INDUSTRIES / E-COMMERCE & ADTECH

Your platforms all work. The revenue leaks at the seams between them.

For commerce operators, the seam runs between cart, checkout, billing, catalogue, inventory and fulfilment. For publishers and AdTech teams, between impression, consent, auction, attribution and payout. Nobody sells you a product that owns a seam — so we build and repair the connective tissue between the platforms you already pay for, and instrument it so you see a leak before finance does.

The audit is a revenue-leak map: we trace how one order and one impression travel your stack — every system, every hand-off, every point where a human intervenes — and you keep the one-page diagram whether or not we ever work together. 30 minutes, no deck, an engineer on the call.

Social-media automation platform — the scheduling and publishing surface Fluvius architected and led from zero
Social automation SaaS · led from zero
Where this work happens

A captive-portal audience inside a shopping centre: unpredictable devices, hostile network conditions, and a footfall spike that arrives whether or not you are ready.

Fluvius engineers on site for the Westfield project in London
Westfield, on site · London

One order. One impression. The same anatomy of a leak.

FOLLOW THE VALUE ↓

The toggle is the point: both journeys have the same shape. A hand-off, a timeout budget, a signal that must survive the crossing, and a ledger at the end that either reconciles or quietly disagrees. Teams staff the boxes; the leaks live on the arrows.

Where the money leaks

11 LINE ITEMS · COMMERCE FIRST
COMMERCE — CART → FULFILMENT → LEDGER
01

Orders that stall between systems

The payment succeeded, the order exists, and nothing shipped — the webhook that hands it to the WMS timed out and nothing retried. Support finds it four days later, from the customer, because there is no reconciliation between “charged” and “fulfilled”.

02

Revenue leaving quietly through failed payments

A meaningful share of subscription churn is not a decision — it is a declined card, a dunning ladder that gives up too early, and expiry failures a card account updater would have caught. The churn dashboard never shows it as what it is.

03

Inventory truth that depends on the clock

One channel updates hourly, the 3PL feed lands once a day, SKUs are formatted three different ways — and the result is oversells, cancellations, and a returns rate finance blames on marketing.

04

Peak season as an annual act of faith

The stack has never been load-tested against the traffic it will actually see. Nobody knows which queue is the bottleneck. The plan is “watch it closely”.

05

Reporting nobody trusts

The storefront, the payment processor, the ad platforms and the accounting system produce four different revenue numbers — and the weekly meeting is spent arguing about which is right instead of what to do.

ADTECH & AUDIENCE — IMPRESSION → ATTRIBUTION → PAYOUT
06

Yield decisions made blind

Floors and bidder counts are tuned by feel, because there is no clean, queryable log of bid requests, responses, timeouts and wins — so nobody can tell whether partner thirteen adds demand or just adds latency.

07

Consent that costs money

A CMP misconfiguration, a missing TCF string or a broken GPP signal drops bid rates on a whole geography — and the first symptom is a revenue dip on a Monday with no obvious cause.

08

Identity after the cookie

First-party data lives in four places, match rates are guessed at, and “build our own audience graph” has sat on the roadmap for a year because nobody has the engineering capacity to start it.

09

Attribution changes that terrify everyone

Moving to server-side tagging or a Conversions API feed means touching the numbers the whole company is compensated on. So it does not happen — and measurement gets worse every quarter.

10

Payouts and commissions reconciled by hand

Postbacks fire twice or not at all, click IDs get lost on a redirect, and someone spends the last three days of each month in a spreadsheet deciding what a partner is owed.

11

List health that erodes silently

Growth counts signups; deliverability counts complaints. When the two definitions diverge, sender reputation moves before the dashboard does — and Gmail’s 0.3% complaint ceiling does not negotiate.

Interface we built

A booking has to mean the same thing to a card-present terminal on the counter and a subscription ledger in the cloud — through every reschedule, refund and failed renewal.

