What to Watch For in a Development Contract: An Engineer's Reading of the Clauses

Most people signing a development contract look at two numbers: the total price and the delivery date. But what really determines how your life goes afterward are the clauses nobody reads closely. We're a vendor ourselves — arguably we shouldn't be teaching clients how to negotiate with vendors — but we've also cleaned up after other people's bad contracts too many times, so here it is anyway. What follows is an engineer's reading of the clauses, not legal advice; for major contracts, see a lawyer.

IP ownership: "built for you" does not mean "owned by you"

If the contract doesn't spell it out, copyright defaults to the creator — that is, the vendor. You may have paid in full and bought only a "license to use." The key terms to check:

• Does the copyright transfer to you upon final payment, or are you merely licensed?
• If it's a license, how broad? Can you modify it? Can you hand maintenance to a different vendor?
• What about the vendor's pre-existing components and open-source packages? The reasonable arrangement: custom project work belongs to you, and the vendor's shared libraries are licensed to you perpetually.

Source-code delivery: every hostage story starts here

We've taken over multiple projects where the previous vendor withheld the source code or wouldn't export the database — the client effectively held hostage by the system they paid for. The contract must state, in black and white, the timing and form of delivery for source code, database, deployment documentation, and third-party service accounts (domain, hosting, payment gateway). The complete checklist is in after delivery, who owns the code and the data?

Warranty scope: agree on what "broken" means before you fight about it

Three months to a year of warranty after acceptance is market standard, but "warranty for what" matters more than "warranty for how long":

• Bugs (behavior that violates the spec): fixed free under warranty — obviously.
• New requirements (features outside the spec): quoted separately — also obviously.
• The gray zone: breakage caused by third-party changes (a payment API update, an OS upgrade) — whose problem is that? Write it into the contract now, not into an argument after acceptance.

Payment milestones: cash flow in exchange for progress

The common structure is 30–40% at signing, 30–40% at midpoint, 20–30% at acceptance. The principle: every payment corresponds to a visible deliverable, not to a date. Details and self-protection clauses are in how to negotiate payment milestones.

Changes and termination: plan the breakup in advance

• Change-request procedure: how requests are raised, how they're quoted, who signs off. Without a procedure, "while you're at it" will eat the entire project.
• Mid-project termination: if either side calls it off, how is completed work priced, how are payments already made settled, and is the half-finished work delivered? Nobody wants to discuss this clause while the partnership is happy — but it's the most valuable clause in the contract.

A good contract's job isn't winning the lawsuit — it's making sure both sides never get anywhere near one.

Our own contract template puts all of these clauses in plain language, and we walk through them one by one before signing — because a client who understands what they signed is, in the long run, good for us. If you have a development contract you can't quite parse, book a free 30-minute consultation and we'll read it with you through an engineer's eyes.