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Himanshu G., Blockchain Engineer

Last Updated: 4 Jul 2023

- Blockchain Developer with 5+ yrs of experience - Motivated to learn and deploy new technologies to bring transparency, decentralization, security & equality at low cost. - Advance Daaps development: Solidity+Web3(React) - Layer 2 Scaling Solution (Polygon), Avalanche(AVAX) - NFT Marketplace(ERC - 721/1155), Crypto Payment Solutions & DeFi Cross Chain Bridges - ERC-20 Tokens, ICO, DEX, Staking, Swapping - DAO + Multi-Sigs Wallets - Available ASAP

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Serhii, Solidity & Full-stack Web3 Engineer, Architect, Team-Lead.

Last Updated: 15 Mar 2024

• 15+ years of commercial software development experience • Solid knowledge of Solidity, C++, JavaScript, TypeScript; • Deep understanding of blockchain architecture and smart contract logic; • Cosmos, Tron, Avalanche, Binance Smart Chain, Ethereum dApps; • Strong skills in developing NFT smart contracts. Support and payload verification; • NFT Marketplaces (ERC - 721/1155), Crypto Payment Solutions & DeFi Cross Chain Bridges - ERC-20 Tokens, ICO, DEX, Staking, Swapping; • Highly qualified knowledge of Stripe payment system integration to blockchain data; • 10+ years experience working with Python; • 5 years experience working with Node.js; • Strong abilities with Express; • Experience working with Docker, and Kubernetes (K8s); • 3+ years of development experience with React.js. • No scheduled vacations within the next 3 months;

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NFT (non-fungible token)

NFT (non-fungible token)


Node.js   5 yr.


React   3 yr.

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Last Updated: 29 Mar 2024

Blockchain Developer and Software Engineer with over 5 years of hands-on experience. Skilled in multiple key programming languages including Rust, Solidity, Python, JavaScript, and TypeScript, and proficient in English with a B2 level. Holds a comprehensive education in Computer Science and Software Engineering. Technical expertise is demonstrated in diverse blockchain environments like Ethereum, Polygon, and Solana, including advanced skills in smart contracts development, security optimizations, and integration of various blockchain technologies. Proven track record in backend development with frameworks such as Django and Node.js, cloud services like AWS, and proficiency in DevOps tools such as Docker, Kubernetes, and Terraform. Successfully improved deployment speeds by 40% through Helm charts and bolstered smart contract security to mitigate 95% of exploit vectors. Combines a passion for programming with effective leadership and project management abilities which contributes to technological advancements and project success.

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Rust   3 yr.


TypeScript   2 yr.


Solidity   2 yr.

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Alexey O., Full-stack Developer

Last Updated: 4 Jul 2023

• 5+ years of practical experience • Upper-Intermediate English level. • 5 years of professional experience in the Information Technologies (IT) industry. • Experience in development on the Microsoft .NET platform (C#, ASP.NET MVC, ASP.NET Web API). • Skilled in Full-stack development. • Experience with Blockchain Smart contracts development. • Experience in developing database architecture. • Experience with writing unit tests.

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ASP.NET Core Framework

ASP.NET Core Framework

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Kate, Blockchain developer / Software Engineer

Last Updated: 13 Nov 2023

- Blockchain developer / Software Engineer with 5 years of experience in the field. - Proficient in programming languages such as Solidity, Rust, and Python. - Extensive knowledge and experience in blockchain technologies including Ethereum, Optimism, Waffle, Truffle, and Ganache. - Skilled in backend development using frameworks like Django, Django Rest Framework, and FastAPI. - Experienced in working with databases like PostgreSQL and MongoDB. - Proficient in cloud services and DevOps tools such as AWS, Docker, and Docker Compose. - Strong expertise in version control systems like Git and collaboration platforms like Bitbucket and GitHub.

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ERC-20   5 yr.


Rust   2 yr.


Python   4 yr.

Ethereum blockchain (ETH)

Ethereum blockchain (ETH)   3 yr.


DAO   2 yr.

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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched ERC-20 Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new ERC-20 developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present ERC-20 candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

TOP 10 ERC-20 Related Technologies

  • Python

    Python is a widely used programming language for ERC-20 software development. Known for its simplicity and readability, it offers a vast ecosystem of libraries and frameworks that facilitate blockchain development. Its versatility and strong community support make it a popular choice for building smart contracts and decentralized applications (DApps).

  • Solidity

    Solidity is a high-level programming language specifically designed for writing smart contracts on the Ethereum platform. It is the most widely used language for ERC-20 token development. Solidity provides features like inheritance, libraries, and complex user-defined types, making it suitable for creating secure and robust smart contracts.

