Customer.io Certified Partner

All the expertise of a senior email marketing hire. None of the overhead.

You know you need someone owning your email marketing. Someone who gets Customer.io inside and out. Someone who can build the strategy, execute the campaigns, and actually move the numbers.

But hiring a full-time head of email marketing? That's a £80k–£120k commitment before you've even factored in benefits, tools, and training. And finding someone who genuinely knows Customer.io at an expert level? Good luck.

There's a smarter way.

Book a free consultation →Or send us a message.

What is a Fractional Email Marketing Manager?

A fractional email marketing manager is a senior-level specialist who embeds into your team on a part-time or retained basis. You get the strategic thinking, the hands-on execution, and the deep platform expertise—without the full-time salary.

Think of it as having a seasoned head of email marketing on your team, just without the overhead.

At NerveCentral, our fractional engagements are built specifically around Customer.io.

That means you're not getting a generalist who dabbles in a dozen platforms. You're getting a certified Customer.io partner who knows every feature, every workaround, and every best practice—because it's all we do.

Who is this for?

This service is built for businesses that:

If any of that sounds familiar, we should talk.

What you get

Strategic ownership

We don't just press buttons. We take ownership of your email marketing strategy—setting goals, identifying opportunities, and building a roadmap that ties directly to revenue.

Campaign execution

From welcome sequences and onboarding flows to win-back campaigns and promotional broadcasts—we plan, build, test, and launch everything inside Customer.io.

Automation that actually works

Customer.io's automation capabilities are incredibly powerful. Most businesses use about 10% of them. We'll build behaviour-driven workflows that respond to what your customers actually do—not what you hope they'll do.

Ongoing optimisation

We're not the type to set it and forget it. Every campaign gets measured, analysed, and improved. Subject lines, send times, segmentation, personalisation—we're constantly testing and refining.

Reporting you can act on

No vanity metrics. No 47-page decks that nobody reads. You'll get clear, regular reports that show what's working, what's not, and what we're doing about it.

Data and segmentation

56% of marketing teams struggle with reporting and attribution. We'll clean up your data, build meaningful segments, and make sure Customer.io has everything it needs to deliver the right message to the right person.

How it works

1. We start with a conversation You tell us about your business, your customers, and what you're trying to achieve. No pitch decks, no pressure.

2. We audit your current setup We dig into your Customer.io account and assess what's working, what's broken, and where the quick wins are.

3. We agree on a plan Based on the audit, we'll propose a clear scope of work with priorities, deliverables, and timelines. You'll know exactly what you're getting.

4. We embed into your team We join your Slack, attend your standups (if you want us to), and operate as a seamless extension of your marketing team.

5. We execute and optimise—continuously Every month, we're building, testing, measuring, and improving. You'll always know what's happening and why.

Why NerveCentral?

We're Customer.io specialists

We don't spread ourselves thin across fifteen platforms. Customer.io is our thing—and because we focus solely on it, we know the platform inside and out. That expertise is what gets you better results, faster.

We're a certified Customer.io partner

We're not just experienced users—we're officially certified. That means direct access to Customer.io's team, early access to new features, and a depth of knowledge you won't find elsewhere.

We've done this before

From SaaS startups to established brands like Barclaycard, GSK, and BT—we've helped businesses across industries get serious results from their email marketing. Open rates of 55–70%. Click-through rates up to 20%. Revenue increases of 10x and beyond.

We actually care

This isn't a factory. We're a small, focused team that gives every client the attention they deserve. When you work with us, you're speaking directly with senior people who know your account—not being passed down to a junior.

Nice things people have said about us ...

Stop Searching. Hire NerveCentral.

Our company needed a strategic partner to help us build out our Customer.io profile, campaigns, and segmentation. We have been impressed with David and NerveCentral's ability to digest the information we throw at them, keep everything organized, and drive implementation and progress. We would recommend NerveCentral to anyone who needs a trusted and strategic partner to get up and running with Customer.io.

Everett Wolf
CEU Matrix

NerveCentral did a fantastic job in building out my email automation, perfectly worded emails triggered at the right time in the customers' journey. We have seen open rates between 55-70% with click-through rates of up to 20% which are astonishing figures.

George Taylor
Frive

Expertise in Customer.io

NerveCentral's help in migrating emails out of our internal system and into Customer.io has been invaluable. Their advice and guidance on best practices for event data was very helpful to our engineering team. Additionally, their knowledge about Customer.io specifically has been crucial as we were setting up all our email flows. NerveCentral is a pleasure to work with and we highly recommend their services!

Pooja Pradhan
AIRE Health

Excellent work from the team at NerveCentral

David is very professional and good at what he does. I'd recommend him for setting up email sequences for Customer.io. His delivery was on schedule, and all feedback provided was taken on board and incorporated.

