SaaS Validation Sprint
Most SaaS projects lose between €80,000 and €250,000 on a product that never finds its market. The JAK Solutions Validation Sprint gives you real market evidence in two weeks: functional prototype, user testing, Go/Pivot/Kill recommendation.
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The complete guide to launching a SaaS prototype in 14 days
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The problem
Every year, ambitious leaders commit significant budgets to build a SaaS product. And too often, they discover, too late, that the product they built doesn't match the market they thought they understood. This isn't about bad developers or poor execution. It's the absence of one critical step: validate before you build.
| Stage | Typical cost | Time invested | Validation level |
|---|---|---|---|
| Internal thinking & scoping | €5,000 to €15,000 | 4 to 8 weeks | No real validation |
| Full development | €60,000 to €180,000 | 4 to 7 months | Still no validation |
| Launch & discovery of problems | €10,000 to €30,000 | 1 to 3 months | First real feedback |
| Rebuild or pivot | €40,000 to €100,000 | 3 to 6 months | Too late: budget is gone |
| Total (worst case) | €115,000 to €325,000+ | 12 to 24 months | Confirmed failure |
Why SaaS products fail
These aren't theoretical. Each corresponds to a specific trap that the 14-Day Sprint methodology is designed to avoid before it costs you time and money.
01
Internal stakeholders assume they already understand the user, how the product works and whether customers will pay. They proceed as if these convictions were facts, when founders are not their customers and CEOs are not their end users.
Typical cost: €40,000 to €120,000
02
Founders feel pressure to show investors something clickable. The result is often a rushed, unvalidated product launched too early just to have “something to show”. Seed and Pre-Series A investors don't want a finished product: they want traction.
Typical cost: €20,000 to €80,000
03
When an internal team proposes a new SaaS, the idea is evaluated by colleagues who share the same assumptions as those who designed it. The product works perfectly in a controlled internal test, and fails the moment it meets real users who have no patience for friction.
Typical cost: €30,000 to €100,000
04
As the product takes shape, stakeholders keep adding features. Marketing wants a dashboard. Sales wants an API. The CEO wants AI. By the time real users see it, every feature added before validation may be completely useless, and has consumed budget that could have been used to learn.
Typical cost: €15,000 to €60,000
The smarter alternative
The alternative to building before validating is not to slow down. It's to move smarter. This approach gives you concrete market evidence in days rather than months, and lets you make investment decisions based on real data, not assumptions.
Step 01
Build a testable, functional representation of your core workflow, in days, not months.
Days 1 to 7
Step 02
Expose the prototype to real target users: external, unbiased, from your actual market.
Days 8 to 10
Step 03
Analyse behaviours, feedback and conversion signals to produce a data-driven report.
Days 11 to 12
Step 04
Invest in full development with complete confidence, with a validated scope and predictable ROI.
After the sprint
7 days of focused work produce a prototype that real users can actually test: one core workflow, live data, not a static mockup.
Beyond two weeks, the prototype becomes a product. Features creep in, scope expands, and validation discipline disappears.
You can go from “we have an idea” to “we have traction data” in one month, slotting between two investor meetings.
At €5,990 fixed price, the sprint is repeatable. If data recommends a pivot, a second sprint can launch without burning your budget.
The sprint in detail
A structured 4-phase process designed to transform a concept into validated market signals in exactly two weeks. Each phase has a clear objective, a precise deliverable, and a defined decision point.
Days 1 to 2
The sprint begins with rigorous strategic discipline, not design or development. The JAK Solutions team works with you to define the core workflow the prototype must demonstrate.
Deliverable
Technical & Strategic Blueprint
Days 3 to 7
In five intensive days, the team builds a fully functional, clickable prototype covering the entire user journey. This is not a wireframe or a limited Figma mockup: it's a real environment with live data, authentic interactions, and natural navigation.
Deliverable
Functional, navigable prototype
Days 8 to 12
Phase 3 confronts the hypothesis with reality. Real users from your target market, not your contact list, interact with the prototype. Their behaviour is observed, recorded and analysed using a structured protocol.
Deliverable
Validation report with behavioural data
Days 13 to 14
The final phase transforms data into decisions. JAK Solutions synthesises everything collected in Phase 3 and delivers a clear, actionable strategic recommendation: one of three outcomes, each with complete rationale.
Deliverable
Full development roadmap, investor-ready traction summary, Go/Pivot/Kill recommendation
Who it's for
Identifying your profile helps you determine whether this methodology fits and how to position the sprint internally to get stakeholder buy-in.
Profile 1
Profile 2
Case studies
These two projects illustrate how the JAK Solutions methodology has been applied in different contexts, and the measurable outcomes that followed.
Construction · Belgium
The Cobria CEO identified a real gap: existing software for Belgian construction SMEs was either too generic or too expensive. Their internal CRM had reached its limits, and dependence on a single developer was a major risk.
