Sayan Kar

I am a Software Engineer at AvaLabs. 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, and NestJs.

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

WhatsApp Wallet

Embedded crypto wallet on WhatsAppNode.js, Whatsapp API, okto, GraphAPI, CloudAPI

MemeCoinGen

Interact with the Polkadot ecosystem using WhatsApp AI chatbotSolidity, JavaScript, Rust, Redis, OpenAi, Nodejs, ink!, AI Agent, PolkadotJs, Dedot

Skills

Java

Solidity

Rust

JavaScript

Node.js

React.js

Experience

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
Byju's Learning App - Software Engineer
July 2022 - November 2023
- 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
regie.ai - Software Engineer
December 2023 - July 2024
Ava Labs - Software Engineer
July 2024 - Present