Software contracts
Software development contract for companies: which clauses protect you and which are traps
Published: February 19, 2026
Signing a software development contract without understanding the key clauses can cost you the entire project. Unethical vendors use 4 recurring patterns that leave clients without ownership of the code, without guarantees, and with no way to exit the contract if things go wrong. These are the points to review before signing.
This guide targets executives, procurement teams, and operations leads at Spanish companies who are about to sign or are evaluating a software development contract. If your company lacks a CTO or legal team specialized in technology, these points are your minimum defense against vendors operating in contractual grey areas.
The 8 clauses that must be present
- Intellectual property: delivered code must be 100% yours from the first payment. No exceptions.
- Scope definition and acceptance criteria: what is delivered, when, and who decides if it's done correctly.
- Change management: formal process for any scope variation, with signed price and timeline impact.
- Post-delivery warranty: minimum 3 months of bug fixes at no extra cost. Specify what is a bug vs. new feature.
- Confidentiality and data protection: GDPR, restricted access to customer data, security protocols.
- Termination conditions: how to exit the contract for breach, with return of deliverables and code.
- Support and availability SLAs: response times, critical incident escalation, penalties.
- Technical documentation: vendor must deliver documentation sufficient for another team to continue.
The 4 most common trap clauses
- Shared ownership clause: vendor retains license over 'generic' components. In practice, this blocks your portability.
- Fixed price without defined scope: vendor agrees to fixed price without analyzing the project. Surprises are billed as extras.
- Warranty conditioned on paid maintenance: warranty only applies if you contract maintenance with them. Hidden retention model.
- Code ownership in escrow: code only delivered if you pay a large final amount. Legal hostage mechanism.
Intellectual property: the most poorly negotiated point
- Software intellectual property must be explicitly transferred in the contract. Silence does not imply assignment.
- Request it includes: source code, technical documentation, automated tests, deployment scripts, and repository access.
- Be careful with open-source library ownership: the vendor cannot assign you what isn't theirs. Verify licenses.
- If vendor uses proprietary code as a base, negotiate a perpetual, irrevocable license included in the price.
Validation checklist before signing
- Is the complete source code delivered to the company repository from day one, not at the end?
- Is there a detailed scope definition approved by both parties before work starts?
- Is the intellectual property clause a complete, unconditional assignment?
- Do you have the right to audit work at any point during the project at no extra cost?
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