Building an ERC20 Token Vesting Contract in Solidity
etherum solidity project
I am a software engineer with a strong background in competitive programming and backend focused development.
I graduated in IT from Army Institute of Technology, Pune (2025) and currently work at NxtWave, where I build and review technical content around data structures, algorithms, and problem solving.
My recent work is focused on smart contract and protocol development using Solidity and Foundry. I enjoy building systems where correctness, security, and clear invariants matter such as token vesting, staking mechanisms, and upgradeable protocols.
Earlier, I spent several years in competitive programming (Codeforces Expert, 5★ CodeChef), which shaped how I approach problem solving, edge cases, and testing.
On this blog, I write about the design and implementation of smart contracts, testing strategies, and engineering tradeoffs I encounter while building Web3 protocols.
Building an ERC20 Token Vesting Contract in Solidity
Token distribution is one of the most sensitive parts of any Web3 project.
If done incorrectly, it can lead to early sell-offs, broken incentives, and loss of trust.
I wanted to understand how real projects handle this problem, so I built an ERC20 token vesting contract from scratch.
The problem
Sending tokens directly to contributors or advisors gives no guarantee that:
Tokens stay locked
Incentives remain aligned
Funds are protected if someone exits early
Most serious projects solve this using vesting contracts.
What I built
A Solidity-based ERC20 vesting contract that:
Locks tokens until a cliff period
Releases tokens gradually over a fixed duration
Lets beneficiaries claim only what’s vested
Allows the owner to revoke unvested tokens
Is fully covered with Foundry tests
images
Key learnings
How cliff and linear vesting are calculated on-chain
Why time-based edge cases can easily introduce bugs
How testing improves confidence in financial smart contracts
What’s next
I plan to add:
A simple frontend dashboard
Support for multiple beneficiaries
Better UX for claiming tokens
Code
Deploy link : https://vesting-rf6y7hrtu-harsh-kumar-rais-projects.vercel.app/
Project focus: Smart contract design & security.
Basic frontend added only for interaction.
Building slowly, understanding deeply, and learning in public.
