Fun.xyz

Cross-chain wallet API for DeFi payments

Protocol Engineer

Blockchain & Smart Contract EngineeringConfirmed live in the last 24 hours

Full-timeSingaporeNo salary listedHybrid

About the Job

Requirements

Strong experience building and deploying production smart contracts on major blockchain platforms.
Deep understanding of blockchain architecture, consensus mechanisms, and cryptographic principles.
Hands-on experience with smart contract development languages, such as Solidity, Rust, and Move.
Solid grasp of decentralized finance protocols, token standards, and cross-chain communication patterns.
Knowledge of common smart contract vulnerabilities and best practices.
Ability to explain complex blockchain concepts to cross-functional teams.

Responsibilities

Design, develop, and deploy secure smart contracts and protocol implementations across multiple blockchain platforms.
Collaborate with backend and product teams to architect blockchain solutions that meet business requirements.
Write efficient, well-tested code and participate in security audits to ensure protocol safety.
Research and evaluate new blockchain technologies, protocols, and decentralized finance primitives for integration opportunities.
Contribute to incident response and debug on-chain issues to ensure protocol reliability.

Desired Qualifications

Production experience with multiple blockchain ecosystems, such as Ethereum, Solana, and layer 2 networks.
Previous work at a crypto startup or Web3 infrastructure company.
Experience with cross-chain bridges, oracles, or interoperability protocols.
Background with high-volume decentralized finance protocols or decentralized exchange infrastructure.
Contributions to blockchain open-source projects or protocol research.
Experience with formal verification or advanced smart contract testing frameworks.

At Fun, we’re building the financial infrastructure for internet capital markets.

The systems that power global finance were designed for a different era: slower, fragmented, and constrained by borders. Today, value is digital, global, and moves instantly, but the experience of moving it hasn’t caught up.

Fun offers the highest converting payment solution in the digital asset space – a unified system that enables users to complete any on-chain action using crypto, exchange balances, or fiat from a card or bank account, all in a single, seamless flow.

Our goal is simple: make transacting with any asset feel effortless, anywhere in the world.

Role Overview

We're looking for a Protocol Engineer to join our core blockchain team and help build the foundation of Web3 payments infrastructure. This high-impact role offers the opportunity to work on challenging technical problems at the intersection of smart contracts, cross-chain protocols, and decentralized finance.

You will design and implement secure, efficient smart contract systems and blockchain integrations that power millions of transactions across multiple chains. This role is perfect for a technically strong engineer who thrives in fast-paced environments and wants to shape the future of decentralized finance.

Responsibilities

Design, develop, and deploy secure smart contracts and protocol implementations across multiple blockchain platforms
Collaborate with backend and product teams to architect blockchain solutions that meet business requirements
Write highly efficient, well-tested code and participate in security audits to ensure protocol safety
Research and evaluate new blockchain technologies, protocols, and DeFi primitives for integration opportunities
Contribute to incident response and debugging on-chain issues to ensure protocol reliability

Requirements

Strong experience building and deploying production smart contracts on major blockchain platforms
Deep understanding of blockchain architecture, consensus mechanisms, and cryptographic principles
Hands-on experience with smart contract development languages (Solidity, Rust, Move, etc.)
Solid grasp of DeFi protocols, token standards, and cross-chain communication patterns
Strong security mindset with knowledge of common smart contract vulnerabilities and best practices
Clear communicator who can explain complex blockchain concepts to cross-functional teams

Nice To Have

Production experience with multiple blockchain ecosystems (Ethereum, Solana, L2s, etc.)
Previously worked at crypto startup or Web3 infrastructure company
Experience with cross-chain bridges, oracles, or interoperability protocols
Background with high-volume DeFi protocols or DEX infrastructure
Contributions to blockchain open source projects or protocol research
Experience with formal verification or advanced smart contract testing frameworks

About the Company

Fun.xyz

Cross-chain wallet API for DeFi payments

Fun.xyz provides the API and infrastructure to build cross-chain decentralized wallets on the Odsy blockchain. Its tools give developers wallet APIs and protocols to create secure, interoperable dWallets that can send and receive assets across chains within Odsy. Unlike generic wallet providers, Fun.xyz concentrates on the Odsy Network and offers foundational wallet components and cross-chain infrastructure to help developers deploy DeFi apps. Its goal is to enable a tokenized world with seamless cross-chain wallet experiences, making it easier for businesses to build and run DeFi applications on Odsy.

Company size: 51-200
Company stage: Series A
Total funding: $82.9M
Headquarters: New York City, New York
Founded: 2022

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