| Job Position | Company | Posted | Location | Salary | Tags |
|---|---|---|---|---|---|
SMASH | San Jose, CA, United States | $96k - $112k | |||
SMASH | San Jose, CA, United States | $72k - $100k | |||
Molecule | New York, NY, United States | $90k - $115k | |||
Molecule | New York, NY, United States | $72k - $90k | |||
| Learn job-ready web3 skills on your schedule with 1-on-1 support & get a job, or your money back. | | by Metana Bootcamp Info | |||
molecule.xyz | Berlin, Germany | $85k - $115k | |||
molecule.xyz | New York, NY, United States | $77k - $105k | |||
CillarCoin | New York, NY, United States | $90k - $162k | |||
Biostate AI | Dallas, TX, United States | $133k - $135k | |||
Molecule | United States | $84k - $120k | |||
molecule.xyz | United States | $76k - $112k | |||
molecule.xyz | United States | $90k - $150k | |||
SMASH | United States | $98k - $105k | |||
D3 | San Francisco, CA, United States | $122k - $150k | |||
Weekday AI | Delhi, India | $36k - $54k | |||
molecule.xyz | Remote | $76k - $150k |
SMASH, Who we are?
We are agents for tech professionals in Costa Rica and Colombia that help them build careers in the United States.
We believe in long-lasting relationships with our talent. We invest time getting to know them and understanding what they seek as their professional next step.
We aim to find the perfect match. As agents, we pair our talent with our US clients, not only by their technical skills but as a cultural fit. Our core competency is to find the right talent fast.
We purposefully move away from the âcontractorâ or âoutsourcingâ type of relationship. Our clients donât want contractors or âjust a service.â Neither does our talent.
Our Benefits
- Wellness Coverage
- Remote Work
- Birthday day off
- Recognition and rewards system
- Referrals Program
- Business skill coaching
- English classes for Smashers and relatives
- Learning opportunities
This position is Remote to work with a US Company; you will require to have Citizenship or a work permit from Costa Rica or Colombia to apply for this role.
Responsibilities:
- Develop backend logic using Node.js and Express.js.
- Implement real-time gameplay with WebSocket/Socket.IO for multiplayer chess matches.
- Build APIs for matchmaking, player stats, leaderboards, tournaments, and authentication.
- Integrate backend with Ethereum smart contracts for tokens/NFT operations.
- Manage database, caching, and performance optimization.
- Node.js, Express.js
- MongoDB, Redis
- JWT (Authentication/Authorization)
- Web3.js / Ethers.js (Server-side)
- AWS S3 / Cloudinary (media uploads)
- Bcrypt.js (secure passwords)
- Nodemailer / SendGrid (emails)
- Cron Jobs (Node-cron)
- Ethereum (ERC-20 & ERC-721 standards), Solidity, Hardhat
- Alchemy / Infura, IPFS, Pinata
- OpenZeppelin Contracts
- WalletConnect API â seamless wallet integration (MetaMask, Trust Wallet, etc.).
- CoinGecko / CoinMarketCap API â real-time token price data.
- Moralis API â blockchain indexing, authentication, and on-chain event tracking.
- Firebase Cloud Messaging (FCM) â push notifications for matches and tournaments.
- Sentry API â error tracking and performance monitoring.
- Google OAuth / Apple Sign-In â user onboarding/authentication.
- ReCAPTCHA API â bot prevention in registration/login.
- Mailgun / SendGrid API â transactional email delivery.
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.