01 - Combine drained tuna, breadcrumbs, bell pepper, green onions, cilantro, eggs, mayonnaise, sriracha, Dijon mustard, garlic powder, smoked paprika, salt, and black pepper in a large bowl. Mix gently until fully incorporated.
02 - Divide the mixture into 8 equal portions and shape into compact patties.
03 - Heat vegetable oil in a large nonstick skillet over medium heat. Fry tuna cakes in batches for 3-4 minutes per side until golden brown and crisp. Transfer to a paper towel-lined plate to drain.
04 - Whisk together mayonnaise, sriracha, lime juice, and a pinch of salt in a small bowl until smooth and combined.
05 - Serve tuna cakes hot, drizzled with sriracha mayo or with sauce on the side for dipping.