Need Better Klaviyo Flows?
We’ll research, write, design, and build them for you.
See The Flow ServiceEmail Should Help You Get Customers. Not Just “Retain” Them.
We build email systems that increase first-order conversion and make your paid traffic more profitable.
Email Engineers · Klaviyo growth system
Want Us To Run Email For You?
We handle the strategy and execution from start to finish.
Book A Strategy CallTrusted by over 52+ Brands:
“Out of all the agencies I've worked with, they're the only ones that have exceeded my expectations.”
AustinFounder, Peak Saunas“The first drafts were already 10 times better than anything our previous agency had ever done for us.”
StephenHead of Marketing, The Flatpack Co.“Email Engineers added around 10% to our revenue through campaigns alone—roughly a 12× return.”
CalebFounder, STXND“My experience has been nothing but positive. The results have been great, and I don't have to hold their hand.”
DougCOO, Veto Pro Pac“The emails have generated millions of dollars. It's hands-off for me, so I can focus on running the team.”
LouisFounder, Eight-Figure eCommerce Brand“Email went from under 5% of our revenue to roughly 35–40%, with over $500,000 generated through campaigns and flows.”
David RoseCMO, Prolube OilWe research what makes your customers buy, then turn those insights into the campaigns, flows, pop-ups, and tests inside Klaviyo that move more subscribers toward a first purchase—and more customers toward the next one.
Our team handles strategy, copy, design, implementation, and ongoing optimization.
Matias “Matt” Perelli
Founder
Education
- Industrial Engineer.
- M.Sc. in Management Science.
- Bachelor's thesis on material optimization in manufacturing.
Experience
- Founded Email Engineers and bootstrapped it into a leading email marketing agency.
- 2x Keynote speaker at Ad World Prime.
- Worked with 52+ eCommerce brands, 90% of them based in the United States.
Verified Klaviyo Results
Here’s What Happened After We Took Over Their Email
Result: Grew Email From Under 5% to 35–40% of Revenue
David Rose
“We were at less than 5% email contribution to revenue... now it’s upwards of 35% to 40%.
We had taken a stab at it ourselves and had some people internally work on the flows and get things set up. There was a baseline.
I think we just needed to take that next step and find somebody who really understood it deeply.
After interviewing several people, we were pretty confident that you were going to be able to take it on.
And it’s worked out.
We’re far more consistent with the campaigns. We’re constantly building out new flows and evolving the flows that are working and not working. The ones that we don’t see working, we’re optimizing.
The quality of the work is great. I think those are the two key components that I look for.
So I definitely would recommend you guys.”
Result: Email Revenue Grew 3.5×
Stephen
“Overall, I believe we’re at either 37% or 38% in revenue attributed to Klaviyo. And I genuinely feel as though we’re just getting started.
The other metric we’re laser-focused on is revenue per recipient. We’re a super high-AOV brand — our average order value is a little over $1,000.
We’ve seen our revenue per recipient go up. When you look at the detailed view in Klaviyo, it’s quite a bit higher — almost double right now — compared with the average in our industry.”
“The first drafts we got back were, I think, less than 36 hours after we signed up. We hadn’t even had our official onboarding call yet.
Those were already ten times better than anything the previous agency had ever done for us. They were also better than anything we had written.
We’re rolling out this new brand messaging, and we hadn’t quite figured out how to put it into words. You guys helped us break through that wall right away.
They understood the assignment.
They actually read the onboarding docs that I sent. We were so impressed.
You guys learn. That’s the key.
The next email is better. And the next email is better...
So I can see that I’m investing in something that will grow over time if we both keep working at it.”
Result: Nearly 5× the Pre-Agency Email Revenue
Kevin
Verified ReviewA year ago, email was doing fine for us, making up 19% of our total revenue. Not bad, but I knew there was more on the table. Our at-the-time agency had been stuck for months. That’s when we reached out to Matias and his team.
Fast forward a year, and email is now responsible for 31 to 36% of our total revenue. Even better, we didn’t run more discounts or sales. Instead, Matias’ team completely changed the way we approach email. Every send had a purpose and every campaign was built to convert.
They took the time to truly understand our audience and what makes them buy. I think that made all the difference. As a result, email became a consistent and predictable revenue stream. Open rates jumped from 25% to 64% as well.
I’ve worked with agencies before. Most overpromise and underdeliver. These guys did the opposite. Hiring them was the best decision we made this year.
