Full Stack Software Engineer (Senior)
United States Digital Space LLC
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Benefits offered by this job
Job summary
Xe is rebuilding its platform layer for cross-border payments and seeks a senior full-stack engineer to own problems end-to-end—from API design and frontend experience through backend services, production reliability, and launch. You will work with AI tools daily and shape the stack across domains, partnering with product, design, and compliance.
You will mentor mid-level engineers, lead design reviews, and collaborate with architects and team leads on cross-domain decisions, delivering
Qualifications
- 6–10+ years building production web applications, end-to-end.
- Frontend proficiency with Vue.js, React, or equivalent.
- Backend proficiency in C#/.NET; other OOP languages welcome (Java, Kotlin, Go).
- Strong SQL and relational database fundamentals.
- Writing and maintaining tests as part of how you ship.
- Daily use of agentic coding tools across the SDLC.
- Production experience on AWS, including CI/CD pipelines and native services (SQS, DynamoDB, S3, ECS, Lambda).
- Strong system design and architecture experience, including microservices and event-driven patterns.
- Payments, FX, or regulated-industry experience.
- Technical leadership: mentoring engineers, leading design reviews, and architecture decisions.
- Strong communication across engineering, product, and design.
Responsibilities
- Design and own features across the stack that move money and manage multi-currency balances across onboarding, KYC/KYB, payment initiation, FX, settlement, and related services.
- Lead delivery of customer-facing features from interface to backend services.
- Own production health for your domain: reliability, observability, on-call and incident response.
- Lead cross-functional delivery with product, design, and compliance from framing to launch.
- Lead design reviews and set technical direction; mentor mid-level engineers.
- Use AI tools daily and modernize legacy services into the new stack with architects and leads.
Skills
Tools
Job description
Xe is a cross-border payments platform. We help SMEs and consumers in the US, UK, Canada, Australia, and New Zealand collect, convert, hold, and send money across markets. Each year, over 300 million people use Xe for currency information and over 350,000 use us to send money overseas.
Today, we're rebuilding the platform layer behind cross-border payments for corporate and consumer clients. We're small enough that your code ships fast and your decisions matter, and Euronet Worldwide (Nasdaq: EEFT) backs us so the problems stay real-scale.
We're hiring a senior full-stack engineer who owns real problems end-to-end and shapes how the team builds, from API design and frontend experience through to backend services, production reliability, and launch. You already use AI as part of how you think, build, test, and ship.
You'll write code that moves money in production, design and modernize the platform across the stack, and lead delivery of customer-facing features as Xe rebuilds its platform layer. You'll work in a small engineering team with direct access to product, design, and compliance, own architecture in your domain, lead design reviews, mentor mid-level engineers, and partner with architects and team leads on cross-domain decisions.
- Design and own features across the stack that move money and manage multi-currency balances across a range of domains, including onboarding, KYC and KYB, payment initiation, FX, settlement, and other supporting services.
- Lead delivery of customer-facing features that customers use every day, from the interface through to the services behind them.
- Own production health for your domain, including reliability, observability, on-call, and incident response.
- Lead cross-functional delivery with product, design, and compliance from problem framing through launch.
- Lead design reviews, set technical direction for your domain, and mentor mid-level engineers.
- Use agentic coding tools (Copilot, Cursor, Claude Code, or equivalent) daily across the SDLC, and lead modernization from legacy services into the modern stack alongside architects and team leads in your domain.
- 6 to 10+ years building production web applications, end-to-end.
- Strong frontend proficiency with Vue.js, React, or equivalent.
- Strong backend proficiency in C# / .NET preferred; other OOP languages welcome (Java, Kotlin, Go, or equivalent).
- Solid SQL and relational database fundamentals.
- Writing and maintaining tests as part of how you ship.
- Daily use of agentic coding tools (Copilot, Cursor, Claude Code, or equivalent) across the SDLC.
- Production experience on AWS, including hands-on deployment, CI/CD pipelines and modern deployment practices, and native services such as SQS, DynamoDB, S3, ECS, and Lambda.
- Strong system design and architecture experience, including service-oriented or microservices and event-driven patterns.
- Payments, FX, or regulated-industry experience.
- Track record of technical leadership: mentoring engineers, leading design reviews, and making architecture decisions in your domain.
- Strong communication and collaboration across engineering, product, and design.
- Frontend fundamentals: responsive design, accessibility, web performance, and internationalization.
- Experience leading front-end or platform modernization and migrations.
- Experience with caching solutions like Memcached or Redis.
- Experience using project management and documentation tools like Jira and Confluence.
- Knowledge of API testing tools such as Postman or Bruno.
- Writing automated tests alongside development with AI tools (Claude Code or equivalent).
- Competitive Salary \& Discretionary Bonus
- 23 days annual leave increasing with service (capped at 28 days)
- Paid day off for your Birthday
- 4% employer pension contribution
- Discounted Euronet ESPP
- Life Cover, Income Protection \& Critical Illness cover
- Healthcare
- Plumm Mental Health and Wellbeing
- Volunteering day for a charity of your choice
We want Xe to be a great place to work and to ensure that our communities are represented across our workforce. A vital part of this is ensuring we are a truly inclusive organization that encourages diversity in all respects.
Xe is an
Equal Employment Opportunity employer. All qualified applicants will be considered for employment regardless of age, national origin, race, color, disability, religion, sexual orientation, gender identity or expression, or any other characteristic protected under applicable law.
We are committed to providing reasonable accommodations to qualified individuals with disabilities. If you need assistance or an accommodation due to a disability, you may contact us at hr@unitedstatesdigital.space.
The position responsibilities outlined above are intended to define the general contents and requirements to perform this job. It is not to be taken as a complete statement of responsibilities or requirements. This job description does not restrict the Company's right to assign or reassign duties and responsibilities to this job as needed.
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