Senior Blockchain Engineer – Smart Contracts & Tokenization (Contract) / YRS EXP REQ

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 Apply tot his job Apply To this Job