diff --git a/pisa/builder.py b/pisa/builder.py
new file mode 100644
index 0000000..7c77281
--- /dev/null
+++ b/pisa/builder.py
@@ -0,0 +1,39 @@
+from pisa.responder import Job
+from pisa.appointment import Appointment
+
+
+class Builder:
+
+    @staticmethod
+    def build_appointments(appointments_data):
+        appointments = {}
+        locator_uuid_map = {}
+
+        for uuid, appointment_data in appointments_data.items():
+            appointment = Appointment.from_dict(appointment_data)
+            appointments[uuid] = appointment
+
+            if appointment.locator in locator_uuid_map:
+                locator_uuid_map[appointment.locator].append(uuid)
+
+            else:
+                locator_uuid_map[appointment.locator] = [uuid]
+
+        return appointments, locator_uuid_map
+
+    @staticmethod
+    def build_jobs(jobs_data):
+        jobs = {}
+        tx_job_map = {}
+
+        for uuid, job_data in jobs_data.items():
+            job = Job.from_dict(jobs_data)
+            jobs[uuid] = job
+
+            if job.justice_txid in tx_job_map:
+                tx_job_map[job.justice_txid].append(uuid)
+
+            else:
+                tx_job_map[job.justice_txid] = [uuid]
+
+        return jobs, tx_job_map