# Yash Tulsiani > Senior Software Engineer 2 at HubSpot Location: Boston, Massachusetts, United States Profile: https://flows.cv/yashtulsiani I am a backend engineer who likes hard problems: large scale distributed systems, high traffic services, and messy data that has to be made reliable and fast. Right now I work on HubSpot’s core CRM relationships platform, one of the company’s most critical backends. Our services handle tens of billions of requests per day while keeping p99 latency under 100 ms, backed by some of the largest storage clusters in the company. My work includes designing and shipping large scale migrations of relationship metadata to dynamic schemas, building asynchronous write and quota enforcement pipelines on top of wide column datastores, and creating internal tooling that gives engineers real time visibility into rate limiting and performance. A big part of my role is making sure new product bets can safely build on shared CRM data without breaking reliability guarantees. Previously, I was the backend technical lead for HubSpot’s Imports and Exports area. I led a small team that owned how customers get data into and out of HubSpot at scale. Highlights there include proposing and delivering a pre import data validation feature that became one of the most used parts of the product and significantly improved data quality, architecting read only pipelines for sensitive records, designing the Public Export API, and solving performance bottlenecks in Kafka based pipelines and high throughput caches as the system grew. If you are messaging or emailing me, please include Bumblebee in your message so I know you've reviewed my profile (although, AI has also gotten good at doing this step too!) ## Work Experience ### Senior Software Engineer II, Critical Services @ HubSpot Jan 2025 – Present | Cambridge, Massachusetts, United States As an Engineer on HubSpot’s core CRM relationships system, I work on some of the company’s most critical backend services. Our stack handles more than 26 billion requests per day while maintaining sub‑100 ms p99 latency and read-your-writes guarantees. This is backed by some of the largest HBase data clusters and Kafka clusters at the company. I focus on reliability, large scale distributed systems, and making it easier for product teams to build on top of shared CRM data. Selected work: * Led a zero‑downtime migration of core CRM relationship metadata from hard‑coded enums to a centralized, dynamic schema service, coordinating changes across 100+ codebases and 1000+ usages. This cut time‑to‑production for new relationship types from weeks to minutes and removed an entire class of rollback and scalability issues. * Designed and shipped a new asynchronous write pipeline for high volume relationship updates on top of a wide‑column datastore. I worked around the lack of transactional secondary writes while preserving strict read‑your‑writes guarantees, and materially lowering pager noise for a tier‑1 service. * Independently conceived, designed, and built an internal rate‑limiting debugging tool as a side project, using front‑end skills I developed on my own. The tool gives engineers real‑time visibility into throttling and has significantly reduced inbound questions and time to debug production issues. * Act as a cross‑team technical lead for company‑wide bets, including an extensible app‑defined objects platform and a new work management experience used across multiple product areas. I own relationship modeling, permissions, and reliability contracts so new products can safely build on shared CRM data. * Serve as a go‑to engineer for deep reliability and incident work, consistently root‑causing long‑standing race conditions and performance issues in distributed systems, then driving fixes from design through rollout while raising the bar on architectural rigor. ### Senior Software Engineer I, Critical Services @ HubSpot Jan 2023 – Jan 2025 | Boston, Massachusetts, United States ### Technical Lead @ HubSpot Jan 2022 – Jan 2023 | Boston, Massachusetts, United States Backend Technical Lead for HubSpot’s Import and Export systems, leading a team of three engineers on high scale data ingestion and extraction. I owned technical direction, worked closely with product to shape the roadmap, and focused on reliability, scalability, and a great first-time data onboarding experience. Selected Work: * Proposed, prototyped, and led end-to-end delivery of pre-import data validation, initially built as a hackathon MVP to win leadership buy-in. The feature became one of the most used parts of the product, now validating roughly 20,000 imports per day, improving import accuracy by about 40%, earning an internal award, and helping customers start with clean CRM data. * Architected and implemented a cross-product read-only pipeline that guarantees immutability of closed deals, including a major overhaul of the permissions system for granular object-level access control, while keeping the shared object-read service within strict latency SLOs. * Designed and built invalid-enumeration remapping in the import flow so customers can map messy spreadsheet values to clean system values directly in the UI, without editing files by hand, significantly improving data quality at import time. * Designed and implemented the Public Export API, focusing on a clean, evolvable