Payyus booking and payments interface integrated with Clover POS and ChargeBee
Payyus · one booking, two ledgers

The receipts

REAL PROJECTS · COMMERCE FIRST, THEN ADTECH & AUDIENCE
PAYYUSCLOVER POS · CHARGEBEE

Payments and booking for local businesses

One booking has to mean the same thing to a card-present terminal on the counter and a subscription ledger in the cloud — through every reschedule, refund and failed renewal.

READ THE CASE →
MAKECENTSSTRIPE · PAYPAL

Micro-donations that fund newsrooms

Small, frequent, multi-processor payments where fees, retries and payout timing decide the whole model. The engineering problem is reconciliation, not the checkout button.

READ THE CASE →
WESTFIELD · LONDONCAPTIVE PORTAL · 2019

The WiFi web experience inside a shopping centre

Unpredictable devices, hostile network conditions, one shot at the first three seconds — and a footfall spike that arrives whether or not you are ready.

PEAKVENTURESYIELD · 20+ COUNTRIES

Publisher monetisation and audience intelligence

AI-powered yield optimisation across 20+ markets — decisions landing inside an auction’s timeout budget, under consent regimes that differ by country.

NEWSLETTER-GROWTH SAASNEWSLETTER GROWTH

The platform behind engaged-subscriber growth

The largest driver of engaged subscribers to top US newsletters — a system that defends a definition of subscriber quality advertisers and deliverability both accept.

READ THE CASE →
SOCIAL AUTOMATION SAASZERO → MASS ADOPTION

A social-media marketing SaaS, led from zero

Architected and led from an empty repository to mass adoption across web, mobile, AR and smart devices — the audience-side platform work this page keeps referring to.

READ THE CASE →
Fluvius working from the PeakVentures office in Venice, Los Angeles
Working from the client’s office · Venice, LA

We work where the seams are — in your systems, with your team.

Want this level of specificity about your own stack?

That is literally what the audit produces: a one-page diagram of how one order and one impression travel your systems today, with the leak points marked. Yours to keep.

What we build and repair at the seams

6 ENGAGEMENTS · EACH WITH ITS TRIGGER
SEAM 01

Checkout, billing and payment recovery engineering

Subscription lifecycle on Stripe Billing or ChargeBee, dunning and retry strategy, SCA and 3-D Secure handling, card-present and card-not-present flows on Clover — and keeping payment-page scope small enough that PCI DSS questions stay boring.

YOU’D HIRE US WHEN: churn is rising and nobody can say what share of it is really just declined cards.
SEAM 02

Order, inventory and fulfilment integration

OMS, WMS and 3PL wiring, SKU and catalogue mapping across channels, idempotent webhook handling with replay, and reconciliation jobs that prove “charged” and “shipped” agree — with alerting on the orders that fall between.

YOU’D HIRE US WHEN: support keeps finding orders that were paid days ago and never left the warehouse.
SEAM 03

Peak-season reliability work

Load-testing the real path an order takes, finding the queue that gives out first, adding back-pressure and graceful degradation — done in a low season, so nobody has to be brave in November.

YOU’D HIRE US WHEN: last peak was survived rather than handled, and this year’s plan is still “watch it closely”.
SEAM 04

AdTech and yield engineering

Prebid wrapper and timeout tuning backed by an actual event log, ad-server integration, consent plumbing for TCF and GPP, and first-party data and identity work that survives the cookie.

YOU’D HIRE US WHEN: a bid-rate dip costs a week of guessing because there is no log to query.
SEAM 05

Measurement, attribution and payout systems

Server-side tagging and Conversions API pipelines, S2S postback and click-ID integrity, commission and affiliate reconciliation — and revenue reporting one number can be defended from.

YOU’D HIRE US WHEN: month-end payouts still finish in a spreadsheet, three days late, on one person’s laptop.
SEAM 06

LLM work on messy operational data

Our genuine edge: extracting structure from supplier files, partner reports and support threads; anomaly detection on order, bid and payout streams; natural-language query over operational data, so an ops lead can ask a question without opening a ticket.

YOU’D HIRE US WHEN: the answer exists in your data and still takes a developer and two days to reach.
Interface we built

“Engaged” is the whole product: the system has to defend a definition of subscriber quality that advertisers and deliverability both accept.

