Senior Backend Engineer - Ruby on Rails (m/f/d)

• Own backend services in the Rails codebase end-to-end, from data model over API to background processing.
• Drive architectural decisions for the Corporate Carbon Footprint (CCF) module, focusing on scalability and performance of data-heavy workflows.
• Translate product and domain requirements into robust technical solutions, setting technical direction for the Rails codebase.
• Lead by example on code quality via reviews, refactoring, and principled trade-offs around technical debt.

This role directly contributes to reducing corporate carbon emissions by building the backbone of a carbon accounting platform that helps large organizations measure and reduce their environmental footprint.

• 7+ years of experience in backend software development with battle-proven Ruby on Rails expertise.
• Expert-level Ruby on Rails and deep experience with Postgres at scale (schema design, query optimization, indexing strategy, migrations on live data).
• Track record of designing and evolving backend systems in data-heavy production environments.
• Fluent in English; valid work permit and residence in the EU (CET ±1).

• Fair compensation around €80,000 gross depending on experience.
• 28 vacation days, flexible vacation planning, and flexible working hours.
• 100% remote possible within the EU; freedom to contribute to open source.
• Team events and a mission-driven culture.

Global Changer is a SaaS B2B platform that helps companies reduce emissions faster through carbon accounting (Corporate Carbon Footprint and Product Carbon Footprint), using AI to improve data quality over time.