---
title: 'Protocol Engineer (Singapore) at fun.xyz'
canonical: 'https://feeny.ai/job/protocol-engineer-singapore-fun-xyz-singapore-ysk6k1wk0jvh'
type: 'job'
last_seen: '2026-09-09'
---

# Protocol Engineer (Singapore) at fun.xyz

- **Company:** fun.xyz
- **Location:** Singapore
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2025-09-22
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.lever.co/funxyz/ad4e3748-1baa-498a-b158-c8d657a336cf

## Job description

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 fun.xyz

## Company Overview
- **One-liner**: Fun builds financial infrastructure for modern capital markets, providing a unified layer where digital assets and fiat converge for instant, global, programmable value movement.
- **Entity Type**: Private (Series A)
- **Headquarters**: New York, NY, USA
- **Founded**: 2022
- **Founders**: Alex Fine (Co-Founder & CEO)

## Core Business
- **Primary industry**: Financial infrastructure / Cryptocurrency payments
- **Target customers**: B2B – large fintech platforms, applications that need high-converting, white-label deposit/withdrawal/settlement flows
- **Mission**: “Financial infrastructure for modern capital markets. Built for the next era of money.” – unify fiat and digital assets into a seamless, global layer.

## Products & Services
- **Deposit** (launched 2026): A new category for global payments that replaces fragmented on-ramps and bridges with a single, unified flow. [fun.xyz/linkedin post via Coindesk](https://linkedin.com/company/funxyz)  
- **Exchange OS** (announced 2026): A protocol upgrade that democratizes market creation on X (likely referring to a blockchain platform). [linkedin.com/company/funxyz](https://linkedin.com/company/funxyz)  
- **White-label checkout platform for web3**: Enables users to execute on-chain actions using cards, EVM tokens, or centralized exchanges. [builtin.com/company/funxyz](https://builtin.com/company/funxyz)  
- **Settlement & payment flows**: Engineered around user behavior, powering deposits, withdrawals, and settlement for the largest fintech applications.

## Market Standing
- **Valuation/Market Cap**: Not disclosed. Total funding of **$82.9M** (Seed rounds $3.9M + $7.0M, Series A $72.0M).  
- **Key Metric**: Revenue not publicly available (third-party estimate of $30K may be nominal). Series A announced in May 2026.  
- **Notable Investors/Partners**: Multicoin Capital and SignalFire (co-led Series A), Streamlined, Infinity Ventures, Cory Levy, JAM Fund, Pharsalus Capital.  
- **Growth Signals**:  
  - Headcount grew **109.3% YoY** to 28 employees.  
  - Opened a Singapore office (APAC expansion).  
  - Monthly website traffic grew **1,078.1% YoY**.  
  - Currently hiring for 10 roles (Backend, Product, Sales, etc.).

## Competitive Advantages
- **Unified infrastructure** – Eliminates fragmentation between fiat and crypto, on-ramps, bridges, and chains.  
- **White-glove, white-label** approach – Built around each client’s user behavior for highest conversion.  
- **Engineering craftsmanship** – “Good enough is never enough” culture; deep tech stack (Solidity, TypeScript, Python, Kubernetes, etc.).  
- **Early mover** in the “internet capital markets” category with strong investor backing.

## Strategic Focus
- **APAC expansion** via Singapore office and local hiring.  
- **Acquisitions** to deepen infrastructure (funds from Series A).  
- **Scaling the team** – actively hiring engineers, product designers, and business development leads.  
- **Product development** – advancing Exchange OS and Deposit as core platforms.

## Why Work Here
- **Culture**: Values of _Relationships_, _Craftsmanship_, and _Whatever it takes_ – a team of exceptional engineers taking ownership, sweating details, and solving high-leverage infrastructure problems.  
- **Work model**: Hybrid – offices in New York, NY and Singapore. OnSite workspace per Built In; job postings list hybrid.  
- **Team**: Small but hyper‑growth (28 employees, +109% YoY); strong talent from Amazon, MIT Media Lab, OP Labs, Netflix.  
- **Perks**: Not formally listed, but the Series A announcement emphasizes “most meaningful work of your career” and a focus on craft. Likely competitive compensation and equity in a well‑funded startup.

## Sources
1. [fun.xyz/about](https://fun.xyz/about)  
2. [fun.xyz/news/series-a](https://fun.xyz/news/series-a)  
3. [linkedin.com/company/funxyz](https://linkedin.com/company/funxyz) (company page and job postings)  
4. [builtin.com/company/funxyz](https://builtin.com/company/funxyz)  
5. [jobs.lever.co/funxyz](https://jobs.lever.co/funxyz) (careers page)

## Other roles at fun.xyz

- [Forward Deployed Engineer, Enterprise](https://feeny.ai/job/forward-deployed-engineer-enterprise-fun-xyz-new-york-ypqd5cdqcz9p) — New York, NY
- [Senior Counsel](https://feeny.ai/job/senior-counsel-fun-xyz-new-york-x6bk9sk084q4) — New York, NY
- [Head of Compliance](https://feeny.ai/job/head-of-compliance-fun-xyz-new-york-1dkcnxjykwej) — New York, NY
- [Marketing Lead](https://feeny.ai/job/marketing-lead-fun-xyz-new-york-s7wqqmy0bk2n) — New York, NY
- [Senior Product Designer](https://feeny.ai/job/senior-product-designer-fun-xyz-new-york-s1vk5n430t1p) — New York, NY
- [People and Culture Associate](https://feeny.ai/job/people-and-culture-associate-fun-xyz-new-york-tnbh9865meg7) — New York, NY
- [Business Development](https://feeny.ai/job/business-development-fun-xyz-new-york-5cx9dh4ss6dd) — New York, NY
- [Protocol Engineer](https://feeny.ai/job/protocol-engineer-fun-xyz-new-york-jb4jex5zrfn3) — New York, NY
- [Product Engineer (Singapore)](https://feeny.ai/job/product-engineer-singapore-fun-xyz-singapore-3pakjzvr6hkm) — Singapore
- [Backend Engineer (Singapore)](https://feeny.ai/job/backend-engineer-singapore-fun-xyz-singapore-0z1txgff9rvd) — Singapore