14 Hardhat Jobs

As a Blockchain Engineer, you will be responsible for developing secure, scalable, and high-performance decentralized applications. Your primary focus will be on utilizing key technologies such as Node.js, Rust, Go, TypeScript, Ethers.js, viem, and Hardhat in smart contract and blockchain system development. You will be tackling practical challenges that arise during the development of such projects. Your tasks will include integrating Node.js, Rust, Go, and TypeScript into blockchain-backed applications. It will be crucial for you to discuss the trade-offs between using Rust or Go for performance-critical blockchain services. You will also need to address key challenges related to ensuring the security and scalability of smart contracts using tools like Ethers.js, viem, and Hardhat. In addition, you will be responsible for testing, debugging, and deploying smart contracts in a decentralized environment. Sharing best practices for gas optimization, contract upgradability, and backend scalability will also be part of your role. Your performance will be evaluated based on various criteria. Firstly, your technical knowledge should include a strong understanding of Node.js, Rust, Go, and TypeScript along with practical experience in blockchain development. You should also be proficient in Ethers.js, viem, Hardhat, and the smart contract lifecycle. Problem-solving and integration skills are crucial for this role. You will need to demonstrate how you approach integrating smart contract solutions with backend services and propose solutions for common challenges in blockchain projects. Candidates with a minimum of 2 years of IT experience, including hands-on development with the specified technologies, will be preferred. Practical knowledge of blockchain architecture, consensus mechanisms, and decentralized application deployment is also required. Your ability to think innovatively and critically about system architecture will be assessed. You should be able to propose scalable and secure solutions for blockchain-based applications and discuss the future potential of blockchain technology and how the tech stack can evolve. Communication and team collaboration skills are essential. You should be able to clearly articulate technical challenges and collaborate effectively within a team setting. Your ability to lead or contribute to discussions in a collaborative manner will be evaluated.,

As a Blockchain Developer at SynRam Software Services Pvt Ltd, you will play a crucial role in designing, implementing, and supporting blockchain-based solutions. Your responsibilities will include developing applications and smart contracts, maintaining blockchain platforms, integrating blockchain technology into existing applications, and ensuring the scalability and security of our blockchain infrastructure. You will collaborate with cross-functional teams to define and implement new features, write and test code for blockchain applications using languages like Solidity, Rust, Go, or JavaScript, and stay updated on blockchain trends, tools, and best practices. Conducting code reviews, troubleshooting, and optimizing performance and security issues will also be part of your role. To qualify for this position, you should have a Bachelor's degree in Computer Science or a related field, along with proven experience as a Blockchain Developer. Proficiency in blockchain platforms, smart contract development, and programming languages like Solidity, Rust, or Python is essential. Experience with Ethereum, Bitcoin, Hyperledger, and familiarity with cryptography, decentralized applications (dApps), and web3 technology are required. Preferred qualifications include experience with tokenomics, ICO/IDO project development, security best practices for blockchain development, and knowledge of database management integration with blockchain technology. Strong analytical, problem-solving, and communication skills are crucial for success in this role. Join us at SynRam Software Services Pvt Ltd for a competitive salary and benefits package, opportunities to work on cutting-edge technology, a collaborative team culture, and growth prospects. If you are passionate about decentralized technology and possess the required skills, share your resume with us at career@synram.co or contact us at +91-9111381555 to explore this exciting opportunity. This is a full-time, permanent position at our office in Gwalior, Madhya Pradesh, with benefits including a flexible schedule, health insurance, and paid time off. We are looking for candidates with a minimum of 2 years of experience as a Blockchain Developer, a strong command of English, and the ability to work in a fast-paced, collaborative environment. If you are ready to shape the future of decentralized technology, we encourage you to apply and be part of our innovative team.,

