Staff Backend Engineer - UI Platform

United States Digital Space LLC; Barcelona; Presencial; EUR 120.000 - 170.000; Jornada completa

Descripción de la vacante

United States Digital Space LLC is seeking a Staff Software Engineer for the UI Platform team, Sail. You will shape technical direction, combine hands-on engineering with leadership, and collaborate with backend engineers and cross-functional partners to deliver platform capabilities that unify user interfaces.

You will define cross-team strategy, lead scalable backend services, build reusable platform components, and mentor engineers to raise quality across dashboards, mobile apps, and APIs.

Formación

• This is a staff-level role with 10+ years of experience building complex, reliable, scalable APIs or distributed systems.
• Experience leading technical design and delivery of large projects across multiple engineering teams.
• Ability to set technical direction and translate strategy into an executable roadmap.
• Ability to communicate technical decisions and tradeoffs with engineering, cross-functional partners, and senior leadership.

Responsabilidades

• Define cross-team technical strategy, architecture, and multi-year roadmap for the backend services powering merchant-facing experiences.
• Lead design and delivery of scalable backend services for a consistent foundation across Dashboard, mobile apps, and other interfaces.
• Build reusable platform capabilities to help product teams develop, operate, and improve their products.
• Partner with engineers, product managers, and designers to connect design system, SDKs, APIs, and backend services.
• Provide hands-on technical leadership through architecture reviews, guidance, and mentorship to raise team quality.

Conocimientos

APIs

Distributed systems

Technical leadership

Roadmapping

Backend services

Communication with leadership

Descripción del empleo

Who we areAbout the company

the company is a financial infrastructure platform for businesses. Millions of companies—from the world’s largest enterprises to the most ambitious startups—use the company to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone’s reach while doing the most important work of your career.

About the team

The UI Platform team, known as Sail, builds the foundations that support the company’s Dashboard and many of the company’s other user interfaces. The Sail Services team provides backend-for-frontend services that help product teams build consistent, scalable user experiences.

The team is defining its mission, roadmap, and technical vision as the UI platform takes on a more central role in how the company builds user interfaces. We work with engineers, product managers, and designers across the company to connect the design system, software development kits, and backend services into a consistent, surprisingly delightful user experience.

What you’ll do

As a Staff Software Engineer on the UI Platform team, you’ll help shape the technical direction for the services that support the company’s user interfaces. You’ll combine hands‑on engineering with technical leadership, working with backend engineers and cross‑functional partners to deliver platform capabilities that help the company build consistent, reliable user experiences.

Responsibilities

• Define a cross-team technical strategy, architecture, and multi-year roadmap for the backend services that power the company’s merchant-facing experiences
• Lead the design and delivery of scalable backend services that give product teams a consistent foundation for building reliable user experiences across the Dashboard, mobile applications, and other interfaces
• Build reusable platform capabilities that help product teams develop, operate, and improve their products with confidence
• Partner with engineers, product managers, and designers to connect the design system, software development kits, APIs, and backend services
• Provide hands‑on technical leadership through architecture reviews, technical guidance, and mentorship, raising the quality and effectiveness of the team’s work

Who you are

We’re looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement.

Minimum requirements

• This is a staff-level role, which typically means 10+ years of experience building complex, reliable, scalable APIs or distributed systems
• Track record of leading the technical design and delivery of large projects across multiple engineering teams
• Experience setting technical direction and translating strategy into an executable roadmap
• Demonstrated ability to communicate technical decisions and tradeoffs with engineering, cross‑functional partners, and senior leadership

Preferred qualifications

• Experience building backend-for-frontend systems or frontend platform services
• Experience working on developer platforms, design systems, or UI infrastructure
• Experience using agentic development workflows to improve engineering productivity
• Experience with feature flagging, experimentation, telemetry, or analytics systems