Software Development Agreement

Software Development Agreement

For Informational Purposes Only

A comprehensive contract for custom software engagements — covering scope, milestones, acceptance testing, IP ownership, secure development practices, and transition planning.

Download Template (.docx)

What This Document Does

This agreement governs the relationship between a company that needs custom software built and the developer or development firm building it. It covers the full lifecycle — from defining what gets built and how changes are managed, through delivery and acceptance testing, to who owns the code, how security is handled, and what happens when the engagement ends.

The template is structured around a milestone-based development plan with objective acceptance criteria, written change control, and a clear IP ownership election. It includes four exhibits that serve as the operational backbone of the engagement: the Development Plan, Fee Schedule, IP and Component Register, and Support and Transition terms.

Why Startups Need This

Most software disputes trace back to the same few gaps: unclear scope that leads to budget overruns, ambiguous ownership that blocks a future financing or acquisition, acceptance criteria that are too vague to enforce, and no plan for what happens when the developer relationship ends. A handshake or a two-page scope document might feel efficient at the start, but it creates real problems when the project hits its first complication — and every software project hits complications.

For startups, the IP question is especially consequential. If a developer retains ownership of key components and the startup only has a license, that can create issues during due diligence for a fundraise or acquisition. Conversely, developers who build reusable frameworks need clear rights to use their tools on future projects. This template addresses the tension head-on with three distinct IP models that the parties select at signing.

Key Provisions Explained

Three IP Ownership Models

The agreement presents three complete alternatives. Option A (Developer-Owned) means the developer keeps the code and grants the customer a license — common when the developer is building on a platform they use across clients. Option B (Customer-Owned) assigns all bespoke work to the customer upon payment, with the developer retaining rights to generic methods and techniques. Option C (Split by Component) uses a component register to allocate ownership piece by piece — realistic for projects that combine custom features with reusable infrastructure.

Milestone-Based Delivery and Acceptance

Each milestone has defined acceptance tests with objective pass/fail criteria. The customer gets a review period to test, a structured correction cycle with a cap on retries, and clear consequences if a deliverable repeatedly fails — including the right to terminate the milestone and recover fees. Deemed acceptance protects the developer from indefinite review delays, but only triggers after a reminder notice.

Written Change Control

Scope creep is the single most common source of software project disputes. This agreement requires that any change to scope, schedule, fees, or acceptance criteria go through a formal Change Order signed by both project managers. The Change Order must identify what changed and what it means for timeline and cost. No email, ticket, or verbal request can alter the commercial terms — a rule that protects both sides.

Secure Development Practices

The agreement moves security from aspirational exhibit language into operative terms. It requires commercially reasonable development standards, dependency tracking through a software bill of materials (SBOM), tiered vulnerability remediation timelines based on severity, security incident notification, and least-privilege access controls for production environments. These are not theoretical — they reflect the baseline that institutional customers and acquirers increasingly expect.

Component and AI Provenance Register

Exhibit C requires the developer to inventory every component — pre-existing developer tools, customer materials, new work product, third-party commercial software, open-source packages, and AI-assisted code. For each component, the register captures ownership, license type, and restrictions. This transparency is critical for IP due diligence and ensures the customer knows exactly what license obligations come with the delivered software.

Termination and Transition

The agreement covers termination for cause, convenience, and insolvency, with clear rules for each. On any termination, the developer must hand over work-in-progress with source code and build instructions. The work-in-progress rights follow the IP model — under customer-owned, ownership vests upon payment; under developer-owned, the customer gets a license to what has been paid for. Exhibit D covers the full transition checklist: repository handoff, credential transfer, knowledge sessions, and data export.

Emerging Provisions (2025–2026)

AI-Assisted Development Disclosure

With code-generation tools now standard in development workflows, the agreement requires disclosure of AI tool usage in Exhibit C, along with representations that AI-assisted output has been reviewed for accuracy, licensing compliance, and security. The developer bears the risk if AI-generated code fails acceptance criteria — keeping accountability where it belongs regardless of the tooling used to write the code.

Software Bill of Materials (SBOM)

Following the trajectory set by Executive Order 14028 and CISA guidance on software supply chain security, the agreement includes SBOM delivery requirements with configurable timing. This is increasingly becoming a baseline expectation for enterprise customers and regulated industries, and having the infrastructure in the development agreement means the developer is tracking dependencies from the start rather than scrambling to produce an inventory at delivery.

Tiered Vulnerability Remediation

Rather than treating all security issues the same way, the agreement establishes CVSS-based remediation timelines — critical vulnerabilities within 5 business days, high within 15, and medium in the next scheduled release. This approach acknowledges that not every vulnerability is an emergency while ensuring that genuinely critical issues get immediate attention.

Liability Carve-Outs with Super-Caps

The limitation-of-liability section uses a modern structure that carves out specific high-risk categories (confidentiality breaches, data security, IP indemnification) from the general cap, but subjects those carve-outs to a “super-cap” — typically 2x the base cap. This prevents unlimited exposure while acknowledging that certain breaches can cause disproportionate harm.

How to Use This Template

Download the template and start with the Agreement Summary table, selecting the IP model that fits your situation. If you are a startup hiring a developer to build your core product, Option B (Customer-Owned) is typically the right choice. If you are engaging a firm that builds on a proprietary platform, Option A (Developer-Owned with license) may be more realistic. Option C works for complex projects where different components warrant different treatment.

The exhibits are where most of the project-specific work happens. Exhibit A should be developed collaboratively — the more specific the acceptance criteria, the fewer disputes later. Exhibit C (the Component Register) should be started early and updated as development progresses, not filled in at the end as an afterthought. Have counsel review the agreement before execution, particularly the IP, indemnification, and liability provisions.

This template is provided by Montague Law for informational and educational purposes. It does not constitute legal advice and does not create an attorney-client relationship. Software development engagements involve complex intellectual property, liability, and data protection considerations. Consult qualified legal counsel before using this template. Montague Law is a Florida-based law firm focused on corporate, M&A, venture capital, and technology transactions.