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+## How to build and run an application from local
+
+### For workers
+
+Workers are the application which handle core functionalities.
+
+- List of workers are
+  - alerts
+  - assets
+  - db
+  - ender
+  - http
+  - integrations
+  - sink
+  - storage
+
+- Build: 
+  ```
+  cd openreplay/backend
+  # IMAGE_TAG=<version of openreplay, check in vars.yaml> DOCKER_REPO=rg.fr-par.scw.cloud/foss bash build.sh <worker_name>
+  # For example,
+  IMAGE_TAG=v1.0.0 DOCKER_REPO=rg.fr-par.scw.cloud/foss bash build.sh assets
+  ```
+- Deploy:
+  ```
+  cd openreplay/scripts/helm
+  bash openreplay-cli --install <worker_name>
+  ```
+## For api 
+  
+All apis are handled by application called, chalice, which is a python3 application.
+
+- Build:
+  ```
+  cd openreplay/api/
+  # IMAGE_TAG=<version of openreplay, check in vars.yaml> DOCKER_REPO=rg.fr-par.scw.cloud/foss bash build.sh
+  # For example,
+  IMAGE_TAG=v1.0.0 DOCKER_REPO=rg.fr-par.scw.cloud/foss bash build.sh
+  ```
+- Deploy:
+  ```
+  cd openreplay/scripts/helm
+  bash openreplay-cli --install chalice
+  ```
+  
+## For frontend
+
+Frontend is mainly JS components. When we're installing it, it's built and then installed. So you don't have to run a separate build for frontend.
+
+Note: if you want to see how it gets build, please refer, `openreplay/frontend/build.sh`
+
+- Build and Deploy:
+  ```
+  cd openreplay/scripts/helm
+  bash openreplay-cli --install frontend
+  ```