Every programming project needs a solid contract. Without one, you risk miscommunications, unpaid work, and misunderstandings. A well-defined document outlining the scope of work is essential for both you and the client to be on the same page. If you're tracking time, document what you accomplish daily and send regular invoices. Don’t fall into the trap of "eating hours" — be transparent and fair with your billing. When you set clear expectations, maintain consistent documentation, and bill regularly, you'll avoid 95% of the problems that plague freelance programmers, from unpaid hours to disputes over integrity. Take control by making contracts and documentation a non-negotiable part of your process.