Sanjay Singh Muchhal

SANJAY SINGH MUCHHAL Senior Software Engineer PERSONAL DETAILS Website: github.com/sanjsingh07 EMPLOYMENT Senior Software Developer Nov 2025 - Present Freelance Working on a Dex to trade/swap crypto coins using ADA, built on top of changeNow and orderly Senior Software Engineer – Rust (LLM Evaluation & Repository Apr 2025 - Oct 2025 Validation) Turing, remote Performed detailed data labeling and annotation to improve supervised learning datasets for Anthropic's Claude AI model. Trained Anthropic's AI Model (Claude) on Rust Code, specifically on writing unit tests, integration tests, stress tests, etc. Senior Software Engineer Jul 2024 - Apr 2025 CrunchHoldings, Remote Built a Retrieval-Augmented Generation (RAG) system with Next.js and Node/Prisma, integrating vector databases and embeddings for semantic search, enabling modular multi-LLM support and significantly improving contextual accuracy and retrieval performance. Developed a low-latency, high-volume trading and bulk transaction bot on Solana using the Jupiter aggregator API, with automated ATA creation, secure wallet encryption, and optimized transaction batching to reduce slippage and maximize throughput. Senior Smart Contract Developer Apr 2024 - Jan 2025 DxSale Developed and deployed high-performance Rust-based smart contracts on Solana, including a Referral-based system, an SPL Token Minter, and a Locking/Vesting contract leveraging PDAs for enhanced security. Translated existing Solidity smart contracts into Solana Anchor Smart Contracts. Blockchain Architect Oct 2023 - May 2024 Blockgen Studio, United States · Remote Implemented an MPC Wallet Microservices using Shamir's secret sharing algorithm. Helped the dev-ops team set up the polygon-edge network (setting up validators and deploying bridge and validator smart contracts.) Worked on core components of polygon-edge, like adding custom checkpointing RPC endpoint for bridging purposes. Worked on XP Reward system for an American bank mainly creating a customized ERC20 SC as XP Token and customized ERC1155 as SoulBound Token and one regular ERC721 as regular NFT token. Senior Rust Developer unbox universe, Antwerp, Flemish Region, Belgium · Remote This resume is made with Jobseeker.com. Oct 2023 - Mar 2024 Worked on creating a token standard that can be only redeemed by/if the redemption properties match which are defined at the time of minting. Implemented entire messaging dispatcher service that reads from Kafka topic and dispatcher message to the end user via various available services like Email, SMS, and Web Socket(that is connected to the mobile app), and also supports classic polling to fetch undelivered from the database. Senior Developer Sep 2022 - Nov 2023 MSys Technologies, LLC, Pune, Maharashtra, India · Remote Created Upgradable Smart Contracts, NFTs(ERC1155, ERC721), Soul Bound Token and ERC20 Token. Built and set up production level Hyperledger Fabric channel, contract implementation, for the intercarrier settlement for Teleco organization. worked on Layer 1, Geth Client, protocol level, updated the native token minting mechanism to mint tokens based on total token staked on system staking contract, and deployed custom genesis smart contract on the genesis block. Built Ethereum-compatible Blockchain Networks using polygon edge/supernet for scalable Appchain solution Contributed to Solana hashing fn keccak, Blake3, and Sha256 and Solana Program Library written in Rust Associate Software Engineer Feb 2021 - Sep 2022 iMentus Technologies Pvt ltd., Indore Led a team of 4, to implement Cross Border Payment Wallet (B2B, C2C) on top of Stellar Foundation using Stellar Ecosystem Proposals. Implemented HMAC cryptography for cryptographic authentication that uses a hash function and a secret key to identify merchant users to verify the signature. Implemented crypto payment gateway using coinqvest to enable business to accept cryptocurrency as payments. Implemented and integrated Auth0 for user authentication and delegation signing for security purpose on Stellar Kelp. ACHIEVEMENTS OPEN-SOURCE PROJECT CONTRIBUTIONS: Contributed To Stellar's Kelp (AMM) (Golang): Contributed to an Open Source Project named Kelp which is an Automated Market Maker built on top of a stellar network, kelp is used by 100k+ people. https://github.com/stellar/kelp/pull/703 Contributed To Solana (Rust): re-written code for hashing fn in Solana for keccak, Blake3, and Sha256 to have generic and trait-based implementation. https://github.com/solana-labs/solana/pull/33128 Contributed To Solana Program Library (Rust): Contributed to Solana Owned Project for SPL Token Creation, https://github.com/solana-labs/solana-program-library/pull/4810 Contributed To How-to-Guide (Substrate Framework): Contributed to how to guide for dev of Substrate Repo, https://github.com/substrate-developer-hub/substrate-how-to- guides/pull/66 Contributed To Polygon Edge (AppChain Wiki) Updated outed cmds for Polygon Edge: https://github.com/0xPolygon/wiki/pull/113 This resume is made with Jobseeker.com. SKILLS Rust NodeJS/Typescipt Solidity Postgres Kafka Geth/Ethereum Solana Redis RAG Systems Go Gitflow/CICD AWS This resume is made with Jobseeker.com.