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# Fullstack Software Engineer - Core Billing Platform

- **Company:** Alan Sa.
- **Location:** Madrid, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Business Logic, Computing Platforms, C Sharp (Programming Language), Distributed Systems, Python (Programming Language), PostgreSQL, Payment Gateway, Oop Languages, ReactJS, Flask (Web Framework), Reliability of Systems, Backend, React Native
- **Published:** September 6, 2026
- **Apply:** https://www.buscojobs.com.es/fullstack-software-engineer-x-f-m-core-billing-platform-en-madrid-ID-369603930

## About the Role

Software engineers of all experience levels, ideally with backend/full?stack experience.
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 but not required).
Curious, self?starting, humble, collaborative, and eager to grow.

## Description

Design and own our billing platformAt Alan, billing is a critical platform powering all of our services across multiple countries.We turn complex rules, multi?country regulations, and high transaction volumes into scalable, reliable systems.ResponsibilitiesBuild the core billing engine: process thousands of transactions daily with precision and reliability.Design modular, reusable billing primitivesand abstractions that scale across products and regions.Integrate with payment gateways, partner APIs, and internal systems.Automate billing schedules and workflowsacross multiple countries.Ensure system reliability, accuracy, and operational excellence.Collaboratewith product, design, and operations teams to create a unified platform.Why this role is specialDesign Alan's core financial systemsand drive global expansion.Work on complex distributed systemspowering thousands of transactions daily.Influence platform design, architecture, and future scalability.Be part of a team that values engineering craftsmanshipand continuous improvement.Work in an environment where your ideas, designs, and decisions drive tangible outcomes.Your playgroundStack: Python/Flask, React, React Native, PostgreSQL.What you'll do: ship scalable, reliable systems and build the backbone of Alan's billing operations.Impact: your work directly unlocks new services, countries, and exciting deals, supporting their reliable operation.Who we're looking forSoftware engineers of all experience levels, ideally with backend/full?stack experience.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 but not required).Curious, self?starting, humble, collaborative, and eager to grow.Perks & BenefitsFair rewards & equity packages.Flexible office & remote options.Top?tier equipment: MacBook Pro, monitor, noise?canceling headphones.Flexible vacation & hours.Comprehensive healthcare for you, children, and partners.Transport support and coaching for personal growth.Training budget for conferences, courses, books.Extended parental leave for all parents.#J-*****-Ljbffr


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