To design, develop, and deploy decentralized applications (dApps) and smart contracts on the Ethereum blockchain. The ETH Developer ensures secure, gas-optimized, and scalable smart contracts that support business logic across Web3 applications. Role & responsibilities Smart Contract Development Write, test, and deploy smart contracts (ERC20, ERC721, ERC1155, etc.) using Solidity 2. dApp Integration Integrate contracts with front-end via Web3.js/Ethers.js 3. Gas Optimization Minimize gas costs for high-usage functions 4. Security Testing Perform formal verification, fuzzing, and unit tests 5. Tooling & Framework Use Leverage Hardhat, Foundry, Truffle, and The Graph 6.L2 & Multichain Deployment Deploy to Arbitrum, Optimism, Polygon, Base, etc. 7. Documentation & Collaboration Document contract architecture, ABIs, and APIs; collaborate across teams Preferred candidate profile 3+ years in Ethereum development (Solidity) Deep understanding of EVM, gas optimization, and token standards Experience in Web3 infrastructure (Infura, Alchemy, Moralis) Prior experience with DAOs, DeFi, or NFT platforms Audit experience with tools like Slither, MythX, or Certora is a plus

As a Blockchain Developer at Aindriya Marketing Solutions Pvt. Ltd., located in Kochi, India, you will be responsible for designing, developing, and deploying smart contracts using Solidity or other blockchain programming languages. Your role will involve building and maintaining decentralized applications (DApps) on platforms such as Ethereum, Binance Smart Chain, or Polygon. You will implement blockchain security best practices to ensure the safety and integrity of transactions, as well as develop and integrate APIs for blockchain interactions. Collaboration with front-end and back-end developers to integrate blockchain functionalities into applications will be a key aspect of your responsibilities. Additionally, you will be involved in conducting code reviews, debugging, and performance optimization, while staying updated with the latest blockchain technologies, protocols, and industry trends. To excel in this role, you should possess a strong knowledge of blockchain fundamentals, cryptography, and decentralized finance (DeFi) concepts. Proficiency in Solidity, Rust, or other blockchain programming languages is essential, along with experience working with Ethereum, Binance Smart Chain, or Hyperledger. Hands-on experience with Web3.js, Ethers.js, Truffle, or Hardhat is required, as well as familiarity with smart contract security and best practices to prevent vulnerabilities. Knowledge of NFTs, DeFi protocols, and token standards (ERC-20, ERC-721, ERC-1155, etc.) will be beneficial, along with an understanding of IPFS, Layer 2 solutions, and cross-chain technologies. Strong problem-solving skills and the ability to work in an agile environment are also important for this role. Preferred skills include experience with React.js, Node.js, or Python for blockchain integration, familiarity with DevOps tools for smart contract deployment, and previous experience contributing to open-source blockchain projects. Experience in developing DeFi applications, DAOs, or NFT marketplaces will be an added advantage. In return, you can expect a competitive salary based on experience and skills, flexible work arrangements including remote/hybrid options, and the opportunity to work on cutting-edge blockchain projects. Skill development and learning opportunities in Web3 and DeFi will also be provided. If you are passionate about blockchain technology and eager to work on innovative projects, we would love to hear from you! This position is available in both full-time and part-time capacities, with benefits including cell phone reimbursement and internet reimbursement. The work location is in person, with a day shift schedule. To apply or learn more about the role, please contact the employer at +91 8089937888.,

We are searching for a skilled Blockchain Developer proficient in Solana (Rust + Anchor) and EVM-compatible chains such as Ethereum, Polygon, Base, BSC. The ideal candidate will excel in smart contract development, cross-chain interoperability, and full-stack dApp creation with React and Web3 integrations. Your responsibilities will involve constructing secure, scalable, and user-focused decentralized applications incorporating seamless wallet and blockchain integrations. As an Immediate Joiner, you will be expected to: - Develop and deploy smart contracts on Solana (Rust + Anchor) and EVM-based networks utilizing Solidity. - Construct full-stack dApps using React.js/Next.js, Web3.js/Ethers.js, and wallet integrations (MetaMask, Phantom, WalletConnect). - Implement cross-chain functionalities like bridging, syncing, wrapped tokens using LayerZero, Wormhole, or Axelar. - Write secure, gas-optimized contracts, and conduct comprehensive testing (Mocha, Jest, Anchor test suite, Hardhat, Foundry). - Integrate backend services involving Node.js, GraphQL/REST APIs, PostgreSQL/MongoDB, and Redis (optional). - Automate deployments utilizing Docker and CI tools (GitHub Actions, GitLab CI). - Monitor and troubleshoot on-chain activity with tools like Tenderly, Etherscan APIs, and Solana Explorer. - Collaborate with frontend and DevOps teams to ensure excellent UI/UX and scalability. Skills & Experience required: - 3+ years of full-stack development experience. - 1+ year of hands-on Solana smart contract development (Rust + Anchor). - Proficiency in Solidity and EVM tools (Hardhat, Foundry, Truffle). - Strong knowledge of Web3 wallet integration, blockchain architecture, and RPC interactions. - Experience with DeFi, NFTs, DAOs, and decentralized storage (IPFS, Arweave). - Familiarity with authentication protocols like JWT, OAuth2, and SIWE (Sign-In With Ethereum/Solana). - Understanding of smart contract vulnerabilities and Web3 security best practices. - Experience with zk-rollups (zk-SNARKs, zkSync, StarkNet). - Exposure to other chains like Cosmos, NEAR, or React Native/mobile dApps. - Contributions to open-source blockchain projects. - Knowledge of MEV, gas fee estimation, and bridging mechanics across chains.,

