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Sunday Sarnie

(01) The Advisory Arm

Straight advice / freshly baked

Raise better.
Nudge smarter.

Sunday Sarnie Advisory works with early-stage founders on the two things that compound: how investors read your raise — and how users behave inside your product.

70% behavioural economics — 30% raise readiness

(02) The Practice

Two disciplines. one compounding advantage.

We bring judgement from both sides of the table. Years spent reading decks as investors taught us exactly where a raise narrative breaks — and why.

The same lens applies inside your product: how people actually choose, hesitate and come back. We apply behavioural economics to user behaviour, then measure it.

Behavioural economics — 70%
Raise readiness — 30%
70%
behavioural economics on retainer
30%
raise readiness, fixed fee
48HRS
a straight answer on any enquiry
ZERO
success fees, no arranging, no conflicts

(03) What we do

01

Raise readiness.

Fixed fee

Before you walk into a partner meeting, we read your raise the way investors will. A narrative audit, a line-by-line deck teardown, a sober model review and a data room that answers questions before they're asked — plus the investor psychology that sits underneath all of it.

  • Narrative audit
  • Deck teardown
  • Model review
  • Data-room prep
  • Investor psychology
Fixed fee only. No success fees, no arranging — advice, not deals.
02

Fractional behavioural officer.

Monthly retainer

A behavioural economist embedded in your team, part-time. We redesign pricing architecture, activation nudges, choice architecture and retention loops — and design the experiments that prove which ones work.

  • Pricing architecture
  • Activation nudges
  • Choice architecture
  • Retention loops
  • Experiment design
Every month ships an experiment plan with a metric it's accountable to. If it doesn't move, we say so — and change it.

(04) Process

How an engagement actually works.

  1. (01)

    Diagnose

    We read everything, talk to your team and deliver a written verdict: what's working, what isn't, and what to do first.

    Two weeks · fixed fee
  2. (02)

    Sprint

    One problem, ninety days. A raise narrative rebuilt or an activation funnel re-architected — shipped and measured.

    Ninety days · one problem
  3. (03)

    Retain

    Fractional, ongoing. We stay in the room for the decisions that compound, month after month.

    Ongoing · fractional

(05) Why us

From the other side of the table.

We've read the decks.

Our background is venture. We know what makes a partner lean in — and the slide where they quietly stop reading.

Behaviour, not vibes.

Applied behavioural economics, grounded in evidence and tied to measurable lift. No growth hacks, no hunches.

Clean by design.

Fixed fees and retainers only. No success fees, no arranging, no conflicts. Our only incentive is the advice.

The Sunday Sarnie rule

If we wouldn't defend it in a partner meeting, it doesn't go in your deck.

(06) Contact

Start the conversation.

A straight answer within 48 hours. Or write directly: advisory@sundaysarnie.com

Lands directly with us — straight answer within 48 hours.