Blockchain Developer

Role

Build and maintain the multi-chain wallet, deposit, withdrawal and sweep infrastructure, including permissioned (ERC-3643) tokenized assets.

Responsibilities

Develop and maintain wallet services across EVM chains (Ethereum, BNB Chain, Polygon, Base), Bitcoin, Tron and Solana.

Implement address generation, deposit detection, sweeping, gas provisioning and withdrawal broadcasting.

Integrate node/infrastructure providers (Tatum, RPC endpoints) and handle webhook-driven transaction events.

Write and integrate smart contracts ERC-20 / BEP-20, ERC-3643 (T-REX) permissioned tokens, staking, token sale, plus tests and deployment scripts.

Implement ERC-3643 compliance flows: identity registry and ONCHAINID onboarding, claim issuers/topics, transfer-restriction and compliance modules, agent/owner roles, and forced-transfer/freeze/recovery operations.

Ensure idempotency and correctness on all money paths, no double-spends, no lost deposits.

Handle key management, signing flows and secure secret storage.

Debug on-chain issues: stuck transactions, nonce conflicts, failed receipts, reorgs, and rejected compliance transfers.

Required

3-4 years building production blockchain applications.

Strong Node.js/JavaScript; solid Express and MongoDB.

Hands-on with web3.js or ethers.js, plus at least one non-EVM chain (Bitcoin, Tron or Solana).

Solidity: can read, write and test contracts.

Working knowledge of token standards, ERC-20/721 and ERC-3643 permissioned/security tokens (identity, claims, transfer compliance).

Practical grasp of transaction lifecycle, gas, nonces, confirmations, receipts.

Comfortable with REST APIs, webhooks and async job processing (Redis, queues).

Git, code review, environment-based deployments.

Nice to have

Shipped an ERC-3643 / T-REX deployment or other RWA / security-token platform.

Crypto exchange or fintech background.

Exposure to custodial wallet architecture, HD wallets or MPC/HSM signing.

Experience with Tatum, Fireblocks, Alchemy or similar.

Docker, CI/CD, Azure or AWS.

Awareness of AML/KYT and compliance tooling.

You should apply if

You have shipped real on-chain money movement, understand why a compliant token can reject a transfer, and can debug a failed withdrawal end-to-end without hand-holding.