Blockchain Developer

Role Overview

We're seeking a MERN Stack Developer with experience in Web3 development to join our team. The ideal candidate will be comfortable building full-stack applications, integrating smart contracts, and working in a fast-paced startup environment.

Responsibilities

• Develop and maintain full-stack applications using MongoDB, Express.js, React.js, and Node.js
• Integrate smart contracts and blockchain functionality using Web3.js, Ethers.js, or similar libraries
• Collaborate with product managers, designers, and blockchain engineers
• Write clean, maintainable, and testable code
• Troubleshoot and debug applications
• Stay updated with the latest Web3 trends and technologies

Requirements

• 1+ year of hands-on experience with the MERN stack
• Basic to intermediate knowledge of smart contracts, Ethereum, and Web3.js/Ethers.js
• Familiarity with Solidity and Ethereum development tools (e.g., Truffle, Hardhat)
• Understanding of REST APIs and integration practices
• Strong problem-solving skills and a proactive attitude
• Good communication and collaboration skills

Bonus Skills

• Experience with IPFS, The Graph, or Layer 2 solutions
• Contributions to open-source Web3 projects
• Knowledge of NFT standards or DeFi protocols

What We Offer

• Competitive salary and performance-based incentives
• Flexible working hours and remote-friendly culture
• Opportunity to work on cutting-edge Web3 projects
• A collaborative, supportive, and innovative environment

Who we are

CoinCROWD is building the future of crypto spending with CROWD Wallet, a secure, user- friendly wallet designed for seamless cryptocurrency transactions in the real world. As the crypto landscape continues to evolve, CoinCROWD is at the forefront, enabling everyday consumers to use digital currencies like never before.

We’re not just another blockchain startup—we’re a team of innovators, dreamers, and tech geeks who believe in making crypto fun, easy, and accessible to everyone. If you love solving complex problems and cracking blockchain puzzles while sharing memes with your team, you’ll fit right in!

What you’ll be doing

As a key member of our engineering team, you will be responsible for designing, developing, and maintaining robust, scalable, and high-performance backend systems that support CoinCrowd’s

innovative products.

You will be responsible for...

• Designing and implementing blockchain-based applications using QuickNode, Web3Auth, and Python or Node.js.

• Developing and maintaining smart contracts and decentralized applications (dApps) with a focus on security and scalability.

• Integrating blockchain solutions with CROWD Wallet and other financial systems.

• Collaborating with frontend developers, product managers, and other stakeholders to deliver seamless crypto transactions.

• Ensuring high availability and performance of blockchain infrastructure.

• Managing on-chain and off-chain data synchronization.

• Researching and implementing emerging blockchain technologies to improve CoinCROWD’s ecosystem.

• Troubleshooting and resolving blockchain-related issues in a timely manner.

• Ensuring compliance with blockchain security best practices and industry regulations.

• Contributing to architectural decisions and best practices for blockchain development.

What we need from you

We're looking for dynamic, self-motivated individuals who are excited about shaping the future of crypto spending;

• This will be a Full-time role.

• May require occasional travel for conferences or team meetups (Yes, we love those!).

• Bonus points if you can beat our CTO in a game of chess or share an awesome crypto meme!

• Location - WFH initially

What skills & experience you’ll bring to us

• 3 to 10 years of experience in software development, with at least 3+ years in blockchain development.

• Strong knowledge of QuickNode and Web3Auth for blockchain infrastructure and authentication.

• Proficiency in Python or Node.js for backend development.

• Experience in developing, deploying, and auditing smart contracts (Solidity, Rust, orequivalent).

• Hands-on experience with Ethereum, Polygon, or other EVM-compatible blockchains.

• Familiarity with DeFi protocols, NFT standards (ERC-721, ERC-1155), and Web3.js/ Ethers.js.

• Understanding of blockchain security best practices and cryptographic principles.

• Experience working with RESTful APIs, GraphQL, and microservices architecture.

• Strong problem-solving skills and ability to work in a fast-paced startup environment.

• Excellent communication skills and ability to collaborate effectively with cross-functional teams.

Min Exp – 4 years

Location – Dwarka, Delhi

Immediate joiners are preferred

About the company – We are a web development and digital marketing company in Delhi, India. We have been serving our clients globally since 2012. We offer quality assured and revenue driven digital services at affordable rate.

Role summary - We seek an experienced Web3 Developer to join our team and help us build and maintain our Ecosystem based on blockchain. Our platform is built using React for the front end, Node.js, TypeScript, MongoDB for the backend, and Solidity for smart contracts. Someone passionate about blockchain technology and with a strong understanding of the Web3 ecosystem.

Responsibilities:

1. Blockchain Solution Design:

• Collaborate with stakeholders to understand business requirements and identify areas where blockchain technology can add value.
• Design and architect blockchain solutions, including selecting appropriate blockchain platforms, consensus mechanisms, data structures, and smart contract frameworks.
• Develop technical specifications, system architectures, and integration strategies for blockchain-based applications.
• Ensure blockchain solutions align with industry best practices, security standards, and compliance requirements.

2. Blockchain Development:

• Lead the development and implementation of blockchain applications, smart contracts, and decentralized protocols.
• Design and implement APIs and integration points for seamless interaction between blockchain and existing enterprise systems.
• Conduct thorough testing and debugging to ensure blockchain solutions' performance, security, and reliability.
• Collaborate with development teams to define blockchain development coding standards and best practices.

