Staff Engineer, Agents

• Own significant areas of PayBox end-to-end, from identifying the problem and defining the approach through to building, shipping and iterating in production.
• Help take a recently launched product through its next phase of 0→1 development and growth.
• Build new payment and peer-to-peer transfer experiences designed for AI interfaces.
• Build integrations across AI platforms, applications and the wider PayBox ecosystem.
• Help develop the infrastructure and product experiences required to bring new applications and integrations onto PayBox.
• Work closely with Product to turn ambitious ideas into simple, usable experiences.
• Sweat the details of the PayBox experience — particularly onboarding and UX — and fix the friction that prevents users from successfully using the product.
• Reason from first principles about difficult technical and product problems, making pragmatic decisions without waiting for perfect information.
• Move across different parts of the product and technical stack depending on where the highest-impact problem is.
• Use AI extensively to increase your speed and output while maintaining your own technical reasoning, judgement and attention to detail.

We’re deliberately not defining the ideal candidate by a particular technology stack or domain.

There are three things we care deeply about: technical ability, motivation and thoroughness.

We’re looking for someone exceptional across all three.

Must-have experience and skills

• Exceptional technical reasoning. You have strong engineering fundamentals and can break down unfamiliar, ambiguous problems and reason towards good solutions.
• High agency. You don’t wait for perfectly defined requirements or someone else to identify what needs doing. You find important problems and take responsibility for solving them.
• End-to-end ownership. You’ve built and shipped meaningful products, projects or systems from beginning to end rather than operating within a narrowly defined area.
• Thoroughness. You care deeply about the quality of your work and sweat details others might overlook. Getting something working is the beginning, not the end.
• Strong systems thinking. You can design systems, understand technical trade-offs and make sensible architectural decisions while moving quickly.
• Product judgement. You understand that great engineering includes the experience around the technology, not just the underlying implementation.
• Comfort with ambiguity. You’re at your best in environments where there are more problems than people and priorities can change quickly.
• Independent thinking in an AI-native environment. You use AI aggressively as a tool, but you don’t outsource your reasoning to it. You understand the output, challenge it and remain accountable for what you ship.
• Deep motivation. You want ownership and responsibility and care about the outcome of the product, not simply completing the work assigned to you.

Nice-to-have experience

• Experience as a founding engineer or early engineer at a high-growth startup.
• Experience founding and building your own company or product.
• Experience taking a product from an idea through launch and subsequent iteration.
• Experience operating in small, highly autonomous engineering teams.

• Experience building AI-native products, agents or developer tooling.
• Experience with payments, fintech, crypto or DeFi.
• Previous experience with MCP or other emerging agent protocols.

None of these are prerequisites.

We care considerably more about how you think, what you’ve built, how you operate and how much you care about the quality of your work.

• 💰 Competitive salary package
• 🤝 Equity package: financial freedom starts with our employees, so all employees have ownership at MoonPay
• 📈 Pay-for-performance equity bonus: those who drive outsized outcomes receive outsized rewards
• 🚀 Moonshot award: we honor exceptional impact. 10 employees twice a year, each earning a $250,000 equity grant
• 📊Pension: employer contributions from day one
• 🎁Employee referral program: refer great people, earn 10K in USDC
• 🏝 Flexible Time Off: choose when to work and when to switch off
• 🎂 Birthday leave: take the day off to celebrate you
• 🍼 Enhanced parental leave: more time with family, no second thought
• 🌍 Hybrid working schedule: work fully remotely or from your nearest Moonbase
• 🚆 Commuter benefits: public transport to and from the office
• 🩺 Private healthcare benefits: to protect you and your loved ones
• 🧘 Wellhub wellness membership: access to gyms, studios, classes, and wellness apps in one membership
• 🤖 Unlimited enterprise access to the latest AI tools: Claude, ChatGPT, Gemini and whatever's next
• 🍱 Lunch credit: meals covered on the days you're in the office
• 🪑 Home office setup allowance: build the home office of your dreams
• 👛 Remote working allowance: those working fully remotely get a little extra for utilities
• 🌕 Monthly product budget and zero-fee crypto transactions
• 📚 $1,000 Annual training budget: we support your learning journey
• 🎯 High Potential Program: structured development, mentorship, and stretch opportunities
• ✈️ Regular remote company offsites: high-impact in-person sessions and hackathons
• 🚲 (Ireland) Cycle to Work scheme: tax-efficient bike, gear, and safety kit
• 🔌 (UK) EV Salary Sacrifice: lease an electric vehicle through pre-tax salary