ABHINAV ARORA

- Set up a new k8s infra involving - RabbitMQ, Redis, MongoDB, CronJobs, ElasticSearch, Nginx-Ingress - Migrated 30 TB MongoDB database from ScaleGrid to DigitalOcean ensuring zero data loss via manual scripts.

Optimising CronJob performance. Job duration down by 50% and Peak MongoDB CPU usage down from 95% to 70% - Replaced nats; with & rabbitMq; for communication between different components of application. - Built an RBAC layer to allow admin users to invite new members to team and assign them different roles/permissions. - Improved instrumentation and debugging which helped in solving pending bugs. - Optimised Redis query performance in a flow building account history. It solved pod crashes for large users.

- Implemented an FTS search using InnoDB MySql instance which improved search results for the tickers. - Brought up Grafana, ELK stack for monitoring & logging. Also responsible for daily maintenance & updates for the K8s cluster, EC2 machines, RDS instance. - Implemented rate limiting using nginx-ingress. Added health checks, PagerDuty, Pingdom alerts to critical APIs. - Developed API, cache system & Frontend component to fetch historical prices of tickers from the providers.

- Notification Service: Designed, Developed an event based asynchronous notification service handling millions of daily notifications via WhatsApp, Webhooks, SMS, Emails. Service had an uptime of 99.99%, a response time of less than 200ms at a scale of 3,000 RPS. It had configurable retry policies, separate queues for priority messages, feedback loops to auto-switch providers using delivery metrics for each notification type. - Architectured, led development of second factor authentication ecosystem within merchant login. It involved merchant/sub-merchant many to many relation. A merchant could mandate, control sub-merchant login settings. - Developed an internal tool for controlled rollout of features. It enabled developers & managers to confidently rollout features as release is controlled & rollback is instant. It could handle scale upto 100K RPS & 30 ms response time.

Automated the release of mobile SDKs. It decreased the time to release from a couple of hours to 10 minutes - Migrated the IOS sdk from Objective-C to Swift and simplified the integration for clients. - Developed a Plugin architecture for the Android SDKs using Reflection which decreased maintenance & improved 
integration. Worked on the Android UPI SDK which enabled users to register on UPI and perform transactions.