Result: “They’re someone you want on your side and not your competition’s”
Ryan
Verified ReviewBefore working with Matias and his team we were having trouble with weekly campaigns. Coming up with fresh (and profitable) ideas week after week is hard. That’s why we decided to search for experts in the field.
We decided to move forward with Email Engineers and we’re glad we did. We saw results the same week they started creating and sending out emails. Cooperation was easy. I was afraid this would suck up our time but they have a great process to make everything run as smooth as possible.
Email copy is on-brand and the designs are superb. They’re someone you want on your side and not your competition’s. Work with Email Engineers, you won’t regret it.
Result: Email Revenue Nearly Quadrupled
Doug
Klaviyo-attributed revenue grew from $806K before Email Engineers to $3.10M in 2025, while email’s share rose from 15.9% to 34.9%.
“We saw the potential of Klaviyo, but we realized that it was a fairly complex platform where you could do a lot more with it than we were capable of doing.
We all wear a lot of hats in this company. We don’t have somebody with that particular skill set, and the learning curve and the time involved would not have the ROI that we would want.
I think working with your team has really helped us because your expertise was evident from the beginning.
The time you spent to learn about our business was helpful because it saved me the time from having to explain that to you.
And then your ability to present that in a way that really portrayed our brand accurately was extremely helpful.
My experience has been nothing but positive. The results have been great.
And for somebody who’s very busy like I am, to not have to hold your hand the entire time is extremely valuable to me.
And to get the results that we’ve gotten is fantastic.
So yes, of course, I would highly recommend Email Engineers.”
Result: $10.4M in Email Revenue Since 2024
Austin
Email revenue nearly doubled in 2025, and 2026 is running 65% ahead of the same period last year.
“The benchmark that all of the eCommerce gurus were saying was that email should be 30% of your revenue.
And I was like, ‘Whoa. Mine is basically none.'
So that means I can add 30% to my business if I just implement email.
Long story short, hiring the professionals here, I think basically the first or second month that they came on board, it was somewhere around 23%.
So okay, we're moving in the right direction.
And I think now, over the last 30 days, it's like 48%. Which is a home run.
What they do is not just, ‘Okay, I've created one email with this copy and this design, and I'm going to put it out there.’
It's way more complex than that.
It's like engineering. The name actually makes a lot of sense.
Basically, they're testing a bunch of different variations with copy and designs. It's super intricate.
Out of all the agencies that I've worked with, they're the only ones that have exceeded my expectations.
It's one that I trust, that I'm not having to think about or manage at all.
I literally open the link that they send me once a week or twice a week to see what's upcoming.
And I'm continually blown away, thinking:
‘Wow, I could not do this myself to this level.’”
Result: Added ~10% to Total Revenue Through Campaigns Alone
Caleb
“Matias and his team — you guys — all of your campaigns have pretty much crushed it.
I believe you guys added a complete 10% of our revenue with email campaigns. It’s kind of a no-brainer for me to just have them with me now.
I didn’t want to feel like, ‘Okay, this is still going to be 50% of the work of just doing it myself.’ That was the main thing scaring me from working with an email agency.
You guys keep things super clear and simple. I feel like you guys keep the accountability very clear on who needs to do what and when for things to flow.
That part was a huge relief for me. I don’t feel like I need to be an octopus man. It feels like you guys are responsible for the entire email section.
Before, it was kind of this thing I had to do on the side. But now I confidently feel like it’s an added stream of revenue that we’re considering when we’re forecasting...
“It really — and I’m not just saying this — feels like Matias and his team are literal partners… The optimization and expertise really show, and they really take care of their clients.”
”
Result: ~20× Return From Klaviyo Flows
Elliott
“I can tell you that about 42% of our overall website revenue is coming from email campaigns...
We knew that we were leaving some opportunity on the table with our current Klaviyo setup.
So we found Matias and Email Engineers, and he certainly helped us optimize, think of new content, and really bring expertise to building out flows.
That includes the user experience of customers who go through those flows, how to best reach them, how to best connect with them, the timing, the setup.
It’s all those things.
It really takes an expert like Matias and the team to set these up the way they should be in order to maximize your ROI from email marketing.
They’re responsive. They’re smart. They know what to do to get the job done.”
Result: “The emails have generated millions of dollars”
Louis
“Our structure was mainly front-end focused.
