Smart Contract Engineer (Solidity)
Team Overview:
Join our close-knit team within the DeFi sector of OKX, where we focus on pioneering on-chain solutions to enhance the OKX experience for our users. We specialize in bolstering DeFi protocols, crafting inventive DeFi remedies, and identifying growth possibilities in the DeFi realm. Our ongoing projects encompass exciting innovations like lending/borrowing optimization tools and AA wallets. We are on the lookout for dynamic individuals who possess a forward-thinking and creative approach, a genuine enthusiasm for DeFi, and the capability to overcome challenges with effective resolutions. If you are passionate about DeFi and eager to exhibit your skills in a dynamic and imaginative setting, we invite you to be part of our team. Let's work together to shape a better tomorrow.
Job Duties
Plan, create, test, and refine smart contracts on platforms like Ethereum or other established blockchain networks.
Delve into thorough research on diverse DeFi protocols, finalize integration documents, and cooperate with team members to facilitate project launches.
Stay updated on emerging technologies and trends in Web3, engage in product strategizing, and support product rollouts.
Requirements
Hold a Bachelor's degree in Computer Science, Software Engineering, or a related field, or possess equivalent practical experience.
Minimum of 1 year involved in smart contract development, adept in Solidity, and familiar with contract development frameworks like Hardhat, Foundry, among others.
Possess a comprehensive understanding of blockchain technology, encompassing Ethereum, Bitcoin, Solana, and L2 networks.
Acquainted with Assembly and skilled in Gas optimization.
Excellent problem-solving skills, analytical mindset, effective communication, and teamwork proficiency.
Demonstrate a keen interest in blockchain technology and exhibit the readiness to continuously educate oneself on the latest technologies, protocols, and relevant domains.
Preferred Qualifications
Background knowledge in finance, as well as experience in designing or developing DeFi protocols.
Familiarity with contract security and insights into common blockchain attacks.
Deep exploration of diverse DeFi protocols, understanding their functionalities and economic frameworks, such as Uniswap, AAVE, Compound, Synthetix, and others.
Proficiency in English and prior experience working in decentralized projects within international teams or English-speaking environments.
Familiarity with additional contract development languages like Rust, Move, as well as scripting languages such as Python or JS.
Mobile Developer
We are looking for a Mobile Developer to help build and optimize the mobile experience for the platform. You will work closely with our product, backend, and design teams to create a performant, secure, and intuitive mobile app that supports real-time 3D property viewing, blockchain interactions, and AI-powered recommendations.
Responsibilities :
Develop and maintain cross-platform mobile applications (iOS and Android)
Integrate with backend APIs and smart contracts (Web3)
Optimize app performance, responsiveness, and security
Collaborate with UI/UX designers to implement immersive and intuitive experiences
Integrate 3D content using tools like Unity, Babylon.js, or Three.js (if mobile-compatible)
Enable wallet connections (e.g., WalletConnect)
Implement features such as property listings, profiles, payments, notifications, etc.
Conduct testing and debugging across multiple devices and OS versions
Participate in code reviews and Agile sprints
Requirements :
5+ years of mobile development experience
Strong proficiency with React Native (preferred) or Flutter
Experience integrating RESTful APIs and Web3 tools (e.g., Ethers.js, WalletConnect)
Familiarity with blockchain wallets and decentralized identity concepts
Basic understanding of React and front-end development
Experience with Firebase, Push Notifications, and payment SDKs
Ability to work with 3D content or ARKit/ARCore is a plus
Experience publishing and maintaining apps in App Store and Google Play
Strong problem-solving and debugging skills
Excellent communication and collaboration in a remote team environment
AI/ML Engineer
We are looking for an experienced AI/ML Engineer to join our team and drive the development of intelligent systems that enhance user personalization, property recommendations, pricing models, and more. You will work across disciplines with frontend, backend, and blockchain engineers to create and deploy real-world AI features in a decentralized ecosystem.
Responsibilities :
Build and deploy machine learning models for property recommendations, price prediction, and user engagement optimization.
Integrate LightFM, LangChain, and OpenAI/LLM frameworks.
Design AI-powered agents, chatbots, and virtual assistants.
Collaborate on feature engineering, data pipelines, and AI service APIs.
Work with frontend developers to display predictive results and recommendations in the UI.
Deploy models using AWS SageMaker or similar infrastructure.
Monitor model performance and continuously improve accuracy and efficiency.
Stay up to date with advancements in GenAI, real estate AI, and MLOps best practices.
Requirements :
5+ years of hands-on AI/ML development experience.
Strong Python skills with frameworks like NumPy, Pandas, Scikit-learn, TensorFlow, or PyTorch.
Experience with recommender systems (e.g., LightFM), NLP, or conversational AI (LangChain).
