Combine rinsed rice and water in a small pot; bring to a boil, then reduce to low, cover, and simmer for 15 minutes. Let stand covered for 5 minutes.
Pat salmon fillets completely dry with paper towels and season the skin side with salt.
Whisk soy sauce, rice vinegar, and sesame oil in a small bowl to create the glaze.
Mix mayonnaise and sriracha in a separate small bowl for the spicy mayo.
Heat neutral oil in a non-stick skillet over medium-high heat. Place salmon skin-side down and press firmly for 30 seconds to prevent curling.
Sear salmon for 5-6 minutes until skin is golden and crispy. Flip and cook for an additional 2-3 minutes until internal temperature reaches 145F.
Fluff the rice and divide into two bowls.
Top rice with salmon, sliced cucumber, and avocado.
Drizzle with soy glaze and spicy mayo. Garnish with scallions and furikake.