To write a request for proposal for custom software, define the business problem, users, scope, constraints, integrations, security needs, timeline, response format, and scoring criteria before you ask vendors for pricing. A software development RFP works when it gives vendors enough context to estimate delivery risk and makes proposals easy to compare.
What a software development RFP should do
An RFP should convert an uncertain software idea into a buying document vendors can answer with a delivery plan, team model, assumptions, risks, and price range. It should reduce interpretation, expose trade-offs early, and give procurement a fair basis for comparing technical and commercial responses.
For custom software, the RFP has three jobs:
- Explain the business problem in plain language.
- Define what vendors must estimate, build, integrate, migrate, secure, or support.
- Standardize vendor responses so your team can compare them without guesswork.
A weak RFP asks for "a mobile app," "a CRM," or "an AI platform." A stronger RFP describes users, workflows, data, rules, systems, constraints, and success conditions.
For example, instead of asking for "a customer portal," describe who logs in, what they need to do, what data they can see, which systems provide that data, and what must happen when a task is complete.
If your team has a goal but not enough requirements, run a discovery phase before procurement. Attract Group's business analysis services can help turn stakeholder input, workflows, and constraints into a vendor-ready scope.
The RFP process from need to shortlist
The request for proposal process starts before the document is written. Confirm the business need, shape the scope, decide how vendors will be scored, invite a focused vendor list, run a controlled Q&A, then shortlist based on evidence rather than the loudest sales narrative.
A practical process looks like this:
- Confirm the problem. Define the business pain, target users, operational impact, and reason to buy now.
- Decide whether an RFP is needed. If the scope is still unclear, use discovery or an RFI first.
- Create the RFP package. Include scope, constraints, response format, timeline, evaluation method, and contract expectations.
- Select vendors to invite. Choose vendors with relevant software delivery experience, not only brand recognition.
- Run Q&A in one channel. Share answers with all invited vendors to keep the process fair.
- Score responses. Use the same criteria for every proposal.
- Shortlist and interview. Ask finalists to explain assumptions, risks, team structure, and first 30-60 days of delivery.
- Negotiate scope and contract. Refine deliverables, pricing model, governance, and change control.
Public software procurement guidance from 18F/GSA, DAU, and TechFAR points in the same direction: reduce large-batch risk, use modular delivery, and choose pricing based on project risk and incentives.
If internal stakeholders disagree on roadmap, budget, or technical direction, bring in IT consulting services before sending the document. Vendors can price uncertainty, but they cannot fix conflicting buyer priorities inside a proposal.
What to include in a software development RFP
A software RFP must include enough business, product, technical, delivery, and commercial information for vendors to propose the same work. If one bidder estimates a discovery phase and another assumes fixed features, your comparison will be weak before evaluation even begins.
The table below gives a practical RFP template you can adapt to your project.
| RFP section | What to include | Why it matters for software vendors |
|---|---|---|
| Executive summary | Business problem, project purpose, buyer organization, expected outcome | Helps vendors judge fit and respond with the right level of detail |
| Company background | Market, internal teams, current systems, operational context | Gives context for workflows, users, and constraints |
| User groups and workflows | Roles, permissions, main tasks, current pain points | Prevents feature lists from replacing real workflow design |
| Functional scope | Required modules, features, user stories, admin needs, reporting | Defines what must be estimated |
| Non-functional requirements | Performance, uptime, scalability, accessibility, browser/device support | Shapes architecture and infrastructure decisions |
| Integrations and data | APIs, third-party services, legacy systems, data migration, source of truth | Exposes technical risk early |
| Security and compliance | Authentication, authorization, audit logs, data privacy, regulatory needs | Helps vendors estimate controls, testing, and documentation |
| Technical constraints | Preferred stack, hosting, cloud provider, existing architecture, internal standards | Reduces rework and unsupported recommendations |
| Delivery model | Agile, fixed milestones, discovery first, team collaboration rules | Shows how work will be managed |
| Timeline | RFP dates, vendor Q&A, selection date, target start, target launch | Lets vendors plan team availability |
| Budget guidance | Range, cap, funding stage, pricing preference, payment terms | Reduces unrealistic proposals |
| Vendor response format | Required sections, page limits if any, pricing format, assumptions format | Makes proposals easier to compare |
| Evaluation method | Scoring factors, weights, interview process, decision owners | Tells vendors where to provide proof |
| Contract and support | IP ownership, maintenance, SLA needs, warranty, change control | Prevents commercial gaps after selection |
For a software development RFP, avoid locking vendors into your first assumed solution too early. Define the problem and constraints clearly, then let vendors explain trade-offs in architecture, team setup, release sequencing, and pricing.
