Apr 2023 – Present · 3 yrs 1 mo

• Migrated the AWS EC2 instances from AWS IMDSv1 to IMDSv2, strengthening metadata access security and mitigate SSRF vulnerabilities, aligning with AWS best practices and hardening cloud infrastructure.
• Migrated a high-traffic central BFF service from Spring Boot 2 to 3, hardening system security and ensuring seamless interoperability across dependent services, where failure could directly impact end-user transactions and business continuity.
• Developed a per-user API rate limiter leveraging Aerospike for low-latency request tracking, efficiently throttling excessive traffic and protecting backend services from abuse.
• Designed and developed a scalable auto-payment solution for prepaid services, onboarding 50M+ mandates annually by leveraging Kafka to asynchronously handle high-throughput payment events, retries, and decoupled downstream processing.
• Developed a Named Entity Recognition (NER) model in Python using spaCy and ChatGPT-assisted coding, achieving over 80% improvement in SMS parsing accuracy compared to legacy regex methods.
• Collaborated with cross-functional teams to design and develop a scalable, real-time platform fee calculation system handling high TPS, leveraging Elasticsearch as a dynamic rule engine to apply business- and user-specific logic resulting in INR 10M annual revenue growth.

Aug 2021 – Mar 2023 · 1 yr 7 mos

• Built a fault-tolerant backend service to deliver real-time, user-specific prepaid plans by integrating operator APIs with short-term caching, circuit breakers, and static plan fallback, ensuring high availability and seamless user experience during external API failures.
• Built a real-time detection service to identify mobile number details - operator, circle, and pay type - in real time, using Cassandra for fast lookups and dynamic fallback to live detection when data was missing or outdated —improving accuracy and reducing friction in recharge and billing flows.
• Developed a real-time notification system to inform enterprise merchants of bill payment events, leveraging Kafka for reliable stream consumption and ensuring timely, business-critical communication.

Sep 2018 – Jul 2021 · 2 yrs 10 mos

• Contributed to a high-throughput backend service responsible for serving pre-transaction metadata (e.g., plans, biller info) essential for enabling recharges and bill payments.
• Developed and optimized Rest APIs for core features like ranking, search, and filtering, directly impacting user experience and revenue-generating workflows.
• Implemented fallback caching mechanism to serve requests from Aerospike when Elasticsearch failed, improving service reliability under partial outages.
• Engineered a monitoring script to detect data discrepancies between MySQL and Elasticsearch in an eventually consistent setup, triggering real-time alerts for out-of-sync records to maintain data integrity.
• Built authenticated bulk and single-record CRUD APIs for the admin portal, ensuring only authorized access to critical metadata and safeguarding user experience from unintended data changes.