Job Description

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.

• English proficiency, as technical documentation, standards, and specifications are primarily in English.

• Familiarity with modern development workflows: Git and CI/CD.

Valuable / Nice-to-Have Skills

• 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 in electronic invoicing standards and structured formats (e.g., UBL, CII, Factur-X/ZUGFeRD, etc.).

• Experience integrating with government tax authority systems (clearance/reporting models).

What We Offer

• Opportunity to work in a fast-growing international SaaS company, building a product used by businesses across multiple markets.

• Exposure to European and global digital transformation projects, working with international e-invoicing standards and integrations with tax authorities.

• A collaborative, innovative, and supportive team culture, with strong technical ownership and knowledge sharing.