Thoughtful birthday gift ideas for a boyfriend who is a 27-year-old UI/UX designer involve considering his professional interests and personal preferences. Consider gifts that align with his career, such as a high-quality sketchbook for design ideas, a subscription to a design magazine, or a sleek and stylish digital stylus. For his personal life, think about his hobbies and interests. You might choose an experience-based gift like a weekend getaway to a design conference or a personalized item that reflects his passions, such as custom-made artwork inspired by his favorite designs.