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Rogerio F., Senior Solidity Developer

Bauru, Brazil
Last Updated: 4 Jul 2023

- 4 years of experience in Ethereum blockchain and Solidity programming. - 2 years of experience in C , Python programming. - Highly professional blockchain developer with comprehensive accomplishments applying high-security smart contracts to ensure success and achieve goals. - Strong experience in EVM-compatible smart contracts development. Demonstrated success developing and seamlessly executing smart contracts in complex DeFi and DEX structures. - Upper-Intermediate English - Available ASAP

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Tina, Solidity Smart Contract Developer

Last Updated: 4 Jul 2023

- Experience working with Solidity; - Good understanding of Blockchain technology; - 3+ years of experience in Smart Contract development; - Deep skills with Hardhat, and Truffle; - Experience working with ethers.js and Web3.js; - Good knowledge of Ethereum, and BNB Chain; - Experience working on dApps, DeFi, and NFT projects; - In-depth abilities in creating and deploying ERC20, ERC721, ERC1155, BEP20, and BEP721 tokens; - Intermediate English.

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Sethu R., Blockchain/Solidity Engineer

Last Updated: 4 Jul 2023

- A dedicated and goal-oriented individual with 3+ years of experience in the field of blockchain research and development; - Developed a blockchain prototype application that helps track the expenditure of public funds; - Conducted workshops, seminars, and webinars for students and professionals on various blockchain technologies; - Developed blockchain smart contracts for a central government-funded vaccination supply chain management project using Solidity; - Available: ASAP.

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Andrews R., Solidity Engineer, Product Manager

Last Updated: 4 Jul 2023

- Developer with 18+ years of experience in large IT companies , with Bachelor’s Degree in Systems Analysis and Blockchain Engineer training. - Developer of Smart Contracts and tokens since 2017 (Solidity -EVM ) and a great enthusiast participant in the world of cryptocurrencies since 2014. - Data Science Academy Mentor in 2020. - Advanced English. - Available ASAP.

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NFT (non-fungible token)

Smart Contracts

Smart Contracts

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Luan P., Senior Go/Solidity Blockchain Engineer

Sao Paulo, Brazil
Last Updated: 4 Jul 2023
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Acquired a bachelor's degree in Information Systems from UNIVEM in Brazil. Since 2014 work as a Web Developer and since 2021, I have been working closely with Web3 technologies. I always look to broaden my knowledge in the area and enjoy participating in new projects. - 8+ years experience in software development; - 5+ years experience with Ruby on Rails; - 3+ years experience with React / Next; - Experience working on projects related to the NFT marketplace and Web3 integration; - Good skills use Solidity for creating smart contracts (ERC-721 tokens); - Experience working with TypeScript, Go on different blockchain projects; - Worked with projects in the field of DeFi and DAO; - Intermediate English; - Available ASAP.

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Ruby on Rails (RoR)

Ruby on Rails (RoR)



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Table of Contents

Cases when Solidity does not work

  1. Unsupported Data Types: Solidity, being a statically-typed language, has limited support for data types compared to dynamically-typed languages. It does not support complex data types such as sets, maps, or linked lists. This can be problematic when attempting to implement certain algorithms or data structures that heavily rely on these data types.
  2. Gas Limitations: Solidity is designed to run on the Ethereum blockchain, which imposes gas limitations on the execution of smart contracts. Gas is a unit used to measure the computational effort required to execute operations on the Ethereum network. If a Solidity contract exceeds the gas limit, it will fail to execute. This can be a challenge when dealing with complex or resource-intensive smart contracts.
  3. Security Vulnerabilities: Solidity, like any programming language, is prone to security vulnerabilities. Smart contracts written in Solidity have experienced various security issues such as reentrancy attacks, integer overflows/underflows, and unchecked external calls. These vulnerabilities can lead to the loss or manipulation of funds and sensitive data.
  4. Scalability: Solidity-based smart contracts deployed on the Ethereum network face scalability challenges due to the limitations of the underlying blockchain. Ethereum’s current architecture and consensus mechanism (Proof of Work) impose restrictions on transaction throughput and block size. This can result in slower transaction processing times and higher gas costs.
  5. Code Immutability: Solidity contracts are immutable once deployed on the Ethereum blockchain. This means that any bugs or vulnerabilities discovered in the contract cannot be easily remedied without deploying a new contract. This lack of upgradability can be problematic when trying to fix issues or update functionality in live contracts.

