diff --git a/app/services/prediction_results/process.rb b/app/services/prediction_results/process.rb
index 4ea8fb0..7d02671 100755
--- a/app/services/prediction_results/process.rb
+++ b/app/services/prediction_results/process.rb
@@ -5,7 +5,6 @@
 module PredictionResults
   class Process
     SUBJECT_ACTION_API_BATCH_SIZE = ENV.fetch('SUBJECT_ACTION_API_BATCH_SIZE', '10').to_i
-    COMPLETION_NOTIFICATION_THRESHOLD = ENV.fetch('COMPLETION_NOTIFICATION_THRESHOLD', '0.95').to_f
 
     attr_accessor :results_url, :subject_set_id, :probability_threshold,
                   :over_threshold_subject_ids, :under_threshold_subject_ids,
@@ -20,7 +19,6 @@ def initialize(results_url:, subject_set_id:, probability_threshold: 0.8, random
       @under_threshold_subject_ids = []
       @random_spice_subject_ids = []
       @prediction_data = nil
-      @total_subjects = 0
     end
 
     def run
@@ -38,10 +36,11 @@ def run
         remove_under_threshold_subjects_from_active_set
         add_random_spice_subjects_to_active_set
       end
+
+      schedule_subjects_retirement_check
     end
 
     def partition_results
-      @total_subjects = prediction_data.count
       prediction_data.each do |subject_id, prediction_samples|
         # data schema format is published in the file
         # and https://github.com/zooniverse/bajor/blob/main/azure/batch/scripts/predict_on_catalog.py
@@ -53,7 +52,6 @@ def partition_results
         @over_threshold_subject_ids << subject_id if probability >= probability_threshold
         @under_threshold_subject_ids << subject_id if probability < probability_threshold
       end
-      check_completion_and_notify
       # now add some 'spice' to the results by adding some random under threshold subject ids
       # but don't skew the prediction results by adding too many under threshold images
       # ensure we only use apply the randomisation factor to the count of over threshold subject ids
@@ -90,12 +88,8 @@ def api_batch_bulk_job_args(subject_ids)
     end
 
     private
-    def check_completion_and_notify
-      total_under_threshold_subjects = @under_threshold_subject_ids.count
-      completion_rate = (total_under_threshold_subjects.to_f / @total_subjects.to_f)
-      if completion_rate >= COMPLETION_NOTIFICATION_THRESHOLD
-        NotifyProjectOwnerJob.perform_async(subject_set_id, completion_rate)
-      end
+    def schedule_subjects_retirement_check
+      SubjectsRetirementWorker.perform_async(subject_set_id)
     end
   end
 end
diff --git a/app/sidekiq/add_subject_to_subject_set_job.rb b/app/sidekiq/add_subject_to_subject_set_job.rb
index 9342fd0..e2dfec2 100644
--- a/app/sidekiq/add_subject_to_subject_set_job.rb
+++ b/app/sidekiq/add_subject_to_subject_set_job.rb
@@ -1,23 +1,14 @@
 # frozen_string_literal: true
+require 'panoptes/api'
+require 'concerns/panoptes_retry'
 
