[Hiring] Senior Android Developer @Joom

Role Description

We are looking for a Senior Android Developer to join the Onfy team — someone with deep Android expertise who can own complex technical areas, make strong architectural decisions, and actively contribute to product discussions.

• Main focus of the role is Android development.
• Experience with iOS would be a strong advantage.
• Experience with web development or interest in growing beyond Android would also be a plus.
• We actively use AI in our engineering workflows and welcome candidates who thoughtfully apply AI tools to improve development speed, quality, and decision-making.

Tech stack:

• Language: Kotlin
• UI: Jetpack Compose
• Architecture: MVI
• Navigation: Decompose
• Async: Kotlin Coroutines

• Develop and evolve the Android project architecture.
• Design client-side APIs and integrations with backend services.
• Build and improve product features in checkout, payments, delivery, post-purchase experience, refunds, and returns.
• Participate in product discussions, feature design, and experiment launches.
• Work closely with product managers, designers, QA engineers, analysts, and backend developers.
• Maintain and improve code quality, modularization, and automated tests.

Qualifications

• Strong experience with Android development and Kotlin.
• Solid understanding of Jetpack Compose.
• Experience building client–server applications.
• Experience with Kotlin Coroutines.
• Experience with Gradle and modularized projects.
• Ability to design maintainable architecture and make pragmatic technical decisions.
• Product-oriented engineering mindset: ability to understand user problems, think beyond implementation, and contribute to product decisions.

Requirements

• Experience with iOS development.
• Experience with web development.
• Interest in growing as a T-shaped engineer beyond Android.
• Professional use of AI coding tools such as Cursor, Claude Code, or similar.
• Ability to evaluate AI-assisted workflows: what worked, what did not, and why.
• Experience with product experiments, retention-focused features, or user-facing product improvements.

Benefits

• Fully remote or hybrid format (Berlin or Lisbon office).
• Permanent employment contract (Germany or Portugal) or Contract-based collaboration (full-time).
• Transparent growth framework: we define growth expectations together and set goals that align with them.