---
title: 'Backend Engineer - Card Transaction Processing at Ether.fi'
canonical: 'https://feeny.ai/job/backend-engineer-card-transaction-processing-ether-fi-new-york-nfsrsmgr6gvh'
type: 'job'
last_seen: '2026-09-04'
---

# Backend Engineer - Card Transaction Processing at Ether.fi

- **Company:** Ether.fi
- **Location:** New York, NY
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-04-03
- **Last confirmed live:** 2026-09-04
- **Apply:** https://jobs.ashbyhq.com/ether.fi/d273dd53-48a2-4e6d-9cb3-e3c1b383b049

## Job description

About us:

Ether.fi http://Ether.fi is one of the largest crypto companies in the world. We have over $10B in assets under management and a team of 30 almost all technical staff. We’ve been profitable day one and are focusing on building real consumer applications.

The future we envisage is true on-chain banking. Our current products; Stake, Liquid, and Cash enable users to earn yield in a variety of DeFi strategies, and spend their assets in the real world with our credit cards. You can view public analytics on Dune for Cash https://dune.com/ether_fi/etherfi-cash and Stake https://dune.com/ether_fi/etherfi.

Position overview:

We’re looking for a senior full backend software engineer to own core backend architecture, card transaction processing and high availability. You will belong to a key engineering team focusing on delivering distributed, scalable and robust backend systems. Everything from card transaction processing, low latency apis, microservice architectures and on-chain data indexing. Anything that a neobank would build is on our roadmap.

What you’ll do:

- Own core areas of our backend systems, and extend current functionality to improve throughout and latency
- Design, develop, and optimize scalable transaction processing services to support high-throughput, low-latency financial transactions.
- Tackle the challenges in user frictions for their card transactions being declined
- Drive improvements in our Cloud Infrastructure, CI/CD pipelines, automation, observability, and monitoring systems.

What we are looking for:

- Strong fundamentals in software engineering and problem solving
- You have shipped impressive products with thousands of real users
- 5+ years of professional coding experience
- Drive, willingness to work hard and go the extra mile. We are a highly ambitious, driven team with audacious goals, and we work very hard to make them a reality
- Plus if you are experienced in credit card transaction processor such as Paymentology, Episode 6, etc.
- Plus if you are experience in card issuing side

Perks and benefits:

- Competitive salary, performance-based incentives, and token allocation grant
- Opportunity to work on multi-billion dollar products as part of a small team
- Health, dental, and vision insurance plans
- Global team with opportunity for travel and working out of our 3 offices around the world
- 4 weeks work from anywhere
- Exciting company events and team-building off-sites

## About Ether.fi

## Company Overview
- **One-liner**: Ether.fi is a leading non-custodial liquid staking protocol and DeFi ecosystem building the rails for decentralized, on-chain banking.
- **Entity Type**: Private (Series A)
- **Headquarters**: George Town, Cayman Islands
- **Founded**: 2022
- **Founders**: Mike Silagadze (CEO) and Rok Kopp

## Core Business
- **Primary Industry**: Decentralized Finance (DeFi) / Liquid Staking / Crypto Financial Services
- **Target Customers**: Crypto-native individual stakers (B2C), institutional node operators, and DeFi users seeking yield and spending products.
- **Mission**: To put users in charge of their wealth—making it easy to save, earn, and spend crypto in a secure, transparent, and non-custodial way.

## Products & Services
- **[Stake (eETH/weETH)](https://www.ether.fi/careers)**: A non-custodial liquid staking protocol. Users stake ETH or stETH and receive eETH (or weETH for DeFi composability), which accrues staking rewards and can be used across DeFi. It is natively re-staked to earn additional yield.
- **[Liquid](https://www.ether.fi/careers)**: Automated strategy vaults that find and optimize yields for users across DeFi protocols.
- **[Cash](https://www.ether.fi/careers)**: A Visa credit card product allowing users to spend and borrow against their crypto assets without selling them. Includes a KYC process and fraud detection.
- **[eBTC](https://www.ether.fi/blog/non-custodial-actively-defended)**: A liquid staking token for Bitcoin, extending the protocol’s non-custodial staking model.
- **[eUSD](https://www.ether.fi/blog/non-custodial-actively-defended)**: A stablecoin product within the ether.fi ecosystem.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company).
- **Key Metric**: Over **$10B in assets under management (AUM)** as of June 2026. The company has been **profitable since day one**.
- **Total Funding**: $32.3M raised across 4 rounds (Series A).
- **Notable Investors**: CoinFund, Node Capital, Chapter One (26 institutional investors and 4 angel investors total).
- **Growth Signals**: A team of ~30 people (almost all technical staff) managing over $10B in AUM, demonstrating extreme capital efficiency. The company is actively expanding its product suite into consumer credit cards (Cash) and Bitcoin staking (eBTC), signaling a move from pure DeFi infrastructure to end-user financial applications.

