Career
8+ years of building things that matter
From scaling distributed systems to unlocking hundreds of millions in GMV — a record of the work, the numbers, and the people along the way.
$700M+
GMV unlocked
80K
Concurrent users
30K+
QPS
540+
PR reviews in a year
150+
Interviews conducted
18
Internal awards
Experience
Jan 2026 — Jul 2026
Senior Software Engineer
- — Designing multi-tenant systems for CASB product, securing petabytes of enterprise data across cloud apps for 1000+ customers with strict isolation.
- — Working on high-throughput data pipelines (activity scan, inventory, retro-scan) processing 1B+ files/day with 99.999% availability and P99 latency under 2 minutes.
Jun 2023 — Jan 2026
Software Development Engineer 3
- — Re-architected CRM message relayer to active-active multi-DC, serving 80K concurrent users.
- — Led CX backend for Flipkart Minutes hyperlocal launch in 3 months; unlocked $700M+ GMV.
- — Scaled backend APIs to 30K+ QPS for big sale events; improved throughput by 30%.
- — Reduced latency by 1s to unblock Flipkart for Biz launch, enabling $40M incremental GMV.
- — Re-architected Spark-based bulk incident system, cutting resolution from 15 min → 1 min for 20K incidents.
- — 540+ PR reviews;mentored 10+ engineers; conducted 44 interviews in 2025 alone.
- — Contributor to Apache Pulsar, Google Guice, and MVEL — first on team to contribute to upstream OSS.
Feb 2021 — Jun 2023
Software Development Engineer 2
- — Owned and scaled a high-throughput Transactional Communication Platform (3M+ Emails, SMS, PNs/day)
- — Achieved 93% higher throughput, 91% lower DB load, 77% lower CPU usage.
- — Re-architected for better maintainability and faster product iteration
- — Led integration of inbound telephony with skill-based routing — 90% improvement in connect rates.
- — Established deployment standards reducing on-call overhead; reviewed 230+ PRs.
Feb 2019 — Feb 2021
Software Development Engineer 1
- — Worked on backend systems powering Email, SMS, and Push Notifications for customer communications.
- — Delivered $3.5M annual savings via SMS optimizations.
- — Built a template variant generator helping achieve SMS compliance with TRAI DLT regulations.
2018
Earlier Roles
Furlenco — Software Engineer (Nov 2018 – Feb 2019)
Billing, invoicing, and refund microservices for monthly furniture rentals.
MoveInSync — SDE (Aug 2018 – Oct 2018)
Real-time monitoring systems using Kafka and Elasticsearch.
Amazon — SDE Intern (Jan 2018 – Jun 2018)
RESTful services for seller onboarding, verification, and identification.
Featured Work
CRM Real-Time Messaging Platform
Multi-DC · Fault-Tolerant · 2023–2026
Re-architected real-time CRM message relayer from a single-DC SPOF to active-active multi-DC. Chose Apache Pulsar with key-shared subscriptions for ordered, scalable processing. Built client-side ACK protocol guaranteeing at-least-once delivery.
80K
Peak concurrent agents
Active-Active
Multi-DC architecture
Flipkart Minutes
Hyperlocal Launch · 2023
Led CX backend systems for Flipkart's hyperlocal quick-commerce launch in under 3 months. Built real-time map rendering and ETA updates using a custom ETag-based polling approach to dynamically refresh pages without major architecture changes.
$700M+
GMV unlocked
3 months
Ship time
Transactional Comms Platform
3M+ msgs/day · 2021–2023
Owned and scaled the communication platform handling millions of emails, SMSes, and push notifications daily. Micro-optimized MySQL and Redis to dramatically reduce resource usage while re-engineering for maintainability.
93%
Higher throughput
91%
Lower DB load
77%
Lower CPU
Bulk Incident Resolution
Spark · Async Processing · 2024
Re-architected an offline Apache Spark processing system enabling bulk cancellations and returns for ops teams. Enabled async processing with a roadmap for future migrations.
15 → 1
Minutes to resolve 20K incidents
15×
Faster resolution
Open Source
Skills
Languages
Distributed Systems & Data Infrastructure
Cloud & Platform
Core
Leadership
Recognition & Community
Internal Awards
Across 7 years at Flipkart, recognizing technical excellence, mentorship, and high-impact delivery.
Engineers Mentored
Structured career and technical coaching; Guided full-time conversion of high-performing interns.
Girls Wanna Code 5.0
Mentored 3 students in Flipkart's flagship women-in-tech program with structured guidance.
What people say
What sets Santanu apart is his deep, foundational understanding of technology. In an era where AI tools are becoming ubiquitous, his in-depth technical knowledge—the kind that comes from truly understanding systems from first principles—is increasingly rare and invaluable. He doesn't just solve problems; he understands them at their core.
— Peer recommendation · Flipkart
I learned so much from him, not just in terms of technical skills, but also in how to approach problems thoughtfully, manage priorities, and lead with empathy and clarity. Any team would be lucky to have someone like Santanu, and I feel fortunate to have had the opportunity to work closely with him.
— Peer recommendation · Flipkart
As a Lead Developer, Santanu successfully executed multiple mission-critical initiatives that delivered significant value to the company. He has a rare combination of analytical sharpness, ownership, and calmness under pressure—qualities that made him the go-to person for complex challenges.
— Manager recommendation · Flipkart
Once the task is assigned to Santanu, you can just relax and work will be done for sure in quick fashion.
— Manager recommendation · Flipkart
Education
Bachelor of Technology, Computer Science & Engineering
Odisha University of Technology and Research
2014 – 2018
8.6
CGPA
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