eCommerce
DTC apparel · Shopify
+184% revenue in 9 months
Digital marketing & AI consultancy
Lean marketing.
Real results.
Faster.
A senior-led, AI-native consultancy for ambitious brands. Seventeen years across paid media, content, SEO, CRM, branding and site migrations — delivered without the overhead of a traditional agency.
Est. 2008 — independent, senior-led
17+
Years senior experience
80+
Brands scaled
4.2×
Avg. ROAS uplift
0
Bloated retainers
Brands I've worked with
Paddy Power
Paddy Power
Paid media strategy and creative optimisation across acquisition campaigns, driving efficient CPA at scale.
- Lidl
Lidl
Retail media planning and always-on social content to support national FMCG campaigns.
Sky
Sky
Performance marketing and CRM lifecycle programmes for subscription growth and retention.
SSE
SSE
Digital transformation and paid acquisition to grow residential energy customers.
Quantcast
Quantcast
B2B demand generation, content strategy and ABM for enterprise ad-tech sales pipeline.
53 Degrees North
53 Degrees North
eCommerce paid media, SEO and CRO to grow outdoor retail revenue across Ireland.
Lily's ChildcareLily's Childcare
Local SEO, Google Business optimisation and brand messaging to fill enrolment waitlists.
Buckley Real Estate
Buckley Real Estate
Website migration, lead generation funnels and paid social for property listings.
- Cassidys Camden Street
Cassidys Camden Street
Hospitality branding, social content and events marketing for a Dublin landmark pub.
- Fussy Food Plates
Fussy Food Plates
DTC brand launch, Shopify build and paid social scaling for a food-tech startup.
Kerrigans
Kerrigans
Brand refresh, site rebuild and local paid media to grow neighbourhood footfall.
Shamrock Rovers
Shamrock Rovers
Fan acquisition campaigns, membership CRM and matchday content strategy.
Templeogue United
Templeogue United
Grassroots club brand, digital presence and sponsorship activation.
FAI
FAI
National governing body content, campaign strategy and audience growth.
Alfa Electrical
Alfa Electrical
Lead generation, local SEO and site migration for a growing electrical trades business.
Services
Full-spectrum,
senior-led.
One dedicated senior operator. Access to a lean bench of specialists when the work calls for it. No layers, no account management theatre.
- 01
Paid Media
Meta, Google, TikTok, LinkedIn. Full-funnel performance built around incremental revenue — not last-click theatre.
- 02
AI Transformation
Practical AI adoption for marketing teams. Workflow automation, content systems, agent tooling, and measurable productivity gains.
- 03
Content & Creative
Big campaigns and quick-turn assets. Editorial, video and social — high volume, on-brand, without the agency overhead.
- 04
SEO & Organic
Technical audits, content strategy, entity SEO and AI search readiness. Rankings that translate into pipeline.
- 05
CRM & Lifecycle
Email, SMS and journey design. Segmentation, automation and retention flows that turn CRM into a revenue engine.
- 06
Branding & Positioning
Brand strategy, naming, identity systems and go-to-market. Distinct positioning that compounds over time.
- 07
Site & Platform Migrations
Shopify, headless, WordPress, Squarespace, Webflow. Careful migrations that preserve SEO equity and improve conversion.
- 08
Measurement & Analytics
GA4, server-side tracking, MMM and attribution. Clear data, fast insights, decisions you can defend.
The lean model
We built this consultancy
to be different.
Over the past two decades I've watched marketing bloat. Too many layers. Too many buzzwords. Too many invoices with little to show for them.
Brands pour money into complex funnels, oversized teams and vanity metrics — while losing sight of what actually moves the needle.
Lean. Focused. Outcome-obsessed. Smart, efficient, full-spectrum support — from eCommerce and performance to content, design, AI and data. No hand-holding. No inflated retainers.
Senior only
The person you meet is the person doing the work.
AI-native
Modern tools embedded in every workflow, not bolted on.
Outcome-priced
Aligned to results — not hours, not headcount.
Selected work
Twenty years,
measured in outcomes.
B2B SaaS
Series B · Global
3.2× qualified pipeline
Marketplace
Migration · Headless
42% lift in organic sessions
Retail
AI transformation
60% content ops efficiency
Case studies available on request. Recent engagements span DTC apparel, global retail, B2B SaaS, marketplaces and venture-backed startups.
In their words
Barry cut through six months of noise in a week. Clear plan, senior thinking, and results we could actually measure.
The rare consultant who ships. He rebuilt our paid media, migrated the site, and left our team stronger than he found it.
Our AI adoption went from slide-deck to shipping in eight weeks. Practical, senior, no fluff.
About
Founded by Barry McCarthy.
Seventeen-plus years leading digital marketing across start-ups, scale-ups and international brands — from eCommerce and performance to brand, content and AI.
Lean Growth Marketing is the model I always wished clients could hire: senior thinking, direct access, and the operational range of an agency, without the layers that dilute the work.
Currently taking on a small number of new engagements.