Founding Senior Software Engineer

Compensation: 70K-100K €
Location: Barcelona/Remote
Tech Stack: Python, Java, TypeScript, React/React Native, AWS

About the Role

As a Founding Engineer at Front Street, you’ll work directly alongside the Senior Director of Engineering to bring our mobile-first and browser extension companion to life. You’ll be a builder at heart, comfortable working across the stack, excited to own features from ideation to deployment, and motivated by the opportunity to shape the product and company from day one.

This role is ideal for an engineer who thrives in fast-paced environments, enjoys building clean and scalable systems, and wants to make an outsized impact early.

Why Join Front Street?

We’re building something meaningful, a companion app that empowers everyday users to better understand and engage with their financial world. As an early team member, you’ll have the rare opportunity to shape not just the codebase, but the entire company. If you’re ready to build boldly and move fast with purpose, we’d love to talk. Our founders previously built ADstruc/Project X in the US; scaled it to billions in transactions and were acquired by private equity.

Responsibilities

Build the Core Product

  • Ship production-grade features across backend systems using Python (FastAPI) and TypeScript (React/React Native)

  • Own major components of the MVP, including onboarding flows, financial data pipelines, and real-time user interactions

  • Contribute to the design of scalable APIs, mobile experiences, and internal tooling

Collaborate and Drive

  • Partner with the Senior Director and founding team to align engineering work with company priorities

  • Work closely with design and product to quickly iterate on user feedback and improve UX

  • Help establish development norms, testing practices, and lightweight processes that enable speed without sacrificing quality

Own and Scale

  • Participate in architectural decisions and code reviews

  • Help build our CI/CD pipelines, observability tooling, and developer workflows

  • Take initiative in identifying tech debt, bottlenecks, and areas for improvement

Requirements

  • 8+ years of experience as a full-stack or backend engineer

  • Proficient in Python, Java, and modern TypeScript (React or React Native preferred)

  • Strong product intuition and interest in creating polished user experiences

  • Familiarity with SQL (e.g. Postgres) and cloud platforms (e.g. AWS or similar)

  • Clear communicator with a bias toward action and ownership

Bonus

  • Experience in fintech, consumer apps, or real-time systems

  • Familiarity with authentication flows, payment APIs, or data privacy best practices

  • Desire to mentor future engineers and help shape a values-driven culture

Contact us: john@hifrontstreet.com