diff --git a/docker-compose.development.yml b/docker-compose.development.yml
index 03d86d9..d52a739 100644
--- a/docker-compose.development.yml
+++ b/docker-compose.development.yml
@@ -7,10 +7,15 @@ services:
       - "127.0.0.1:9002:80"
     environment:
       API_UPSTREAM: "http://firstleg-development-gateway:9000"
+      OVERSEAS_API_UPSTREAM: "http://firstleg-development-gateway-overseas:9300"
     networks:
       - development-backend
+      - development-overseas-backend
 
 networks:
   development-backend:
     external: true
     name: firstleg-development-network
+  development-overseas-backend:
+    external: true
+    name: firstleg-development-overseas-network
diff --git a/src/deployment/nginxConfig.test.mjs b/src/deployment/nginxConfig.test.mjs
index c32b26a..44dbcd0 100644
--- a/src/deployment/nginxConfig.test.mjs
+++ b/src/deployment/nginxConfig.test.mjs
@@ -4,6 +4,7 @@ import test from 'node:test'
 
 const config = readFileSync(new URL('../../nginx/default.conf.template', import.meta.url), 'utf8')
 const testCompose = readFileSync(new URL('../../docker-compose.test.yml', import.meta.url), 'utf8')
+const developmentCompose = readFileSync(new URL('../../docker-compose.development.yml', import.meta.url), 'utf8')
 const jenkinsfile = readFileSync(new URL('../../Jenkinsfile', import.meta.url), 'utf8')
 const dockerfile = readFileSync(new URL('../../Dockerfile', import.meta.url), 'utf8')
 
@@ -22,6 +23,15 @@ test('routes domestic and overseas browser APIs to their test gateways without d
   assert.doesNotMatch(config, /\/api\/api/)
 })
 
+test('connects the development client proxy to both development gateways', () => {
+  assert.match(developmentCompose, /API_UPSTREAM: "http:\/\/firstleg-development-gateway:9000"/)
+  assert.match(developmentCompose, /OVERSEAS_API_UPSTREAM: "http:\/\/firstleg-development-gateway-overseas:9300"/)
+  assert.match(developmentCompose, /- development-backend/)
+  assert.match(developmentCompose, /- development-overseas-backend/)
+  assert.match(developmentCompose, /development-overseas-backend:[\s\S]*?external: true[\s\S]*?name: firstleg-development-overseas-network/)
+  assert.doesNotMatch(developmentCompose, /test-api|prod(?:uction)?/i)
+})
+
 test('runs each deployment on its target node without controller-local SSH files', () => {
   assert.match(jenkinsfile, /env\.JOB_BASE_NAME\?\.endsWith\('-dev'\) \? 'java-dev' : 'java-test'/)
   assert.match(jenkinsfile, /DEVELOPMENT_COMPOSE_PROJECT = 'client-web'/)