As a Blockchain Developer, you will be responsible for developing, deploying, and managing blockchain solutions on various blockchain networks such as Ethereum, Hyperledger, BSC, and others. Your role will involve designing and implementing smart contracts using Solidity and other blockchain programming languages. You will collaborate closely with front-end developers to integrate blockchain services into existing platforms and design and maintain decentralized applications (dApps). Ensuring the security and integrity of the blockchain system will be a key part of your responsibilities. Additionally, you will develop APIs for blockchain-based applications, conduct code reviews, testing, and debugging to ensure high-quality, scalable, and maintainable code, and work on blockchain consensus protocols and off-chain solutions like oracles and sidechains. Staying updated on the latest trends and developments in the blockchain space is also essential. To qualify for this role, you should have a Bachelor's degree in Computer Science, Software Engineering, or a related field, along with 3-5 years of hands-on experience in blockchain development. Proficiency in Solidity, Ethereum, and smart contract development is required, as well as experience with other blockchain technologies such as Hyperledger, Polkadot, or Binance Smart Chain. A strong understanding of cryptography, security principles, and consensus algorithms is important, along with proficiency in at least one programming language like JavaScript, Python, Go, or Rust. Familiarity with Web3.js and Ethereum development tools such as Truffle, Hardhat, or Remix is preferred, and experience with cloud platforms like AWS, Azure, or GCP for blockchain infrastructure deployment is a plus. Knowledge of decentralized finance (DeFi) or non-fungible tokens (NFTs) is also beneficial. Preferred skills for this role include experience with supply chain blockchain solutions, familiarity with IPFS and distributed storage solutions, strong analytical and problem-solving skills, and the ability to work in a fast-paced environment and meet tight deadlines. Excellent communication and teamwork skills are also desired. In return, we offer a competitive salary and benefits package, the opportunity to work on cutting-edge blockchain projects, and professional development opportunities.,

As a skilled Solidity Developer, you will be joining our blockchain engineering team in Kochi, Kerala. Your primary responsibility will be to design, develop, test, and deploy secure and scalable smart contracts for DeFi, NFTs, or Web3 platforms using Solidity on Ethereum-compatible blockchains. Collaborating with frontend/backend teams, you will integrate smart contracts into dApps and optimize them for performance, gas efficiency, and security. Additionally, you will conduct code reviews, audits, and unit testing to ensure reliability while staying updated on the latest Web3 trends, tools, and vulnerabilities. You are required to have a minimum of 2 years of experience in Solidity development along with a deep understanding of Ethereum, EVM, smart contract architecture, and token standards such as ERC-20, ERC-721, ERC-1155. Familiarity with tools like Hardhat, Truffle, Remix, Ganache, web3.js/ethers.js, and integrating smart contracts with frontend/backend is essential. Knowledge of security best practices including reentrancy, overflow, front-running, etc., as well as proficiency in Git and Agile workflows are expected. It would be a plus if you have experience with Layer 2s, sidechains, or cross-chain platforms, familiarity with Rust, Solidity Assembly, or other blockchain protocols, and prior contributions to open-source Web3 projects. As a passionate individual about blockchain and decentralized technologies, you should possess strong problem-solving, analytical skills, and be a clear communicator and team collaborator. In return, we offer a competitive salary, token incentives, a flexible work environment, and the opportunity to work on cutting-edge Web3 products. If you are enthusiastic about decentralized tech and clean, gas-efficient code, we would love to have a conversation with you.,

