How to Write an RFP for Custom Software (That Gets Useful Proposals)
By Torq Studio
Procurement and engineering leaders: what to include in an RFP so vendors respond with comparable, realistic bids—and fewer surprises later.
A weak RFP attracts generic proposals or wildly divergent numbers. A strong one aligns internal stakeholders, sets evaluation criteria, and lets good vendors differentiate honestly. This guide is for teams buying bespoke mobile, web, or platform work.
Start with outcomes, not feature lists
List the business outcomes and constraints: users, regions, integrations, compliance, uptime, and launch window. A bullet list of screens is useful as an appendix, not a substitute for goals. Great vendors will propose the right features once they understand the job.
Technical context vendors actually need
Share your current stack, APIs, identity model, hosting preferences, and any non-negotiables (e.g. on-prem, specific cloud). Redact secrets, but do not hide architecture—unknowns become padding in estimates.
Ask for how they will deliver, not just price
Request methodology: discovery length, sprint cadence, testing approach, definition of done, and how change is handled. Ask for references comparable in size and risk. Price without process is not comparable.
Evaluation matrix
Weight criteria up front: fit, velocity risk, security posture, support model, IP terms. Score blindly where possible to reduce bias. Leave room for a short paid discovery if scope is genuinely unclear—fixed bids on fuzzy specs hurt both sides.
Appendix checklist
- Success metrics and acceptance tests (even draft).
- Data flows and third-party systems.
- Roles on your side (product owner, technical approver).
- Commercial model preference (fixed phases vs retainer).
We respond to well-structured RFPs with phased proposals. If you are drafting one, we are happy to review it before you go to market.