A newsletter-growth dashboard and embeddable banner builder built for a US SaaS
Newsletter growth · dashboard and builder

The objections, answered in the open

WHAT YOU’RE ACTUALLY THINKING
“You’re an agency, not a commerce platform — we already have one.”
Correct, and we are not trying to replace it. We do not build storefronts. We build and fix the systems behind the storefront: checkout, billing, POS, catalogue, fulfilment, reporting. Your platform stays; the seams stop leaking.
“Our peak season is not the time to experiment.”
Agreed — which is why this work is scoped for the quiet months. Load-test the real order path now, find the queue that fails first now, and go into peak with a rollback plan instead of a prayer. We will say no to a risky change in November.
“Our data is our business — privacy and consent are not negotiable.”
Consent is treated as a revenue system, not a legal checkbox: TCF and GPP signals validated end to end, server-side collection with a documented data path, least-privilege access to production. We hold no SOC 2 or ISO 27001 certification and will not pretend otherwise — we describe the practices we actually follow.
“We tried an offshore team once. It failed.”
You get direct access to the senior engineers doing the work — no account-manager layer — and a senior architect signs off on every project. EU hours with a full US-morning overlap. The verifiable record: a 100% Job Success Score on Upwork and 4.9/5 on Clutch, across 200+ clients — many of whom have worked with us for 7+ years straight.
“Changing attribution or reporting will break our revenue numbers.”
We run the new pipeline in parallel with the old one, reconcile the two until the delta is explainable, and only then switch. Nobody’s compensation plan changes on a guess.
“What if the first month goes badly?”
The first 30 days of any engagement are a trial period, and either side can end it in that window without notice and without a penalty. It is in the agreement rather than in a sales conversation. A month of real work tells both of us more than another round of evaluation would.
“Who owns what you build — including anything a subcontractor touches?”
You do, at every stage: source, documentation, infrastructure and credentials. The transfer is worldwide, with no time limit and no territorial limit, and anyone we bring onto the work assigns their intellectual property to you in writing before they touch it — the clause most agreements leave out, and the one that matters on the day you raise or sell.
On the road

We meet the people who run commerce and audience businesses where they gather — and most of this page came out of those conversations.

Our deck, on the floor · San Francisco

In clients’ own words

VERIFY ON UPWORK →
★★★★★  5.0
“They understood a difficult brief and delivered everything professionally, on time and on budget. I hope we have the opportunity to work together again soon.”
Westfield — UX improvement
Verified Upwork review
★★★★★  5.0
“Very professional and excellent service!”
Client — payment & licence verification integration · 2025
Verified Upwork review
200+ clients · 100% Job Success on Upwork · 4.9 / 5 on Clutch
NOT READY TO TALK? START WITH THE LIST.

The 19 places order and impression revenue leaks

A pre-peak-season checklist, five pages, printable. Ten leaks on the order path, nine on the impression path — each with one concrete way to prove it is not happening to you. The rule inside: tick a box only when you can prove the answer with a query, a log or a reconciliation.

One email, no phone number, no company-size dropdown. Free and disposable email domains are filtered — the download link appears right here after the address clears.

Map your leaks before peak season does

30 MINUTES · NO DECK · YOU KEEP THE DIAGRAM

The Data Flow Audit is 30 minutes with an engineer — not a salesperson. We map how a single order and a single impression travel through your stack today: every system they touch, every hand-off, every place a human has to intervene, and every point where the two halves of your reporting stop agreeing.

  • You keep the one-page diagram, whatever happens next
  • Bring read-only sight of your stack — or just a whiteboard
  • An engineer on the call, not a salesperson
PREFER TO WRITE FIRST?REPLY IN 1 BUSINESS DAY

RELATED TECHNOLOGIES → Node.js/Nest.js & React.js FastAPI, Django & Flask AWS, GCP, Kubernetes & Cloudflare All technologies
RELATED SERVICES → E-commerce Development API Integrations UI/UX & Product Design Full-Stack Web Development All services