As a Solidity Developer at our company, you will be a valuable addition to our blockchain engineering team. Your primary responsibility will be to design, develop, test, and deploy secure and scalable smart contracts using Solidity on Ethereum-compatible blockchains. You will play a crucial role in building smart contracts for various applications such as DeFi, NFTs, and Web3 platforms. Your tasks will include optimizing contracts for performance, gas efficiency, and security. You will collaborate closely with the frontend and backend teams to integrate smart contracts into decentralized applications (dApps). Additionally, you will be responsible for conducting code reviews, audits, and unit testing to ensure the reliability of the developed smart contracts. Staying updated on the latest Web3 trends, tools, and vulnerabilities will be essential in this role. To be successful in this position, you should have at least 2 years of experience in Solidity development. A deep understanding of Ethereum, EVM, smart contract architecture, and token standards such as ERC-20, ERC-721, and ERC-1155 is required. Familiarity with tools like Hardhat, Truffle, Remix, and Ganache will also be beneficial. Experience with web3.js/ethers.js and integrating smart contracts with frontend/backend systems is necessary, along with knowledge of security best practices like reentrancy, overflow, and front-running. Proficiency in Git and Agile workflows is expected. It would be a plus if you have experience with Layer 2s, sidechains, or cross-chain platforms. Familiarity with Rust, Solidity Assembly, or other blockchain protocols, as well as prior contributions to open-source Web3 projects, are also advantageous. We are looking for someone who is passionate about blockchain and decentralized technologies, possesses strong problem-solving and analytical skills, and can communicate effectively and collaborate well within a team. In return, we offer a competitive salary, token incentives, a flexible work environment, and the opportunity to work on cutting-edge Web3 products.,

We are seeking a skilled Blockchain Developer with practical experience in Solana (Rust + Anchor) and EVM-compatible chains such as Ethereum, Polygon, Base, BSC. The ideal candidate will possess expertise in smart contract development, cross-chain interoperability, and full-stack dApp development with React and Web3 integrations. Your responsibilities will include developing secure, scalable, and user-centric decentralized applications with seamless wallet and blockchain integrations. As an Immediate Joiner, you will be tasked with developing and deploying smart contracts on Solana (Rust + Anchor) and EVM-based networks using Solidity. Additionally, you will build full-stack dApps utilizing React.js/Next.js, Web3.js/Ethers.js, and integrating wallets like MetaMask, Phantom, and WalletConnect. Implementing cross-chain features using LayerZero, Wormhole, or Axelar for bridging, syncing, and wrapped tokens will also be part of your role. You will be responsible for writing secure, gas-optimized contracts, conducting comprehensive testing using tools like Mocha, Jest, Anchor test suite, Hardhat, and Foundry. Integration of backend services with Node.js, GraphQL/REST APIs, PostgreSQL/MongoDB, and Redis (optional) will also be within your scope. Automation of deployments using Docker and CI tools such as GitHub Actions and GitLab CI is expected. Monitoring and troubleshooting on-chain activity using tools like Tenderly, Etherscan APIs, and Solana Explorer will also be part of your responsibilities. Collaboration with frontend and DevOps teams to ensure excellent UI/UX and scalability is crucial. The desired candidate should possess 3+ years of full-stack development experience, at least 1 year of hands-on Solana smart contract development (Rust + Anchor), proficiency in Solidity and EVM tools (Hardhat, Foundry, Truffle), strong knowledge of Web3 wallet integration, blockchain architecture, and RPC interactions. Experience with DeFi, NFTs, DAOs, and decentralized storage (IPFS, Arweave) is preferred. Familiarity with authentication protocols like JWT, OAuth2, and SIWE (Sign-In With Ethereum/Solana), understanding of smart contract vulnerabilities, and Web3 security best practices are required. Experience with zk-rollups (zk-SNARKs, zkSync, StarkNet), exposure to other chains like Cosmos, NEAR, or React Native/mobile dApps, contributions to open-source blockchain projects, knowledge of MEV, gas fee estimation, and bridging mechanics across chains will be an added advantage.,

