Software Engineer, Card Payments & Fraud Defense

The Bitcoin Street Journal; New York (NY); Hybrid; USD 140,000 - 180,000; Full time

Benefits offered by this job

Competitive salary

Token allocation grant

Health, dental, and vision insurance

Global team with travel and 3 offices

Job summary

Ether.fi seeks a strong engineer to join the credit card transaction team and contribute to the success of the credit card program and its risk systems.

You will focus on the transaction stack—authorization and preventing unnecessary declines—while making defenses proactive with fraud monitoring and rule development. You’ll work with Product, CX, and Compliance and with card program and fraud vendors.

Qualifications

• Strong fundamentals in software engineering and problem solving.
• 4+ years of professional coding experience, shipping products.
• Product sense; care about the person on the other side of a declined transaction.
• Comfortable in the data, not just the codebase; dig into data by querying it.

Responsibilities

• Improve the card transaction experience by eliminating declines and frictions.
• Make the card program better as a product and ship fixes.
• Hunt fraud and abuse patterns such as card testing, cashback farming, and merchant abuse.
• Own the fraud stack: rules, queues, scoring logic, monitoring, alerts, and mitigation.
• Investigate live cases, query transaction data, and derive new rules to stop recurrence.
• Build internal tools, dashboards, and scripts to empower risk and CX teams.

Skills

Software engineering fundamentals

4+ years of coding experience

Product sense

Data querying

Adversarial problem solving

Tools

Sardine

SQL

Job description

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• Company: Ether.fi
• Location: New York New York City United States
• Sector: CryptoPerp
• Source: web3.career

About us

Ether.fi is one of the largest crypto companies in the world, with over $10B in assets under management and a team of ~50, almost entirely technical staff. We’ve been profitable since day one and are focused on building real consumer financial applications.

We believe the future of finance is true on-chain banking. Our products — Stake, Liquid, and Cash — let users earn yield through DeFi strategies and spend their assets globally through our credit card program. You can view our growth publicly on Dune (https://dune.com/ether_fi/etherfi-cash)

Position overview

We’re looking for a strong engineer to join credit card transaction team in ether.fi and contribute to the success of credit card program and the risk systems that sit on top of it.

The first pillar is the transaction stack: card authorization and every decline that shouldn’t have happened. You will look into what’s causing the user frictions based on the declines transactions and come up with pro-active solutions to prevent them.

The second pillar is fraud and risk. Today our defense is largely reactive; you will make it proactive on both sides of the line. Build the rules, monitoring, and internal tooling, and also use them: pull the data yourself, investigate the cases, work out what the attacker actually did, and turn that into the rule that catches it next time.

You’ll work closely with Product, CX, and Compliance, and directly with our card program and fraud vendors.

What you’ll do

Improve the card transaction experience: hunt down and eliminate the causes of declines, failed authorizations, stuck holds, and the frictions users actually hit when they spend

Make the card program better as a product; find where it breaks for real users, propose the fix, ship it

Hunt fraud and abuse patterns: card testing, cashback farming, merchant abuse, friendly fraud, trial and force-post abuse, multi-account rings

Own our fraud stack: rules, queues, and scoring logic in Sardine, plus real-time monitoring, alerting, and automated mitigation

Investigate live cases hands-on; query the transaction data, root-cause the pattern, and propose the rule or control that stops it recurring

Build internal tools, dashboards, and scripts that make our risk and CX teams dramatically more effective

What we are looking for

Strong fundamentals in software engineering and problem solving

4+ years of professional coding experience, shipping products

Product sense; you care about the person on the other side of a declined transaction, and you’d rather fix the cause than close the ticket

Comfortable in the data, not just the codebase; strong instinct to dig into the data by querying it rather than asking someone else to

Genuine interest in adversarial problems; you find it satisfying to stare at noisy transaction data and spot the pattern that shouldn’t be there, then explain why it’s there

Plus if you have

Worked at a fintech, neobank, card issuer, or issuer processor

Experience on the card issuing side, or with a card transaction processor

Knowledge of card and payment fraud mechanics: card testing, BIN attacks, friendly fraud, merchant collusion, cashback farming

Built on a fraud decisioning or transaction monitoring platform, and sat on the operational side of one

Run fraud investigations or disputes yourself, not only supported the people who do

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

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