Senior Web3 Engineer: Secure Escrow & Foundry-First

Featmate; United States; Hybrid; USD 150,000 - 220,000; Full time

Job summary

Featmate is assembling a stealth escrow protocol where security and correctness trump flashy features. We’re hiring a senior contributor who treats code as legal text and as a financial instrument, with a strong emphasis on production smart contracts and gas-conscious design.

The role centers on hardening the escrow state machine in a Foundry-first workflow, building a seamless UI with wagmi/viem, and prioritizing tests over features. Remote-first, US/EU timezones welcome.

Qualifications

• You have shipped production smart contracts and understand the cost of gas and the danger of reentrancy.
• You are an expert in the React/Next.js stack and manage complex async state in Web3.
• You prefer writing tests over writing features.

Responsibilities

• Own the security and efficiency of our escrow state machine.
• Work in a Foundry-first environment with invariant tests and bulletproof deployment flows.
• Build a UI that makes complex multi-step transactions feel seamless using wagmi/viem.

Skills

Smart contracts

Foundry

React/Next.js

Web3

Testing

Tools

Foundry

wagmi/viem

Job description

We are building a trust-minimized escrow protocol in stealth. We aren't focused on marketing—we are focused on shipping secure, audited, on-chain logic. We are looking for a senior contributor who treats smart contract code like a legal document and frontend code like a high-stakes financial tool.

The Challenge

- Hardening: You will own the security and efficiency of our escrow state machine.

- Foundry-First: We live in Foundry. You will be writing invariant tests and ensuring our deployment flows are bulletproof.

- UX/UI: You will build the interface that makes complex multi-step transactions feel seamless using wagmi/viem.

Your Profile

- Location: Must be based in US or EU timezones (UTC-8 to UTC+2).

- You have shipped production smart contracts and understand the cost of gas and the danger of reentrancy.

- You are an expert in the React/Next.js stack and manage complex async state in Web3.

- You prefer writing tests over writing features.

- You want to solve a real-world problem (trust) rather than just "building another DApp."

The Pipeline

We respect your time. Our hiring process is designed to filter for elite engineering talent:

- Initial Submission: Send your GitHub/Portfolio.

- Initial Vetting: We review all submissions to ensure technical alignment.

- The Paid Assessment: If your profile aligns, you will be invited to complete a 4–6 hour paid technical assessment. We pay for your time because we respect your expertise.

- Technical Deep-Dive: If your assessment passes our security and quality standards, we will schedule a short, high-level meeting to discuss your implementation.

- Workspace Access: Only after successful vetting and a deep-dive meeting will you be invited to our private Slack workspace. This ensures our collaboration environment remains productive and secure.

To Apply:

Reach out via WhatsApp [phone]).

Include:

- The most complex smart contract project you’ve shipped.

- One reason why you prefer Foundry over Hardhat.