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

🌍 Remote, USA 🎯 Full-time 🕐 Posted Recently

Job Description

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.

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.

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

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

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)

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

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