Scope, budget, and timeline details vendors need
Vendors price uncertainty as much as effort. Clear scope, budget signals, and timeline constraints help them choose the right architecture, team size, pricing model, and delivery sequence. When these details are vague, serious vendors either add risk buffers or decline the RFP.
Start scope with business workflows, then move into features. A vendor can estimate "quote generation for shipping orders" more responsibly than "CRM module." Workflows reveal user roles, data rules, edge cases, and integration points.
A useful scope section should state:
- What users can do at launch.
- What admin teams can manage.
- Which features are mandatory for version one.
- Which features can move to later releases.
- What systems must integrate.
- What data must be migrated or cleaned.
- What analytics, dashboards, or reports are needed.
- What security, compliance, or audit rules apply.
The Movewheels CRM project is a good example of scope detail that matters. The product was a custom automobile CRM for a US car shipping company, delivered over 3-5 months with a $20,000-$50,000 budget range. Its modules included autoquoting, VoIP, email campaigns, and a performance dashboard. Integrations included Twilio, PayPal, Authorize.Net, Google Distance Matrix, MapQuest, Elasticsearch, and Mailgun.
That is the level of operational detail an RFP should request. Asking for "a CRM" would hide the real work. Asking vendors to explain autoquoting, communication flows, payment processing, mapping, search, and email delivery creates a much better estimate.
Budget should not be hidden if you want realistic proposals. You can share a target range, budget cap, or phased funding model. If you do not know the budget, ask vendors to price discovery separately and provide rough ranges for build options.
For pricing model, match the contract to the risk:
- Use fixed price for well-defined deliverables with stable requirements.
- Use time and materials for evolving products where discovery continues during delivery.
- Use milestone-based pricing for modular releases.
- Use a dedicated team model when you need long-term product capacity.
Timeline should separate procurement dates from delivery dates. Vendors need the RFP deadline, Q&A deadline, decision date, expected start date, target launch date, and any fixed business events that affect release planning.
Vendor evaluation criteria and scoring
Need a vendor-ready software RFP?
We can turn rough scope, stakeholder input, and technical constraints into a clear RFP vendors can price responsibly.
RFP evaluation criteria should measure proof, fit, and delivery risk, not presentation polish. Give vendors the scoring model in the RFP so they know what evidence to provide. Use weights that match your project: regulated platforms need heavier security review, while early products may favor discovery strength.
| Factor | Suggested weight | What good evidence looks like |
|---|---|---|
| Understanding of the business problem | 15% | Vendor restates workflows, users, constraints, and risks accurately |
| Technical approach | 15% | Clear architecture, integration plan, data approach, and trade-offs |
| Delivery method | 15% | Realistic phases, sprint or milestone structure, QA plan, release process |
| Team fit | 15% | Named roles, seniority, availability, communication model |
| Security and compliance | 10% | Practical controls, audit readiness, data handling, access management |
| Integration and migration experience | 10% | Relevant API, legacy system, payment, mapping, or CRM experience |
| Commercial fit | 10% | Transparent pricing, assumptions, payment schedule, change control |
| Governance and reporting | 5% | Cadence, status reporting, escalation path, decision process |
| References or case evidence | 5% | Comparable work with enough detail to assess relevance |
Keep the scoring simple enough for stakeholders to use. A 100-point model works well because trade-offs are visible. If two vendors are close, use interviews to test assumptions rather than changing weights after the fact.
Ask every evaluator to score independently before group discussion. This prevents a senior stakeholder from steering the room too early. Then compare notes on risks, missing answers, and areas where vendors made different assumptions.
