Senior Full-Stack Kotlin Engineer (AI)

TL;DR

Senior Full-Stack Kotlin Engineer (AI): Building and optimizing next-generation AI-powered web application platforms with an accent on LLM-driven code generation, distributed systems, and multi-tenant data models. Focus on architecting resilient microservices, developing React/TypeScript frontends, and driving performance tuning across the platform.

Location: You can work from Amsterdam, Netherlands; Berlin, Germany; Munich, Germany, or remotely from Germany.

Company

hirify.global is a product company building Kineto, a next-generation platform for generating, deploying, and operating AI-powered web applications.

What you will do

• Design, implement, and evolve Kotlin and Spring Boot microservices for generation, hosting, deployments, billing, and analytics.
• Build resilient distributed systems running on GKE, Knative, Flux, Helm, Terraform, and Terragrunt.
• Architect and optimize multi-tenant data models on Neon and Postgres.
• Develop user-facing features for the Kineto app builder using React and TypeScript.
• Drive performance tuning across the platform and solve operational challenges like scale to zero, cold starts, and autoscaling.
• Build and improve the LLM-based generation pipeline that produces thousands of Node.js, Kotlin, and Spring Boot applications.
• Own major architectural roadmap items, including multi-region deployments and advanced billing, and mentor other engineers.

Requirements

• 5+ years of experience building commercial software in Kotlin, Java, Swift, or similar languages.
• Solid grasp of algorithms, data structures, concurrency, and design principles for large-scale, maintainable codebases.
• Proven expertise or a strong interest in AI-assisted development, prompt engineering, or ML-based code generation workflows.
• Thrive in cross-functional teams across time zones and excel at communicating complex ideas clearly.
• English: B2 required.

Nice to have

• Experience with cross-platform frameworks and iOS and Android app development.
• Familiarity with Compose Multiplatform, building KMP libraries or frameworks, or experience in IDE/plugin development.

Culture & Benefits

• Collaborate with product, design, and infrastructure teams to define the long-term vision.
• Opportunity to mentor other engineers and raise engineering quality in the team.
• Work with cutting-edge technologies like LLM-driven code generation and distributed systems.
• Be part of a rapidly growing team shaping the architecture and leading platform initiatives.
• Work in cross-functional teams across time zones.