Worked with Fraud and Sanctions team at GoPay in payments domain.

• Lead projects for Gopay Savings integration with risk rule engine, and its integration with segmentation service to prevent promotion abuse, and had monthly savings of ~120M IDR.
• Headed rule engine performance activites by enabling lazy evaluation, optimizing GC, handrolling custom parser and parallel evaluation; which reduced time taken by parsing from ~1 second to ~250 ms, around ~75% faster.
• Piloted Kong level lua plugin for attestation to stop scripted attacks, which blocked around: 30K requests per week; 0.033% of all requests, i.e. ~4.5K per day.
• Authored various in-depth RCAs and RFCs, revolving around enrichment and risk context service for auto routing of customer complaint tickets.
• Participated in hiring, mentoring new hires in team by KT, TDD, pairing and reading sessions regarding functional programming, Clojure design patterns, benchmarking and performance tuning.

Tags: Load Testing | gRPC | Go | Elxir | Clojure | Redis | PostgreSQL | QuickCheck | Kafka | Lua | Kong | TDD

Worked with Logistics - Last Mile Scheduling and Platform team.

• Extracting components from monolithic webapp to microservice components, serverless Lambdas and Batch.
• Integrating external services with failure recovery mechanisms like cache, DLQ, and rate-limiting.
• Driven our webapp launch across multiple countries like UAE and India using our multi-tenant platform webapp.
• Worked on backend, frontend and legacy webapp ensuring operational and process excellence by driving adoption to new technologies like CDK, fixing vulnerabilities, and production issues.
• Maintaing dashboards, alerts, wikis for design documents, onboarding and having brown bag sessions on new technologies and gothchas

Tags: Java | AWS Lambda | CDK | DynamoDB | ECS | SQS | SNS

• Made a testing Framework using Purescript, which will parse logs from prod and run same commands in beta and compare output.
• Improved the logic of gateway decider for payment gateways using exponential backoff and other heuristics.

Tags: Functional Programming - Haskell & Purescript | Web Development | Database