Nahush Kumta

Software Development Engineer

07.2021 - Current

Migrated signature algorithm used for signing a cookie (to detect cookie tampering) from weaker RSA-512 (1dy security) to ECDSA-p256 (30yrs).
Wrote spark job to backfill 180 million records into a table with missing data. This was done to be compliant with Apple tracking framework and it reduced a potential $300MM revenue risk to $18MM.
Conducted FIDO 2.0 (passwordless login) proof of concept for LinkedIn which was presented to the CEO. Am also part of the team that designed and implemented the changes. This feature is currently ramped to 10% of the global users.
Wrote a samza job for sending emails to customers on the event of their phone taken over scenario. Done as part of whatsapp notifcations charter and had an expected increase in weekly active user count of 0.32% in India.
Reduced time to live (ttl) of a browser cookie from 2yrs to 1yr to achieve GDPR compliance for cookie ttl <= 13 months. This was done in a rolling window fashion, where the cookie would be refreshed every 7 days with a new a new expiration that is 2 years from the time of refreshing, effectively achieving infinte ttl.
Migrated plugins from proxy servers hosted using Apache Traffic server (ATS) to HAproxy. This was done to increase maintainability and ease the development on those plugins.
Wrote a python library for parsing and signature verification of member identity cookie. It is used by all python services at LinkedIn.
Wrote a tool for recovering compromised accounts by reverting the handles owned by the account to a particular point in time. This tool is being used by member safety and recovery team at Linkedin to resolve a volume of 2 lakh compromised cases, hence reducing a lot of manual effort.

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