JAK Solutions proposed a fully custom SaaS tailored to the industry, capable not only of solving Cobria's internal problems but of becoming a commercial product. The first version was delivered in 6 months, with immediate onboarding on real construction sites.
The Cobria CEO spotted an opportunity in their sector and dared to act on it. JAK Solutions brought the structured framework to turn that vision into reality, within the agreed timeline and scope.
GO → Launched
Events · VO Group (~100 FTE)
My Impact Tool started as an internal tool built by JAK Solutions for VO Group: proprietary software to calculate and report the ecological impact of corporate events. It worked so well internally that the CEO saw a broader opportunity.
Validation revealed a key insight: event agency account managers had one absolute priority, generating a ready-to-export PDF report for each client event, with zero manual data manipulation. This single finding shaped the entire productisation roadmap.
Key lesson: an internal tool can become a commercial product, but only when real user priorities are identified before full development begins.
GO → Commercial SaaS
Pricing & deliverables
The JAK Solutions 14-Day Validation Sprint is offered at a single fixed price. This model exists for one reason: when you're investing in validation, the last thing you need is budget uncertainty.
Validation Sprint · 14 days
€5,990
Fixed-price guarantee & all phases included
Overrun guaranteeIf JAK Solutions exceeds €5,990, the difference is absorbed by the agency, never passed on to you.
Timeline guarantee14 calendar days from the strategy workshop to delivery of the final report.
Locked scopeSet at the end of Phase 1. No additional costs can arise during the sprint.
Real users recruited by JAKMinimum 8 to 12 participants from your target market, recruited directly by the agency.
Technical & Strategic Blueprint. Reference document from the Phase 1 strategy workshop
Functional, navigable prototype. Real environment, connected data, complete user journey
User validation report. Behavioural data from 8 to 12 real-user testing sessions
Go/Pivot/Kill recommendation. Fully documented rationale, based on real market data
Investor-ready traction summary. Engagement data, user quotes, conversion metrics
Complete development roadmap. Phase-by-phase cost estimates with validated scope, ready for funding
Brand & launch strategy. Positioning and go-to-market plan for the post-validation phase
Comparison
| Criteria | JAK Solutions | Traditional agency |
|---|---|---|
| Validation before build | Always built in | Rarely proposed |
| Fixed-price guarantee | €5,990, overrun paid by JAK | Estimates only, changes billed separately |
| User testing included | 8 to 12 external users recruited by JAK | Not standard, client's responsibility |
| Time to first market evidence | 14 calendar days | 4 to 9 months after full development |
| Investor-ready output | Traction report with real engagement data | Deliverable is code, the investor narrative is your problem |
| Go/Pivot/Kill recommendation | Delivered with full documented rationale | Not provided, you assess product-market fit yourself |
| Minimum investment to start | €5,990 | €60,000 to €200,000 for a full build |
A structured 14-day process that tests your concept with real users before any major investment. It includes a functional prototype, testing sessions, and a Go/Pivot/Kill recommendation based on real data, not internal assumptions.
The Sprint is offered at a fixed guaranteed price of €5,990, all phases included. If our internal costs exceed that, JAK Solutions absorbs the difference. Your budget is locked at the end of Phase 1 and cannot change during the sprint.
JAK Solutions directly recruits a minimum of 8 to 12 participants from your defined target market. These are not colleagues or internal testers: they are genuine external users with no prior knowledge of your product.
A PIVOT outcome means the sprint identified a misalignment but also revealed a clearer opportunity. JAK Solutions documents the refined hypothesis and can plan a second 14-day sprint on the revised concept at the same fixed price of €5,990. Many of our strongest projects came from a first-sprint pivot.
Yes. The sprint is designed for decision-makers with deep domain expertise but no technical background. JAK Solutions handles all design, development and testing logistics. Your role is to define the business hypothesis, we handle everything else.
JAK Solutions primarily serves French-speaking Europe: Belgium (Wallonia and Brussels), Luxembourg, France and Switzerland. If your business operates outside these markets but your decision-maker engages in French, contact us: we evaluate each situation individually.
You receive a functional prototype, a user testing report with behavioural data from 8 to 12 participants, a documented Go/Pivot/Kill recommendation, an investor-ready traction summary, a full development roadmap with phase-by-phase cost estimates, and a brand and launch strategy.
14 days represent the optimal balance between speed and quality of learning. Fewer than 14 days and the prototype can't be complete enough for meaningful testing. More than 14 days and scope creeps while validation discipline gives way to a development mindset.
Are you eligible?
It's designed for a specific type of leader facing a specific challenge. This framework helps you determine whether you're eligible and whether the timing is right.
Eligible
Not eligible right now
Most founders spend €100,000 before discovering nobody wants their product. JAK Solutions gives you validated market evidence in two weeks, at a fixed price, before any commitment to full development. If we go over budget, we pay the difference. Your risk is zero.
No commitment · Honest diagnosis · No sales pitch if the sprint isn't the right fit