We had flows set up, but no real consistent campaigns because I prefer the company structure to be more front-end focused — just gathering new customers.
Structuring an email team was not something I was familiar with, so I was looking for a competent agency to take that over.
Now all of our flows are optimized.
Emails are converting better.
And, of course, we have consistent campaigns now.
Those have generated millions of dollars ever since we started working with Email Engineers.
You guys are great to work with.
It’s pretty much hands-off for me, so it allows me to focus on running the team and on what we’re really good at, which is all the other parts of the business.
So it’s pretty much hands-off and a limited amount of work to get a lot of added benefit.
It’s a great partnership.”
Result: $615,000+ in Sales From Email Alone
Drew
Verified ReviewWorking with Matias and his team was a game-changer for our brand. Over the course of our partnership, we’ve generated over $615,000 in sales from email alone through Klaviyo.
Even though we’re in a super niche space, his team totally nailed the messaging—our emails didn’t just look good, they resonated and converted.
Honestly, I didn’t even think people checked emails this much anymore, lol, but apparently Matias made ours addictive.They took the time to understand our audience, and it showed in the results.
Highly recommend Email Engineers if you’re serious about growing your email channel beyond sales and flash offers here and there.
For eCommerce Brands:
Turn More of the Demand You Already Create Into Customers.
Schedule a strategy call and we’ll show you where the biggest opportunities are in your Klaviyo account, what we’d change, and how we’d use email to convert more of your existing traffic into revenue.
52+ BusinessesSuccessfully Served
Frequently Asked Questions
We manage the email marketing system behind your eCommerce brand.
That includes strategy, campaign planning, copywriting, design, Klaviyo implementation, flows, segmentation, testing, and ongoing optimization.
But our primary goal is simple: turn more of the demand your brand already creates into customers and revenue.
Most email marketing is organized around retaining and monetizing customers who have already purchased.
We think that leaves a much larger opportunity underused.
Your website usually has far more visitors and subscribers who haven’t purchased than customers who have.
So while we still build post-purchase, cross-sell, and retention systems, much of our work is focused upstream: capturing more of your traffic and building enough trust, desire, and conviction to turn more of those people into first-time customers.
We start by figuring out why people buy—and why others don’t.
That means studying your customer reviews, support conversations, ads, competitors, past email performance, customer language, and other sources of research.
Then we use those insights to improve the messages, offers, campaigns, flows, and lead-capture experiences your customers see.
We don’t believe the difficult part of email marketing is simply sending more emails. It’s figuring out what your customer needs to see, understand, and believe before they’re ready to buy.
Our goal is to make email as hands-off as possible for your team.
We handle the strategy, copy, design, campaign production, flow development, and ongoing optimization inside Klaviyo.
Your team provides the business context, approvals, and information we need to make good decisions. We handle the execution.
No. Acquisition is our priority, not our only objective.
Once someone becomes a customer, we still use email to increase repeat purchases, cross-sell relevant products, and strengthen the customer relationship.
We simply believe retention works much better when there is a healthy stream of new customers entering the business in the first place.
We begin by understanding the business before trying to change it.
We review your existing Klaviyo account, campaigns, flows, customer data, offers, products, and messaging to identify the largest opportunities.
From there, we prioritize the changes we believe can have the greatest impact rather than changing things simply for the sake of changing them.
We’re best suited for established eCommerce brands that already have meaningful traffic and demand, but believe more of that demand could be converted through email. This normally happens at over $200k per month.
The more traffic, customers, reviews, and existing marketing data you have, the more information we have to work with.
If you’re still trying to determine whether people want the product at all, we’re probably too early.
Our engagements are customized around the scope of work and what your brand actually needs.
The easiest way to determine fit, scope, and pricing is on a strategy call.
We’ll look at where the largest opportunities are in your current email program and explain what we would recommend doing about them.
That depends on your traffic, existing Klaviyo setup, offer, product, and the opportunities already present in the account.
We don’t believe in promising a predetermined result before understanding the business.
What we can show you are the results we’ve generated across more than 52 eCommerce brands—including many of the case studies and verified client reviews on this page – and how our average client stays with us for 16 months.
We’ll talk through your current email program, where you believe the biggest opportunities are, and what you’re trying to accomplish.
If we believe we can help, we’ll explain what we would do, how the engagement would work, and what it would cost.
If there’s a fit, we’ll discuss next steps.