Klaviyo Developer · Email Engineer · Software Engineer
Most Klaviyo experts are marketers. They can set up flows, write emails, and read dashboards. What they cannot do is open a code editor, write a custom Klaviyo event via the JavaScript SDK, fix broken data architecture between Shopify and Klaviyo, build a cross-inbox HTML email that renders correctly in Outlook 2016 and Apple Mail simultaneously, or enforce DMARC at the policy level and understand what the aggregate reports are actually telling you.
I can do all of it. I am a full-stack software engineer with 13+ years of engineering experience, four Klaviyo certifications (Practitioner, Developer, Deliverability, and Strategist), hands-on Shopify development experience, and certified expertise in email authentication infrastructure. I do not need a developer to execute a marketer's idea. I am the engineer and the marketer in one engagement.
When a brand's Klaviyo flows are not firing correctly, the marketer files a support ticket. When Shopify is not passing the right event data to Klaviyo, the marketer waits for a developer. When DMARC reports show authentication failures, the marketer does not know what they are looking at.
These are not edge cases. They are the exact points where email revenue stalls, and where most agencies and freelancers have to stop and refer the work out.
I do not refer it out.
I build custom Klaviyo integrations using Klaviyo's APIs and JavaScript SDK. I can instrument custom events from your Shopify theme, process and transform your customer data, and get the right information into Klaviyo profiles so your flows trigger on accurate behavioral signals, not missing or malformed data.
I code HTML emails that render correctly across email clients: Gmail, Outlook 2016 to 2021, Apple Mail, mobile clients. I understand the constraints of email rendering: table-based layouts, inline CSS, image blocking, dark mode handling, MSO conditional comments for Outlook. I build around them. This is a different skill from web development, and most web developers do not know it.
I go beyond checking whether SPF, DKIM, and DMARC records are green. I understand what each record is doing, how alignment works between your sending domain and your From header, how to read DMARC aggregate reports to identify what is failing and from where, how to move from p=none to p=reject without breaking legitimate sending, and how to detect whether your domain is actively being spoofed.
Three distinct service areas, each with concrete technical scope. Not a generic menu. Click through for the full detail on what is involved.
Custom Klaviyo API integrations, JavaScript SDK events, account audits, Shopify theme instrumentation, and end-to-end setup, without handoffs between a marketer and a developer.
Read full detail →Cross-client HTML email development for Klaviyo, plus deliverability diagnosis and SPF, DKIM, and DMARC repair when emails land in spam or authentication is failing.
Read full detail →Full-stack software engineering with React, Next.js, and Node.js. 13+ years building production web applications, Shopify theme development, and the backend systems that power ecommerce integrations.
Read full detail →These are not decorative. Each Klaviyo certification maps to a distinct technical domain.
Platform functionality, flow configuration, segmentation, campaign strategy, and Klaviyo product operations.
Klaviyo's underlying data model, the Track and Identify APIs, custom event architecture, and building integrations with Klaviyo programmatically. This is the certification that distinguishes a developer from a marketer who uses Klaviyo.
Email deliverability mechanics, sender reputation, how inbox providers evaluate sending behavior, and how to diagnose and repair deliverability problems within Klaviyo.
Owned channel strategy, lifecycle marketing frameworks, and how to structure a Klaviyo program for long-term revenue impact.
Deep expertise in SPF, DKIM, and DMARC. Not configuration checkboxes, but how each protocol works at the technical level, how they interact, how to read authentication failure reports, and how to enforce domain protection against spoofing.
Certifications verify knowledge. What they cannot verify is the ability to execute. If you want to see specific technical work, get in touch and I can walk through relevant examples relevant to your situation.
Not every potential client is the right client for my specific skill set. Being clear about this saves both sides time and signals confidence.
If your situation fits what is described above, the most useful next step is a short conversation. Describe what you are working on and what is broken or missing, and I will tell you honestly whether I can help and what that would look like.