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Flexsin Technology - Software Engineer - Blockchain Technologies

Flexsin
UP
7 - 9 Years

Posted on: 06/12/2025

Job Description

Description :

We are looking for a skilled Blockchain Developer with hands-on experience in Solana (Rust + Anchor) and EVM-compatible chains (Ethereum, Polygon, Base, BSC).

The ideal candidate should have expertise in smart contract development, cross-chain interoperability, and full-stack dApp development with React and Web3 integrations.

You will work on building secure, scalable, and user-centric decentralized applications with seamless wallet and blockchain integrations.

Immediate joiners preferred.

Responsibilities :

- Develop and deploy smart contracts on Solana (Rust + Anchor) and EVM-based networks using Solidity.

- Build full-stack dApps with React.js/Next.js, Web3.js/Ethers.js, and wallet integrations (MetaMask, Phantom, WalletConnect).

- Implement cross-chain features using LayerZero, Wormhole, or Axelar (bridging, syncing, wrapped tokens).

- Write secure, gas-optimized contracts and perform thorough testing (Mocha, Jest, Anchor test suite, Hardhat, Foundry).

- Integrate backend services with Node.js, GraphQL/REST APIs, PostgreSQL/MongoDB, and Redis (optional).

- Automate deployments using Docker and CI tools (GitHub Actions, GitLab CI).

- Monitor and troubleshoot on-chain activity using tools like Tenderly, Etherscan APIs, and Solana Explorer.

- Collaborate with frontend and DevOps teams to ensure great UI/UX and scalable infrastructure.

Required Skills & Experience :

- 3+ years of full-stack development experience.

- 1+ year of hands-on Solana smart contract development (Rust + Anchor).

- Proficiency in Solidity and EVM tools (Hardhat, Foundry, Truffle).

- Strong knowledge of Web3 wallet integration, blockchain architecture, and RPC interactions.

- Experience with DeFi, NFTs, DAOs, and decentralized storage (IPFS, Arweave).

- Familiarity with authentication protocols like JWT, OAuth2, and SIWE (Sign-In With Ethereum/Solana).

- Understanding of smart contract vulnerabilities and Web3 security best practices.

- Experience with zk-rollups (zk-SNARKs, zkSync, StarkNet).

- Exposure to other chains like Cosmos, NEAR, or React Native/mobile dApps.

- Contributions to open-source blockchain projects.

- Knowledge of MEV, gas fee estimation, and bridging mechanics across chains


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