As a Blockchain Developer at Aindriya Marketing Solutions Pvt. Ltd., located in Kochi, India, you will be an integral part of our team with a focus on developing cutting-edge blockchain solutions. With at least 2 years of experience in the field, you will play a key role in the design, development, and deployment of decentralized applications, smart contracts, and blockchain integrations. Your responsibilities will include designing and deploying smart contracts using Solidity or other blockchain programming languages, building and maintaining decentralized applications on platforms like Ethereum, Binance Smart Chain, or Polygon, and implementing blockchain security best practices to ensure the safety and integrity of transactions. You will also work on developing and integrating APIs for blockchain interactions, collaborating with front-end and back-end developers, conducting code reviews, debugging, and optimizing performance. To excel in this role, you must possess a strong knowledge of blockchain fundamentals, cryptography, and decentralized finance (DeFi) concepts. Proficiency in Solidity, Rust, or other blockchain programming languages is essential, along with experience working with Ethereum, Binance Smart Chain, or Hyperledger. Hands-on experience with Web3.js, Ethers.js, Truffle, or Hardhat is preferred, as well as familiarity with smart contract security and best practices. Knowledge of NFTs, DeFi protocols, token standards (ERC-20, ERC-721, ERC-1155), IPFS, Layer 2 solutions, and cross-chain technologies will be beneficial. Strong problem-solving skills and the ability to work in an agile environment are also key requirements. Preferred skills for this role include experience with React.js, Node.js, or Python for blockchain integration, familiarity with DevOps tools for smart contract deployment, previous contributions to open-source blockchain projects, and experience in developing DeFi applications, DAOs, or NFT marketplaces. In return, we offer a competitive salary based on your experience and skills, flexible work arrangements including remote and hybrid options, the opportunity to work on cutting-edge blockchain projects, and skill development and learning opportunities in Web3 and DeFi technologies. If you are passionate about blockchain technology and eager to work on innovative projects, we would love to hear from you! Job Types: Full-time, Part-time Benefits: - Cell phone reimbursement - Internet reimbursement Location Type: In-person Schedule: Day shift Experience: blockchain: 1 year (Required) Work Location: In person To speak with the employer, contact: +91 8089937888.,

We're looking for a skilled Smart Contract/Web3 Developer to build secure, efficient decentralized applications (dApps). You'll be responsible for: Designing, developing, testing, and deploying smart contracts. Integrating smart contracts with front-end applications. Ensuring smart contract security and optimization. We require: Proven experience in smart contract development (Solidity/Rust). Strong understanding of blockchain fundamentals. Proficiency with relevant development tools (Hardhat, Truffle, Web3.js/Ethers.js). Nice-to-haves include: Experience with other blockchain platforms, Web3 infrastructure, and front-end frameworks.

We are looking for an enthusiastic and passionate person from the software or education industry to be a part of our Team who can lead the team of students towards a bright future, will educate students in a technological field. You will develop technical training programs and help others develop skills that will make them better professionals. Training Expert must be extremely knowledgeable in his field of expertise and possess solid technical aptitude. Additionally, we expect you to be an excellent communicator, able to explain complex subjects in a clear and interesting way. The goal is to contribute to the development of people's technical/IT skills to meet organizational needs. Key Responsibilities: Training Delivery: Design, develop, and deliver high-quality blockchain training courses, webinars, workshops, and boot camps to learners of varying expertise levels. Topics should cover a broad range of blockchain concepts, including but not limited to blockchain architecture, consensus mechanisms, smart contracts, Ethereum, Polkadot, Solidity, Web3 technologies, and decentralized finance (DeFi). Curriculum Development: Collaborate with the ASB Academy team to develop and update training materials, including presentations, exercises, quizzes, and projects, ensuring content is both relevant and up to date with the latest trends in the blockchain space. Training Management: Organize and manage training sessions, ensuring smooth logistics, content delivery, and learner engagement. Monitor learner progress and provide guidance, feedback, and additional resources as needed. Technical Support: Provide post-training support to students, answer technical queries, and help troubleshoot problems related to blockchain and smart contract development. Industry Engagement: Stay abreast of the latest developments in blockchain technology, Web3, and cryptocurrency to continually refresh and improve training content. Attend and represent Antier Solutions at blockchain conferences, webinars, and events. Assessment & Evaluation: Develop and administer assessments to evaluate learner understanding and performance. Provide constructive feedback to help learners progress in their blockchain education journey. Mentorship: Offer mentorship and career guidance to learners, helping them understand how to apply blockchain concepts in real-world scenarios and guiding them in their professional development. Required Qualifications & Skills: Educational Background: Bachelor's or Masters degree in Computer Science, Information Technology, Engineering, or a related field. Hands-on Blockchain Experience: 3+ years of experience working with blockchain technologies, including Ethereum, Solana, Polkadot, Hyperledger, and/or other decentralized platforms. Proficiency in Solidity, smart contract development, dApp development, and Web3 development. Teaching Experience: At least 2 years of experience in training, teaching, or mentoring individuals or groups, with a proven ability to communicate technical concepts clearly and effectively to both technical and non-technical audiences. Expertise in Blockchain Ecosystem: Strong understanding of blockchain fundamentals, cryptography, consensus mechanisms, decentralized applications (dApps), and smart contract development. Tools & Platforms: Familiarity with blockchain-related tools and platforms like Truffle, Hardhat, Remix, MetaMask, Infura, IPFS, and others. Excellent Communication Skills: Ability to break down complex topics into easy-to-understand modules. Strong verbal and written communication skills are essential for engaging diverse audiences. Passion for Education: A genuine passion for teaching and empowering others to succeed in the blockchain space, with an ability to motivate and inspire learners. Preferred Qualifications: Certification in Blockchain Technology (e.g., Certified Blockchain Developer, Ethereum Developer, etc.) is add on Prior experience in online teaching or course delivery via platforms like Udemy, Coursera, or other learning management systems (LMS) is preferred Experience in building and deploying decentralized applications (dApps) and working with Web3 libraries like Web3.js, ethers.js, etc. Familiarity with tokenomics, NFTs, DeFi, DAOs, and other emerging blockchain use cases.

