About

Neeraj Kumar, SDE-I at Datachecks.

At Datachecks, I build backend systems for data migration validation. I work on FastAPI APIs, Celery workers, and connector behavior across enterprise database systems. I also contribute to datachecks/dcs-core, mainly on connector reliability, query handling, and release maintenance. Most of my work is performance tuning for 10M+ row workloads and shipping stable deployments in air-gapped environments. Before Datachecks, I worked as a Backend Developer Intern at 9AI.

PythonFastAPICeleryPostgreSQLRedisDocker

Current Datachecks production snapshot: 1,323 comparisons in 90 days, 1,143 successful jobs, 105 datasources, and 685,442,825 rows downloaded for migration validation.
Cut data comparison time by nearly 50% by switching from hash-based diffing to in-memory diffing, while eliminating repeated OOM failures on large tables.
Added per-column diff thresholds so jobs spend compute where it matters and cover more dataset surface.

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Start with Ryuk-me/Torrent-Api-py or datachecks/dcs-core if you want to review code and impact before the resume.

Experience

Experience timeline

Datachecks

SDE-I

Jun 2024 – Present · Remote · India

I work on Datachecks' core comparison product for migration validation: FastAPI control APIs, Celery workers, and deployment paths for enterprise environments.

Cut data comparison time by nearly 50% by switching from hash-based diffing to in-memory diffing, and removed repeated OOM failures on large tables.
Added per-column diff thresholds so compute focuses on meaningful variance and wider dataset coverage.
Expanded connector support across MSSQL, MySQL, Oracle, Databricks, Sybase IQ/ASE, Presto, and Trino.

FastAPI control planeCelery workersComparison engine tuningDatabase connector integrationsOffline enterprise deployment

Datachecks

SDE Intern

Dec 2023 – May 2024

Built customer-facing workflow APIs for Croma's WhatsApp bot, including installation and account flows.

Implemented Request Demo Installation flow for Croma WhatsApp users.
Built Demo Installation Status flow for installation tracking.

WhatsApp workflow APIsCustomer account integrationsCross-team dependency handlingBackend feature delivery

9AI

Backend Developer Intern

Oct 2023 – Nov 2023

Worked on realtime messaging and integration tooling at 9AI: Invotbot-API communication paths and Salla SDK development.

Implemented realtime messaging paths using Redis Pub/Sub.
Supported WebSocket communication flows for backend services.

WebSocket supportRedis Pub/SubMongoDB analyticsPython SDK design

Credentials

Education and full skill map

Master of Computer Applications (MCA) · Lovely Professional University

Full skills, project details, and role-by-role outcomes are in the resume and projects pages.

Full resume LinkedIn Case studies

Neeraj Kumar, SDE-I at Datachecks.

PythonFastAPICeleryPostgreSQLRedisDocker

Current Datachecks production snapshot: 1,323 comparisons in 90 days, 1,143 successful jobs, 105 datasources, and 685,442,825 rows downloaded for migration validation.

Cut data comparison time by nearly 50% by switching from hash-based diffing to in-memory diffing, while eliminating repeated OOM failures on large tables.

Added per-column diff thresholds so jobs spend compute where it matters and cover more dataset surface.

Start with Ryuk-me/Torrent-Api-py or datachecks/dcs-core if you want to review code and impact before the resume.