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Sean Kelly Email & Phone Number

Director of Engineering at Klaviyo
Location: Quincy, Massachusetts, United States 17 work roles 3 schools
1 work email found @klaviyo.com 2 phones found area 617 LinkedIn matched
✓ Verified August 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email · 2 phones

Work email s****@klaviyo.com
Direct phone (617) ***-****
LinkedIn Profile matched
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Current company
Role
Director of Engineering
Location
Quincy, Massachusetts, United States

Who is Sean Kelly? Overview

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Quick answer

Sean Kelly is listed as Director of Engineering at Klaviyo, based in Quincy, Massachusetts, United States. AeroLeads shows a work email signal at klaviyo.com, phone signal with area code 617, and a matched LinkedIn profile for Sean Kelly.

Sean Kelly previously worked as Senior Engineering Manager at Klaviyo and Health and well-being at Career Break. Sean Kelly holds Bcos, Computer Science from Wentworth Institute Of Technology.

Company email context

Email format at Klaviyo

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{first}.{last}@klaviyo.com
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AeroLeads found 1 current-domain work email signal for Sean Kelly. Compare company email patterns before reaching out.

Profile bio

About Sean Kelly

Passionate and compassionate engineering leader who believes in doing right by the people on his team, and ensuring engineering work aligns directly with customer need.I believe engineers aren't paid to write code - they're paid to solve problems.

Listed skills include Web Applications, Sql, Javascript, C#, and 41 others.

Current workplace

Sean Kelly's current company

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Klaviyo
Klaviyo
Director of Engineering
Website
AeroLeads page
17 roles

Sean Kelly work experience

A career timeline built from the work history available for this profile.

Director Of Engineering

Current

Boston, Massachusetts, Us

I am currently working as a Director of Engineering at Klaviyo

Aug 2024 - Present

Senior Engineering Manager

Boston, Massachusetts, Us

Mar 2022 - Aug 2024

Health And Well-Being

Career Break

Time off between roles to recharge and spend more time with my partner

Nov 2021 - Mar 2022

Chief Technology Officer

Distributed, Us

In my capacity as CTO, I performed the following duties for Allma:* Grew the engineering team from 2 to 9 engineers* Provided mentorship, guidance, and development opportunities for the engineering team at-large* Worked to establish baseline processes for the Engineering org itself* Help support the team through early access and public launch of the current product* Partnered with Customer Support to design the Engineering Support process for customer issues* Identified and provided plans for architectural and scalability concerns for the future of the platform* Lead initial architecture efforts for utilizing AWS Lambda, DynamoDB and Go for upcoming work

Apr 2021 - Nov 2021

Engineering Manager

In my time leading teams in the Pharmacy Manufacturer and PBM/Hub spaces, I worked directly with a team of engineers, providing guidance, mentorship, and prioritization of work.I paired with stakeholders across the business to help define and prioritize requirements in order to launch programs that brought free and reduced priced medicines into the hands of thousands of people who could not otherwise afford them.I lead several key technical initiatives in my time at PilllPack, directing the teams to build re-usable APIs for large scale partner integrations responsible for a projected 1/4 of the overall in yearly revenue target, as well as minor program expansions responsible for incremental yearly revenue as well.Additionally, I helped prioritize work to reduce oncall burden by an order of magnitude, reducing pages from a near constant stream to a few per day. Further, I lead the transfer of ownership of parts of the technical stack to other teams better equipped to own them, to help streamline and focus my team on executing their core mission.Finally, I helped provide a future-forward plan for structuring both the requirements process as well as the technical organization itself to allow the business to continue to scale in the years to come.

