Fullstack Software Engineer (Core Billing Platform)

TL;DR

Fullstack Software Engineer (Core Billing Platform): Build the core billing engine processing thousands of transactions daily with an accent on modular primitives, multi-country regulations, and high-volume scalability. Focus on designing distributed systems, integrating payment gateways and partner APIs, and automating workflows across regions.

Location: Anywhere in France, Belgium, Spain. Flexible office & remote options.

Company

Vertically integrated health partner uniting insurance and smart healthcare delivery into one seamless system for companies across France, Spain, Belgium, and Canada.

What you will do

• Build the core billing engine to process thousands of transactions daily with precision and reliability.
• Design modular, reusable billing primitives and abstractions that scale across products and regions.
• Integrate with payment gateways, partner APIs, and internal systems.
• Automate billing schedules and workflows across multiple countries.
• Ensure system reliability, accuracy, and operational excellence.
• Collaborate with product, design, and operations teams to create a unified platform.

Requirements

• Backend / full-stack experience (all experience levels considered).
• Passionate about navigating complex business logic and system dependencies.
• Experienced with scalable, resilient platform design.
• Well-versed in OOP languages (Python, Java, C#).
• Fluent in English (French is a plus).
• Curious, self-starting, humble, collaborative, and eager to grow.

Culture & Benefits

• Mission-driven with leadership principles: Mission is the Boss, Distributed Ownership, Radical Transparency, Always Growing.
• Fair rewards & equity packages.
• Top-tier equipment: MacBook Pro, monitor, noise-canceling headphones.
• Flexible vacation & hours, comprehensive healthcare for you, children, and partners.
• Transport support, coaching for personal growth, training budget for conferences, courses, books.
• Extended parental leave for all parents.