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This job is closed
Title:Senior Solidity Smart Contract Developer
Location: Remote (Global)
Comp: $ 100k- $150k Annual
About Upside: Upside is a blockchain-focused Web3 company focused on how blockchain technology and cryptocurrency can improve the way organizations operate, while democratizing access for contributors to interesting and valuable projects. We believe being a remote organization is an advantage, and we believe in the power of asynchronous work. To that end, we foster a collaborative community that can come together as individuals and in teams to build something truly special.
Why This Role Exists
We are looking for experienced Senior Solidity Smart Contract developers to help work on our open source smart contract protocol. This includes the development of DAOs, NFTs, tokens, and wallet infrastructure across many blockchains like Ethereum, Solana, Avalanche, Polygon and Algorand.
The right developer will have extensive Solidity Smart Contract coding experience, the ability to self-manage and prioritize, clear and consistent communication skills, and a desire to write production level smart contracts that people will use at scale.
This role requires someone special: an expert developer that consistently ships high quality code, with the ability to maintain a strategic perspective on the why of our features, not just the what.
Skills + Requirements:
- Solid, proven experience with Ethereum solidity
- Javascript blockchain libraries such as Ethers.js, Web3.js, Hardhat and Truffle
- Proven knowledge of Ethereum Standards such as ERC20 and ERC721, and proficiency with Solidity and EVM based blockchains
- Proven knowledge of Javascript blockchain libraries such as Ethers.js, Web3.js, Hardhat and Truffle
- Background in automated testing with Javascript
- Working with security auditors to address vulnerabilities
Qualities:
- You are kind, caring and genuine. We lead with kindness.
- You are motivated and appreciate the latitude of your work
- You appreciate your independence and ask questions (Slack is our favorite!)
- You are able to accept feedback constructively
Traits We Value
- Entrepreneurial: we’re a startup. We’re looking for high integrity people who have founded companies, started community groups and launched creative projects because they were driven to. The traits that embody this entrepreneurial spirit are:
- Confident builder in bringing new things into the world
- Resiliency on the roller coaster of highs and lows that come with putting something new in the world
- Decisiveness in making decisions under situations of uncertainty with consequences
- Risk Discernment - knows that making important things requires taking the right risks and is comfortable evaluating which risks to take and which risks to avoid.
- Adventurousness in ambiguous and new situations
- Thoughtful and generous, those who are great giving and receiving feedback
- Team players - we are first a foremost a team driven to build great things, and that includes our team
This job is for an individual developer working full time and not an agency.
This job is 100% remote.
What is ERC20 example?
ERC20 is a standard for fungible tokens on the Ethereum blockchain
Here is an example of an ERC20 token
Let's say we create a new ERC20 token called ABC Token with a total supply of 1,000,000 tokens
Each token will be divisible up to 18 decimal places
To implement the ERC20 standard, we will need to define several functions, including:
- balanceOf(address): Returns the token balance of a specific address.
- transfer(address to, uint256 value): Transfers tokens from the caller's address to the specified address.
- approve(address spender, uint256 value): Approves a specific address to spend a certain amount of tokens on behalf of the caller.
- allowance(address owner, address spender): Returns the amount of tokens approved by the owner that the spender can transfer.
- User1 owns 500,000 ABC Tokens.
- User2 wants to buy 100 ABC Tokens from User1.
- User1 approves User2 to spend up to 100 ABC Tokens on her behalf.
- User2 calls the transferFrom() function with User1's address, his own address, and the value of 100 tokens.
- The transferFrom() function deducts 100 tokens from User1's balance and adds them to User2's balance.