surface for users, load testing to set safe rate limits, and swimlaning heavy workloads so performance issues are isolated from other teams and from UI-driven exports. * Drove major reliability and performance improvements as volumes scaled, including rearchitecting a high-throughput cache to eliminate JVM out-of-memory issues and latency spikes, fixing a Kafka producer/consumer design that caused uneven partitioning and lock contention, and separating request schemas from storage schemas to avoid serialization breakage as the product evolved. I also documented our work on preventing serial processing in the import pipeline on the HubSpot engineering blog. ### Senior Software Engineer @ HubSpot Jan 2022 – Jan 2022 | Boston, Massachusetts, United States * Designed and built read-only pipeline stage based permissions. This was Hubspot's first granular permission. Previously permissions were closer to an all or nothing model, but with this feature users have different permissions based on an object being enrolled in some criteria. Implementing this feature involved me writing features for many different teams, including modifying our high volume object write services and designing this feature in a way that did not add latency in this write path that serves millions of requests per second at peak volume. I also had to ensure consistency in preventing these writes across the entire Hubspot platform. ### Software Engineer @ HubSpot Jan 2020 – Jan 2022 | Boston, Massachusetts, United States Backend Engineer working on CRM imports, exports, and notifications. Started on a team with me and just my tech lead (2 engineers). During that time I've helped with developing large customer facing features and improving the reliability and scalability of our systems. I've also helped mentor two engineers that joined the team since I started. I've worked on a few large cross-company features: * Backend implementation of Flexible Association support for CRM Imports: https://knowledge.hubspot.com/crm-setup/associations-enhancements-beta#import-to-set-company-associations-and-labels-in-bulk * Adding Custom Object support for all CRM Notifications, including migrating data stores off of SQL via MapReduce jobs for improving API/Kafka performance: https://knowledge.hubspot.com/crm-setup/use-custom-objects * Migrating our internal Export Framework to use an improved object searching system I've improved reliability of our systems while we scale: * Solved major source of failed import requests resulting in elevated 500s due to downstream APIs * Decreased API latency by improving overall performance of API via more asynchronous code * Increased throughput of Kafka workers by adding caching layers, splitting workers up, and asynchronous code ### Member Of Technical Staff II @ VMware Jan 2019 – Jan 2020 | San Francisco, California, United States Merged from Pivotal Software Environments App: * Developed on a Ruby on Rails application adding support for pooled Cloud Foundry on Kubernetes environments with test driven development and Kanban system Pivotal Web Services: * Developed application to Automate certificate rotations on the platform with test driven development in Ruby * Building CI/CD pipelines to automate zero downtime CVE upgrades to the platform * Migrated monitoring platform from Datadog to Wavefront while rethinking SLO/SLIs from first principles * Running alpha versions of Cloud Foundry at scale (over 1,000 Application Instances) for tighter feedback cycles and performance testing * Developing alpha development of Cloud Foundry on Kubernetes to check for performance issues ### Systems Engineering Intern @ Mailchimp Jan 2018 – Jan 2018 | Atlanta, Georgia * Worked on an internal data center management tool to support production applications * Migrated RPC system from Apache Thrift to gRPC and integrated it into a Django Python app ### Software Engineering Intern @ Pivotal Software, Inc. Jan 2018 – Jan 2018 | San Francisco, California * Part of VMware Release Integration: * Worked on a release integration system supporting open source Cloud Foundry (open source on GitHub) * Improved the reliability of Cloud Foundry's flakiest tests in Go * Created CI pipelines to improve the agility of component teams deploying on the platform ### Software Engineering Intern @ Ultimate Software Jan 2017 – Jan 2017 | Miami/Fort Lauderdale Area * Worked in a devops role for Platform as a Service team supporting Pivotal Cloud Foundry * Developed Python tooling along with CI/CD to automate such as SQL auto-recovery and backup on critical user data ### Software Engineering Intern @ The Home Depot Jan 2016 – Jan 2016 | Greater Atlanta Area * Worked in the development of a multi-tenant CMS system for homedepot.com and their subsidiaries blinds.com and homedecoratorscollection.com * Technologies used included Java on Spring, Javascript, and AngularJS. ### Founder @ PhD Founders Jan 2014 – Jan 2016 | Schaumburg, IL * Started a tutoring company to provide low cost tutoring to over 30 students ## Education ### Bachelor’s Degree in Computer Science Georgia Institute of Technology ### Schaumburg High School ## Contact & Social - LinkedIn: https://linkedin.com/in/ytulsiani - Portfolio: https://ytulsiani.com --- Source: https://flows.cv/yashtulsiani JSON Resume: https://flows.cv/yashtulsiani/resume.json Last updated: 2026-03-31