Citi★3.9 (21k)· London

Work with Solidity, Web3J/Web3JS/Ethers.js/Viem, Java/Spring, Node.js, and blockchains such as Ethereum, Hyperledger Besu, Canton, and Solana, using Hardhat/Foundry/Truffle for testing. Contribute to Citi's Integrated Digital Assets Platform (CIDAP) building Web3 components for tokenization, smart contracts, and on-chain settlement.

You will work with Solidity, React, Node.js, TypeScript, GraphQL, React Native or Flutter, and Ethereum or Binance Smart Chain. This consulting company builds web, mobile, and Web3 applications with blockchain integration.

You’ll work in Rust, C, or C++ on the Agave client’s block-production pipeline, designing shared-memory systems and optimizing scheduling, verification, and throughput for the Solana network at a Solana R&D lab.

You’ll work with Node.js, TypeScript, React, ethers.js, viem, Web3.js, Solana Web3.js, and CI/CD microservices. The FinApps Access team builds the backbone of on-chain access for financial institutions—designing systems that route, protect, and optimize transactions across dozens of EVM and non-EVM blockchain networks.

You'll develop and maintain the Agave client for the Solana blockchain using Rust or C++, focusing on performance optimization, security testing, and distributed systems reliability. Anza is an R&D lab building robust blockchain infrastructure and protocols to improve Solana's scalability and security. You'll analyze code, design benchmarking solutions, and collaborate across teams to enhance the network's robustness against emerging threats.