Key Responsibilities: Designing, developing, and maintaining scalable Web3-enabled full stack applications. Building intuitive frontends with React, Redux, Next.js, and component libraries like Chakra UI or Material UI. Writing secure backend services using Node.js, Typescript, including REST/GraphQL APIs. Designing and deploying cloud-native infrastructure using AWS with microservices architecture. Leading code reviews & architectural discussions Contributing to internal documentation, testing, CI/CD, and DevOps workflows. Requirements: 5+ years of experience in full stack development using TypeScript and JavaScript. Advanced proficiency in React, Next.js, and TypeScript. Experience building and consuming APIs using Node.js, Express, and GraphQL. Cloud infrastructure experience with AWS, GCP. Familiarity with Docker, Kubernetes, and CI/CD best practices. Demonstrable experience in writing secure, well-typed, production-grade TypeScript code. Strong problem-solving skills and ability to work autonomously in a high-growth environment. Preferred Qualification: 2+ years in Web3/blockchain development. Experience with EVM-based smart contracts, solidity, hardhat, foundery, Ether.js / Web3.js Background in DeFi protocols, L1/L2 blockchain development, or traditional finance.

Key Responsibilities Architect, implement, and deploy secure, gas-efficient smart contracts on EVM-compatible chains. Develop and maintain contract systems for token issuance, compliance, permissioned trading, and governance. Write and maintain comprehensive test suites using Hardhat, Foundry, or equivalent frameworks. Review, optimize, and audit smart contracts for security, performance, and reliability. Collaborate with frontend and backend teams to define integration interfaces and transaction flows. Contribute to CI/CD pipelines for contract deployments and versioning. Stay up-to-date on the latest developments in the EVM ecosystem, smart contract standards (e.g., ERC-20, 1400, 3643), and DeFi security best practices. Participate in architecture discussions, threat modelling, and protocol-level design decisions. Requirements 3+ years of experience writing Solidity smart contracts in live, production-grade systems. Deep understanding of Ethereum architecture, EVM internals, and decentralized application patterns. Hands-on experience with Hardhat, Foundry, or similar smart contract development environments. Strong familiarity with cryptographic primitives, token standards, and transaction lifecycle on-chain. Proficient in smart contract testing, mocking, and code coverage strategies. Demonstrated ability to independently lead development and security of complex contract systems. Comfortable working with tools like Ethers.js, Web3.js, and integrating with off-chain services. Preferred Qualification Experience contributing to or auditing DeFi protocols or asset-backed token infrastructure. Knowledge of token compliance frameworks Exposure to account abstraction, identity management, or modular smart contract design. Experience participating in smart contract security reviews and using formal verification tools. Bachelors degree in Computer Science, Engineering, or equivalent experience in cryptography, security, or financial systems.