Title: Smart Contract Developer
Quick Summary
Keystone Protocols is recruiting a Smart Contract Developer to design, implement, and harden production smart contracts and the services around them. The role focuses on safe, gas-efficient code, comprehensive testing, and crisp documentation that enables predictable mainnet releases. You will partner closely with product managers, designers, and security engineers to turn requirements into well-specified protocols that are simple to integrate and maintain.
Project Category or Industry
Web3 products with emphasis on decentralized finance and consumer on-chain experiences
Type
Full-time employment
Experience Level
Entry to mid-level. We provide structured mentorship for motivated graduates with strong fundamentals, open-source contributions, or hackathon projects, while encouraging experienced developers to lead by example.
Duration
Permanent role
Location
Remote-first across the Americas, EMEA, and APAC with at least four hours of overlap between 09:00 and 18:00 UTC; optional hub days in Lisbon and Singapore
Salary
USD 85,000 to 145,000 base depending on location and experience, plus annual bonus eligibility and optional equity or token grants where allowed by local regulation
Payment Mode
Monthly payroll by bank transfer; contractor arrangements available in regions where local employment is not supported
Hiring Company Name
Keystone Protocols
Required Skills or Tools
You bring solid programming fundamentals, a security-first mindset, and familiarity with smart contract development in Solidity or Rust. You are comfortable writing exhaustive tests, optimizing for gas and readability, and explaining trade-offs to both engineers and non-engineers. Curiosity, precise written communication, and ownership are essential.
Project Details
Project Description
You will build and evolve the contracts and supporting components that power Keystone’s core protocol features. Typical work includes token and treasury flows, upgradeable modules with strict access boundaries, allowlists and permits, cross-chain interactions, and integration paths for wallets and partners. The goal is to deliver secure-by-default contracts with clear specifications, predictable deployment procedures, and robust monitoring so that new features can move from idea to mainnet with confidence.
Core Responsibilities and Expected Deliverables
Implement production-grade smart contracts with clear interfaces, events, and role-based access control, optimized for gas and maintainability.
Author unit, integration, invariant, and fuzz tests; define negative cases and measurable acceptance criteria.
Build deployment and migration scripts with verification steps, upgrade playbooks, and emergency controls with time-boxed timelocks where appropriate.
Collaborate with security on threat models, static analysis, and remediation plans; coordinate external audits and manage bug bounty intake.
Integrate on-chain components with indexers, relayers, and partner SDKs; provide sample integrations and reference clients.
Produce concise documentation including protocol specifications, risk notes, changelogs, and runbooks for operations and incident response.
Required Experience and Preferred Qualifications
Strong understanding of data structures, algorithms, and common Web3 pitfalls such as reentrancy, unchecked external calls, signature misuse, integer overflow, and storage layout errors.
Demonstrated portfolio such as open-source pull requests, testnet deployments, or hackathon submissions with tests and rationale.
Preferred experience with upgrade patterns such as UUPS, role-based permissions, permit flows aligned to EIP-2612, typed data aligned to EIP-712, meta-transactions, and gas profiling.
Familiarity with on-chain incentive design, fee accounting, and simple economic analysis.
Industry certifications are valued but not required.
Tools or Platforms to Be Used
EVM stack: Solidity, Foundry, Hardhat, OpenZeppelin libraries, Slither and Echidna for analysis and fuzzing, Mythril for symbolic checks, Tenderly or comparable simulators for tracing
Rust and Solana as applicable: Rust, Anchor framework, local validator with Anchor tests
Indexing and off-chain services: The Graph or Subsquid, lightweight relayers or cloud functions, wallet integrations through WalletConnect
Collaboration and delivery: GitHub for reviews, GitHub Actions for continuous integration, Notion for specifications, and Jira for tracking
Language Requirement
English is required for daily collaboration; additional languages are a plus.
Communication Style
Asynchronous-first through Slack and GitHub with weekly Zoom stand-ups, design reviews, and security roundtables. Architecture decisions are captured as short RFCs with clear rationale and risk sections.
Time Commitment or Working Window
Approximately forty hours per week with flexible scheduling; planned mainnet releases may require brief, scheduled overlaps outside core hours with compensatory time.
Payment Terms
Monthly salary with annual performance review and bonus eligibility. For contractors, milestone-based deliverables with biweekly invoicing on net-fifteen terms.
Evaluation Criteria
Candidates are assessed on a short coding exercise that implements a safe, testable contract with invariants and gas considerations, a portfolio review of public or shared repositories, a live pairing session focused on threat modeling and remediation, communication clarity during interviews, and references confirming reliability and ownership.
Other Requirements
A standard NDA upon offer acceptance, identity verification, and reference checks consistent with local laws. Onboarding includes security, privacy, and key management training, along with guidelines for responsible disclosure. Light-touch time tracking applies to contractor engagements.
About the Company
Keystone Protocols is a remote-first product and protocol studio focused on shipping trustworthy, human-centered Web3 experiences. Founded in 2020, we combine security-first engineering with pragmatic product thinking to build protocols people actually use. Our teams operate across Europe and Asia with collaboration hubs in Lisbon and Singapore. Learn more at https://keystoneprotocols.com or contact careers@keystoneprotocols.com.