  • Truffle

    Truffle is a development framework that simplifies the process of building, testing, and deploying Ethereum-based applications. It provides a suite of tools for smart contract compilation, deployment, and testing. Truffle also integrates with popular testing frameworks like Mocha and Chai, enabling developers to write comprehensive unit tests for their ERC-20 tokens.

  • Remix

    Remix is a web-based IDE (Integrated Development Environment) specifically designed for Ethereum smart contract development. It offers a user-friendly interface for writing, testing, and deploying ERC-20 tokens. Remix provides features like syntax highlighting, debugging tools, and integration with Metamask for easy deployment to the Ethereum network.

  • Ganache

    Ganache is a personal Ethereum blockchain that allows developers to create a local testing environment for their ERC-20 tokens. It provides a simulated blockchain network with customizable settings, making it ideal for testing and debugging smart contracts before deploying them to the main Ethereum network.

  • Web3.js

    Web3.js is a JavaScript library that allows developers to interact with the Ethereum blockchain. It provides a set of APIs for reading from and writing to smart contracts, managing user accounts, and listening to blockchain events. Web3.js simplifies the integration of ERC-20 tokens into web applications and enables seamless interaction with the Ethereum network.

  • OpenZeppelin

    OpenZeppelin is a library of secure and audited smart contracts that can be used as a foundation for ERC-20 token development. It provides pre-built contracts for common functionalities like token minting, ownership transfers, and access control. OpenZeppelin follows best practices for security and has undergone extensive auditing by the blockchain community.

Pros & cons of ERC-20

7 Pros of ERC-20

  • Standardization: ERC-20 is a widely adopted standard for creating tokens on the Ethereum blockchain. This standardization allows for interoperability and compatibility between different ERC-20 tokens.
  • Easy Token Creation: ERC-20 provides a straightforward and well-defined set of rules for creating tokens. This makes it easier for developers to create their own tokens and launch Initial Coin Offerings (ICOs).
  • Liquidity: ERC-20 tokens are supported by a vast number of cryptocurrency exchanges, which provides liquidity and facilitates trading. This makes it easier for token holders to buy and sell ERC-20 tokens.
  • Smart Contract Functionality: ERC-20 tokens are built on the Ethereum blockchain, which enables the use of smart contracts. Smart contracts allow for the automation of token transfers, making transactions more efficient and secure.
  • Compatibility with Wallets: ERC-20 tokens can be stored and managed using a wide range of Ethereum-compatible wallets. This provides users with flexibility and convenience in managing their token holdings.
  • Community Support: The ERC-20 standard has a large and active community of developers, which fosters collaboration, innovation, and the sharing of best practices. This community support can be beneficial for developers seeking guidance or looking to contribute to the ecosystem.
  • Interoperability: ERC-20 tokens can interact with other Ethereum-based protocols and decentralized applications (dApps). This interoperability allows for seamless integration with various services and platforms within the Ethereum ecosystem.

7 Cons of ERC-20

  • Scalability Limitations: The Ethereum blockchain, on which ERC-20 tokens are built, faces scalability challenges, resulting in high transaction fees and slower processing times during periods of network congestion.
  • Security Vulnerabilities: Smart contracts underlying ERC-20 tokens are prone to security vulnerabilities if not properly audited and tested. Exploits or bugs in smart contracts can lead to the loss of funds or compromise the integrity of the token.
  • Regulatory Uncertainty: The regulatory landscape for cryptocurrencies and token offerings is constantly evolving. Compliance with regulations can be complex and may vary across jurisdictions, posing legal and regulatory risks for ERC-20 projects.
  • Token Compatibility Issues: While ERC-20 tokens adhere to a common set of rules, there can still be variations in how tokens are implemented. This can lead to compatibility issues when interacting with different wallets, exchanges, or dApps.
  • Token Loss Risk: ERC-20 tokens are typically stored in Ethereum wallets, and if users lose access to their wallets or private keys, they may permanently lose their tokens. This risk highlights the importance of proper security measures and backup strategies.
  • Centralization Concerns: Although ERC-20 tokens are built on a decentralized blockchain, the distribution and control of tokens can be concentrated in the hands of a few individuals or entities. This centralization can undermine the intended benefits of decentralization.
  • Lack of Upgradability: Once an ERC-20 token is deployed on the Ethereum blockchain, its code cannot be modified. This lack of upgradability can pose challenges if there is a need to fix bugs, add new features, or adapt to changing market conditions.

