Preheat the oven to 220°C (425°F) with a rack in the centre. Line a small tray with parchment.
Roast the salmon for about 10 minutes, until it flakes easily and reaches 63°C (145°F). Flake into large pieces, discarding the skin.
Meanwhile, bring a large pot of salted water to a boil over high heat and cook the pasta for the time on the package, about 11 minutes, adding the peas for the last 2 minutes. Save a mug of pasta water and drain.
Return the pasta and peas to the pot off the heat and toss with the pesto, spinach, lemon juice and a splash of pasta water until the spinach wilts.
Gently fold in the salmon, season with pepper and top with parmesan.
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