Mid-Level Backend Developer - Genki

🌱 Genki means "healthy, energetic, and full of spirit". That's us.

We're a fully remote, profitable startup of about 25 people, five years in and growing steadily. We build tailored health insurance for long-term travelers like digital nomads, serving over 75,000 people in 200 countries.

We're looking for a Mid-Level Backend Developer to help build and evolve the core system that powers our products and operations. You'll join as the second developer in our backend team, reporting to our Lead Backend Developer.

What You'll Do

• Build new features, improve testability and reliability, and help evolve the architecture over time.
• Work within a complex product spanning multiple domains, building deep understanding quickly and making decisions with incomplete information.
• Leverage AI-agentic development tools as part of a fast-moving workflow.
• Read existing code, ask questions, and navigate a custom framework built around event sourcing.

Requirements

• Experience working on larger backend systems in production and understanding their inherent complexity.
• Ability to ramp up quickly on complex product domains and business logic.
• Comfort with event sourcing, event-driven architecture, or similar patterns.
• Strong focus on code quality: readable code, meaningful tests, and clean APIs.
• Hands-on experience with AI-agentic development tools (such as Claude Code or Codex) and a genuine drive to go deeper.

Current Tech Stack

• Language: Kotlin with coroutines
• Framework: Custom framework built around event sourcing
• Billing: Stripe
• Infrastructure: Heroku (migrating to Railway)
• AI-Agentic Development: Claude Code with custom plugin
• APIs: GraphQL

Working Style

• High attention to detail and pride in execution.
• Curious, self-driven approach to digging into unfamiliar code and figuring things out.
• Desire to understand why something works rather than just making it work.
• Comfortable making decisions with partial information.
• Startup or scaleup experience, comfortable with pace and ambiguity.
• Thrives in a fully remote, async-first team with clear written communication.

Benefits & Perks

• Up to 5,000 EUR/month (depending on experience)
• Employee equity participation through a vesting program
• Fully remote setup — live as a digital nomad from anywhere in the world
• Flexible working hours in a startup atmosphere
• Company-issued and managed MacBook, plus a desk in your favorite co-working space
• 25 days paid annual leave
• Regular team off-sites to connect in person