub const HTTP_SERVER_DEFAULT_PORT: u16 = 50051;
 
 // The configuration of feature flags is stored in a table in DynamoDB.
 // Each row is identified by a compound primary key consisting of