What are top ERC-20 instruments and tools?

  • MyEtherWallet: MyEtherWallet is a free, open-source, client-side interface for creating and managing Ethereum wallets. It was launched in 2015 and has gained popularity for its user-friendly interface and robust security features. With MyEtherWallet, users can easily store, send, and receive ERC-20 tokens, making it a widely used tool in the Ethereum ecosystem.
  • MetaMask: MetaMask is a browser extension that allows users to interact with the Ethereum blockchain directly from their web browser. It provides a secure wallet for storing ERC-20 tokens and enables seamless integration with decentralized applications (dApps). MetaMask was first released in 2016 and has since become one of the most widely used Ethereum tools, with millions of active users.
  • Gnosis Safe: Gnosis Safe is a multi-signature wallet designed to enhance the security of managing ERC-20 tokens. It allows users to set up multi-factor authentication and manage their tokens through a user-friendly interface. Gnosis Safe was introduced in 2017 and has gained recognition for its robust security features, making it a popular choice for individuals and organizations looking to secure their ERC-20 tokens.
  • Truffle Suite: Truffle Suite is a development framework for Ethereum that provides a suite of tools for smart contract development, testing, and deployment. It includes Truffle, a popular development environment, and Ganache, a personal Ethereum blockchain for local testing. Truffle Suite was first released in 2015 and has since become the go-to choice for many developers working on ERC-20 token projects.
  • Etherscan: Etherscan is a blockchain explorer specifically designed for the Ethereum network. It allows users to explore and search for transaction details, smart contracts, and ERC-20 token balances. Etherscan was launched in 2015 and has become a widely used tool for Ethereum enthusiasts, researchers, and developers to monitor and analyze ERC-20 token activities on the blockchain.
  • Tokenlon: Tokenlon is a decentralized exchange (DEX) built on the Ethereum blockchain. It allows users to trade ERC-20 tokens directly from their wallets without the need for a centralized intermediary. Tokenlon was launched in 2020 and has gained popularity for its low fees, fast transaction speeds, and extensive token selection, making it a preferred choice for ERC-20 token traders.
  • OpenZeppelin: OpenZeppelin is an open-source framework that provides secure and audited smart contracts for building ERC-20 tokens and other Ethereum-based applications. It offers a library of reusable and community-vetted contracts that adhere to best practices in terms of security and functionality. OpenZeppelin has been actively maintained since 2016 and is widely used by developers to ensure the reliability and security of their ERC-20 token projects.
  • Uniswap: Uniswap is a decentralized exchange protocol built on the Ethereum blockchain. It enables users to trade ERC-20 tokens directly from their wallets through liquidity pools, eliminating the need for traditional order books. Uniswap was launched in 2018 and has gained significant traction, becoming one of the most widely used decentralized exchanges for ERC-20 token trading.

Soft skills of a ERC-20 Developer

Soft skills are essential for ERC-20 developers as they not only need to possess technical knowledge but also need to effectively communicate, collaborate, and adapt in a fast-paced environment. Here are the soft skills required for ERC-20 developers at different levels:


  • Strong problem-solving skills: Ability to analyze and troubleshoot issues related to ERC-20 development.
  • Attention to detail: Being meticulous in writing and reviewing smart contracts to ensure accuracy and security.
  • Good communication skills: Clear and concise communication with team members and stakeholders.
  • Ability to learn quickly: Adaptability to new technologies and programming languages.
  • Team player: Willingness to collaborate and work in a team-oriented environment.


  • Project management skills: Ability to prioritize tasks, meet deadlines, and manage resources effectively.
  • Leadership qualities: Taking ownership of projects and guiding junior developers.
  • Analytical thinking: Applying critical thinking skills to resolve complex ERC-20 development challenges.
  • Effective documentation: Documenting code, processes, and project requirements for future reference.
  • Adaptability: Being open to change and willing to learn new technologies and frameworks.
  • Strong problem-solving skills: Handling and resolving issues related to smart contracts and blockchain integration.
  • Excellent communication skills: Effective communication with cross-functional teams and stakeholders.


  • Strategic thinking: Developing long-term plans and strategies for ERC-20 development projects.
  • Mentorship: Mentoring and guiding junior and middle-level developers in their professional growth.
  • Technical leadership: Providing technical expertise and guidance to the development team.
  • Collaboration: Building strong relationships with stakeholders and effectively collaborating with other teams.
  • Decision-making: Making informed decisions based on data analysis and industry best practices.
  • Innovation: Driving innovation and exploring new possibilities in ERC-20 development.
  • Conflict resolution: Resolving conflicts and fostering a positive and productive work environment.