Sep 2020 - Apr 2021

Head Of Engineering, Soar Practice

Boston, Massachusetts, Us

In my time as HOE, I continued to focus on personal development and growth for my team, but transitioned into focusing on my more senior engineers and managers, delegating some of my prior responsibilities to allow those folks an opportunity to advance.My primary focus was on ensuring that our teams had the right culture to allow engineers to grow and improve, while still focusing on delivering meaningful work for the product and the business.I worked on managing our teams and individuals through two rounds of change management, one being our original formation into a practice and an aligning of engineering work, product goals, and customer outcomes for the business, and the second being a mid-year set of changes in response to the impacts on hiring and staffing that COVID-19 had on our teams.I was also responsible for helping to build and establish our reporting funnel for customer health and success, working with our internal BI teams as well as product and marketing to determine the right things to track, and worked with those folks and the engineers to understand how to track them, and ultimately built and maintained several reporting frameworks to assist in publishing these numbers to the business as we continued to evolve how we viewed our customers. This work extended to helping with team based KPIs, where i advised teams on how to think about achievable metrics that matter, and not just ones that look good on a chart.I was also routinely involved in customer facing problems, from hands-on debugging and security patches to critical pieces of our software, to sales and POC calls, to outreach about new features or capabilities in our software. Through my time at Rapid7 I worked closely with our engineers to help them grow and evolve not only as engineers, but as team members and collaborators, and am proud to say that I was able to help several engineers be recognized for promotions, and was able to mentor and promote ICs into management.

Dec 2019 - Aug 2020

Senior Engineering Manager

Boston, Massachusetts, Us

I continue to perform the roles described in my capacity as an engineering manager, but at the senior level i'm more involved in training up future managers and growing both the scope of our teams impact as well as interfacing more heavily with other business units to align priorities around upcoming work.

Mar 2019 - Dec 2019

Engineering Manager

Boston, Massachusetts, Us

I was moved into a Managerial position to help our team shift from our existing product to building the future product on the Rapid7 Platform.I was still actively involved in day to day engineering efforts, including:* Designing the architecture of our cloud offering* Vetting technical decisions* Helping to ship features* Providing overall technical leadership and guidanceAdditionally, I've focused on running the team from a managerial perspective, including:* Training up replacements for myself in the above bullet points so the team can better govern it's own design and decision making process. * Introducing dedicated 1-1s* Doubling the team size in a quarter* Aligning priorities across teams and departments* Preparing quarterly goals and objectivesIn this time, I also acted in a support capacity helping to maintain our old product with our existing customers, along side the engineers and a dedicated support team, including:* Providing product mentorship for new support staff* Participating in support calls for existing customers* Participating in sales calls for potential customers* Providing an overall roadmap and set of guidance for maintaining the existing product

Aug 2017 - Mar 2019

Lead Software Engineer

Boston, Massachusetts, Us

During the transition, I was briefly brought it in at the Lead Engineering level, but was quickly moved into a Managerial position to help align the existing engineering efforts with the upcoming efforts to put our product into the Rapid7 Platform.

Jul 2017 - Aug 2017

Principal Engineer (Founding)

Komand

I worked as a founding engineer at Komand, helping to deliver features while improving the scalability and performance of the platform as a whole.I built the capability to scale the platform horizontally in a modern infrastructure, as well as wrote the Go SDK, and worked on the Python SDK. In addition, I worked to establish strong development practices and architectural standards to help build a more maintainable platform as a whole.Additionally, I designed a microservice based approach to modernize the way the platform integrates with third-party services.

Aug 2016 - Jul 2017

Staff Engineer And General Technologist

San Francisco, California, Us

I worked as a Staff Engineer at Tapjoy on a number of projects, ranging from legacy to greenfield projects.I helped to update and improve the precision of the financial pipeline when dealing with micro amounts of money with no downtime to the business, as well as a large-scale migration of terabytes of financial data out of MySQL and into MemSQL.I made numerous improvements to the monitoring and alerting processes.I was one of the chief "problem solving" engineers, routinely jumping across team boundaries to help other teams / engineers solve production issues and design solutions (acting in my capacity as a "General Technologist").Additionally, while I was not actively on the operations team, routinely spent time working with the ops team to design solutions, improve existing systems, and diagnose / debug issues in production. I held the title of "honorary" operations engineer.I was also the foremost in-house expert in Go, and helped to introduce it as the next major language we we wrote new services and applications in, as well as ported older logic. Some of these projects resulted in significant savings to the companies bottom line.

Aug 2014 - Aug 2016

Senior Software Engineer

San Francisco, California, Us

I worked as a Senior Software Engineer at Tapjoy, on numerous projects focusing on subjects such as backend data storage and migrations, improving and managing our background jobs systems, large scale revisions and improvements to the code in the financial pipeline.Additionally, I gained experience developing on and managing linux based systems, administering an AWS environment, running and managing scrums, and proper sprint planning techniques.My work mainly focused on back and middle tier applications and services, including turning several legacy applications into a modern service-based architecture.

