Backend-Focused Fullstack Developer (Kotlin/Spring + AI)

Ahoi Kapptn; Linz; Hybrid; EUR 40,000 - 48,000; Full time

Benefits offered by this job

Flexible hours & home office

Daily Lunch & Snacks

Bonus system

State-of-the-art Setup

Fitness & sport

Job summary

Ahoi Kapptn is seeking a Fullstack Developer with a backend focus to design and implement scalable APIs using Kotlin and Spring, backed by MongoDB. You will explore AI-assisted code generation, validate architectures, and own backend quality while collaborating across disciplines.

Hybrid work in Austria with flexible hours and home office. Experience with Docker, CI/CD, and cloud infra is a plus. Proactive, English/German communication and a drive to own technical outcomes are expected.

Qualifications

• In-depth knowledge of Kotlin, the Spring Framework, and MongoDB.
• Deep understanding of common patterns, API standards, and modern architectures.
• Confident use of AI coding tools such as Claude Code.
• Ambition to think beyond the backend and assume technical ownership.
• Ability to critically validate AI-generated architectures and logic.
• Communicative, team-oriented, and open to new tech stacks.

Responsibilities

• Develop new APIs with Spring & Kotlin and design database solutions with MongoDB.
• Orchestrate AI agents for automation of code generation and refactoring.
• Integrate LLM interfaces into scalable backend services.
• Architect, unit test, and document using Swagger.
• Continuously optimize developer experience via AI workflows.
• Collaborate with design/PM for cross‑platform solutions and ensure performance.

Skills

Kotlin

Spring Framework

MongoDB

AI tooling

Architectural thinking

Team collaboration

German or English

Tools

Docker

GitLab CI/CD

Postman

Claude Code

AWS

DigitalOcean

Bruno

Job description

Ahoi Kapptn is seeking a Fullstack Developer with a backend focus to design and implement scalable APIs using Kotlin and Spring, backed by MongoDB. You will explore AI-assisted code generation, validate architectures, and own backend quality while collaborating across disciplines.

Hybrid work in Austria with flexible hours and home office. Experience with Docker, CI/CD, and cloud infra is a plus. Proactive, English/German communication and a drive to own technical outcomes are expected.