Varun Upadhyay

Sunnyvale, California, United States

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Summary

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Rockstar

Varun Upadhyay is a Senior Backend Software Engineer with 10 years of experience building scalable distributed systems from Sunnyvale, California. At Atlassian he’s driving FedRAMP compliance for Confluence and simplified messaging by migrating microservices from Kafka to AWS SQS, reflecting a pragmatic approach to enterprise architecture. He previously tackled bottleneck and scale issues on Google’s Payments Platform and helped DoorDash move from a monolith to service-oriented payments APIs, working across JVM and Python stacks. An active open-source contributor to popular repos like TheAlgorithms and LeetCode solutions, he writes generic algorithm implementations with unit tests, highlighting strong algorithmic foundations and testability. Trained originally in electrical engineering and holding a master’s in software engineering, he blends low-level analytical rigor with cloud-native production engineering.

10 years of coding experience

Stackoverflow

Stats

160reputation

7kreached

13answers

10questions

Github Skills (24)

kotlin10

unit-testing10

algorithms10

lintcode10

data-structure10

java10

sorting-algorithm10

javas10

data-structures10

sorting-algorithms10

binary-search9

algorithm9

insertion-sort9

bubble-sort9

linear-search9

Programming languages (15)

JavaC++RustMakefileVueGoHTMLJupyter Notebook

Github contributions (5)

TheAlgorithms/Kotlin

Mar 2019 - Mar 2019

All Algorithms implemented in Kotlin

Role in this project:

Back-end Developer

Contributions:6 commits, 11 PRs, 12 pushes in 4 days

Contributions summary:Varun primarily contributed to implementing algorithms within the Kotlin programming language, as evidenced by the addition of linear search, binary search, bubble sort and insertion sort implementations. These contributions included the creation of new files, implementing the algorithms, and writing unit tests to verify their functionality. Furthermore, the user made the algorithm implementations generic. The changes also demonstrate an understanding of algorithm time and space complexity.

kotlin-languagekotlinjavadata-structuresalgorithms-implemented

TheAlgorithms/Java

Jun 2017 - Dec 2018

All Algorithms implemented in Java

Role in this project:

Back-end Developer

Contributions:82 commits, 120 PRs, 75 pushes in 1 year 5 months

Contributions summary:Varun primarily contributed to the repository by implementing various algorithms and data structures in Java. Their work included creating programs to remove duplicate characters from strings, convert between number bases, and implement tree traversals. They also refactored existing code to make it generic and added new algorithms such as Fibonacci sequence generation.

data-structuresjavasorting-algorithmssearchalgorithms-implemented

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