Dec 2012 - Aug 2014

Senior Software Engineer

Healthrageous, Inc.

I worked as a Senior Software Engineer for Healthrageous, helping to design and built their new platform while at the same time, maintaining and supporting the current product.I helped to define goals, design and implement new features, introduce improvements to existing ones, and lay the foundation for an entirely re-written platform.I performed work across the entire stack, from heavy database design and reporting work, to business logic and api integration, to front end javascript development.

Jan 2011 - Dec 2012

Head Of Development

Boston, Ma, Us

I worked briefly in the capacity of Head of Development during a transitional phase in the companies life cycle.During this time, I helped to redefine development goals, prioritize resources, and managed the Development Team. I was responsible for representing the Development side of the company in meetings, both on and off site, as well as managing relationships with offsite providers and partners, ensuring uninterrupted work while the company re-positioned itself.

Apr 2010 - Feb 2011

Software Engineer

Allston, Ma, Us

Worked on several client projects, including an Online Restaurant Ordering System, and a Web-Based File Management System.Was one of the main influences on the Conversion Action Platforms (the flagship product) overall direction and design, from Database to U/I.Designed, Created and Maintained Web Data Tracking, Lead Management / Collection, and Phone Number Purchasing / Management Systems, along with methods of exporting this data.Designed, Created and Maintained several Windows Services to process incoming data, and handle long running / asynchronous tasks.Additionally, developed a "Heart Beat" system for these Services, including an internal website to view the statuses.Responsible for authoring almost every SQL report used in the system, in addition to helping support and administer the Database as a whole.Developed tools and utilities to improve the efficiency of the development team. Among these, several methods of generating test data for the purposes of checking data integrity and system load stability.Was the chief software engineer in regard to investigating faulty or suspicious data, and was routinely tasked with solving "Mysteries" in the database, and the system as a whole.Partially responsible for maintaining and improving in-house CMS.

May 2007 - Mar 2010

Software Engineer

Virtify

Worked briefly on several small projects, including investigating the possibility of creating "HotSpots" on web-based PDFs served via the companys Web Application.

Jan 2007 - Apr 2007

Database Administrator

Webgen Systems

I was a Database Administrator, performed various operational support duties, helped train new employees, and also did development work on existing and new applications, as well as running and delivering reports on a daily / weekly basis

Aug 2004 - Nov 2006
Team & coworkers

Colleagues at Klaviyo

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3 education records

Sean Kelly education

Bcos, Computer Science

Wentworth Institute Of Technology

Education record

Ac

Education record

Arlington Catholic
FAQ

Frequently asked questions about Sean Kelly

Quick answers generated from the profile data available on this page.

What company does Sean Kelly work for?

Sean Kelly works for Klaviyo.

What is Sean Kelly's role at Klaviyo?

Sean Kelly is listed as Director of Engineering at Klaviyo.

What is Sean Kelly's email address?

AeroLeads has found 1 work email signal at @klaviyo.com for Sean Kelly at Klaviyo.

What is Sean Kelly's phone number?

AeroLeads has found 2 phone signal(s) with area code 617 for Sean Kelly at Klaviyo.

Where is Sean Kelly based?

Sean Kelly is based in Quincy, Massachusetts, United States while working with Klaviyo.

What companies has Sean Kelly worked for?

Sean Kelly has worked for Klaviyo, Career Break, Allma, Pillpack, and Rapid7.

Who are Sean Kelly's colleagues at Klaviyo?

Sean Kelly's colleagues at Klaviyo include Chris Choi, Tony Morelli, Kate O’Neill, Justina Easow, and Michael Stallings.

How can I contact Sean Kelly?

You can use AeroLeads to view verified contact signals for Sean Kelly at Klaviyo, including work email, phone, and LinkedIn data when available.

What schools did Sean Kelly attend?

Sean Kelly holds Bcos, Computer Science from Wentworth Institute Of Technology.

What skills is Sean Kelly known for?

Sean Kelly is listed with skills including Web Applications, Sql, Javascript, C#, Jquery, .Net, Databases, and Python.

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