Expert/Team Lead

  • Strategic planning: Developing and executing strategic plans for ERC-20 development initiatives.
  • Team management: Managing and leading a team of ERC-20 developers, providing guidance and support.
  • Business acumen: Understanding the business implications and opportunities of ERC-20 development.
  • Industry knowledge: Keeping up-to-date with the latest trends and advancements in blockchain technology.
  • Thought leadership: Contributing to the blockchain community through research, publications, and presentations.
  • Risk management: Identifying and mitigating risks associated with ERC-20 development projects.
  • Negotiation skills: Negotiating contracts and agreements with external vendors and partners.
  • Strategic partnerships: Building strategic partnerships to enhance ERC-20 development capabilities.
  • Continuous learning: Continuously updating skills and knowledge in the rapidly evolving blockchain industry.
  • Empathy and emotional intelligence: Understanding and addressing the needs and concerns of team members.
  • Effective communication: Clearly conveying complex technical concepts to non-technical stakeholders.

TOP 15 Facts about ERC-20

  • ERC-20 is a technical standard for tokens on the Ethereum blockchain.
  • It was proposed by Fabian Vogelsteller in November 2015 and became an official Ethereum Improvement Proposal (EIP-20).
  • ERC-20 defines a set of rules and functions that a token contract must implement, enabling developers to create and manage tokens on the Ethereum platform.
  • It has become the most widely adopted token standard on the Ethereum network, with thousands of ERC-20 tokens currently in existence.
  • ERC-20 tokens are fungible, meaning that each token is interchangeable with another token of the same type and value.
  • They are compatible with various Ethereum wallets, exchanges, and other smart contracts, allowing for seamless integration and interoperability.
  • ERC-20 tokens have a standardized set of functions, such as transferring tokens, checking balances, and approving token allowances.
  • They can represent various types of assets, including cryptocurrencies, utility tokens, security tokens, and more.
  • ERC-20 tokens have revolutionized the Initial Coin Offering (ICO) market, providing a simple and secure way for projects to raise funds through token sales.
  • ERC-20 tokens have contributed to the rapid growth of decentralized finance (DeFi) applications, enabling various financial services such as lending, borrowing, and decentralized exchanges.
  • They have significantly increased the liquidity and tradability of tokens, as ERC-20 tokens can be easily listed and traded on decentralized and centralized exchanges.
  • ERC-20 tokens have paved the way for tokenization of real-world assets, allowing for the representation of physical assets like real estate, art, and commodities on the blockchain.
  • ERC-20 tokens have established a common standard for token contracts, promoting interoperability and ease of integration among different decentralized applications (dApps).
  • ERC-20 tokens have inspired the creation of other token standards, such as ERC-721 (Non-Fungible Tokens) and ERC-1155 (Multi-Token Standard).
  • ERC-20 tokens have played a significant role in the overall development and adoption of blockchain technology, fueling innovation and creating new economic opportunities.

Cases when ERC-20 does not work

  1. Smart Contract Limitations: ERC-20 is a widely adopted token standard for creating tokens on the Ethereum blockchain. However, it has certain limitations that may make it unsuitable for certain use cases. For example, ERC-20 tokens cannot perform complex computations or execute more advanced logic within the token contract itself. If your project requires advanced functionality or complex business logic, ERC-20 may not be the ideal choice.
  2. Non-Fungible Tokens (NFTs): ERC-20 tokens are fungible, meaning each token is identical and interchangeable with any other token of the same type. However, if you need to create unique tokens, such as in the case of non-fungible tokens (NFTs), ERC-20 is not the appropriate standard. In such cases, you would need to use a different token standard like ERC-721 or ERC-1155, which allow for the creation of unique, indivisible tokens.
  3. Gas Efficiency: Gas fees are a crucial consideration when deploying and using smart contracts on the Ethereum network. ERC-20 tokens can be less efficient in terms of gas usage compared to other token standards. For instance, if you have a large number of token holders and need to perform frequent token transfers, the gas costs associated with ERC-20’s transfer function can become prohibitively expensive. In such scenarios, alternative token standards like ERC-777 or ERC-223 might be more gas-efficient options.
  4. Specific Token Functionality: Depending on your project requirements, ERC-20 may not provide the specific functionality you need. While ERC-20 offers basic token functionality such as transfer, balance checking, and approval mechanisms, it may lack certain features required for specialized use cases. For example, if you need to implement a voting mechanism, dividend distribution, or time-based lockups, you may have to explore other token standards or develop a custom smart contract to meet your specific needs.
  5. Interoperability: While ERC-20 is widely supported and can be easily integrated with various wallets, exchanges, and decentralized applications (DApps), there are cases where interoperability with other blockchain ecosystems is desired. If you aim to enable cross-chain compatibility or want to interact with platforms that do not support ERC-20 tokens, you may need to consider alternative token standards or explore interoperability protocols like Polkadot or Cosmos.

