Sayan Kar

I am a software engineer. I have experience building several dApps with solidity and ink! for smart contracts, ReactJs for the front end, and etherjs and polkadotjs for integrations. I also have experience building robust microservices-based backend architecture with Spring Boot Java.

Projects

Funcsion

Enabling functionalities to be cross chainSolidity, React, material ui, Polygon (Matic), Hyperlane, Push Protocol, moonbeam

ArCred

An Advanced on-chain CREDIT SCORE system for the multi-chain ecosystemSolidity, React, Defi, Rust, WASM, ccip

Skills

Java

Solidity

Rust

JavaScript

Node.js

React.js

Experience

Byju's Learning App - Software Engineer
July 2022 - Present
- Realized significant annual savings of 60 crore through successfully replacing both Zendesk and Salesforce with an in-house solution.
- Developed and sustained a dedicated search service, delivering rapid and precise search results at an average rate of 300 QPM.
- Incorporated advanced features such as filtering, sorting, and free-text search support in the search service, increasing search efficiency by 30%.
- Implemented a Kafka pipeline for asynchronous and reliable communication between services, ensuring exactly-once delivery semantics for a scale of 150K events daily.
- Leveraged Kafka connectors to seamlessly integrate and enhance the efficiency of data flow between disparate components.
- Engineered and implemented a rule engine processing 200K daily Kafka events, driving automation and efficiency.
- Led Low-Level Design (LLD) efforts for the optimal system architecture of the rule engine, contributing to a 50% workload reduction.
- Played a key role in implementing scheduler service, overseeing scheduled job execution and triggering SLA breaches, significantly improving the ticket resolution time.
- I conducted PoCs for Elasticsearch and Kafka, demonstrating their feasibility and potential benefits.
LLD | Spring Boot | Java | Elasticsearch | Microservices | Mongo | MySql | Apache Kafka | MVELRule | HLD | Kafka Connectors | JUnit | Mockito
Figment - Blockchain Contributor
May 2021 - January 2022
• Contributed tutorials to make decentralized applications on avalanche and
polkadot and explained several concepts related to blockchain.
• Links :- Build an AMM on Polkadot using Ink! , Create a Crowdfunding
plateform , Automated Market Maker on Avalanche , Chat dApp
Toppr - Software Engineer Intern
May 2021 - July 2021
- Developed an intuitive UI for searching and filtering across multiple entities, resulting in a 90% reduction in user search time. Introduced several other features in Toppr SchoolOs.
- Collaborated with the backend, product, and other teams to make the user-facing product.
ReactJs | Javascript | Redux | HTML | CSS | Saga