 class AddSubjectToSubjectSetJob
   include Sidekiq::Job
+  include PanoptesRetry
 
   def perform(subject_ids, subject_set_id, max_retries = 3)
-    retries ||= 1
-    Sync do
+    with_panoptes_retry(max_retries: max_retries) do
       Panoptes::Api.client.add_subjects_to_subject_set(subject_set_id, Array.wrap(subject_ids))
-    rescue Panoptes::Client::ServerError => e
-      # handle intermittent API errors like the following
-      # e.g. {"errors"=>[{"message"=>"Attempted to update a stale object: SubjectSet."}]}
-      retries += 1
-      raise e if retries > max_retries
-
-      # sleep for a random amount of time between 0 and max_retries and then retry the API client operation
-      sleep(rand(max_retries))
-      retry
-    ensure
-      Faraday.default_connection.close
     end
   end
 end
diff --git a/app/sidekiq/concerns/panoptes_retry.rb b/app/sidekiq/concerns/panoptes_retry.rb
new file mode 100644
index 0000000..9026b55
--- /dev/null
+++ b/app/sidekiq/concerns/panoptes_retry.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module PanoptesRetry
+  extend ActiveSupport::Concern
+
+  def with_panoptes_retry(max_retries: 3)
+    attempts = 0
+
+    Sync do
+      yield
+    rescue Panoptes::Client::ServerError => e
+      attempts += 1
+      raise e if attempts >= max_retries
+
+      sleep(rand(max_retries))
+      retry
+    ensure
+      Faraday.default_connection.close
+    end
+  end
+end
diff --git a/app/sidekiq/remove_subject_from_subject_set_job.rb b/app/sidekiq/remove_subject_from_subject_set_job.rb
index ff64c2d..4138385 100644
--- a/app/sidekiq/remove_subject_from_subject_set_job.rb
+++ b/app/sidekiq/remove_subject_from_subject_set_job.rb
@@ -1,12 +1,13 @@
 # frozen_string_literal: true
 
 require 'panoptes/api'
+require 'concerns/panoptes_retry'
 
 class RemoveSubjectFromSubjectSetJob
   include Sidekiq::Job
+  include PanoptesRetry
 
   def perform(subject_ids, subject_set_id, max_retries=3)
-    retries ||= 1
     # format the subject ids into a comma separated string
     # which the API expects for the destroy_links action
     linked_subject_ids = Array.wrap(subject_ids).join(',')
@@ -14,19 +15,8 @@ def perform(subject_ids, subject_set_id, max_retries=3)
     # use the underlying client implementation to achieve it
     # longer term I should add this to the client...
     # apologies to all future selves for not doing so this time :sadpanda:
-    Sync do
+    with_panoptes_retry(max_retries: max_retries) do
       Panoptes::Api.client.panoptes.delete("/subject_sets/#{subject_set_id}/links/subjects/#{linked_subject_ids}")
-    rescue Panoptes::Client::ServerError => e
-      # handle intermittent API errors like the following
-      # e.g. {"errors"=>[{"message"=>"Attempted to update a stale object: SubjectSet."}]}
-      retries += 1
-      raise e if retries > max_retries
-
-      # sleep for a random amount of time between 0 and max_retries and then retry the API client operation
-      sleep(rand(max_retries))
-      retry
-    ensure
-      Faraday.default_connection.close
     end
   end
 end
diff --git a/app/sidekiq/subjects_retirement_worker.rb b/app/sidekiq/subjects_retirement_worker.rb
new file mode 100644
index 0000000..910221e
--- /dev/null
+++ b/app/sidekiq/subjects_retirement_worker.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+require 'panoptes/api'
+require 'concerns/panoptes_retry'
+
+class SubjectsRetirementWorker
+  include Sidekiq::Job
+  include PanoptesRetry
+
+  COMPLETION_NOTIFICATION_THRESHOLD = ENV.fetch('COMPLETION_NOTIFICATION_THRESHOLD', '0.95').to_f
+
+  def perform(subject_set_id, max_retries = 3)
+    context = Context.find_by(active_subject_set_id: subject_set_id)
+    return unless context&.workflow_id
+
+    workflow_id = context.workflow_id
+    with_panoptes_retry(max_retries: max_retries) do
+      resp = Panoptes::Api.client.subject_set(subject_set_id)
+      completeness = resp.fetch('completeness', {})[workflow_id.to_s]
+      notify_if_completion_threshold_met(subject_set_id, completeness)
+    end
+  end
+
+  private
+
+  def notify_if_completion_threshold_met(subject_set_id, completion_rate)
+    return if completion_rate.nil?
+
+    completion_rate = completion_rate.to_f
+    if completion_rate >= COMPLETION_NOTIFICATION_THRESHOLD
+      NotifyProjectOwnerJob.perform_async(subject_set_id, completion_rate)
+    end
+  end
+end
diff --git a/spec/services/prediction_results/process_spec.rb b/spec/services/prediction_results/process_spec.rb
index a65a2e3..f6012be 100755
--- a/spec/services/prediction_results/process_spec.rb
+++ b/spec/services/prediction_results/process_spec.rb
@@ -65,6 +65,12 @@
       process_results_service.run
       expect(process_results_service).to have_received(:add_random_spice_subjects_to_active_set)
     end
+
+    it 'schedules the subject retirement worker' do
+      allow(SubjectsRetirementWorker).to receive(:perform_async)
+      process_results_service.run
+      expect(SubjectsRetirementWorker).to have_received(:perform_async).with(active_subject_set_id)
+    end
   end
 
