ai analyst backend bitcoin blockchain community manager crypto cryptography cto customer support dao data science defi design developer relations devops discord economy designer entry level erc erc 20 evm front end full stack gaming ganache golang hardhat intern java javascript layer 2 marketing mobile moderator nft node non tech open source openzeppelin pay in crypto product manager project manager react refi research ruby rust sales smart contract solana solidity truffle web3 py web3js zero knowledge
| Job Position | Company | Posted | Location | Salary | Tags |
|---|---|---|---|---|---|
Qredo | Madrid, Spain | $64k - $87k | |||
Qredo | Madrid, Spain | $67k - $102k | |||
Qredo | Lisbon, Portugal | $77k - $100k | |||
Seedify | Remote | $72k - $93k | |||
| Learn job-ready web3 skills on your schedule with 1-on-1 support & get a job, or your money back. | | by Metana Bootcamp Info | |||
Seedify | Remote | $72k - $93k | |||
Qredo | Paris, France | $90k - $150k | |||
Qredo | Madrid, Spain | $63k - $80k | |||
Qredo | Lisbon, Portugal | $57k - $112k | |||
Qredo | Lisbon, Portugal | $31k - $81k | |||
Qredo | Amsterdam, Netherlands | $98k - $120k | |||
Qredo | Madrid, Spain | $81k - $90k | |||
Qredo | Madrid, Spain | $86k - $100k | |||
Binance | New York, NY, United States |
| |||
Gnosis | Remote |
| |||
Coinmarketcap | Calgary, Canada | $72k - $100k |
Qredo
$64k - $87k estimated
This job is closed
Manual QA Engineer
Madrid, Spain /
Engineering â QA /
Full-time Remote
/ Remote
Apply for this job
Qredo is a decentralized digital asset management infrastructure and product suite designed to unlock new opportunities for institutional investors in digital assets and decentralized finance. Qredo's Layer 2 blockchain protocol enables users to seamlessly transfer and settle BTC, ETH, and ERC-20 tokens. Assets are secured by Qredoâs advanced Gen 2.0 multi-party computation (MPC), which provides tier-1 bank security and institutional-grade governance.
Quality Assurance plays an important part in our companyâs product development process. We are looking for an engineer with strong experience in all QA domains. Our ideal candidate is a well-rounded QA professional, capable of taking ownership of the QA function inside a cross functional team.
*** This is a remote opportunity. We welcome candidates around the globe to apply! ***
Responsibilities
- Assist in maintaining and developing automated test scenarios in Python for API, Web and Native apps.
- Hands-on manual investigation and reproduction of functional backend software issues.
- Root cause analysis of existing test script failures.
- Identification of current test script deficiencies and candidates for additional scripted coverage.
- Recommend improvements in software to enhance user experience.
- Investigatory testing of unreleased features including defining requirements, behaviour and impact.
- Documentation and design of candidate test scenarios for the above.
Requirements
- 4+ years of backend QA engineering experience.
- Full cycle testing from designing manual tests, developing scripts and execution.
- Strong experience with UNIX/Linux.
- Scripting ability using Python.
- Understanding of database concepts and queries (SQL, Postgres, Mongo).
- Experience testing backend services such as APIs, Databases, distributed services (non-monolithic).
- Exposure to web technologies (HTTP, XML, REST, HTML, WebSockets, etc).
- Exposure to load testing tools (K6, Artillery, Locust).
- Excellent command of the English.
Qredo offers
- Flexibility to work from anywhere and possibility for international transfer.
- Assistance with home office setup as well as offsite team building allowance.
- Culturally diverse work environment (we speak 33 languages!).
- Great career development opportunities in a growing company.
- Competitive compensation and benefits package within the industry.
Apply for this job
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.