How and where is Solidity used?

Case NameCase Description
Decentralized Finance (DeFi)Solidity development is widely used in the field of decentralized finance (DeFi). Smart contracts written in Solidity enable the creation of various financial applications such as lending platforms, decentralized exchanges, stablecoins, and yield farming protocols. These applications automate financial transactions, remove intermediaries, and provide users with greater control over their assets. Solidity’s security features help ensure the integrity and trustworthiness of these decentralized financial systems.
TokenizationSolidity is commonly employed for tokenization purposes. By writing smart contracts in Solidity, developers can create and manage their own tokens on blockchain platforms like Ethereum. Tokenization allows for the representation of real-world assets, such as real estate or company shares, as digital tokens. These tokens can then be traded, transferred, and stored securely on the blockchain, providing greater liquidity and accessibility to traditionally illiquid assets.
Supply Chain ManagementSolidity development plays a crucial role in supply chain management by implementing transparent and traceable systems. Smart contracts written in Solidity can be used to track the movement of goods across the supply chain, ensuring authenticity, preventing counterfeiting, and enhancing efficiency. By recording relevant information on the blockchain, supply chain participants can easily verify the origin, quality, and ownership of products, leading to increased trust and reduced fraud.
Voting SystemsSolidity is utilized in the development of secure and transparent voting systems. By creating smart contracts in Solidity, developers can build decentralized voting platforms that eliminate the need for centralized authorities and provide tamper-proof voting records. These systems ensure the integrity of the voting process, prevent double voting, and enable verifiable and auditable elections. Solidity’s robustness and immutability make it an ideal choice for building reliable voting mechanisms.
Decentralized Applications (DApps)Solidity is extensively used for building decentralized applications (DApps) on blockchain platforms. DApps leverage smart contracts written in Solidity to enable peer-to-peer interactions without relying on intermediaries. These applications can span various domains, including gaming, finance, social media, and more. Solidity’s programming capabilities and compatibility with Ethereum make it a popular choice for developers seeking to create decentralized and autonomous applications.

What are top Solidity instruments and tools?