   describe '#partition_results' do
@@ -94,17 +100,6 @@
       expect(process_results_service.random_spice_subject_ids).to match_array([under_threshold_subject_id])
     end
 
-    context 'when completion hits the notification threshold' do
-      before do
-        stub_const("PredictionResults::Process::COMPLETION_NOTIFICATION_THRESHOLD", 0.5)
-        allow(NotifyProjectOwnerJob).to receive(:perform_async)
-      end
-
-      it 'calls NotifyProjectOwnerJob for almost retired subjects' do
-        process_results_service.partition_results
-        expect(NotifyProjectOwnerJob).to have_received(:perform_async).with(active_subject_set_id, 0.5)
-      end
-    end
   end
 
   describe '#move_over_threshold_subjects_to_active_set' do
diff --git a/spec/sidekiq/subjects_retirement_worker_spec.rb b/spec/sidekiq/subjects_retirement_worker_spec.rb
new file mode 100644
index 0000000..6150eee
--- /dev/null
+++ b/spec/sidekiq/subjects_retirement_worker_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe SubjectsRetirementWorker, type: :job do
+  describe '#perform' do
+    let(:worker) { described_class.new }
+    let(:context) { Context.first }
+    let(:subject_set_id) { context.active_subject_set_id }
+
+    before do
+      allow(worker).to receive(:with_panoptes_retry).and_yield
+      allow(NotifyProjectOwnerJob).to receive(:perform_async)
+    end
+
+    context 'when a context does not exist' do
+      it 'returns early when no context is found' do
+        local_subject_set_id = 20
+        worker.perform(local_subject_set_id)
+
+        expect(worker).not_to have_received(:with_panoptes_retry)
+        expect(NotifyProjectOwnerJob).not_to have_received(:perform_async)
+      end
+    end
+
+    context 'when a context with a workflow id exists' do
+      let(:workflow_id) { context.workflow_id }
+      let(:panoptes_client) { instance_double(Panoptes::Client) }
+
+      before do
+        allow(Panoptes::Api).to receive(:client).and_return(panoptes_client)
+      end
+
+      context 'and the Panoptes response lacks completeness' do
+        before do
+          allow(panoptes_client).to receive(:subject_set).with(subject_set_id).and_return('completeness' => {})
+        end
+
+        it 'does not enqueue a notification' do
+          worker.perform(subject_set_id)
+          expect(NotifyProjectOwnerJob).not_to have_received(:perform_async)
+        end
+      end
+
+      context 'and the completion rate is below the threshold' do
+        before do
+          allow(panoptes_client).to receive(:subject_set).with(subject_set_id).and_return('completeness' => { workflow_id.to_s => 0.25 })
+        end
+
+        it 'does not enqueue a notification' do
+          worker.perform(subject_set_id)
+          expect(NotifyProjectOwnerJob).not_to have_received(:perform_async)
+        end
+      end
+
+      context 'and the completion rate meets the threshold' do
+        let(:completeness_value) { 0.96 }
+
+        before do
+          allow(panoptes_client).to receive(:subject_set).with(subject_set_id).and_return('completeness' => { workflow_id.to_s => completeness_value })
+        end
+
+        it 'enqueues a notification with the completion rate' do
+          worker.perform(subject_set_id)
+          expect(NotifyProjectOwnerJob).to have_received(:perform_async).with(subject_set_id, completeness_value)
+          expect(worker).to have_received(:with_panoptes_retry).with(max_retries: 3)
+        end
+      end
+    end
+  end
+end