A 90-day growth sprint is a fixed-scope engagement to diagnose what is broken in your growth engine, rebuild the infrastructure, and hand off working systems to your team. It replaces the open-ended retainer model where consultants and agencies work monthly with no defined endpoint or deliverables.
At MIMR Growth Lab, the scope and the success metrics are agreed in writing before week one. If day 90 arrives and the metrics have not, day 90 is a checkpoint rather than an exit.
How the 90-day growth sprint works
Phase 1: ICP & Market Mapping (Weeks 1-2)
Before anything gets built, I find out who actually buys and why. For pre-PMF teams this is the whole foundation. For teams with an engine already running, the same work doubles as the audit: it exposes exactly where the current one leaks.
What happens:
- Up to 24 customer interviews across target segments
- Positioning and the wedge you can own, in the words buyers use
- Competitor and channel landscape mapping
- For existing engines: full funnel teardown, attribution audit, and CRM review (where leads enter, stall and die)
- Baseline metrics for every stage, and a plan ranked by revenue impact, not effort
Most companies skip straight to tactics (“run more ads”) without understanding where the real problem is. A CPA firm was renting every lead it had through paid marketing but had zero organic presence. The research showed the paid budget could be replaced with organic infrastructure, and it was retired over 18 months as organic took the load.
Phase 2: Measurement & Funnel (Weeks 3-6)
Tracking before spend, always. Then the funnel itself: offer, page, follow-up, CRM. Everything is instrumented, so the channel decisions in phase three run on data instead of opinion.
What gets built (varies by what phase one found):
- Measurement and attribution - GA4, GTM, server-side tracking (Meta CAPI), event taxonomy, dashboards
- Offer and landing page - built from the interview language
- Follow-up automation - email sequences, SMS triggers and CRM workflows that keep deals alive
- CRM, routing and lead scoring - rules that score leads by fit and intent and route them to the right person
Real example: a scaling med-tech SaaS had 67% of MQLs dying post-demo. In this phase I built the lead scoring model and the nurture flows. The post-demo leak closed and the pipeline behind it recovered inside 90 days.
Phase 3: Channel Bets (Weeks 7-10)
Small, structured tests across the likeliest channels: outbound, paid, content, partnerships. Losers die in weeks, not quarters. The first channel that repeats gets the budget.
What happens:
- Kill criteria agreed before each test starts
- Weekly readouts wired to pipeline, not clicks
- Budget flows to what repeats
- The winning channel documented as a playbook
Phase 4: Team Enablement (Weeks 11-12)
The part most consultants skip, because dependency pays better than handoff. The goal is systems that outlast the engagement.
What happens:
- Your team trained on every system built
- Every system and workflow documented in plain language
- Dashboards and monitoring live, with alerts
- Playbooks for ongoing optimization
The goal: your team owns and operates the systems, with no dependency on me. One tattoo studio chain’s blueprint was still compounding 14 months after I left, and a CPA firm’s organic traffic kept growing without me. That is what a proper handoff looks like.
How the sprint model compares
| Provider | Model | Defined end | Success metrics in writing |
|---|---|---|---|
| MIMR Growth Lab | Fixed scope, 90 days | Yes | Yes, before week 1 |
| Typical RevOps consultant | Project-based | Usually | Varies |
| Fractional CMO | 6-12 month retainer | No | Rarely |
| Marketing agency | 12-month retainer | No | No |
The sprint model is a defined scope with a built-in exit. Agency and fractional models are ongoing engagements with no exit designed in.
Why 90 days works
90 days is the right duration for three reasons:
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Long enough to build - You cannot audit, build, and deploy meaningful systems in 30 days. You also cannot train a team and verify results in 60. 90 days gives enough time for all three phases.
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Short enough to stay focused - Engagements longer than 90 days tend to lose urgency. The operator becomes embedded, scope creeps, and the engagement starts feeling like a retainer. A hard 90-day deadline forces prioritization.
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Fast enough to measure - At 90 days, you can already see whether the systems are working. A B2B software company saw 40% CAC reduction within the sprint window. A professional services firm saw 60% faster close rates. If it is working at 90 days, the system is sound.
What you get at the end
After a 90-day sprint, you should have:
- Working attribution - You can see which channels, campaigns, and touchpoints drive revenue
- Automated pipeline - Leads are scored, routed, and followed up without manual intervention
- Clear measurement - Dashboards showing pipeline health, conversion rates, and revenue impact
- Documented systems - Every workflow, every automation, every process documented for your team
- Trained team - Your internal team can operate, monitor, and optimize the systems
- Growth roadmap - A plan for the next 90-180 days based on what was learned
Who this is for
A 90-day growth sprint works best for:
- Early-stage startups building their first growth engine, including pre-PMF teams still validating what to sell and who buys it
- B2B startups with an unstable or founder-dependent pipeline
- Service businesses with high customer acquisition costs and inconsistent close rates
- Teams that need a builder - not another advisor who delivers slide decks
- Founders who want to own their growth engine without hiring a full team
It does not work for:
- Companies that need ongoing marketing leadership (hire a fractional CMO)
- Companies looking for quick-fix campaign management (hire an agency)
Success metrics, agreed in writing
At MIMR Growth Lab, I agree the metrics with you in writing before week one. If day 90 arrives before they do, the engagement is not over: day 90 is a checkpoint, not an exit, and I finish what I scoped.
This works because:
- Metrics are agreed upfront during the audit phase, not after
- The operator has direct control over the systems they build
- 90 days is enough time to see real impact if the systems are well-built
- The operator is incentivized to build durable systems, not fragile ones
Capacity: 3 clients per quarter, so the calendar is the real constraint.
Ready for a 90-day growth sprint? Book a diagnostic call to discuss whether your growth engine needs a rebuild. Or explore the free growth tools to start diagnosing yourself.