  • Solidity: Solidity is a high-level programming language used for writing smart contracts on the Ethereum platform. It was developed by Gavin Wood, Christian Reitwiessner, and others in 2014. Solidity has gained popularity due to its simplicity and the wide adoption of the Ethereum blockchain. It allows developers to write smart contracts that can be executed on the Ethereum Virtual Machine (EVM).
  • Truffle: Truffle is a development framework for Ethereum that provides a suite of tools for building, testing, and deploying smart contracts. It was created by Tim Coulter in 2015 and has become one of the most widely used development frameworks in the Ethereum ecosystem. Truffle simplifies the process of compiling, deploying, and interacting with smart contracts, making it easier for developers to build decentralized applications (dApps).
  • Remix: Remix is a web-based integrated development environment (IDE) for writing, testing, and deploying smart contracts. It was developed by the Ethereum Foundation and released in 2016. Remix provides a user-friendly interface with various features such as code highlighting, debugging, and a built-in compiler. It allows developers to write and test Solidity code directly in the browser, making it accessible to beginners and experienced developers alike.
  • Ganache: Ganache is a personal Ethereum blockchain for local development and testing purposes. It was originally developed by Truffle and is now maintained by the Truffle team. Ganache allows developers to create a local Ethereum network with pre-funded accounts for testing smart contracts. It provides a user-friendly interface and supports features like gas control, block exploration, and contract debugging.
  • OpenZeppelin: OpenZeppelin is an open-source library of reusable smart contracts for the Ethereum platform. It was created in 2016 and has since become a standard for secure and reliable smart contract development. OpenZeppelin offers a wide range of pre-built contracts for common functionalities such as tokenization, access control, and ownership management. It helps developers save time and reduce the risk of vulnerabilities by providing battle-tested and audited code.
  • Solc: Solc is the Solidity compiler, which translates Solidity source code into bytecode that can be executed on the Ethereum Virtual Machine (EVM). It is an essential tool for developers working with Solidity as it ensures the correct compilation and compatibility of smart contracts. Solc is part of the Ethereum ecosystem and is actively maintained by the Solidity team.
  • Ethers.js: Ethers.js is a JavaScript library for interacting with the Ethereum blockchain. It provides a simple and intuitive API for sending transactions, querying balances, and interacting with smart contracts. Ethers.js supports both Ethereum mainnet and test networks, making it a versatile tool for building decentralized applications.
  • Hardhat: Hardhat is a development environment and task runner for Ethereum smart contract development. It was created by Nomic Labs and released in 2020 as an alternative to Truffle. Hardhat offers a powerful and extensible toolset for compiling, testing, and deploying smart contracts. It integrates well with other tools like Ethers.js and supports advanced features such as built-in scriptable deployment and debugging.

Soft skills of a Solidity Developer

Soft skills are essential for a Solidity Developer as they contribute to effective communication, collaboration, and problem-solving abilities. These skills enable developers to work effectively in teams and deliver high-quality projects.


  • Active Listening: Ability to listen and understand instructions, requirements, and feedback from team members, stakeholders, and clients.
  • Adaptability: Willingness to learn and adapt to new technologies, frameworks, and programming languages.
  • Attention to Detail: Strong focus on writing clean and efficient code, ensuring accuracy and minimizing errors.
  • Collaboration: Ability to work well in a team environment, contribute ideas, and collaborate effectively with other developers and stakeholders.
  • Time Management: Efficiently managing time and prioritizing tasks to meet project deadlines.


  • Problem Solving: Analytical thinking and problem-solving skills to identify and resolve complex technical issues.
  • Communication: Clear and effective communication skills to convey ideas, discuss technical concepts, and provide updates to team members and stakeholders.
  • Leadership: Ability to take ownership of tasks, guide and mentor junior developers, and contribute to team success.
  • Teamwork: Collaborating with cross-functional teams, understanding different perspectives, and finding common ground to achieve project goals.
  • Resilience: Ability to handle pressure, adapt to changes, and overcome challenges in a dynamic and fast-paced environment.
  • Self-Motivation: Taking initiative, being proactive, and continuously learning to enhance skills and stay updated with industry trends.
  • Code Review: Providing constructive feedback on code quality, suggesting improvements, and ensuring adherence to best practices.


  • Project Management: Planning, organizing, and executing complex projects, coordinating with stakeholders, and ensuring timely delivery.
  • Mentoring: Mentoring and guiding junior and middle developers, sharing knowledge, and fostering their professional growth.
  • Technical Documentation: Creating comprehensive and clear technical documentation for projects, APIs, and libraries.
  • Client Management: Building and maintaining strong relationships with clients, understanding their requirements, and effectively addressing their concerns.
  • Quality Assurance: Implementing and enforcing coding standards, conducting code reviews, and ensuring high-quality code.
  • Strategic Thinking: Identifying long-term goals and strategies, evaluating technical solutions, and making informed decisions.
  • Risk Management: Identifying potential risks, devising contingency plans, and mitigating risks to ensure project success.
  • Continuous Improvement: Driving process improvements, adopting new technologies, and promoting best practices within the team and organization.

