Senior Backend Developer | Java/Kotlin | High-Traffic Platform | Frankfurt | 75.000 EUR

Senior Backend Developer | Java/Kotlin | High-Traffic Platform | Frankfurt | 75.000 EUR

The Role

We are looking for a Senior Backend Developer to join our Frankfurt-based team. This is a role for a "developer's developer" - someone who loves the craft of coding, understands the intricacies of microservices, and is excited about using AI to push the boundaries of engineering productivity.

The Mission

You will be responsible for the core backend services of a high-traffic platform. This isn't about managing people; it’s about designing robust systems, solving complex technical puzzles, and ensuring the stability of real‑time gaming sessions.

What you’ll do

• Develop: Build scalable services using Java, Kotlin, and Spring Boot.
• Optimize: Manage high‑concurrency data with RabbitMQ and Redis.
• Innovate: Integrate AI‑powered tools (Cursor, Copilot) into your workflow to accelerate delivery and maintain architectural integrity.
• Scale: Take ownership of core platform components like wallets, payments, and integrations.

What we’re looking for

• Senior Expertise: Deep professional experience with Java/Kotlin and Spring Boot.
• System Design: Strong understanding of Microservices, SQL optimization (PostgreSQL/MySQL), and message brokers.
• AI Fluency: You are already using AI assistants to write better code, faster.
• Location: You are based in or willing to commute to Frankfurt at least 3 days a week.

Why join?

• Impact‑driven culture: High autonomy, low bureaucracy.
• Work on a real‑time, high‑traffic product.
• A team that values technical excellence and "geek" culture.