How and where is ERC-20 used?

Case NameCase Description
Decentralized ExchangesERC-20 tokens have revolutionized the decentralized exchange ecosystem by providing a standard protocol for the creation and trading of digital assets. With ERC-20 tokens, users can easily trade various cryptocurrencies directly on the blockchain without the need for intermediaries. This has increased liquidity and accessibility in the cryptocurrency market, allowing for faster and more efficient trading.
Tokenized AssetsERC-20 tokens have enabled the tokenization of real-world assets such as real estate, art, and commodities. By representing these assets as tokens on the Ethereum blockchain, they become easily tradable and divisible. This opens up new possibilities for fractional ownership, increased liquidity, and transparent ownership records. Tokenized assets also provide opportunities for crowdfunding and investment in previously illiquid markets.
Initial Coin Offerings (ICOs)ERC-20 tokens have become the standard for launching Initial Coin Offerings (ICOs), which are fundraising events where new cryptocurrencies are sold to investors. The ERC-20 standard provides a well-defined set of rules and protocols for creating and distributing tokens, making it easier for startups to launch their own ICOs. This has democratized the fundraising process, allowing projects to reach a global audience and raise capital more efficiently.
Loyalty and Reward ProgramsERC-20 tokens are being used to power loyalty and reward programs for businesses. By issuing tokens as rewards to customers, businesses can incentivize repeat purchases and customer engagement. These tokens can be easily exchanged for goods, services, or even other cryptocurrencies, creating a seamless and versatile rewards system. ERC-20 tokens also enable businesses to track and analyze customer behavior, leading to more targeted marketing strategies.
Supply Chain ManagementERC-20 tokens are being utilized to improve supply chain management by providing a transparent and secure way to track and authenticate products. By assigning unique tokens to each product, businesses can track its journey from manufacturer to consumer, ensuring authenticity, quality control, and preventing counterfeiting. This enhances trust and transparency in the supply chain and can lead to improved efficiency and reduced costs.
Decentralized Finance (DeFi)ERC-20 tokens have played a significant role in the growth of decentralized finance (DeFi) applications. DeFi platforms leverage smart contracts and ERC-20 tokens to enable various financial services such as lending, borrowing, and decentralized trading. These platforms provide users with more control over their finances, increased accessibility to financial services, and the ability to earn passive income through yield farming and staking.
Gaming and Non-Fungible Tokens (NFTs)ERC-20 tokens have been instrumental in the rise of blockchain-based gaming and non-fungible tokens (NFTs). NFTs are unique digital assets that can represent ownership of in-game items, virtual real estate, artwork, and more. ERC-20 tokens are used as the underlying currency for purchasing and trading these NFTs, providing a secure and transparent marketplace for gamers, collectors, and artists.
Cross-Platform CompatibilityERC-20 tokens are compatible with a wide range of wallets, exchanges, and dApps (decentralized applications) built on the Ethereum blockchain. This interoperability allows for seamless integration and transferability of tokens across different platforms. It also promotes the adoption of ERC-20 tokens as a standard for tokenized assets, making it easier for users to manage and interact with their digital assets.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting in the development and maintenance of software applications under the guidance of senior developers. Writing code based on provided specifications, conducting code reviews, and fixing bugs. Collaborating with the team to ensure timely project delivery.$50,000 – $70,000
Middle2-5 yearsDeveloping software applications independently, taking ownership of specific modules or features. Participating in the design and architecture discussions. Conducting code reviews, mentoring junior developers, and assisting in resolving technical issues. Collaborating with cross-functional teams to ensure smooth project execution.$70,000 – $90,000
Senior5-8 yearsLeading the development of complex software systems and driving technical decisions. Mentoring and providing guidance to junior and middle developers. Collaborating with product managers and stakeholders to define project requirements. Conducting code reviews, ensuring code quality and performance optimization.$90,000 – $120,000
Expert/Team Lead8+ yearsLeading development teams and managing multiple projects simultaneously. Providing technical leadership and guidance to the team. Setting coding standards, best practices, and ensuring adherence. Collaborating with cross-functional teams to define project goals and timelines. Responsible for overall project success and delivery.$120,000 – $150,000+

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