Smart Contract Developer

Salary: £41,000 - 81,000 per year

Requirements:

• Strong software development experience, preferably Python.
• Hands-on experience with Thought Machine Vault Smart Contracts.
• Experience developing and testing complex financial or business logic.
• Good understanding of banking products and financial calculations.
• Experience with automated testing, TDD, Git, CI/CD, and modern engineering practices.
• Strong analytical, problem-solving, and communication skills.
• Experience working in multidisciplinary Agile teams.
• Strong understanding of Vault Core, including Smart Contracts and Vault APIs.
• Experience with balances and dimensions, scheduled events and hooks, interest accrual/application, and account lifecycle management.
• Experience implementing lending and/or savings products.
• Experience with legacy-to-Vault product migration.
• Experience with interest rates, repayment schedules, fees, overpayments/underpayments, deposits, withdrawals, maturity, and account closure.
• Experience with financial event streams and downstream accounting or reporting.
• Experience with reconciliation between legacy and target banking platforms.
• Experience in UK financial services or other regulated banking environments.
• Experience with microservices, event-driven, and cloud-native architectures.
• Experience with Jira, Confluence, and Agile/Scrum.

Responsibilities:

• Develop and maintain Vault Smart Contracts for Lending and Savings products.
• Translate business requirements into scalable, maintainable product logic.
• Implement interest, accruals, repayments, fees, payment allocation, balances, and lifecycle events.
• Support product migration from legacy systems to Vault.
• Collaborate with Product, Business Analysis, Architecture, and Engineering teams.
• Develop automated tests covering business rules, edge cases, and regression scenarios.
• Participate in code reviews and technical design discussions.
• Investigate defects and support functional, integration, migration, and production testing.
• Validate and reconcile financial calculations between legacy systems and Vault.
• Support releases and produce technical documentation.
• Follow engineering, security, governance, and regulatory standards.

Technologies:

• CI/CD
• Cloud
• Confluence
• Git
• Support
• JIRA
• Python
• Security
• TDD
• microservices
• ARM

More:

We are supporting a major Core Banking transformation using Thought Machine Vault Core. The role is based in London on a contract basis, with a negotiable salary. We are a specialist talent acquisition and management consultancy providing technical contingency recruitment and more complex resource solutions across the UK and global technical sectors.

last updated 35 week of 2026