Role Overview
We’re looking to bring a Software Developer (Electronic Invoicing) to join a small, technically focused team building and maintaining a B2B electronic invoicing platform. We work with international standards and integrate with national tax systems worldwide. In this role, you’ll take end-to-end ownership of backend systems — from design and implementation to production operations.

About B2Brouter
B2Brouter is a leading European provider of electronic document exchange solutions, specializing in e-invoicing, e-procurement, and B2B data integration. We help companies automate, secure, and optimize their electronic transactions through reliable, scalable, and compliant digital platforms.

Key Responsibilities

Design, build, and maintain REST APIs for invoice processing, document exchange, and third-party integrations.

Develop and manage asynchronous processing pipelines using background jobs and queue systems.

Build and maintain integrations with external platforms, including government tax authorities and document exchange networks.

Optimize database queries,



ensure data consistency, and manage concurrency in high-throughput environments.

Participate in code reviews, technical discussions, and contribute to backend architecture decisions.

Support production operations, including incident response, monitoring, and troubleshooting.

Write and maintain technical documentation (systems, APIs, integration specs, and operational runbooks).

Required Skills & Qualifications

4+ years of experience developing with Ruby on Rails in production environments.

Strong experience designing and maintaining RESTful APIs.

Hands‑on experience with background job/queue systems and asynchronous workflows.

Solid SQL knowledge and experience in database performance tuning & optimization.

Comfortable working with XML-based formats and transformations (e.g., XML, XSLT) as well as JSON.

Proven ability to work with third‑party integrations and external dependencies.

E

📌 Software Developer (Madrid)
🏢 B2Brouter
📍 Madrid