## Competitive Advantages
- **Non-Custodial + Actively Defended**: The protocol is designed so that ether.fi cannot unilaterally move user funds (non-custodial), but it can pause the system and block in-flight attacks to protect users. This is a unique security doctrine that avoids the "decentralization theater" that leaves users drained during exploits.
- **Four-Layer Security Architecture**: Operational security (key/infra hygiene), smart contract bounds (timelocks, rebate caps), crosschain defenses (4-of-4 DVN quorum, per-chain rate limits), and real-time active defense (wired to Hypernative monitoring).
- **Capital Efficiency**: A tiny team (~30) manages a massive $10B+ asset base, indicating highly automated, lean operations and strong technical leverage.
- **Profitability**: Profitable from day one, avoiding the "ponzinomics" and unsustainable token models common in the space.

## Strategic Focus
- **Building Real Consumer Applications**: The company is focused on moving beyond pure DeFi infrastructure into mainstream financial products like the Ether.fi Cash Visa card, bridging the gap between crypto and everyday spending.
- **True On-Chain Banking**: The long-term vision is to offer a full suite of non-custodial financial services (savings, lending, spending) entirely on-chain.
- **Security-First Growth**: The public security doctrine (non-custodial, actively defended) is a core differentiator and a key focus of engineering effort, as outlined in their blog.

## Why Work Here
- **High Impact, Small Team**: With ~30 employees and $10B+ in AUM, every employee has outsized responsibility and influence on the product and protocol.
- **Top Compensation**: Annual performance-based bonuses, option to be paid in ETH, and a share of token allocation.
- **Wellness Benefits**: Unlimited paid time off, one month per year to work fully remotely, plus health, dental, and vision coverage.
- **In-Office Collaboration**: The company emphasizes in-person work (79% on-site, 16% hybrid) with offices in New York, Denver, Grand Cayman, and Dubai. They believe face-to-face interaction drives success.
- **Culture & Events**: Frequent company off-site retreats (e.g., Cayman Islands, Lisbon) and attendance at top crypto events.
- **Engineering Culture**: A builder-first environment with a focus on security, smart contract engineering, and real-time fraud/scam hunting. The interview process includes a skills-based interview and a final meeting with the CEO.
- **Guiding Principles**: Decentralization is a primary objective, sustainable revenue model, and "never compromise on ethics."

## Sources
1. [ether.fi Careers Page](https://www.ether.fi/careers)
2. [ether.fi Security Doctrine Blog](https://www.ether.fi/blog/non-custodial-actively-defended)
3. [Tracxn - ether.fi Company Profile](https://tracxn.com/d/companies/etherfi/__ybuswctFLX6Yyk0tndtj8aoDimNowhN3z_XQDPgnARo)
4. [Jobera - ether.fi Careers](https://jobera.com/employer/ether-fi/)
5. [ether.fi Jobs on Ashby](https://jobs.ashbyhq.com/ether.fi)

## Other roles at Ether.fi

- [Security Engineer](https://feeny.ai/job/security-engineer-ether-fi-cayman-tztb3kb47rec) — Cayman
- [Data Insights & Analytics Lead](https://feeny.ai/job/data-insights-analytics-lead-ether-fi-cayman-aa10rxkvkv0v) — Cayman
- [Smart Contract Lead](https://feeny.ai/job/smart-contract-lead-ether-fi-new-york-y7nb97z7sg7n) — New York, NY
- [Fraud Lead (Scam Hunter)](https://feeny.ai/job/fraud-lead-scam-hunter-ether-fi-new-york-ggw0merc1p78) — New York, NY
- [Senior Full Stack Software Engineer](https://feeny.ai/job/senior-full-stack-software-engineer-ether-fi-new-york-6wnw9p39xvcm) — New York, NY
- [Smart Contract Engineer](https://feeny.ai/job/smart-contract-engineer-ether-fi-cayman-fd7de65crxxw) — Cayman
- [Front End Engineer](https://feeny.ai/job/front-end-engineer-ether-fi-new-york-mb3h6p7nyqgr) — New York, NY
- [Customer Service Representative](https://feeny.ai/job/customer-service-representative-ether-fi-cayman-xmqyr7kxgfds) — Cayman
- [KYC Analyst – Ether.fi Cash Program](https://feeny.ai/job/kyc-analyst-ether-fi-cash-program-ether-fi-cayman-fz1wjfa6f92m) — Cayman
- [Senior Software Engineer - Backend](https://feeny.ai/job/senior-software-engineer-backend-ether-fi-new-york-8883560ss8bh) — New York, NY