diff --git a/backend/app/services/ticket_service.py b/backend/app/services/ticket_service.py
new file mode 100644
index 00000000..66e9552e
--- /dev/null
+++ b/backend/app/services/ticket_service.py
@@ -0,0 +1,115 @@
+"""Ticket mutation service — wraps PSA provider, resolves is_rf_user flag."""
+from __future__ import annotations
+
+import logging
+from uuid import UUID
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.psa_connection import PsaConnection
+from app.models.psa_member_mapping import PsaMemberMapping
+from app.schemas.psa_tickets import (
+    PSAResourceSchema,
+    PSATicketCreatedSchema,
+    PSATicketStatusUpdateSchema,
+)
+from app.services.psa.registry import get_provider_for_account
+from app.services.psa.types import TicketCreatePayload
+
+logger = logging.getLogger(__name__)
+
+
+async def _get_mapped_member_ids(account_id: UUID, db: AsyncSession) -> set[int]:
+    """Return set of external_member_id ints that are mapped to RF users."""
+    conn_result = await db.execute(
+        select(PsaConnection).where(PsaConnection.account_id == account_id)
+    )
+    conn = conn_result.scalar_one_or_none()
+    if not conn:
+        return set()
+    mappings = await db.execute(
+        select(PsaMemberMapping).where(PsaMemberMapping.psa_connection_id == conn.id)
+    )
+    return {int(m.external_member_id) for m in mappings.scalars().all() if m.external_member_id}
+
+
+async def list_resources(
+    account_id: UUID, ticket_id: int, db: AsyncSession
+) -> list[PSAResourceSchema]:
+    provider = await get_provider_for_account(account_id, db)
+    mapped_ids = await _get_mapped_member_ids(account_id, db)
+    resources = await provider.list_resources(ticket_id)
+    return [
+        PSAResourceSchema(
+            member_id=r.member_id,
+            member_name=r.member_name,
+            member_identifier=r.member_identifier,
+            is_rf_user=r.member_id in mapped_ids,
+        )
+        for r in resources
+    ]
+
+
+async def add_resource(
+    account_id: UUID, ticket_id: int, member_id: int, db: AsyncSession
+) -> PSAResourceSchema:
+    provider = await get_provider_for_account(account_id, db)
+    mapped_ids = await _get_mapped_member_ids(account_id, db)
+    resource = await provider.add_resource(ticket_id, member_id)
+    return PSAResourceSchema(
+        member_id=resource.member_id,
+        member_name=resource.member_name,
+        member_identifier=resource.member_identifier,
+        is_rf_user=resource.member_id in mapped_ids,
+    )
+
+
+async def remove_resource(
+    account_id: UUID, ticket_id: int, member_id: int, db: AsyncSession
+) -> None:
+    provider = await get_provider_for_account(account_id, db)
+    await provider.remove_resource(ticket_id, member_id)
+
+
+async def update_status(
+    account_id: UUID, ticket_id: int, status_id: int, db: AsyncSession
+) -> PSATicketStatusUpdateSchema:
+    provider = await get_provider_for_account(account_id, db)
+    # get current status before updating
+    ticket = await provider.get_ticket(str(ticket_id))
+    previous_status = ticket.status_name or ""
+    await provider.update_ticket_status(str(ticket_id), status_id)
+    # get new status name from statuses list
+    statuses = await provider.get_ticket_statuses(ticket.board_id or 0)
+    new_status = next((s.name for s in statuses if s.id == status_id), str(status_id))
+    return PSATicketStatusUpdateSchema(
+        ticket_id=ticket_id,
+        previous_status=previous_status,
+        new_status=new_status,
+    )
+
+
+async def create_ticket(
+    account_id: UUID, payload: TicketCreatePayload, db: AsyncSession
+) -> PSATicketCreatedSchema:
+    provider = await get_provider_for_account(account_id, db)
+    mapped_ids = await _get_mapped_member_ids(account_id, db)
+    result = await provider.create_ticket(payload)
+    return PSATicketCreatedSchema(
+        id=result.id,
+        summary=result.summary,
+        board_name=result.board_name,
+        status_name=result.status_name,
+        priority_name=result.priority_name,
+        company_name=result.company_name,
+        resources=[
+            PSAResourceSchema(
+                member_id=r.member_id,
+                member_name=r.member_name,
+                member_identifier=r.member_identifier,
+                is_rf_user=r.member_id in mapped_ids,
+            )
+            for r in result.resources
+        ],
+    )