For delivery governance, require the vendor to describe communication cadence, backlog ownership, acceptance criteria, reporting, and escalation. If your organization needs a stronger operating model, review Attract Group's project management services.
> Need help turning scope into an RFP vendors can price? Attract Group can support discovery, requirements shaping, vendor questions, and roadmap planning through business analysis services and IT consulting services.
Questions to ask before you send the RFP
Before sending the RFP, remove questions that your own team can answer and add questions that expose vendor assumptions. A short internal review prevents contradictory requirements, unrealistic timelines, missing stakeholders, and procurement language that pushes vendors toward safe but unhelpful replies.
Ask your internal team:
- What business problem must this software solve first?
- Which users are in scope for the first release?
- Which workflows are broken today?
- Which systems will remain the source of truth?
- Who owns data quality and migration decisions?
- What security or compliance rules are non-negotiable?
- What budget range can be shared?
- Which deadline is fixed, and why?
- Who will answer vendor questions?
- Who will score proposals?
- Who can approve scope changes during delivery?
- What would make a vendor unacceptable?
Then ask whether an RFP is the right next step. If you cannot describe users, workflows, integrations, and success conditions, start with discovery. If requirements are stable and procurement needs comparable pricing, send the RFP.
If you are selecting a build partner rather than only gathering estimates, ask vendors how they handle product thinking, engineering, QA, DevOps, and post-launch support. Attract Group's custom software development services page is a useful reference for the type of delivery capability buyers often need to assess.
How vendors should respond to your RFP
Vendor responses should follow your structure so evaluators can compare scope, approach, team, delivery plan, risks, and price without rebuilding every proposal by hand. Ask vendors to answer in a fixed order, state assumptions openly, and separate confirmed work from optional recommendations.
Request this response structure:
- Executive response. Vendor understanding of your business problem and proposed path.
- Scope response. Confirmation of included work, exclusions, assumptions, and open questions.
- Technical approach. Architecture, integrations, data, security, infrastructure, and testing.
- Delivery plan. Phases, timeline, team roles, ceremonies, acceptance process, and reporting.
- Risk register. Main delivery, technical, budget, timeline, and dependency risks.
- Pricing. Cost breakdown, pricing model, payment schedule, optional items, and change rules.
- Relevant experience. Similar projects, case evidence, references if available.
- Support model. Warranty, maintenance, monitoring, SLA options, and post-launch team.
Tell vendors not to bury assumptions in footnotes. Assumptions should be easy to find because they affect price and delivery risk.
Also ask vendors to identify where they disagree with the RFP. A strong vendor will point out missing discovery, risky timelines, vague integrations, or compliance gaps. That feedback is part of the buying signal.
FAQ
A good RFP answers practical buying questions before vendors write a proposal. The FAQ below covers timing, detail level, pricing, agile delivery, and evaluation. Use it to tighten the document before procurement sends it and to brief stakeholders who will score the responses.
How long should a software RFP be?
Most software RFPs work best at 8-20 pages, excluding appendices. Length matters less than clarity. If you need 50 pages to describe the project, separate background material from vendor response requirements.
Should we include a budget in the RFP?
Yes, include a range, cap, or funding stage if possible. Budget guidance helps vendors propose the right scope and team. If you cannot share a number, ask for phased options and require assumptions behind each price.
Can an RFP support agile delivery?
Yes. An RFP can request agile delivery while still defining business goals, constraints, initial scope, governance, and evaluation criteria. Avoid pretending every feature is fixed if discovery and iteration are expected.
How many vendors should receive the RFP?
Invite enough vendors to compare options, but not so many that review quality drops. For most custom software projects, 3-6 serious vendors is more useful than a broad, unfocused list.
What is the difference between an RFI, RFP, and RFQ?
An RFI gathers market information before scope is ready. An RFP asks vendors to propose an approach, team, timeline, and price. An RFQ asks for pricing on well-defined work or products.
What is the fastest way to write a request for proposal?
Start with the business problem, users, workflows, integrations, constraints, timeline, budget guidance, response format, and scoring model. Then remove vague feature requests and replace them with operational detail vendors can estimate.
