diff --git a/gs/backend/api/v1/aro/endpoints/user.py b/gs/backend/api/v1/aro/endpoints/user.py
index be8400978..414b4ccb1 100644
--- a/gs/backend/api/v1/aro/endpoints/user.py
+++ b/gs/backend/api/v1/aro/endpoints/user.py
@@ -1,3 +1,68 @@
-from fastapi import APIRouter
+from fastapi import APIRouter, HTTPException, status
+
+from gs.backend.api.v1.aro.models.requests import ChangeUserInfo, CreateUser, GetUserData
+from gs.backend.data.data_wrappers.aro_wrapper.aro_user_data_wrapper import add_user, get_user_by_id, modify_user
+from gs.backend.data.tables.aro_user_tables import AROUsers
 
 aro_user_router = APIRouter(tags=["ARO", "User Information"])
+
+
+@aro_user_router.post("/create_user/", status_code=status.HTTP_200_OK)
+def create_user(payload: CreateUser) -> dict[str, AROUsers]:
+    """
+    :param payload: Payload of type CreateUser, contains first_name, last_name,
+      call_sign, email, phone numer
+      all of type str
+    """
+    try:
+        user = add_user(
+            call_sign=payload.call_sign,
+            email=payload.email,
+            f_name=payload.first_name,
+            l_name=payload.last_name,
+            phone_number=payload.phone_number,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=f"Invalid input: {e}") from e
+
+    return {"user": user}
+
+
+@aro_user_router.get("/", status_code=status.HTTP_200_OK)
+def get_user(payload: GetUserData) -> dict[str, AROUsers]:
+    """
+    :param payload: Payload of type GetUserData, contains user_id of type str
+    """
+    try:
+        user_id = payload.user_id
+
+    except KeyError as e:
+        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="Missing user_id") from e
+    try:
+        user = get_user_by_id(user_id)
+        return {"user": user}
+
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=f"User does not exist, {e}") from e
+
+
+@aro_user_router.put("/", status_code=status.HTTP_200_OK)
+def change_user_info(payload: ChangeUserInfo) -> dict[str, AROUsers]:
+    """
+    :params payload: Payload of type ChangeUserInfo, contains user_id of type UUID, first_name,
+      last_name, call_sign
+    """
+    try:
+        user_id = payload.user_id
+
+    except KeyError as e:
+        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="Missing user_id") from e
+
+    allowed_fields = {"first_name", "last_name", "call_sign"}
+    update_fields = {k: v for k, v in payload.model_dump().items() if v is not None and k in allowed_fields}
+
+    try:
+        return {"data": modify_user(userid=user_id, **update_fields)}
+
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(e)) from e
diff --git a/gs/backend/api/v1/aro/models/requests.py b/gs/backend/api/v1/aro/models/requests.py
index e69de29bb..0ae3bfc26 100644
--- a/gs/backend/api/v1/aro/models/requests.py
+++ b/gs/backend/api/v1/aro/models/requests.py
@@ -0,0 +1,34 @@
+from uuid import UUID
+
+from pydantic import BaseModel
+
+
+class CreateUser(BaseModel):
+    """
+    Base model for create user, used for the create user endpoint
+    """
+
+    first_name: str
+    last_name: str
+    call_sign: str
+    email: str
+    phone_number: str
+
+
+class ChangeUserInfo(BaseModel):
+    """
+    Base model for changing user info, used for the change user info endpoint
+    """
+
+    user_id: UUID
+    first_name: str | None = None
+    last_name: str | None = None
+    call_sign: str | None = None
+
+
+class GetUserData(BaseModel):
+    """
+    Base model for getting user info, used by the get user info endpoint
+    """
+
+    user_id: UUID
diff --git a/gs/backend/data/data_wrappers/aro_wrapper/aro_user_data_wrapper.py b/gs/backend/data/data_wrappers/aro_wrapper/aro_user_data_wrapper.py
index fbb7aa89a..4c6396143 100644
--- a/gs/backend/data/data_wrappers/aro_wrapper/aro_user_data_wrapper.py
+++ b/gs/backend/data/data_wrappers/aro_wrapper/aro_user_data_wrapper.py
@@ -1,3 +1,4 @@
+from typing import Any
 from uuid import UUID
 
 from sqlmodel import select
@@ -62,3 +63,38 @@ def delete_user_by_id(userid: UUID) -> list[AROUsers]:
             raise ValueError("User ID does not exist")
 
         return get_all_users()
