Pay: $95,000.00 – $145,000.00 per year
Job Title: Senior Blockchain Systems Engineer — Smart Contracts, Settlement & Tokenization
Location: Remote (U.S.-based)
Job Type: Contract
Job Summary
Accorria is building a trust layer for high-value transactions. We generate tamper-evident data packets (facts + evidence hashes + audit trail) and enable escrow-style settlement workflows using smart contracts with optional tokenization.
You will build the blockchain + smart contract layer that powers:
• Verifiable packet systems (hashes + audit trails; no raw PII on-chain)
• Escrow / settlement contracts (finite-state machine + event validation)
• Agreement/receipt-style tokenization (ERC-3525 required)
• Backend ↔ chain integration (FastAPI + cloud + indexers/listeners)
This is not token hype. It must be demoable, auditable, and security-minded.
Qualifications (Required)
• 3–7+ years building blockchain + backend systems (or equivalent shipped work)
• Strong proficiency in Solidity and EVM-compatible networks
• Proven experience shipping multi-step workflow / state-machine contracts (escrow, settlement, ordering constraints)
• Strong smart contract security discipline:
• access control, reentrancy defenses, signature verification, replay prevention
• Strong integration experience:
• event listeners/indexers, contract interaction libraries (ethers.js/viem/web3.js), API integration
• Strong judgment around sensitive data handling:
• no raw PII on-chain; hashes/references only
• Token standards knowledge (Required):
• ERC-3525 (required)
• ERC-20 / ERC-721 / ERC-1155 (required familiarity)
• Ability to work independently in a fast-moving startup environment with milestone-based outcomes
• Excellent communication and problem-solving abilities
Preferred Skills (Nice to have)
• Account Abstraction / relayers / gas abstraction (wallet-friendly UX patterns)
• Deterministic JSON + hashing patterns (canonicalization, redaction, verifiable exports)
• Gas optimization and storage pattern discipline
• Prior ownership of contract architecture end-to-end (spec → build → test → ship)
• Audit experience or audit-ready engineering habits
Responsibilities
• Design and implement Solidity smart contracts for escrow-style settlement workflows, including:
• strict state/event ordering and required prior events
• signer authenticity + replay protection
• double-execution prevention and secure state transitions
• dispute/refund/failure handling
• Implement a hash-first architecture:
• keep sensitive documents/data off-chain
• store only hashes/references on-chain
• produce clean verification trails (timeline + checksums)
• Define and implement agreement/receipt-style tokenization using ERC-3525
• Build contract integration with backend services (FastAPI + cloud):
• event listeners/indexing strategy
• APIs/hooks for submit/verify/query history
• signing flows that support wallet-friendly UX where appropriate
• Maintain a strong security posture:
• invariants, tests, audit-ready patterns
• Write clean documentation + a short runbook (how to demo, verify, troubleshoot)
Compensation & Engagement
• Contract (1099)
• $95,000 – $145,000 per year (contract equivalent; depends on scope and milestones)
• Remote (U.S.-based)
• Milestone-based contract with an equity component; cash payout timing may be milestone-dependent as we finalize our current raise
• Long-term engagement possible based on delivery
Why Work With Accorria
• Build foundational smart-contract infrastructure for a real high-value transaction platform
• Work on verification + settlement primitives (not “token hype”)
• Define an agreement-first token model that supports compliance-heavy markets
• Fully remote, flexible schedule
• High ownership and direct influence on core architecture
Please include your LinkedIn profile URL in your application.
Work Location
Remote
Pay: $95,000.00 - $145,000.00 per year
Application Question(s):
• Have you worked with ERC-3525 in production?
• Paste your LinkedIn profile URL.
Experience:
• Solidity: 3 years (Required)
Work Location: Remote