Expert/Team Lead

  • Architecture Design: Designing scalable, secure, and efficient software architectures for complex decentralized applications.
  • Technical Leadership: Providing technical guidance, setting technical direction, and overseeing the overall development process.
  • Team Management: Managing and leading a team of developers, assigning tasks, and ensuring efficient resource allocation.
  • Conflict Resolution: Resolving conflicts within the team, fostering a positive work environment, and promoting collaboration.
  • Strategic Planning: Developing long-term technology roadmaps, aligning them with business goals, and driving innovation.
  • Business Acumen: Understanding business requirements, market trends, and industry dynamics to make informed technical decisions.
  • Code Optimization: Optimizing code for performance, efficiency, and scalability, considering gas costs and blockchain limitations.
  • Community Engagement: Actively participating in the blockchain community, contributing to open-source projects, and sharing knowledge.
  • Client Acquisition: Identifying and pursuing new business opportunities, building relationships with potential clients, and driving sales.
  • Ethical Considerations: Understanding and adhering to ethical guidelines and best practices in blockchain development.
  • Project Estimation: Estimating project timelines, effort, and resources accurately, ensuring successful project execution.

Pros & cons of Solidity

9 Pros of Solidity

  • 1. Smart Contract Language: Solidity is specifically designed for writing smart contracts on the Ethereum platform. It provides a simple yet powerful syntax for expressing complex business logic.
  • 2. Widely Adopted: Solidity is the most popular programming language for Ethereum smart contracts. It has a large and active community of developers, which means there are plenty of resources and support available.
  • 3. Security: Solidity has built-in features and best practices to help developers write secure smart contracts. It includes features like function modifiers, access control, and input validation to prevent common vulnerabilities like reentrancy and overflow attacks.
  • 4. Interoperability: Solidity allows developers to interact with other smart contracts and external systems on the Ethereum blockchain. This enables the creation of complex decentralized applications (DApps) that can interact with multiple contracts and external services.
  • 5. Flexibility: Solidity supports various data types, including integers, booleans, strings, arrays, and structs. It also supports inheritance, interfaces, and libraries, allowing developers to create modular and reusable code.
  • 6. Tooling: Solidity has a rich ecosystem of development tools, including integrated development environments (IDEs), code analyzers, testing frameworks, and deployment tools. This makes it easier for developers to write, test, and deploy smart contracts.
  • 7. Upgradeability: Solidity supports contract upgradability through the use of proxy patterns and libraries. This allows developers to fix bugs, add new features, and improve contract functionality without disrupting existing deployments.
  • 8. Regulatory Compliance: Solidity provides features like events and timestamps, which can be used to implement regulatory requirements in smart contracts. This makes it possible to build decentralized applications that comply with legal and regulatory frameworks.
  • 9. Future-proof: Solidity is actively maintained and improved by the Ethereum community. It is constantly evolving to address new challenges and incorporate the latest advancements in blockchain technology.

9 Cons of Solidity

  • 1. Learning Curve: Solidity has its own syntax and programming paradigm, which may require developers to learn new concepts and patterns. This can be a barrier for developers with no prior experience in blockchain development.
  • 2. Security Risks: While Solidity provides tools for writing secure contracts, it’s still possible for developers to introduce vulnerabilities if they are not familiar with best practices and security considerations specific to blockchain development.
  • 3. Lack of Formal Verification: Solidity does not have built-in support for formal verification, which is a method for mathematically proving the correctness of smart contracts. This can make it harder to ensure the reliability and safety of complex contracts.
  • 4. Limited Tooling Maturity: While Solidity has a good selection of development tools, the ecosystem is still maturing. Some tools may have limited functionality, documentation, or community support compared to more established programming languages.
  • 5. Gas Costs: Solidity contracts need to pay for their execution using a cryptocurrency called Ether. The cost of executing transactions and smart contracts can vary depending on network congestion and the complexity of the contract, which can affect the overall cost of running DApps.
  • 6. Lack of Privacy: Solidity is primarily designed for building decentralized applications on public blockchains like Ethereum, which are transparent and open to anyone. It may not be the best choice for applications that require strict data privacy or confidentiality.
  • 7. Scalability Challenges: Solidity contracts run on the Ethereum Virtual Machine (EVM), which has scalability limitations. As the number of users and transactions on the Ethereum network grows, it can lead to congestion and higher gas costs.
  • 8. Code Immobility: Once a Solidity contract is deployed on the blockchain, it becomes immutable and cannot be changed. While upgradability patterns exist, they add complexity and potential security risks.
  • 9. Regulatory Uncertainty: The legal and regulatory landscape for blockchain and smart contracts is still evolving. Developers using Solidity need to be aware of and comply with applicable laws and regulations, which can vary across jurisdictions.

