Mid-Level Backend Developer

Genki

Mid-Level Backend Developer joining a remote team building health insurance systems for digital nomads. Evolving core architecture using Kotlin and event-driven patterns.

Posted 5/18/2026full-timeRemote • 🇩🇪 GermanyMid-LevelSenior💰 €5,000 per monthWebsite

Tech Stack

Tools & technologies

GraphQLHerokuKotlin

About the role

Key responsibilities & impact

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.
Our backend runs on Kotlin with a custom framework built around event sourcing.
You'll need to be comfortable reading code, asking questions, and finding your way through a system that's still being shaped.
You'll build new features, improve testability and reliability, and help evolve the architecture over time.
You'll need to build deep understanding quickly and be comfortable making decisions with incomplete information.
We're moving fast, increasingly with AI-agentic development tools. You should have some hands-on experience with these tools and a genuine drive to go deeper.

Requirements

What you’ll need

**Experience**
- You've worked on larger backend systems in production and understand the complexity they bring.
- You've worked in complex product domains and can ramp up quickly on business logic that isn't always obvious.
- You're comfortable with event sourcing, event-driven architecture, or similar patterns.
- You care about code quality: readable code, meaningful tests, and clean APIs.
- You have some experience with AI-agentic development tools (Claude Code, Codex, or similar) and want to go deeper.
**Our current tech stack**
- Language: Kotlin with coroutines
- Framework: Custom, built around event sourcing
- Billing: Stripe
- Infrastructure: Heroku (migrating to Railway)
- AI-agentic development: Claude Code with custom plugin
- APIs: GraphQL
**Working style**
- You pay close attention to the details and take pride in getting them right.
- You're curious and self-driven. You dig into unfamiliar code, ask good questions, and figure things out.
- You'd rather understand why something works than just make it work.
- You're comfortable making decisions when not all the information is there yet.
- You've worked in a startup or scaleup and know what that pace and ambiguity feels like.
- You thrive in a fully remote, async-first team and know how to communicate clearly without meetings for everything.
- You're as open to different ideas, opinions, and to people with different cultures, backgrounds, and interests as we are.

Benefits

Comp & perks

💰 Up to 5,000 EUR/month (depending on experience) with employee equity participation through a vesting program
🏝 Fully remote, from anywhere in the world & live as a digital nomad if you want to (the country list above are just examples)
🕗 Flexible hours, startup atmosphere
🌍 Most of the team is in Europe and Southeast Asia, with a few hours of daily overlap around German business hours
💻 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

ATS Keywords

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Hard Skills & Tools

Kotlinevent sourcingevent-driven architecturecoroutinescode qualityAPIsGraphQLAI-agentic development toolsClaude CodeCodex

Soft Skills

attention to detailcuriosityself-drivenproblem-solvingdecision-makingcommunicationadaptabilityteam collaborationopen-mindednesspride in work