Mid Level Smart Contract Engineer

G-20 Group; New York (NY); On-site; USD 120,000 - 170,000; Full time

Job summary

A financial technology company is hiring an experienced Smart Contract Engineer for its New York office. The role involves designing and developing on-chain components related to operator registration, fee distribution, and smart contract interfaces. Candidates should have a Bachelor's degree and at least 3 years of experience in Solidity and smart contract development. This position is crucial for ensuring security and trust within the financial ecosystem.

Qualifications

• 3+ years of production experience in smart contract development.
• Experience using Foundry for testing and deployments.
• Awareness of smart contract attack vectors.

Responsibilities

• Design, develop, and maintain all on-chain components.
• Build and manage end-to-end operator registration flow.
• Automate fee collection and distribution across participants.

Skills

Solidity expertise

Strong communication skills

Foundry proficiency

DeFi perpetuals knowledge

Security-oriented mindset

Governance & access control experience

SDK & interface design

Education

Bachelor's degree in Computer Science, Engineering, or related field

Tools

Foundry

Solidity

Rust

Job description

About G-20

The G-20 Group is a pioneer in Quantitative Trading systems in cross-asset markets. Headquartered in Switzerland, we operate at the intersection of Quantitative Research, Software Engineering and Trading. The team combines a startup mindset with extensive experience in proprietary Trading, Technology and Quantitative Finance.

Role Overview

We are hiring for an experienced, driven Smart Contract Engineer with responsibility for the design, development, and ownership of all on‑chain components, including operator registration, stake management, fee distribution automation, and the smart contract interfaces utilized by AI agents and trading systems to interact with our markets.

Your work will serve as the foundational trust layer between multiple participants within the ecosystem and as such is highly security‑critical. The smart contracts you develop will manage slashable collateral, automate fee distribution across multiple active markets, and be subject to external audits and public accessibility.

Key Responsibilities

• Operator Registration & Lifecycle: Build and maintain the end‑to‑end operator registration flow, including collateral locking, credential submission, and market configuration. Enable seamless addition of new markets without re‑registration and ensure clear separation of operator identity and market parameters.
• Stake Management & Slashing: Develop smart contracts for staking, unstaking (with cooldowns), and handling partial/full slashing. Implement co‑staker models with fair fee distribution and robust handling of all slashing edge cases.
• Fee Distribution Automation: Automate fee collection and distribution across treasury, co‑stakers, and liquidity participants with transparent, auditable, and fully autonomous systems.
• Agent & Bot Interfaces: Design efficient on‑chain interfaces for AI agents and trading bots, including batch operations and data queries. Provide well‑documented SDKs in Python, TypeScript, and Rust.
• Market Governance: Implement secure governance for updating market parameters, incorporating safeguards such as timelocks, multi‑sig approvals, and on‑chain auditability.
• Security & Audit Readiness: Ensure audit‑ready code with comprehensive testing (including fuzzing and invariants) and support external audits and bug bounty programs.

Requirements

• Bachelor's degree (minimum) in Computer Science, Engineering, Mathematics, Data Science, or a related field, top‑tier university preferred.
• Strong written and verbal communication skills.
• Solidity expertise: 3+ years of production experience in smart contract development. Strong understanding of the EVM, including gas optimization, storage layout, proxy patterns, and reentrancy protection.
• Foundry proficiency: Experience using Foundry as a primary development framework, including Forge testing, fuzz testing, invariant testing, and scripted deployments. Demonstrated ability to achieve high test coverage across security‑critical code paths.
• DeFi perpetuals knowledge: Solid understanding of perpetual futures architecture, including funding rates, mark vs. index pricing, liquidation mechanisms, and auto‑deleveraging. Familiarity with design approaches across leading on‑chain perpetual protocols.
• Security‑oriented mindset: Strong awareness of smart contract attack vectors and exploit patterns, including flash loans, oracle manipulation, access control vulnerabilities, and front‑running. Experience preparing codebases for external security audits.
• Governance & access control: Experience implementing and managing multi‑signature wallets, timelock mechanisms, and secure on‑chain parameter governance with safe upgrade patterns.
• SDK & interface design: Proven ability to design clean and developer‑friendly ABIs, emit events for off‑chain indexing, write comprehensive NatSpec documentation, and generate typed SDK bindings across multiple programming languages.

Preferred / Desirable Experience

• Rust smart contracts: Smart contract development in Rust‑based environments (Solana, NEAR, CosmWasm).
• Formal verification: Experience with Certora, Halmos, or symbolic execution tools for proving contract invariants.
• Oracle & cross‑chain patterns: Understanding of how off‑chain data (oracle prices, external state) is delivered to on‑chain contracts and the trust assumptions involved.
• RWA tokenisation: Familiarity with tokenised real‑world asset protocols and how their collateral types integrate with DeFi margin and lending systems.
• Institutional custody integration: Experience integrating institutional custody solutions (MPC‑based or equivalent) for programmatic transaction signing.

Location and Right to Work

This role will preferably be based in our Zurich office but could alternatively be based out of our London, New York, Chicago, or Hong Kong offices. Only candidates who possess the pre‑existing right to work in one of the locations above without needing company sponsorship need to apply.

Join G-20 Group and be a part of a team that is at the forefront of financial markets, driving innovation and excellence in the sector.