Senior Backend Developer (m/w/d)

The client is looking for an experienced Backend Developer to join the founding team in building a cloud cost optimization platform.

You'll architect and build the core backend systems that power our cloud cost optimization platform from day zero. Starting with our initial monolithic web application, you'll design the multi-tenant database architecture, build robust APIs for our web dashboard, and create the AWS interfacing layer that pulls invoices, costs, and reports for automated savings plan management.

Your immediate focus: Build the backend for our 1-click AWS connection flow, design the database schema for multi-tenancy, and create the API architecture that serves our web dashboard. You'll also build the backend logic for our AI DevOps agent with features like automated server scheduling and AWS invoice processing.

You'll own critical architectural decisions that scale from startup to enterprise. You'll work directly with AWS APIs, design the testing framework with high coverage, and implement CI/CD principles from day one to ensure seamless deployment and high uptime.

What you bring

* Expert Python developer with deep FastAPI experience for building our monolithic web server and API architecture
* Multi-tenant database design experience with PostgreSQL/MySQL for storing organizations, AWS stats, and reporting data
* AWS API integration including billing APIs, CloudFormation, cross-account roles, and invoice processing
* Authentication systems experience with email signup flows, OAuth, and multi-platform security (AWS, Slack)
* Startup experience having built 0→1 products with rapid iteration and autonomous execution
* You are a curious builder, who loves getting to the bottoms of things, with a hacker mindset to just try things out

* You are a hard worker with a strong sense of urgency, who takes ownership and fosters a fast-moving, high-responsibility environment
* You value direct communication to increase speed and as a way to improve yourself and your colleagues
* You have impressive achievements from previous jobs and from side projects