+
+
+# gets the user with given id
+def get_user_by_id(userid: UUID) -> AROUsers:
+    """
+    Use the user.id to delete a user from table
+
+    :param userid: identifier unique to the user
+    """
+    with get_db_session() as session:
+        user = session.get(AROUsers, userid)
+
+        if user:
+            return user
+        else:
+            raise ValueError("User ID does not exist")
+
+
+def modify_user(userid: UUID, **kwargs: dict[str, Any]) -> AROUsers:
+    """
+    Modifies the target user
+
+    :param userid: identifier unique to the user
+    """
+    with get_db_session() as session:
+        user = session.get(AROUsers, userid)
+        if not user:
+            raise ValueError("User does not exist based on ID")
+
+        for field, value in kwargs.items():
+            setattr(user, field, value)
+
+        session.commit()
+        session.refresh(user)
+        return user
diff --git a/gs/backend/state_machine/state_enums.py b/gs/backend/state_machine/state_enums.py
new file mode 100644
index 000000000..bcea28415
--- /dev/null
+++ b/gs/backend/state_machine/state_enums.py
@@ -0,0 +1,27 @@
+from enum import StrEnum, auto
+
+
+class StateMachineStates(StrEnum):
+    """
+    The states of the ground station state machine
+    Defaults to disconnected
+    """
+
+    # UPLINK STATES
+    DISCONNECTED = auto()
+    ATTEMPTING_CONNECTION = auto()
+    AWAITING_ACK = auto()
+    UPLINKING = auto()
+    DOWNLINKING = auto()
+
+    # DISCONNECT STATES
+    AWAITING_DISCONNECT = auto()
+    SEND_DISCONNECT_ACK = auto()
+
+    # EMERGENCY STATES
+    ENTERING_EMERGENCY = auto()
+    AWAITING_CONNECTION = auto()
+    SEND_CONNECTION_ACK = auto()
+    EMERGENCY_UPLINK = auto()
+
+    SERVER_SIDE_ERROR = auto()
diff --git a/gs/backend/state_machine/state_machine.py b/gs/backend/state_machine/state_machine.py
new file mode 100644
index 000000000..47b0e9260
--- /dev/null
+++ b/gs/backend/state_machine/state_machine.py
@@ -0,0 +1,125 @@
+from gs.backend.state_machine.state_enums import StateMachineStates
+from gs.backend.state_machine.state_transition_enums import StateTransition
+
+
+class StateMachine:
+    """
+    Ground station state machine.
+    """
+
+    def __init__(self, default_state: StateMachineStates) -> None:
+        """
+        Initialize the state machine and sets the default state and default transitional state
+
+        :params default_state: default state which must come from one of the enums in StateMachineStates
+        """
+        self.state = default_state
+        self.transitional_state: StateTransition = StateTransition.NO_TRANSITION_TRIGGERED
+
+    def switch_state(self, transitional_state: StateTransition) -> None:
+        """
+        :params transitional_state: The transitional state of the state machine, used to update state
+        """
+        self.transitional_state = transitional_state
+
+        match self.state:
+            case StateMachineStates.DISCONNECTED:
+                match self.transitional_state:
+                    case StateTransition.ENTER_EMERGENCY:
+                        self.state = StateMachineStates.ENTERING_EMERGENCY
+                    case StateTransition.BEGIN_UPLINK:
+                        self.state = StateMachineStates.ATTEMPTING_CONNECTION
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.ATTEMPTING_CONNECTION:
+                match self.transitional_state:
+                    case StateTransition.CONNECTION_ESTABLISHED:
+                        self.state = StateMachineStates.AWAITING_ACK
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.AWAITING_ACK:
+                match self.transitional_state:
+                    case StateTransition.ACK_RECEIVED:
+                        self.state = StateMachineStates.UPLINKING
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.UPLINKING:
+                match self.transitional_state:
+                    case StateTransition.UPLINK_FINISHED:
+                        self.state = StateMachineStates.DOWNLINKING
+                    case StateTransition.DISCONNECTING:
+                        self.state = StateMachineStates.AWAITING_DISCONNECT
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.AWAITING_DISCONNECT:
+                match self.transitional_state:
+                    case StateTransition.DISCONNECT_CMD_RECEIVED:
+                        self.state = StateMachineStates.SEND_DISCONNECT_ACK
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.SEND_DISCONNECT_ACK:
+                match self.transitional_state:
+                    case StateTransition.DISCONNECT_COMPLETE:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.DOWNLINKING:
+                match self.transitional_state:
+                    case StateTransition.DOWNLINKING_FINISHED:
+                        self.state = StateMachineStates.UPLINKING
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.ENTERING_EMERGENCY:
+                match self.transitional_state:
+                    case StateTransition.EMERGENCY_INITIATED:
+                        self.state = StateMachineStates.AWAITING_CONNECTION
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.AWAITING_CONNECTION:
+                match self.transitional_state:
+                    case StateTransition.CONNECTION_RECEIVED:
+                        self.state = StateMachineStates.SEND_CONNECTION_ACK
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.SEND_CONNECTION_ACK:
+                match self.transitional_state:
+                    case StateTransition.CONNECTION_ACK_SENT:
+                        self.state = StateMachineStates.EMERGENCY_UPLINK
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
+
+            case StateMachineStates.EMERGENCY_UPLINK:
+                match self.transitional_state:
+                    case StateTransition.EMERGENCY_UPLINK_FINISHED:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case StateTransition.ERROR:
+                        self.state = StateMachineStates.DISCONNECTED
+                    case _:
+                        self.state = StateMachineStates.SERVER_SIDE_ERROR
diff --git a/gs/backend/state_machine/state_transition_enums.py b/gs/backend/state_machine/state_transition_enums.py
new file mode 100644
index 000000000..86f0a014e
--- /dev/null
+++ b/gs/backend/state_machine/state_transition_enums.py
@@ -0,0 +1,33 @@
+from enum import StrEnum, auto
+
+
+class StateTransition(StrEnum):
+    """
+    The transition states of the ground station state machine
+    """
+
+    # TODO rename / clarify the specific transition states
+    ERROR = auto()
+
+    # UPLINK TRANSITION STATES
+    BEGIN_UPLINK = auto()
+    CONNECTION_ESTABLISHED = auto()
+    ACK_RECEIVED = auto()
+
+    # UPLINK / DOWNLINK TRANSITION STATES
+    UPLINK_FINISHED = auto()
+    DOWNLINKING_FINISHED = auto()
+
+    # DISCONNECT TRANSITION STATES
+    DISCONNECTING = auto()
+    DISCONNECT_CMD_RECEIVED = auto()
+    DISCONNECT_COMPLETE = auto()
+
+    # EMERGENCY TRANSITION STATES
+    ENTER_EMERGENCY = auto()
+    EMERGENCY_INITIATED = auto()
+    CONNECTION_RECEIVED = auto()
+    CONNECTION_ACK_SENT = auto()
+    EMERGENCY_UPLINK_FINISHED = auto()
+
+    NO_TRANSITION_TRIGGERED = auto()  # NOT USED IN STATE MACHINE
diff --git a/python_test/test_user_api_endpoint.py b/python_test/test_user_api_endpoint.py
new file mode 100644
index 000000000..ef4e98d17
--- /dev/null
+++ b/python_test/test_user_api_endpoint.py
@@ -0,0 +1,22 @@
+from fastapi.testclient import TestClient
+from gs.backend.main import app
+
+
+def test_create_user():
+    with TestClient(app) as client:
+        json_obj = {
+            "call_sign": "KEVWAN",
+            "email": "kevwan19@gmail.com",
+            "first_name": "kevin",
+            "last_name": "wan",
+            "phone_number": "18008888888",
+        }
+
+        res = client.post("/api/v1/aro/user/create_user/", json=json_obj)
+        assert res.status_code == 200
+        user = res.model_dump().get("user")
+        assert user.call_sign == "KEVWAN"
+        assert user.email == "kevwan19@gmail.com"
+        assert user.first_name == "kevin"
+        assert user.last_name == "wan"
+        assert user.phone_number == "18008888888"