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Senior Smart Contract Developer to design, build, test, and maintain smart contract logic that implements core business rules and financial behaviors

Company: S.i. Systems

Location: Toronto, London

Posted: March 23, 2026

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Position Details

Contract: 6 months

Hybrid

Must Haves:

  • Hands-on experience writing and maintaining smart contracts
  • Strong programming skills in:
  • Python (for Vault smart contracts), and/or
  • Solidity or other blockchain contract languages
  • Experience implementing complex business logic in code
  • Strong understanding of:
  • Financial rules and calculations (interest, fees, penalties, limits)
  • Event-driven programming concepts
  • Experience with testing, debugging, and optimizing production-grade code
  • Ability to work closely with technical and non-technical stakeholders

    • Nice to Have

  • Experience with Thought Machine Vault smart contracts
  • Background in financial services, fintech, or payments
  • Familiarity with secure coding practices for smart contracts
  • Exposure to CI/CD pipelines and automated testing frameworks

    • Smart Contract Developer

    Role O...