3. Security and Privacy:

• Implement robust security measures, encryption techniques, and access controls to protect blockchain data and transactions.
• Address privacy concerns and design solutions that ensure the confidentiality of sensitive information while maintaining transparency.
• Stay up-to-date with the latest security vulnerabilities and recommend strategies to mitigate risks in blockchain implementations.

4. Scalability and Performance Optimization:

• Optimize blockchain solutions to enhance scalability, transaction throughput, and system performance.
• Evaluate and implement scaling solutions, such as sharding, sidechains, or layer 2 protocols, to address the limitations of blockchain platforms.
• Conduct load testing and performance tuning to identify bottlenecks and optimize resource utilization.

5. Blockchain Governance and Consensus:

• Define governance models and consensus mechanisms suitable for specific use cases and industry requirements.
• Assess and recommend appropriate consensus algorithms, such as Proof of Work (PoW), Proof of Stake (PoS), or Practical Byzantine Fault Tolerance (PBFT), based on the project's needs.
• Establish protocols for transaction validation, block verification, and network participation.

6. Research and Innovation:

• Stay updated with the latest advancements and emerging trends in blockchain technology.
• Conduct research and experimentation to explore the potential of new blockchain platforms, protocols, and tools.
• Evaluate and recommend third-party blockchain solutions, frameworks, and libraries to accelerate development processes.

7. Collaboration and Leadership:

• Collaborate with cross-functional teams, including developers, engineers, product managers, and business stakeholders, to align technical requirements with business goals.
• Provide technical guidance and mentorship to development teams regarding blockchain technologies, best practices, and coding standards.
• Act as a subject matter expert, delivering presentations and training sessions on blockchain concepts and solutions.

Qualifications and Skills:

• Bachelor's or Master's degree in Computer Science, Information Technology, or a related field.
• Extensive experience in blockchain development and architecture, with a deep understanding of blockchain concepts, protocols, and platforms (such as Ethereum, Hyperledger Fabric, Corda, etc.).
• Proficiency in programming languages commonly used in blockchain development, such as Solidity, Go, or Java.
• Strong knowledge of smart contracts, decentralized applications (DApps), and blockchain development frameworks.
• Familiarity with cryptographic principles, encryption algorithms, and security best practices in the context of blockchain.
• Experience with cloud platforms and infrastructure (such as AWS, Azure, or Google Cloud) for deploying and managing blockchain networks.
• Understanding of decentralized storage, identity management, and tokenization concepts.
• Excellent problem-solving and analytical skills, with the ability to architect complex and scalable blockchain solutions.
• Strong communication and leadership skills to collaborate effectively with multidisciplinary teams and drive successful project outcomes.

Job Position - BlockChain Developer

Experience - 4+ Years

Job Location - Bangalore

Responsibilities:

• Search, design, develop, and test blockchain technologies.

• Brainstorm and help evaluate applications for new tools and technologies as they continually evolve.

• Maintain and extend current client- and server-side applications responsible for integration and business logic.

• Be involved in the global blockchain community—work on implementing and integrating the latest improvement proposals.

• Document new solutions as well as maintain the existing ones.

Requirements:

• Total 4+ Years of experience in Backend Development and minimum 1+ years of experience in Ethereum, Blockchain

• Knowledge of any one of the programming languages: NodeJS, Java, GoLang, C, C++, PHP

• Basic understanding of blockchain technology: Bitcoin, Smart Contracts, Solidity, Cryptography

• Knowledge of private blockchains such as Hyper Ledger, and Corda is a plus

• Basic understanding of HTML, CSS, JS, Bootstrap, and knowledge of front-end technologies such as Angular/ React/ Vue is a plus.

• Knowledge in databases and database modeling: MySQL, PostgreSQL, MongoDB

• Understanding of Software Development Lifecycle (SDLC)

• Experience using Git for version control

1. Min 3 yrs of experience in Software Development
2. 2+ yrs of experience in Blockchain & Hyperledger experience is a must
3. Good experience with Microservices, Docker, Kubernetes, Devops, and Cloud Technologies.
4. Experience with Java / Golang / Python / Nodejs / ROR / C# or any OO Language.
5. Nice to have CHFA or CHFD certifications 

We are looking for a Blockchain Developer who has around 2-3 years of experience, and has past experience with working on blockchain-based systems and scenarios. The ideal candidate would be someone who understands the concepts of Blockchain technology and having working experience on Rust and Solana.

• Desire to work in a startup environment, fun@work culture and able to self-manage.

• In Depth understanding of at-least two blockchain network like Rust, Substrate, Polkadot Solana, Hedera Hashgraph, Tezos, BlockApps, Algorand, Corda, Lambda, Cargo etc

• Familiarity with basic cryptography to understand the essentials of blockchain systems.

• Hands on in Rust

• Designing and writing well-structured APIs in Node.js and MongoDb to connect to Blockchain infrastructure

• Staying up to date with new developments and news in integrated chains.

• Past experience with Wallets or Crypto Exchanges would be a major plus.

• Experience with third-party libraries and APIs.

• Experience working in an agile development process.

• Documenting architecture and guidelines.

• Be proficient in using version control and continuous integration, with tools such as Gitlab, Git and Jenkins.

• Write clear, maintainable and testable code that you are proud of.

• Attend training and education where necessary to up-skill themselves.

• Experience in writing smart contracts for large-scale production blockchain applications.

• Cross-team contribution whenever required.

• Familiarity with basic cryptography.

• Should have a deep understanding of the blockchain and cryptocurrency space and smart contract systems, specifically having a deep understanding of Rust.