How do I negotiate a higher salary without seeming greedy?

Frame your request around market value and your contributions rather than personal need. Research salary ranges for your role using sites like Glassdoor or LinkedIn Salary, then anchor your ask to that data. Say something like "Based on my research and the value I bring in X and Y areas, I was expecting something closer to Z." This makes it about fair compensation, not greed. Come prepared with specific accomplishments and be collaborative in tone, not adversarial. Phrases like "I'm excited about this role and want to make this work" signal good faith. Also consider negotiating the full package including bonuses, vacation, or flexibility if the base salary has a hard ceiling.