Dockia Blog
Software development contract for companies: which clauses protect you and which are traps
2026-02-19 • 7 min
The 8 clauses every software development contract in Spain must have and the 4 dangerous clauses that favour the vendor. Guide for non-technical management teams signing contracts with development agencies.
A poorly written software development contract can turn a promising project into a legal, operational, and financial problem. Knowing which clauses to demand and which to reject is as important as choosing the right vendor.
- •Clauses you must always demand: IP ownership of code to client from first commit, repository and documentation delivery at project end, production incident response SLA, and documented process for scope changes with their cost.
- •Dangerous clauses that favour the vendor: 'cost and timeline are indicative subject to revision' (= no price ceiling), 'client accepts deliverables within 5 business days or they are considered accepted' (= no real review time), 'post-delivery maintenance subject to availability' (= no commitment).
- •Contracting models and their risks: fixed price (low client risk, requires closed specification), time and materials (flexible but no price ceiling without contractual cap), and milestone by modules (the best balance for complex evolving projects).
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FAQ
What contract model is best for a custom software project?
For projects with well-defined requirements, fixed price with delay penalties. For projects with evolving requirements, module milestones with fixed scope per module (and variable between modules). Never pure time and materials without an agreed hour cap — exposes the client to unlimited costs.
How do you protect code ownership in a development contract?
The contract must explicitly specify: (1) all code, including proprietary libraries developed during the project, belongs to the client; (2) the repository is under client control from day one; (3) the vendor cannot reuse the code in other projects without written authorization.
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