Senior Android Developer at Onfy at SIA Joom in Berlin, DE

We are Onfy — a German pharmacy marketplace founded in 2021. We are on a mission to constantly find new and innovative ways to support your health online. We empower our customers to take their health into their own hands by providing an easy, convenient and affordable experience.

Our website www.onfy.de launched in November 2021, and since then it has developed into an online platform that offers consumers the unique ability to order and to receive health products from several pharmacies at once with low prices and fast delivery. We are an agile, rapidly growing team of forward thinkers, and we believe in people who want to change the world of health for the better using the latest technology available.

We continue to evolve our app, making it more advanced, reliable, and engaging for users. 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.

The main focus of the role is Android development. At the same time, we value T-shaped engineers: experience with iOS would be a strong advantage, and 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

Responsibilities

• 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

Requirements

• 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

Preferred

• 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

We offer

• 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

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