diff --git a/client.go b/client.go
index d23959ec..7b1f5e02 100644
--- a/client.go
+++ b/client.go
@@ -1441,14 +1441,41 @@ func (c *Client[TTx]) InsertManyTx(ctx context.Context, tx TTx, params []InsertM
 }
 
 func (c *Client[TTx]) insertMany(ctx context.Context, tx riverdriver.ExecutorTx, params []InsertManyParams) ([]*rivertype.JobInsertResult, error) {
+	return c.insertManyShared(ctx, tx, params, func(ctx context.Context, insertParams []*riverdriver.JobInsertFastParams) ([]*rivertype.JobInsertResult, error) {
+		results, err := tx.JobInsertFastMany(ctx, insertParams)
+		if err != nil {
+			return nil, err
+		}
+
+		return sliceutil.Map(results,
+			func(result *riverdriver.JobInsertFastResult) *rivertype.JobInsertResult {
+				return (*rivertype.JobInsertResult)(result)
+			},
+		), nil
+	})
+}
+
+// The shared code path for all InsertMany methods. It takes a function that
+// executes the actual insert operation and allows for different implementations
+// of the insert query to be passed in, each mapping their results back to a
+// common result type.
+//
+// TODO(bgentry): this isn't yet used for the single insert path. The only thing
+// blocking that is the removal of advisory lock unique inserts.
+func (c *Client[TTx]) insertManyShared(
+	ctx context.Context,
+	tx riverdriver.ExecutorTx,
+	params []InsertManyParams,
+	execute func(context.Context, []*riverdriver.JobInsertFastParams) ([]*rivertype.JobInsertResult, error),
+) ([]*rivertype.JobInsertResult, error) {
 	insertParams, err := c.insertManyParams(params)
 	if err != nil {
 		return nil, err
 	}
 
-	jobRows, err := tx.JobInsertFastMany(ctx, insertParams)
+	inserted, err := execute(ctx, insertParams)
 	if err != nil {
-		return nil, err
+		return inserted, err
 	}
 
 	queues := make([]string, 0, 10)
@@ -1460,12 +1487,7 @@ func (c *Client[TTx]) insertMany(ctx context.Context, tx riverdriver.ExecutorTx,
 	if err := c.maybeNotifyInsertForQueues(ctx, tx, queues); err != nil {
 		return nil, err
 	}
-
-	return sliceutil.Map(jobRows,
-		func(result *riverdriver.JobInsertFastResult) *rivertype.JobInsertResult {
-			return (*rivertype.JobInsertResult)(result)
-		},
-	), nil
+	return inserted, nil
 }
 
 // Validates input parameters for a batch insert operation and generates a set
@@ -1516,11 +1538,6 @@ func (c *Client[TTx]) InsertManyFast(ctx context.Context, params []InsertManyPar
 		return 0, errNoDriverDBPool
 	}
 
-	insertParams, err := c.insertManyFastParams(params)
-	if err != nil {
-		return 0, err
-	}
-
 	// Wrap in a transaction in case we need to notify about inserts.
 	tx, err := c.driver.GetExecutor().Begin(ctx)
 	if err != nil {
@@ -1528,7 +1545,7 @@ func (c *Client[TTx]) InsertManyFast(ctx context.Context, params []InsertManyPar
 	}
 	defer tx.Rollback(ctx)
 
-	inserted, err := c.insertManyFast(ctx, tx, insertParams)
+	inserted, err := c.insertManyFast(ctx, tx, params)
 	if err != nil {
 		return 0, err
 	}
@@ -1562,54 +1579,23 @@ func (c *Client[TTx]) InsertManyFast(ctx context.Context, params []InsertManyPar
 // unique conflicts cannot be handled gracefully. If a unique constraint is
 // violated, the operation will fail and no jobs will be inserted.
 func (c *Client[TTx]) InsertManyFastTx(ctx context.Context, tx TTx, params []InsertManyParams) (int, error) {
-	insertParams, err := c.insertManyFastParams(params)
-	if err != nil {
-		return 0, err
-	}
-
 	exec := c.driver.UnwrapExecutor(tx)
-	return c.insertManyFast(ctx, exec, insertParams)
-}
-
-func (c *Client[TTx]) insertManyFast(ctx context.Context, tx riverdriver.ExecutorTx, insertParams []*riverdriver.JobInsertFastParams) (int, error) {
-	inserted, err := tx.JobInsertFastManyNoReturning(ctx, insertParams)
-	if err != nil {
-		return inserted, err
-	}
-
-	queues := make([]string, 0, 10)
-	for _, params := range insertParams {
-		if params.State == rivertype.JobStateAvailable {
-			queues = append(queues, params.Queue)
-		}
-	}
-	if err := c.maybeNotifyInsertForQueues(ctx, tx, queues); err != nil {
-		return 0, err
-	}
-	return inserted, nil
+	return c.insertManyFast(ctx, exec, params)
 }
 
-// Validates input parameters for an a batch insert operation and generates a
-// set of batch insert parameters.
-func (c *Client[TTx]) insertManyFastParams(params []InsertManyParams) ([]*riverdriver.JobInsertFastParams, error) {
-	if len(params) < 1 {
-		return nil, errors.New("no jobs to insert")
-	}
-
-	insertParams := make([]*riverdriver.JobInsertFastParams, len(params))
-	for i, param := range params {
-		if err := c.validateJobArgs(param.Args); err != nil {
-			return nil, err
-		}
-
-		insertParamsItem, _, err := insertParamsFromConfigArgsAndOptions(&c.baseService.Archetype, c.config, param.Args, param.InsertOpts, true)
+func (c *Client[TTx]) insertManyFast(ctx context.Context, tx riverdriver.ExecutorTx, params []InsertManyParams) (int, error) {
+	results, err := c.insertManyShared(ctx, tx, params, func(ctx context.Context, insertParams []*riverdriver.JobInsertFastParams) ([]*rivertype.JobInsertResult, error) {
+		count, err := tx.JobInsertFastManyNoReturning(ctx, insertParams)
 		if err != nil {
 			return nil, err
 		}
-		insertParams[i] = insertParamsItem
+		return make([]*rivertype.JobInsertResult, count), nil
+	})
+	if err != nil {
+		return 0, err
 	}
 
-	return insertParams, nil
+	return len(results), nil
 }
 
 func (c *Client[TTx]) maybeNotifyInsert(ctx context.Context, tx riverdriver.ExecutorTx, state rivertype.JobState, queue string) error {