Familiar with deploying models in cloud environments (preferably AWS SageMaker).
Working knowledge of React and frontend integration basics.
Solid understanding of data preparation, model tuning, and deployment workflows.
Strong problem-solving ability and self-management skills.
Smart Contract & Web3 Developer
We are looking for an experienced Smart Contract & Web3 Developer to join our team. This role is central to the design, development, and deployment of secure and scalable blockchain-based solutions. You will work closely with frontend and backend developers, designers, and product managers to integrate smart contracts into a seamless and immersive user experience for real estate investment and trading.
Responsibilities :
Design, develop, and deploy secure smart contracts on Ethereum or compatible EVM chains (e.g., Polygon).
Build and test tokenization logic for real estate assets using NFTs and ERC standards (e.g., ERC-721, ERC-1155).
Integrate Web3.js/Ethers.js with the frontend (React) and backend services.
Collaborate with designers and frontend developers to enable blockchain-powered UX flows (e.g., wallet login, transactions).
Implement features such as fractional ownership, DAO voting, and rental agreements.
Write unit tests and perform contract audits to ensure security and efficiency.
Manage smart contract deployments and monitor their on-chain performance.
Stay updated on Web3 trends, L2 solutions, and relevant protocols that can enhance the platform.
Requirements :
3-5 years of experience in smart contract development and blockchain technology.
Strong knowledge of Solidity and smart contract best practices.
Familiarity with Ethereum, Polygon, or other EVM-compatible chains.
Experience with Web3 libraries (Web3.js, Ethers.js) and frontend integration.
Basic understanding of frontend development using React and TypeScript.
Experience deploying contracts using tools like Hardhat or Foundry.
Understanding of decentralized storage solutions like IPFS.
Comfort with using blockchain APIs (Alchemy, Infura) and node management.
Good communication skills and ability to collaborate in a cross-functional team.
Engineering Manager
We are looking for an Engineering Manager to lead our distributed engineering team. In this role, you will guide a cross-functional team of developers (frontend, backend, Web3, AI/ML, mobile, QA), ensuring technical excellence, timely delivery, and alignment with product goals. The Engineering Manager will serve as both a technical leader and a people manager, fostering innovation and accountability across the team
Responsibilities :
Lead and manage a team of software engineers (frontend, backend, Web3, AI/ML, mobile, QA)
Define and maintain engineering best practices, coding standards, and architecture guidelines
Collaborate with Product Managers and Project Managers to plan and prioritize sprints
Drive the execution of technical projects from design through delivery
Conduct code reviews, mentoring, and skill development for engineers
Ensure scalable, secure, and high-performance systems across the stack
Oversee DevOps practices, CI/CD, and cloud deployments (AWS, Docker, Terraform)
Coordinate with Web3 developers for smart contract integration and audits
Monitor and improve system reliability, performance, and security
Manage hiring, onboarding, and performance evaluations of engineering team members
Requirements :
5+ years of experience as a Software Engineer / Full Stack Developer
2+ years of proven leadership experience as an Engineering Manager / Tech Lead
Strong technical background in React, Node.js, Python/FastAPI, Web3 (Solidity/Ethers.js)
Familiarity with cloud infrastructure (AWS, Docker, Terraform)
Experience with Agile/Scrum methodologies and sprint planning
Excellent problem-solving, communication, and organizational skills
Ability to manage a remote, distributed engineering team effectively
Basic understanding of front-end development (React/JS) is required
Smart Contract Developer
We’re looking for an experienced Smart Contract Developer to join our remote team. You’ll be responsible for designing, developing, and deploying secure and efficient smart contracts for blockchain-based applications. The role involves close collaboration with other developers and product leads to bring new ideas to life.
Key Responsibilities:
- Design, write, and test smart contracts (Solidity)
- Review and optimize existing contracts for gas efficiency and security
- Integrate contracts with front-end or backend services via Web3
- Participate in code reviews, audits, and documentation
- Stay current with blockchain trends and best practices
Requirements:
- Proven experience with Solidity, EVM-based blockchains, and related frameworks (Hardhat, Truffle, Foundry, etc.)
- Good understanding of DeFi protocols, NFT standards (ERC-721/1155), or Layer-2 solutions
- Familiarity with smart contract security and testing methodologies
- Experience using GitLab, Git, and version control workflows
- Ability to work independently and communicate effectively in English
Nice to Have:
- Background in cryptography, auditing, or backend development
- Contributions to open-source blockchain projects
What We Offer:
- Fully remote and flexible working hours (team across EST, CET, GMT+2)
- Flexible payment options — including crypto payments (USDT, USDC) or traditional methods
- Collaborative and friendly international team
- Opportunities to grow into lead or architecture roles