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Tracking & attribution engineeringClient work

Conversions Collapsed Overnight: Emergency Read-Only Diagnosis

A read-only reconstruction of the failure window: what changed, when, and what it did to your numbers, with confirmed findings kept apart.

For
Any advertiser whose conversions collapsed
Checked

Sounds familiar?

Tick what applies to you

The situation Tracking & attribution engineering
One morning the leads or sales are gone and no one changed anything — or so it looks.

Tick the lines that describe your case.

Describe my task

How I solve it

What I build

I build a read-only reconstruction of the failure window. I pull the platform data and the change history, compare a clean baseline with the broken period, and rank the causes by evidence. Confirmed findings are kept separate from unconfirmed ones. You get a written answer and a next step — and nothing is changed on your account while I look.

The process

How it works

6 steps. Scope and a fixed price are agreed before the first one.

  1. Agree the window: when it worked, when it broke, and what "broke" means in numbers.

  2. Pull read-only data: platform insights, event counts, and change history for the period.

  3. Split the data by the dimensions that matter — device, placement, event type, source — to localise the break.

  4. Test hypotheses against a control, so a drop is not mistaken for noise.

  5. Write the verdict: what changed, what it did, and how confident I am.

  6. Give you the ranked next checks, whether you act with me or without me.

Handover

What you get

A read-only diagnosis: what changed, when, and what it did to your numbers. Confirmed findings kept apart from unconfirmed ones. A ranked list of causes with the evidence for each, and the next checks to run. You can take it to your team or another specialist; implementation is a separate engagement.

Built with

  • Meta Ads Manager and Events Manager
  • Google Ads and GA4
  • Shopify admin reads
  • read-only pullers
  • spreadsheets and CSV analysis
  • statistical testing
  • written and PDF reporting

Proof

Done before, with dates and numbers

Client work Done for real clients. Client details are anonymised.

Before → after

Before, a US education provider’s lead campaigns collapsed overnight while spend and page views held. The reconstruction localised the break after the landing-page view: lead conversion on the main ad set fell from 2.2% to 0.5% while clicks and page views did not move, reconstructed on 2026-05-14.

  • US education provider

    read-only forensic reconstruction 2026-05

    2.2% to 0.5%

    landing-page view to lead conversion 2.2% → 0.5% on the main ad set while clicks and page views held.

  • US home-safety products store

    delivered 2026-08

    attribution drop traced to a consent change and proved with a difference-in-differences test, p = 0.0002; re-checked 2026-09-02.

  • Closed emergency work on Upwork

    2025–26

    Meta attribution reading zero while sales continued, collection purchase limits, a countdown app and order notes, an app install and database move.

Rated 5 out of 5 on Upwork.

I gave a unclear brief as I was unsure what the tracking issue was, but [he] fixed the issue very quickly and with great communication.

Jack B., BW Ecommerce Limited Upwork · 2016

What you can look at

A redrawn timeline of the failure window — baseline against failure, with the events that moved and the tests used — on synthetic numbers that keep the real ratios, with all campaigns, ids and account names removed.

Client details anonymised. Figures come from read-only platform access and client delivery records on the dates shown; some details altered for anonymity. I am the founder of Fixel Pixel.

Price and timeline

What it costs and how it runs

A Working Session answers one pre-chosen question in up to 60 minutes with a short written summary. A Health Check is the read-only written verdict, delivered two working days after the kickoff and confirmed access. Both are diagnosis; neither forces an implementation.

QuoteFixed before work starts

Price
Technical Working Session USD 195 for one pre-chosen question with a short written summary. Tracking Health Check USD 395 when you need a written, read-only verdict: one store, one agreed problem, up to three agreed systems, delivered two working days after the kickoff and confirmed access. Discussing the task is free.
Timeline
Working Session: up to 60 minutes plus a short written summary. Health Check: written verdict two working days after the kickoff is done and sufficient read-only access is confirmed, Europe/Madrid, weekends excluded.
First step
Describe the task. I reply within one working day, free, and tell you which option fits — or that you can fix it yourself.
Describe a task like this

A note from Daniilbefore you decide

When you don’t need this

If your conversions are stable and someone on your team reads the platform diagnostics every day, you don’t need me. A read-only diagnosis is the wrong buy when you already know the cause and only need it fixed — that is a Focused Fix instead. And if the drop is clearly a bad ad rather than a broken measurement, I will say so; that happened, and I declined to sell a rebuild.

— Daniil

Questions

What people ask about this

Will you change anything in my accounts?

No. The diagnosis is read-only: access to read data, and nothing that can write. If a fix is needed, it is a separate, approved job.

How fast can you start?

The Health Check clock starts once the kickoff is done and access is confirmed sufficient — not before. That keeps the two-working-day promise honest.

What if the cause is not provable?

Then the report says so. You get the confirmed findings, the open hypotheses, and the specific checks that would settle each one — not a confident story.

Can you work from screenshots and exports if I cannot grant access?

Often, yes, for a first read. It limits the confidence level, and the report will say which findings are weaker because of it.

More like this

All situations
Daniil Maximkin

Hi, I’m Daniil.

I work with you from defining the problem to implementation and handover. You talk to the person who does the work. I work in English and Russian.

My story My work

Have a task like this?

Describe your task

The first answer is free, within one working day. Or write directly: next@taskfordaniel.com