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.
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.




4+ years of experience developing with Ruby on Rails in production environments.
~ 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.
~ English proficiency, as technical documentation, standards, and specifications are primarily in English.
~ Knowledge of Redis and caching strategies.
Experience with observability tools: logging, monitoring, metrics, alerting.
Understanding of security best practices for APIs (auth, data protection, auditability).
Experience working in high‑availability / high‑throughput backend environments.
Experience integrating with government tax authority systems (clearance/reporting models).
Exposure to European and integral digital transformation projects, working with international e‑invoicing standards and integrations with tax authorities.
Our cloud‑based platform helps companies connect with public ad

📌 Software Developer .Net Remote (Barcelona)
🏢 B2Brouter
📍 Barcelona