# Ronnie Dumesh

> Senior Software Engineer at Klaviyo

Location: New York, New York, United States
Profile: https://flows.cv/ronniedumesh

I am a Senior Software Engineer at Klaviyo based in New York City. Most of my work is ensuring the scalability and stability of our Campaign sending pipeline, which regularly sends over a billion emails a day, double on Black Friday.

## Work Experience
### Senior Software Engineer @ Klaviyo
Jan 2025 – Present | New York, NY

### Software Engineer II @ Klaviyo
Jan 2022 – Jan 2025 | Boston, Massachusetts, United States
-Factored out campaign recipient generation in sending pipeline to allow for independent scaling, multiprocessing, task impotency, and giving users the ability to generate up to 15,000,000 recipients at send-time for campaigns scheduled in the future.
-Created internal querying service abstraction to reduce downstream modifications and exceptions, allowing us to move out of the mono-repo while preserving availability.
-Used Amazon Database Migration Service to consolidate campaign channels (email, SMS, and push) to allow for multiple-channel Campaigns and reduce the number of database calls by a 67% from end-users looking to see overviews.
-Migrated a-sync task processing from RabbitMQ to a Pulsar-based internal tool, dogfooding it
-Used AWS CLI and Blue/Green deployments to partially automate engineering-wide MySQL 5.7 -> MySQL 8.0
-Assisted onboarding of new team members by helping develop new documentation to reduce tribal knowledge.
-Helped recruiting efforts at Cornell and led technical interviews for 100+ SWE candidates-

### Software Engineer I @ Klaviyo
Jan 2021 – Jan 2022 | Boston, Massachusetts, United States
- Used Redis, React, TypeScript, and Django's ORM to create a banner displaying a cached value of how users compare in open rates and click rates to other users in their market category.
- Identified and mitigated bottlenecks and hardware limitations in the sending pipeline to allow us to prepare for Black Friday traffic, which typically was double the previous year's traffic.
- Split out fields on campaign model to reduce model bloat and helped direct transition of over 1,000 unit and integration tests that need to be transitioned from old deprecated model

### Software Engineer Co-Op @ Klaviyo
Jan 2020 – Jan 2021 | Boston, Massachusetts, United States
- Worked with team product manager and large customers to define and create new public API endpoints to allow the retrieving email open and (link) click rates in a secure and RESTful way
- Redeveloped the email quarantine algorithm to reduce the number of private email addresses incorrectly not receiving emails by approximately 80%.

### INFO2950: Introduction to Data Science TA @ Cornell University
Jan 2020 – Jan 2020 | Ithaca, New York
-Held weekly office hours, led discussion sections on material learned in class that week, and graded assignments and exams.

### Software Developer @ Cornell CMSX
Jan 2019 – Jan 2020 | Ithaca, New York Area
•	Gained practical full-stack software engineering experience in creating a REST API backend using Java and ReactJS, working on a team, understanding others' code, and making my own code understandable to others, and updating legacy code systems. 
•	Overseeing rollout of new version of website’s student-side section, used by over 8000 Cornell students for submission of assignments.

### Research Assistant @ Memorial Sloan Kettering Cancer Center
Jan 2019 – Jan 2019 | Greater New York City Area
Computer Cell Imaging: Developed programs to better visualize microscopy slides used in cancer research
-Trained machine learning algorithms to better predict images that underwent Gaussian blur 
-Developed program to create more accurate 3D models of combined text files of existing 3D images


## Education
### Bachelor of Science - BS in Information Science/Studies
Cornell University

### High School Diploma
Staten Island Tech High School


## Contact & Social
- LinkedIn: https://linkedin.com/in/ronniedumesh

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Source: https://flows.cv/ronniedumesh
JSON Resume: https://flows.cv/ronniedumesh/resume.json
Last updated: 2026-03-30