Apr 2025 – Present · 11 mos

Apr 2023 – Mar 2025 · 1 yr 11 mos

• Designed and developed highly scalable and configurable Event Gateway service from scratch and deployed to AWS and migrated traffic to this new service.
• Developed these services to handle traffic of more than 15000 TPS from multiple verticals of paytm.
• Data gathered by this service is used to flag potential fraudulent transactions and fraudulent users.
• Data attributes can be customised in DIY manner with a lot of flexibility.
• Worked on migration strategies to migrate traffic from legacy system to new system without a glitch.

Mar 2022 – Apr 2023 · 1 yr 1 mo

• Responsibilities :
• ➤ Part of Risk team which works dedicatedly in developing apps to handle & prevent frauds/risk in the Paytm transactions flowing through different systems.
• ➤ Developed an event-driven compute app on AWS Lambda (PaaS) for a backend service by using CloudWatch events as eventBridge. The Lambda function publishes this fresh data daily to the backend service via pub-sub model so as to use it efficiently in our apps/business logic.
• ➤ Implemented Pub-Sub solutions on top of Kafka & Redis for asynchronous service-to-service communication, Publish/Notify mechanism to all the pods so as to keep consistency across systems.
• ➤ Implemented a distributed, thread-safe caching mechanism for the service using Google Guava Cache. Used JPA to update this cache automatically once the service comes up, thus improving the overall system performance.
• ➤ Developed solutions to decide, split & move x% of application traffic (different versions of app) to different clients concurrently .
• ➤ Developed services on top of Executor service, Completable future to enable asynchronous behaviour & parallel processing, thus reducing the latency of different external api calls happening in the system.
• ➤ Developed & exposed different application metrics using Prometheus to keep the track of App traffic, transaction acceptance, different P95 & P99 latency, failures(5xx,4xx) etc. Also worked closely with TechOps teams to develop Grafana dashboards using these metrics as part of application monitoring & business point of view.
• ➤ Working on migration for different applications from legacy systems to AWS.
• ➤ Also actively participating as an Interviewer for the hiring drives happening here in Paytm.