Kelvin Perez

Automation & Integration Developer

I build integrations, internal tools, and workflows around how a team actually works. I care about the systems behind the process and the interfaces, context, and feedback people need to use it.

Iowa, USA. Fully remote roles.

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Hey, how's it going? I'm Kelvin Perez. I'm a full stack and marketing tech developer, bringing nearly a decade of software engineering experience to marketing systems. My foundation is PHP and Laravel with ReactJS, TypeScript, WordPress, and Shopify.

I connect websites, applications, and the workflows behind them. In this portfolio, you could explore Light Code Labs, my lead capture and automation platform, and also Field Letter, a working HubSpot lifecycle system, covering consent, email nurture and sales handoffs. My AI automation projects cover lead response in Zapier support inbox triage review monitoring invoice processing and brand voice checks as a skill built for agents. I've also built with Shopify and Klaviyo a an entire customer journey from abandoned cart email sign up and coupons and the whole entire customer journey life cycle.

You could explore more on my marketing technology and AI automations link on my website. So these projects are a controlled demonstration because I couldn't show actual client work. And this way I could show the results and the limitations documented and the guardrails that I have implemented to make sure that the workflows aren't going out out of out of whack, or they're actually doing exactly what we want them to do. And the beauty about this is that you could actually inspect the workflows, the emails and the decisions behind the code and why I decided to go with this architecture.

I'm looking for a remote role in a marketing technology automation or software development role. If your team needs someone who could connect the systems has a great eye for design UI UX and I could build applications around anything that you know your heart desires any idea. You know, I do it all day for myself. I have little tools and internal apps and I love to talk, you know.

So the next thing you could do is you could go and you could go to the contact here and you could either copy my email. I made it, you know, anti-bot, you know, so you have to like copy it. You could also book a call with me a 20 minute conversation, 15 minute conversation. Totally fine.

This is my Cal.com calendar. And then you could also view my resume as well. All right, thank you so much for your time. Looking forward to hearing from you and my name is Kelvin Perez and I can't wait to talk.

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Explore my work Resume

Connected systems. Clear next steps.

Explore my work

Selected work

Field Letter: Speed to Lead

Automation & integrations

A controlled Zapier lead response workflow connecting HubSpot qualification and consent to scoped opportunities, Slack alerts and independently received Gmail acknowledgments.

Zapier
HubSpot
Gmail
Slack
TypeScript
PostgreSQL
Docker

Support inbox triage

Automation & integrations

A controlled support workflow that turns Gmail requests into HubSpot tickets, unsent reply drafts and urgent Slack alerts, with a person in control of sending.

n8n
Gmail
HubSpot
TypeScript
PostgreSQL
Slack

Light Code Labs

Laravel, React & TypeScript

A Laravel platform connecting lead capture, enrichment, CRM workflows, and automated follow-up.

Laravel
React
TypeScript
PostgreSQL
Docker

Invoice and receipt processor

Automation & integrations

I built a TypeScript document workflow that validates extracted fields, holds uncertain receipts for review and reconciles accounting writes before replay.

Trigger.dev
TypeScript
Apple Vision
Poppler
CSV

Review Monitor

Automation & integrations

Real reviews become traceable support tasks and recurring themes, with every public response kept under human control.

n8n
Node.js
PostgreSQL
HubSpot
Slack

Brand voice email checker

Automation & integrations

Catch off-brand email wording before approval, with clear fixes a marketing manager can review.

Reusable review skill
Brand profiles
HTML
Python

What I bring to your team.

Internal tools & integrations

Custom applications connecting clear interfaces with the APIs, data, and background workflows behind them.

Field Letter lifecycle system

Lead capture, consent, personalized email, native nurture, and a verified sales handoff in a developer test account.

Scalable content systems

Reusable templates and structured content that reduce repetitive website production work.

The toolkit behind the work.

PHP, Laravel, React, and WordPress form my development foundation. Building direct HubSpot and Klaviyo experience alongside that work.

Experience that carries forward.

Building for the web since: 2016
Years with PHP, Laravel & MySQL: 7+
Client websites supported at Perfect Afternoon: More than 50
Localized SunnySide service pages: 487+

Connected workflows you can inspect

Inspect Field Letter’s native lifecycle and n8n lead response extension, with durable recovery, controlled execution evidence and measured draft and Slack timing.

Marketing technology & CRM

Connected capture, consent, nurture and ecommerce journeys.

Field Letter lead capture landing page with its home service enquiry checklist

Field Letter: Customer Lifecycle System

A HubSpot developer-account implementation connecting tagged lead capture, consent, responsive email, native nurture, automatic sales handoff, native scoring, A/B testing and reporting. Inspect the controlled execution, reliability tests and actual email artifacts.

Explore

Morning Beam Coffee Shopify development storefront

Morning Beam Coffee: Ecommerce Lifecycle

A Shopify and Klaviyo customer journey connecting consent, checkout recovery, purchase context, and responsive email, verified with controlled test recipients.

Explore