Tayo Ademolu
Translayte

Just wanted to say thank you for your help and output during Black Friday week. I appreciated your independence, alacrity, efficiency, and overall executional excellence. Looking forward to our continued collaboration!

Robert Brotherton
Plus Body by Julia Haart

Dynamic and Adaptable to our Moving Goal

We came to NerveCentral with a brief that ended up changing many times on short notice - David was flexible and experienced in dealing with all the moving parts and helping us focus in on what was needed. Great communication through loom videos and managing our different timezones. Really grateful for his guidance in getting everything set up and rolling with everything we threw at him!

Kevin Rassool
High Impact Athletes

This is my second time hiring NerveCentral, the first being for an email drip campaign. Both times, they have delivered top-notch work in a collaborative environment. They established clear expectations for our work together and make the process of requesting revisions very easy. Will definitely be hiring NerveCentral again as my business grows!

Jared Judge
Dream City Music

Marketing Campaigns Made Easy by NerveCentral

It's been a pleasure working with David. David's knowledge of Customer.io has been invaluable to us at AIRE and his ability and willingness to keep up with the dynamic nature of a startup is highly appreciated.

Aastha Sharma
AIRE Health

Great Experience

We've had a great experience with David and look forward to working with him in the future. He has delivered all tasks as asked at a very professional level. It is really nice working with him because he has both technical expertise in customer.io and a marketing mindset.

MacGregor Lennarz
Gyna

NerveCentral did an exceptional job on our drip campaign. Not only did they write amazing copy, they also implemented the mechanics of the drip campaign for us. I would recommend NerveCentral to anyone looking to set up an automated marketing lead strategy/campaign.

Tem Balanco
BuildYourSite

NerveCentral's genuine care for our success has been refreshing

We're grateful for the support we've received from NerveCentral in setting up our Customer.io account and our first workflow—they made the entire process incredibly smooth and manageable. What's more, their advice on best practices has been extremely valuable. Their professionalism, knowledge, and genuine care for our success has been refreshing. We highly recommend their services.

Greg Pfister
KaiRise

CIO Expert setup

NerveCentral supported us in setting up our emails through Customer.IO and made the process smooth and hassle-free.

Adnan Riaz
AIRE Health

I worked with NerveCentral using email and specific landing pages for user acquisition. NerveCentral was extremely creative and suggested strategies that ran contrary to norms in the design of emails, the amount of information conveyed and the time and day the message was sent. They understood the degree of explanation required to create trust and tested iterations across multiple times and days. As a result of their work, we created a mix of long and short-form emails sent at different times to optimize open and click-through rates. I appreciate their help and continued insight.

Tony Maull
Save Big Bread

David exhibits a very deep and clear understanding of Customer.io

David was very competitively priced, asked all the right questions, was very clear in his communications and completed the requested tasks very skillfully.

Charles Vamadeva
Media Marketing Consultants LLC

The folks at NerveCentral are incredibly intelligent and can handle some of the most complex marketing automation requirements. We hired them to come up with a blueprint for our automation requirements and they fulfilled without a hiccup.

Jeev Trika
Crowd Reviews

David was easy to work with. He communicated proactively regarding progress, and he recorded a video on how to adjust the campaign if needed. He was also responsive to our questions about the email campaign after the project was finished.

Alyona Waltl
Software Defined Automation

Working with NerveCentral on our email campaigns was a real pleasure. It was a relief to hand over the reigns to them, as we just weren’t getting around to creating any emails ourselves due to lack of time. And I’m glad we did, because they did a far better job of it than we could have. The additional revenue they’ve generated for us is over 10x our investment—we couldn’t be more pleased.

Artem K
Slimfy

Frequently asked questions

How many hours per week/month will you dedicate to us? That depends on your needs. Our fractional engagements are flexible—some clients need 10 hours a week, others need 20+ hours a month. We'll scope it properly during our initial consultation.

How is this different from hiring an agency? An agency typically works on projects with clear start and end dates. A fractional manager operates as part of your team on an ongoing basis—attending meetings, owning the roadmap, and being accountable for results over time.

Do you only work with Customer.io? Yes. We're specialists, not generalists. Customer.io is our sole focus, and that's exactly what makes us so effective with it.

Can we scale up or down? Absolutely. As your needs evolve, so can our engagement. Need more hours during a product launch? No problem. Want to scale back during quieter months? That works too.

What's the minimum commitment? We typically recommend a minimum of three months to allow enough time to audit, implement, and start seeing results. But we'll discuss what makes sense for your situation.

Ready to get a senior email marketing leader—without the full-time cost?

David Crowther
Book a free consultation →

On our call, you'll be speaking with David Crowther, founder of NerveCentral.

Our initial consultation is not a sales call—you talk, we'll listen—then we'll come back to you within 48 hours with our best ideas on how to grow your business.