Blockchain Engineering Intern

Context

Securrency is a fintech company specializing in blockchain-based solutions for institutional finance — specifically the tokenization of securities (stocks, bonds, real estate) on distributed ledgers. I interned as a blockchain engineer during the summer of 2022.

What I Did

• Smart contract development: Wrote and tested Solidity smart contracts implementing ERC-1400 (security token standard) for compliant tokenization of financial instruments
• Backend services: Built Node.js/TypeScript services for interacting with deployed contracts, monitoring transactions, and providing REST APIs for the frontend
• Testing: Comprehensive test suites using Hardhat for contract testing, including edge cases around transfer restrictions, compliance rules, and access control
• Security review participation: Assisted in internal security reviews of smart contracts, learning about common vulnerabilities (reentrancy, integer overflow, front-running)

Impact

• Delivered smart contract implementations that passed internal security review
• Backend services integrated into the staging environment for client demonstrations
• Documentation I wrote was adopted as template for future intern onboarding

What I Learned

• Smart contract development requires a different mindset — immutability means bugs are permanent and costly
• The intersection of finance and technology involves heavy regulatory compliance considerations
• Working in a fast-paced startup environment with direct access to senior engineers and founders
• First exposure to a professional engineering environment, which shaped my expectations for future roles