Hard skills of a Solidity Developer

As a Solidity Developer, you need a specific set of hard skills to excel in your role. Here are the key hard skills required for Solidity Developers at different levels of experience:


  • Ethereum Development: Proficient in Ethereum blockchain development and the Solidity programming language.
  • Smart Contract Development: Ability to write, test, and deploy smart contracts on the Ethereum platform.
  • Blockchain Security: Familiarity with best practices for securing smart contracts and preventing vulnerabilities.
  • Web3.js: Knowledge of the Web3.js library for interacting with smart contracts and the Ethereum network.
  • Version Control: Proficient in using Git for version control and collaboration with other developers.


  • Advanced Smart Contract Development: Experience in designing and implementing complex smart contract systems.
  • Decentralized Applications (DApps): Ability to build decentralized applications using Solidity and related technologies.
  • Blockchain Architecture: Understanding of blockchain architecture and its impact on smart contract development.
  • Testing and Debugging: Proficiency in testing and debugging smart contracts to ensure their reliability and security.
  • Scalability and Performance Optimization: Knowledge of techniques to optimize smart contracts for scalability and performance.
  • Security Auditing: Ability to perform security audits on smart contracts to identify and mitigate potential vulnerabilities.
  • DevOps Skills: Familiarity with DevOps practices for continuous integration and deployment of smart contracts.


  • Protocol Development: Experience in contributing to the development of blockchain protocols and standards.
  • Governance and Consensus Mechanisms: Understanding of blockchain governance models and consensus mechanisms.
  • Cryptographic Concepts: Knowledge of cryptographic concepts and their application in blockchain systems.
  • Code Review and Mentorship: Ability to review code and provide guidance and mentorship to junior developers.
  • Performance Optimization: Expertise in optimizing smart contracts for maximum performance and efficiency.
  • Research and Development: Ability to stay updated with the latest advancements in blockchain technology and contribute to research and development efforts.
  • Leadership Skills: Strong leadership skills to guide and mentor a team of developers.
  • Project Management: Proficient in project management methodologies to ensure successful delivery of blockchain projects.

Expert/Team Lead

  • Blockchain Architecture Design: Expertise in designing scalable and secure blockchain architectures.
  • Formal Verification: Knowledge of formal verification techniques to ensure the correctness of smart contracts.
  • Economic Models: Understanding of economic models and incentive mechanisms in blockchain ecosystems.
  • Cross-Chain Interoperability: Experience in building solutions for interoperability between different blockchain networks.
  • Penetration Testing: Ability to conduct penetration testing to identify and address security vulnerabilities in blockchain systems.
  • Strategic Planning: Ability to develop and execute strategic plans for blockchain projects.
  • Technical Leadership: Strong technical leadership skills to guide and mentor a team of developers.
  • Industry Knowledge: Deep understanding of the blockchain industry, its trends, and emerging technologies.
  • Communication and Collaboration: Excellent communication and collaboration skills to work effectively with cross-functional teams.
  • Business Acumen: Ability to align technical decisions with business goals and requirements.
  • Regulatory Compliance: Knowledge of regulatory frameworks and compliance requirements in the blockchain space.

