Amazon Full-Service Agency

We make brands
rise on Amazon.

Profitably.

Work with usHow we work

Everything your brand needs
on Amazon. Under one roof.

The six things we manage day-to-day for every client. And yes, there's more where that came from.

01

Advertising & PPC

Advertising & PPC

Full-funnel Sponsored ads across Products, Brands, and Display. Strategy and weekly optimization driven by contribution margin. ROAS alone doesn't pay the bills.

Full-funnel Sponsored ads across Products, Brands, and Display. Optimization driven by contribution margin.

02

Catalog & Listings

Catalog & Listings

Product detail pages, variation architecture, flat file management, and listing health. Catalogs that rank, convert, and don't randomly suppress themselves on a Tuesday.

Product detail pages, variation architecture, flat files, and listing health that actually stays healthy.

03

Conversion Optimization

Conversion Optimization

Structured A/B testing across titles, images, A+ Content, and Brand Store. We use data to decide what changes. Not gut feel. Not whatever the last agency thought looked nice.

A/B testing across titles, images, A+ Content, and Brand Store. Data-driven, not gut-driven.

04

Account Strategy

Account Strategy

Growth planning, pricing, promotional calendars, launch sequencing, and marketplace expansion, both US to EU and EU to US. One senior contact who actually knows your business.

Growth planning, pricing, promotions, launches, and US ↔ EU expansion. One senior contact.

05

Inventory & Supply Chain

Inventory & Supply Chain

FBA replenishment planning, restock limits, storage fee optimization, and inbound shipment coordination. We keep your inventory healthy so you never lose rank to a stockout.

FBA replenishment, restock limits, storage fees, and inbound coordination. No stockouts.

06

Case Management

Case Management

Seller Support escalations, listing reinstatements, reimbursement claims, and account health monitoring. The tedious, high-stakes work that most agencies quietly ignore.

Escalations, reinstatements, reimbursements, and account health. The work others ignore.

A real partnership.
Not a retainer.

Three things that make working with Leaven different. Not as a pitch. As a structure.

01 / Alignment

We win
when you win

Our fees are tied to your contribution margin, a direct measure of profitability, not just revenue. When we recommend a price change, a promotion, or a shift in ad spend, it's because the numbers support it. Not to justify an invoice.

CM-share model
02 / Relationship

High-touch,
high-trust

We work with a small number of brands and stay close to all of them. You'll feel that we're there and that we care. Not because it's in the contract. Because your growth is directly tied to ours.

Built on relationships
03 / Access

Referral
only

We don't take on anyone. Every client comes through someone we already trust. The fit has to work: personally, commercially, and for our capacity.

By introduction only

Does this sound like you?

We're not for everyone, and we're not trying to be. We work with a small number of brands, by referral only. Most of our clients were introduced by someone already working with us.

Leaven /

ˈlɛv.ən

rhymes with "seven". Bread as a parable for business and life

Leaven is the agent that makes dough rise. Invisible, patient, and entirely unimpressive to look at until the moment it transforms everything around it. You can't rush it, you can't fake it, and without it everything stays flat.

That's the business we're building. The kind of agency you measure by the margin growth, not the pitch deck.

Good things take knowledge, care, and time. We're not interested in growth that looks good in a monthly report and falls apart six months later. We want the kind that sticks.

Leaven croissant logo

The croissant standard. Hundreds of alternating layers of dough and butter, built through repetition, precision, and patience. No shortcuts, nothing rushed. Unmistakable, and impossible to fake.

Built by someone who reads the P&L before the pitch deck.

I'm Steven Bakker, founder of Leaven. Dutch by origin, a decade in the US, with a finance degree and a career that wound through boutique agencies, corporate brand strategy, and a unicorn e-commerce start-up. Bakker means "baker" in Dutch, and yes, I ran a microbakery out of my home in California for years. The name isn't just a metaphor.

Most Amazon agencies are built by marketers. Leaven is built around the economics first. The marketing follows. You work directly with me throughout. No handoffs, no rotating account managers.

SB

Steven Bakker

Founder, Leaven Marketing

Finance degree 2009

Netherlands. Reading businesses through the numbers first

Boutique agency 2016

California. Small teams, deep client relationships, real accountability

Corporate marketing 2018

Washington. Brand strategy, positioning, and execution at scale

Unicorn e-commerce start-up 2021

California. Where speed matters and there's nowhere to hide from results

Founded Leaven 2023

California. Bringing it all together, finally doing it the right way

Let's talk.

Referral only. If someone you trust suggested we speak, we're already listening.

steven@leavenmarketing.com

We respond personally. Usually within two business days, often sooner.