Your development agreement should clearly explain who owns the source code, designs, documentation, and other project deliverables created during the engagement.
Ambiguous intellectual property language can become a problem during fundraising, technical due diligence, or when you need to change development partners.
Review whether intellectual property is assigned clearly, whether the delivered work is original, and how pre-existing libraries or tools are licensed.
A professional engineering partner should be comfortable discussing IP ownership openly and documenting the arrangement clearly before development begins.