Sulabh Mahajan - Staff Engineer at MongoDB

Sulabh Mahajan

Staff Engineer at MongoDB

Barcelona, Catalonia, Spain

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Summary

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Rockstar

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Top School

Sulabh Mahajan is a Staff Engineer based in Barcelona with 15+ years focused on data infrastructure and a decade of professional experience building core storage and database systems. He has progressed through multiple engineering roles at MongoDB where he contributed to the MongoDB server and the WiredTiger storage engine, shipping C/C++ and Python fixes that improved correctness, statistics, and robustness for production databases. Earlier work on SnapMirror at NetApp and privacy and protocol subsystems for Pidgin/GSoC projects shows a strong background in distributed replication, low-level systems, and cross-protocol interoperability. Sulabh combines deep internals expertise with practical operational sense—he’s comfortable changing storage schemas, tuning checkpoint and flush behavior, and hardening retry logic. Known for thoughtful, low-risk changes that prevent incorrect readouts and improve observability, he brings both hands-on coding and long-term reliability thinking to data platform teams.

9 years of coding experience

10 years of employment as a software developer

B.Tech, Electronics and Communication, B.Tech, Electronics and Communication at Dehradun Institute of Technology

Senior Secondary School, Senior Secondary School at Delhi Public School

English, Hindi, German

Stackoverflow

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Github Skills (23)

c-language10

checkpoint10

admin10

back-end-development10

nosql10

wiredtiger10

databases10

database-administration10

c1110

mongodb-database10

checkpointing10

c1710

cplus10

cpp10

cprogramming-language10

Programming languages (5)

C++CJavaScriptHTMLPython

Github contributions (5)

wiredtiger/wiredtiger

Sep 2016 - Jan 2023

WiredTiger's source tree

Role in this project:

Back-end Developer / Database Engineer

Contributions:608 reviews, 119 commits, 397 PRs in 6 years 5 months

Contributions summary:Sulabh primarily contributed to the WiredTiger database's back-end functionality, specifically focusing on altering schema app_metadata and improving conditions for reading from lookaside pages during checkpoints. The user made several code changes, modifying C and Python source files, which involved altering the underlying data structures and implementing the logic to prevent incorrect information from being presented. They also added new statistics and improved the logic around the handling of prepared transaction data.

rustwiredtiger

mongodb/mongo

Jun 2016 - Jan 2023

The MongoDB Database

Role in this project:

Back-end Developer / Database Engineer

Contributions:100 commits, 36 pushes in 6 years 8 months

Contributions summary:Sulabh primarily contributed to the MongoDB database project by modifying C++ code, JavaScript, and configuration files. Their work includes removing compatibility features for older database versions, adding information to the `collStats` output, and fixing assertions within the WiredTiger storage engine. The user also addressed retry mechanisms for size storer flushes and added WiredTiger configurations for fuzz testing.

nosqlc-plus-plusmongodb-databasedatabasemongodb

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