Senior Backend Engineer – Ruby on Rails

Global Changer

Senior Backend Engineer - Ruby on Rails developing a SaaS B2B platform that helps organizations reduce emissions. Focused on backend architecture and domain modeling in corporate emissions accounting.

Posted 5/19/2026full-timeRemote • 🇩🇪 GermanySenior💰 €80,000 per yearWebsite

Tech Stack

Tools & technologies

PostgresRubyRuby on Rails

About the role

Key responsibilities & impact

Shape the backbone of our Corporate Carbon Footprint (CCF) module
Backend architecture and domain modeling for the CCF module for Scope 1, 2 and 3, emission factor matching, calculation engines and reporting flows
Scalability and performance of data-heavy workflows handling millions of activity data points across complex customer organisations
Setting technical direction for the Rails codebase and its long-term evolution service boundaries, data model, API surface
Technical excellence across the squad: clean code, deliberate test pyramid, thoughtful API design, disciplined handling of technical debt
Knowledge exchange and code quality through reviews, pairing and architectural discussions that level up everyone around you

Requirements

What you’ll need

7+ years of experience in backend software development with battle-proven Ruby on Rails expertise
Expert-level Ruby on Rails
Deep experience with Postgres at scale: schema design, query optimisation, indexing strategy, migrations on live data
Track record of designing and evolving backend systems in data-heavy production environments
Fluent in English, clear written and verbal communication (German is a plus)
You live in the EU (CET ±1) with a valid work permit
You are passionate about the fight against the climate crisis and creating customer-oriented solutions that deliver real added value.

Benefits

Comp & perks

Creating long-lasting software with a positive impact - we are here to stay
Play a decisive role in shaping our product and corporate culture
A mission that drives us every day
Fair compensation (first order of magnitude: around € 80.000 gross depending on experience)
28 vacation days and flexible vacation planning (you don't have to plan your entire vacation at the beginning of the year)
Flexible working hours - family-friendly :)
100% remote is possible - work from your preferred location
Freedom to contribute to the open source community
Teamevents

ATS Keywords

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Hard Skills & Tools

Ruby on RailsPostgresschema designquery optimisationindexing strategymigrationsbackend software developmentAPI designdata modelingemission factor matching

Soft Skills

clear communicationwritten communicationverbal communicationknowledge exchangecode qualitycollaborationtechnical directionleadershipproblem-solvingpassion for climate crisis