TOP 10 Tech facts and history of creation and versions about Solidity Development

  • Solidity is a high-level programming language used for writing smart contracts on the Ethereum blockchain. It was created in 2014 by Gavin Wood, one of the co-founders of Ethereum.
  • The language was influenced by JavaScript, C++, and Python, making it familiar to developers with experience in these languages.
  • Solidity follows an object-oriented programming (OOP) style, allowing developers to define contracts, create objects, and implement inheritance and polymorphism.
  • One of the groundbreaking features of Solidity is its ability to support contract-oriented programming. This means that developers can define and interact with smart contracts, which encapsulate the rules and logic of an application.
  • The first stable version of Solidity, version 0.1.0, was released in August 2015. Since then, the language has undergone several updates and improvements.
  • Solidity is designed to be secure, but it is also known for its complexity. Writing secure smart contracts requires careful consideration of potential vulnerabilities, such as reentrancy attacks and integer overflow/underflow.
  • Smart contracts written in Solidity can be compiled into bytecode, which is then executed by the Ethereum Virtual Machine (EVM). This allows the contracts to run on the Ethereum blockchain.
  • Multiple tools and frameworks have been developed to support Solidity development, including the Truffle suite, Remix IDE, and Hardhat.
  • Solidity has gained popularity due to its role in enabling the creation of decentralized applications (DApps) and facilitating tokenization through Initial Coin Offerings (ICOs).
  • As of September 2021, the latest stable version of Solidity is 0.8.7, which includes new features and improvements for developers.

TOP 10 Solidity Related Technologies

  • 1. Solidity

    Solidity is the most fundamental and widely used programming language for developing smart contracts on the Ethereum blockchain. It is specifically designed for writing secure and efficient code. Solidity supports features such as inheritance, libraries, and complex user-defined types, making it a powerful choice for Ethereum-based decentralized applications (dApps).

  • 2. Truffle

    Truffle is a popular development framework for building, testing, and deploying smart contracts. It provides a suite of tools that streamline the development process, including a built-in testing framework, automated contract compilation and deployment, and simplified contract management. Truffle also integrates with other Ethereum development tools and frameworks, making it a versatile choice for Solidity software development.

  • 3. Remix

    Remix is a web-based IDE (Integrated Development Environment) specifically designed for Solidity development. It offers features such as code editing, debugging, and deployment of smart contracts directly from the browser. Remix provides a user-friendly interface and real-time code compilation, making it an excellent choice for beginners and experienced developers alike.

  • 4. Web3.js

    Web3.js is a JavaScript library that allows developers to interact with the Ethereum blockchain and smart contracts. It provides a set of APIs for sending transactions, reading contract data, and managing accounts. Web3.js simplifies the process of integrating Ethereum functionality into web applications, making it an essential tool for Solidity software development.

  • 5. Ganache

    Ganache is a personal Ethereum blockchain that developers can use for local development and testing of smart contracts. It provides a simulated blockchain environment with customizable accounts, gas limits, and network configurations. Ganache allows developers to test their Solidity code in a sandboxed environment before deploying it to the live Ethereum network.

  • 6. OpenZeppelin

    OpenZeppelin is a library of reusable and secure smart contracts for Ethereum development. It provides pre-audited and community-reviewed contracts that developers can use as building blocks for their own applications. OpenZeppelin covers a wide range of functionalities such as token standards (ERC20, ERC721), access control, and contract upgradability, saving developers time and ensuring code security.

  • 7. Infura

    Infura is a scalable and reliable API infrastructure that allows developers to connect their applications to the Ethereum network without running their own Ethereum nodes. It provides easy-to-use APIs for interacting with smart contracts, retrieving blockchain data, and broadcasting transactions. Infura eliminates the need for developers to manage the complexities of running and maintaining an Ethereum node, making it a valuable tool for Solidity software development.

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