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Role Overview Job Title: Senior Solidity EngineerLocation: Remote - USA Weâre seeking a highly skilled Solidity Engineer to serve as the lead smart contract developer for Telcoinâs blockchain products. In this role, youâll design, build, and deploy secure and scalable smart contracts that underpin decentralized financial infrastructure. Youâll take ownership of the full development lifecycle, from architecture to production, while working closely with product, compliance, and operations teams. This is a unique opportunity to drive innovation at the core of a global fintech platform.
Who We Are Telcoin is a rapidly growing fintech startup headquartered in Singapore. We leverage blockchain technology to deliver fast, secure, and low-cost financial productsâincluding mobile-based remittances and digital asset solutions. Currently operating in 17+ countries, Telcoin is building a global platform that connects users with modern financial tools through a telecom-integrated approach. Our team includes telecom executives, startup veterans, finance professionals, and world-class engineers. We are now looking for a Senior Solidity Engineer to take ownership of our on-chain architecture and expand the functionality of our blockchain-based financial systems.
What Youâll Be Doing
Own the end-to-end architecture, development, testing, and deployment of smart contracts
Translate business and product requirements into secure, efficient, maintainable on-chain logic
Enhance cross-chain support from Polygon/Ethereum to other blockchains
Optimize contracts for gas efficiency, composability, and long-term maintainability
Conduct rigorous testing (unit, integration, fuzzing) and support third-party security audits
Stay ahead of emerging blockchain vulnerabilities, attack vectors, and security practices
Integrate smart contracts with backend services, APIs, and external partners
Communicate blockchain capabilities and limitations to non-technical teams
Promote best practices and uphold high standards of code quality and documentation
What Weâre Looking For
Bachelorâs or Masterâs degree in Computer Science, Engineering, or related fieldâor equivalent experience
5+ years of professional software engineering experience, with 3+ years in EVM blockchain development
Proven track record of deploying secure, production-grade smart contracts
Expert-level Solidity and EVM knowledge
Strong understanding of token standards, consensus mechanisms, and cryptographic principles
Hands-on experience with frameworks like Foundry, Hardhat, or Truffle
Deep familiarity with smart contract security best practices and vulnerabilities
Ability to take initiative as the lead smart contract developer on projects
Excellent communication skills across technical and non-technical stakeholders
Nice to Have
Experience with stablecoins, DeFi protocols, staking contracts, or bridging infrastructure
Familiarity with Layer 2 solutions, cross-chain protocols, or multi-chain deployments
Contributions to open-source blockchain projects
Awareness of regulatory and compliance considerations in fintech/crypto
What Telcoin Offers
Competitive base salary: $100,000 - $150,000 (depending on experience) + annual bonus and stock option plan
Medical, dental, and vision insurance â 100% employer-sponsored for employee and family
401(k) plan with no waiting period
Unlimited PTO to support work/life balance
Global exposure across fintech and digital assets
Dynamic, entrepreneurial environment with room to grow
What is Truffle Blockchain?
Truffle is a popular development framework for building decentralized applications (dApps) on blockchain platforms, including Ethereum, Binance Smart Chain, and others
The framework provides developers with a suite of tools that make it easier to create, test, and deploy smart contracts and dApps
Truffle also includes a number of integrations with other blockchain development tools and platforms, such as Ganache for local blockchain development and Metamask for Ethereum wallet management
Truffle includes a number of features that simplify the development process, such as:
- Smart contract compilation and migration: Truffle automatically compiles and deploys smart contracts to the blockchain network, making it easier for developers to manage the deployment process.
- Testing framework: Truffle includes a built-in testing framework that enables developers to test their smart contracts and dApps with a variety of testing tools and approaches.
- Debugging and logging: Truffle provides tools for debugging and logging smart contract code, making it easier to diagnose and fix errors and issues during development.
- Built-in libraries: Truffle includes a number of built-in libraries that provide common smart contract functionality, such as OpenZeppelin for token standards and SafeMath for secure arithmetic operations.