# Sameer Kumar > I'm a curious builder. Previously founded [ShipBlink](https://shipblink.com/), acquired by EasyPost (YC S13 unicorn). Digital nomad. I've been working and slow-backpacking since late 2021. 30+ countries so far. ## Projects - [ShipBlink](https://shipblink.com/) (Acquired; Founder & Engineer): Shipping software for online merchants, from checkout rates to labels and tracking. Used by [The Woobles](https://thewoobles.com/) and the online stores of Postman and Vercel. Over 95% profit margin as a one-person company. Partnered and built integrations with Shopify, Amazon, BigCommerce, eBay and Walmart. Customer review: "Better than any other dimensional shipping solution on the Shopify App Store." (Adjectives Market, Shopify App Store review, https://apps.shopify.com/shipblink-easypost/reviews) Customer reviews: [Shopify](https://apps.shopify.com/shipblink-easypost/reviews) · [BigCommerce](https://www.bigcommerce.com/apps/shipblink-labels-and-checkout-rates-easypost/). 3,000+ merchants (7-figure revenue). ShipBlink ecommerce merchant base and company revenue. Merchant count includes merchants who are not currently active. - [LeanFintech (CASParser)](https://leanfintech.com/) (Active; Founder & Engineer): Investment data and onboarding APIs for Indian fintech: portfolio imports, investment-feed reconciliation, KYC and financial-registry verification. Profitable, self-serve and run by me. Customers include Scripbox, Dezerv and 360 ONE, and range from small businesses to Fortune India 500 companies. Customer-managed AUM: ₹7.17 lakh crore (US$75bn+). Assets managed by LeanFintech / CASParser customer firms. ## Current work - Product at EasyPost: I own product for emerging ecommerce businesses, from signup to day-to-day shipping. - [Open-source tools](https://sameerkumar.website/labs): Shipping API libraries, carrier status monitoring and tools for coding agents. ## About I enjoy building & selling software. Now exploring Physical AI. ### Where it started My first online business started in high school. A few listings for unused phones and games on eBay brought in pocket money. I kept going, built a watch dropshipping store and earned Top Rated Seller status. In college, I spent most of my time at internships or projects like [DownloadAnySong.com](https://www.appbrain.com/app/downloadanysong/com.shivam.enterprise.downloadanysong#ratinghistory) - it got a lot of traction from Facebook Groups and Pages, and the app reached #9 Trending in its Google Play Store category (until Google found out about it lol). ### Building businesses Before [ShipBlink](https://shipblink.com/), I spent two years building the backend at Return Rabbit, a returns and exchanges app used by Shopify merchants like [Honeylove](https://www.honeylove.com/). In 2020, I started [ShipBlink](https://shipblink.com/). Online stores used it to show live shipping rates at checkout, then print labels and track packages. I built it and ran it alone for three and a half years. More than 3,000 merchants used it, including [The Woobles](https://thewoobles.com/). [ShipBlink](https://shipblink.com/) was built on EasyPost's API. In February 2024, EasyPost acquired it. I still run [LeanFintech (CASParser)](https://leanfintech.com/), a profitable, self-serve business providing investment data and investor-onboarding APIs for Indian fintech and wealth platforms. ShipBlink reviews: [Shopify](https://apps.shopify.com/shipblink-easypost/reviews) · [BigCommerce](https://www.bigcommerce.com/apps/shipblink-labels-and-checkout-rates-easypost/). ### Today I joined EasyPost as a staff engineer through the acquisition, then moved into product management. I own product for emerging ecommerce businesses. ## Pages - [Home](https://sameerkumar.website/): projects and current work - [About](https://sameerkumar.website/about): origin, business-building and current role - [Work](https://sameerkumar.website/work): career history and the transition from staff engineering to product management - [Labs](https://sameerkumar.website/labs): open-source tools and projects - [Travel](https://sameerkumar.website/travel): 30+ countries, slow travel since late 2021 - [Writing](https://sameerkumar.website/writing): posts on Medium ## Work - [EasyPost](https://www.easypost.com/), Product Management (Apr 2026 – now). I own product for emerging ecommerce businesses. I still write production code. I build agent harnesses around product specs, system context, validation and feedback loops. - [EasyPost](https://www.easypost.com/), Staff Software Engineer / Architect (Feb 2024 – Apr 2026). Joined through the [ShipBlink](https://shipblink.com/) acquisition and continued running it inside EasyPost for another year. Worked independently across products within a 400+ person organization, in an entrepreneur-in-residence capacity. - [ShipBlink](https://shipblink.com/), Founder & Engineer (Sep 2020 – Feb 2024). Built and ran [ShipBlink](https://shipblink.com/) solo. Partnered and built integrations with 11 ecommerce platforms, including Shopify and Amazon. Acquired by EasyPost in February 2024. Customer reviews: [Shopify](https://apps.shopify.com/shipblink-easypost/reviews) · [BigCommerce](https://www.bigcommerce.com/apps/shipblink-labels-and-checkout-rates-easypost/). - [Sylva](https://www.withsylva.com/), Founding engineer (Sep 2021 – Feb 2024). I built the shared data and operations layer across a portfolio of online communities. I also built Miitra, an AI product that helps community managers create content from Slack activity and engagement data. - [DelightChat](https://www.delightchat.io/), First backend hire (Jan 2021 – Aug 2021). I owned the backend, working directly with the CTO to build a Shopify and WhatsApp CRM. The product is used by 1,000+ ecommerce brands. - [Return Rabbit](https://returnrabbit.com/), Software Engineer (Aug 2018 – Jul 2020). Third engineer at a returns and exchanges product for Shopify merchants, then called SupplyAI. I built the backend from scratch; the product grew from $0 to six-figure ARR in 14 months. Later acquired by ShipStation Global. ## Labs Experiments, side projects and college-era APIs: https://sameerkumar.website/labs - [shipzil](https://github.com/sameerkumar18/shipzil) (2026): One Python interface for Shippo, ShipStation and Easyship, using your own accounts and rates. [On PyPI.](https://pypi.org/project/shipzil/) - [Shipzil status](https://shipzil.com) (2026): A live status page for the USPS, FedEx and UPS APIs, cross-checked across four shipping platforms. Polls every five minutes. - [LeanFintech (CASParser) agent toolkit](https://github.com/CASParser/agent-toolkit) (2026): Integration skills, templates and API guides for portfolio data, KYC and investor onboarding. - [LeanFintech (CASParser) MCP server](https://casparser.in/ai-agents/) (2026): Agent-callable portfolio, KYC and registry-verification APIs, with SDK execution in Code Mode. ### Pre-AI, hand-written code Public APIs written in college. Featured by Harvard's CS50 and Columbia University. - [corporate-bs-generator-api](https://github.com/sameerkumar18/corporate-bs-generator-api) (2018): Corporate buzzword generator API - [aztro](https://github.com/sameerkumar18/aztro) (2017): Daily horoscope API - [geek-joke-api](https://github.com/sameerkumar18/geek-joke-api) (2017): Random geek jokes REST API ## Writing - [Getting webhook data into Snowflake with Fivetran and Hookdeck](https://medium.com/@sameer_kumar/ingesting-data-to-snowflake-using-fivetran-and-hookdeck-from-third-party-services-85904f587bf) (2023-05-06) - [Stripe Connect for Roll-up Funds](https://medium.com/@sameer_kumar/stripe-connect-for-roll-up-funds-1ae69bec94aa) (2023-01-02) - [Micro-SaaS Acquisition: Notes on Tech Due-Diligence](https://medium.com/@sameer_kumar/micro-saas-acquisition-notes-on-tech-due-diligence-48fd13c0265) (2022-05-12) - [Celery: Django Admin Action to Manually Retry Tasks](https://medium.com/@sameer_kumar/celery-django-admin-action-to-manually-retry-tasks-90b8013b0b8f) (2021-12-17) - [Stripe Migration: Moving Subscribers Between Accounts](https://medium.com/@sameer_kumar/stripe-migration-migrate-subscribers-from-one-stripe-account-to-another-a-short-guide-c48140564c62) (2021-09-26) - [Setting Up Papertrail and remote_syslog2 for Application Logs](https://medium.com/@sameer_kumar/how-to-setup-papertrail-remote-syslog2-for-application-logs-on-your-server-fb4469dac8b6) (2021-02-26) - [Airtable Pro Tip: Overcoming Scripting Limitations with Pipedream](https://medium.com/@sameer_kumar/airtable-pro-tip-overcoming-airtable-scripting-limitations-with-pipedream-f700320273b4) (2020-10-21) - [My Journey: The Sqrrl Way](https://medium.com/hackernoon/my-journey-the-sqrrl-way-67e725492f33) (2018-08-05) · HackerNoon - [aztro: The Astrology API](https://medium.com/@sameer_kumar/aztro-api-is-live-now-5731293f8b89) (2017-06-30) ## Contact - Email: sam [at] sameerkumar.website - [X](https://x.com/sameer_kumar018) - [GitHub](https://github.com/sameerkumar18) - [LinkedIn](https://www.linkedin.com/in/sameer-kumar18/) - [Medium](https://medium.com/@sameer_kumar) - [Nomads](https://nomads.com/@sameerkumar)