Calan Pereira
Software Engineer @ Arcana
Bengaluru
6+ years of work experience
Jul 20262 mosPresent
Bengaluru
Building high scale ETLs pipelines for portfolio analytics
Jan 20251 yr 6 mosJun 2026
Bengaluru
Designed and built the backend for a collections management service to recover payments from delinquent users;
implemented optimistic locking and developed a custom operator for configuration management.
• Designed and Developed K8’s custom operator from scratch to enable elastic search index and template, by writing a custom Kind and reconciling logic for it.
• Designed and develpoed credit card upgradation feature [eg. move from regalia to infinia]
• Designed and developed ETL for elastic search previously done via in-house tool, moved it to Kafka connect ,which now handles about 20k events per second ingestion capacity. [at most once delivery to at least once delivery]
• Implemented Pesimistic locking and saga pattern to solve an inconsistency issue [distributed transaction], to make it eventually consistent
• Optimised 2 legacy micro services that caused OOM’s due to memory leaks, the G1GC moved all objects to old generation rapidly due to memory leak due to a version incompatibility of protobuff used in our sidecars for logging.
Jan 20241 yrDec 2024
India
Managing a Whole Microservice end to end
* Fine tuned Fork Join Pool threads to achieve optimal multi threading processing
* Developed an Event driven system architecture and implemented it
* Implemented and integrated Elastic Search for searching account holders using any filters present in the nested json payload efficiently
* Integration of temporal framework for Bundle management (A service which calls many micro services such as card life cycle, customer life cyle , loan life cycle , cupons ...)
* Added functionalites for customer life cycle managment such as statuses wich is an even driven feature that marks the account holder bankrupt or deceased and much more
* Worked on optimizing the db queries to withstand huge loads
* Re wrote the service to modularize the code and write cleaner and shorted code with refactoring and re versioning api's
* Resloved many critical bugs on updating account holders and puclishing the events over khafka
* Migrating an Internal Framework with data to java springboot with end to end testing.
* On call support for incidents raised.
* Built api's that were used in down stream services via pub sub.
* Load testing the apis and reducing latency to withstand upto 20k hits per second.
* API documentation and swagger support for the team.
* Deployed featuers specific to zones.
* Query Optimization to reduce latency of migrated api's.
Jan 20203 yrs 6 mosJun 2023
Karnataka, India
* Trained several Juniors and peers to do competitive programing
* Lead 3 different teams and cleared ICPC regionals.
* Conducted Over 3 major coding events including authoring of the problems with over 2k participants live.
* Conducted 20+ iterations of coding contests
* Conducted sessions on competitve programming
Calan’s AI Stack
Education
Bachelor of Engineering - BE, Computer Science
Dayananda Sagar College of Engineering, BANGALORE
20194 yrs2023
Pre University College, Physics Chemistry Math Computer Science
St. Aloysius (Deemed to be University)
20172 yrs2019
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