Blockchain Developer Job Description Template

Solidity engineering · 27%
Core requirement for building and maintaining smart contracts with correct logic and robust patterns. Evaluated in Round 1.

• Weak: Implements contract logic with frequent logic gaps that require substantial rework and struggles to explain core functions and state transitions.
• Meets the bar: Builds and modifies Solidity contracts that compile cleanly, follow agreed interfaces, and can explain key state changes and invariants.
• Strong: Designs and implements contract logic with clear invariants, handles edge cases proactively, and anticipates operational constraints (upgrades/compatibility where relevant).

Blockchain security practices · 23%
Directly impacts risk profile and production reliability for smart contract systems. Evaluated in Round 2.

• Weak: Applies security patterns inconsistently and overlooks common vulnerabilities or access-control risks.
• Meets the bar: Identifies and mitigates common smart contract risks (e.g., reentrancy, access control, input validation) and can justify design choices.
• Strong: Proactively designs for abuse cases, understands threat models, and applies layered mitigations with clear reasoning and evidence.

Smart contract testing · 18%
Ensures changes are validated and regressions are caught early. Evaluated in Round 1.

• Weak: Creates limited tests, avoids covering edge cases, or cannot explain how tests map to contract risks.
• Meets the bar: Writes unit and/or integration tests that cover key scenarios and failure paths, and can interpret test results.
• Strong: Builds comprehensive, risk-focused test suites (including adversarial cases), uses good abstractions/mocking, and demonstrates how tests prevent specific classes of bugs.

Deployment and debugging · 16%
Independent operation requires diagnosing failures and executing reliable deployments. Evaluated in Round 2.

• Weak: Relies on guesswork for transaction failures and cannot trace issues to causes using available tooling.
• Meets the bar: Uses explorer/traces and logs to debug transaction failures and can describe deployment steps and verification approach.
• Strong: Systematically isolates root causes across on-chain/off-chain boundaries, improves workflows to reduce failure recurrence, and communicates findings clearly.

Off-chain integration thinking · 8%
Improves the quality of contract-adjacent systems and event/data handling. Evaluated in Round 3.

• Weak: Understands contracts and data flows at a high level but struggles to connect event streams to off-chain behavior.
• Meets the bar: Explains how off-chain services consume contract events/state and handles common integration concerns (ordering, retries, idempotency).
• Strong: Designs resilient integrations with explicit guarantees (idempotency, reorg tolerance where applicable, backfills) and validates assumptions with evidence.

Independent delivery · 8%
Mid-level expectation: works independently on well-defined work while coordinating effectively. Evaluated in Round 3.

• Weak: Needs frequent guidance to move forward and cannot reliably scope or manage deliverables.
• Meets the bar: Takes ownership of well-defined tasks, proposes next steps, and delivers with clear status updates and risk callouts.
• Strong: Independently scopes tasks, unblocks stakeholders, anticipates risks early, and delivers measurable outcomes with minimal supervision.