Note: The job is a remote job and is open to candidates in USA. MoonPay is building a developer platform that lets partners create native payment and crypto experiences within their own products. The Senior Software Engineer will build and operate APIs, SDKs, and embedded integrations that make MoonPay’s payment capabilities secure, reliable, and straightforward for external developers to use.
Responsibilities
- Design and build APIs, SDKs and embedded components used by external developers
- Turn MoonPay’s existing authentication, identity, payment and purchasing capabilities into reusable platform modules
- Develop secure browser and mobile integration patterns across iframes, web views and native applications
- Create stable abstractions over complex payments, compliance and crypto infrastructure
- Build reference applications, sandboxes and tooling that help developers move quickly from exploration to production
- Own the complete developer journey, from obtaining credentials through to completing a live transaction
- Design clear interfaces for sessions, authentication, quotes, payment methods, transaction state and errors
- Handle the realities of browser and mobile environments, including cross-origin communication, redirects, storage restrictions and application lifecycle events
- Develop consistent behaviour across web, iOS and Android integrations
- Ensure integrations remain secure when operating inside products MoonPay does not control
- Design APIs and SDKs that are difficult to misuse and straightforward to debug
- Establish clear versioning, compatibility and migration strategies
- Build documentation around how developers actually use the platform rather than treating it as a secondary deliverable
- Create useful errors, logs and observability so partners can resolve issues without contacting MoonPay
- Reduce integration time and the amount of direct support required from engineering
- Build systems where failures can prevent a customer from completing a purchase or leave a partner uncertain about transaction state
- Design for retries, duplicate events, delayed responses and dependencies failing in unexpected ways
- Implement idempotency, state recovery and graceful degradation across distributed payment flows
- Measure API and SDK adoption, integration success, reliability and developer experience
- Safely evolve the platform as MoonPay adds products, payment methods, regions and partners
Skills
- You have built APIs, SDKs, embedded components or integration tooling used by third-party developers
- You understand how browsers and mobile applications behave beneath the framework level, including sessions, storage, cross-origin communication and embedded experiences
- You have strong language fundamentals and have built production client-side or SDK infrastructure
- You understand versioning, backwards compatibility, documentation, error design and safe migrations
- You build correctly when events arrive twice, late or out of order and when dependencies fail
- You can turn complex platform capabilities into interfaces that developers can understand and adopt
- You have taken developer-facing software from design through launch, adoption and ongoing production support
- Built payment APIs, checkout SDKs, embedded financial products or payment-method integrations
- Built products similar to Stripe Elements, Stripe.js, Plaid Link or Braintree's client SDKs
- Experience with secure iframes, web views, postMessage or cross-origin browser infrastructure
- Developed SDKs across web, iOS or Android
- Built sandboxes, test environments, reference applications or developer documentation
- Experience with webhooks, idempotency, transaction state machines and payment orchestration
- Worked on authentication, identity or KYC integrations
- Familiarity with cryptocurrency, wallets or digital-asset products
- Familiarity with our stack: TypeScript, Node.js, React, GCP, PostgreSQL, Redis and Kubernetes
Benefits
- Competitive salary package
- Equity package: all employees have ownership at MoonPay
- Pay-for-performance equity bonus: those who drive outsized outcomes receive outsized rewards
- Moonshot award: 20 employees 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
- Recharge Period: end-of-year company-wide time off to rest and reset
- Birthday leave: take the day off to celebrate you
- Enhanced parental leave
- Hybrid working schedule: work fully remotely or from your nearest Moonbase
- Commuter benefits: public transport to and from the office
- Private healthcare benefits
- Wellhub wellness membership: access to gyms, studios, classes, and wellness apps in one membership
- 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
- 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
- High Potential Program: structured development, mentorship, and stretch opportunities
- Regular remote company offsites: high-impact in-person sessions and hackathons
Company Overview
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