Mobile Developer

About the role

Reaktor's tech community is looking for an experienced Senior Native Mobile Developer to join our Gaming & Entertainment Business Unit in Helsinki.

If you thrive in native mobile development, enjoy solving complex challenges in multidisciplinary teams, and are curious to work in a low-hierarchy environment, you might just be what we’re looking for.

You will join our Gaming & Entertainment Business Unit, where you will support clients in this domain across both iOS and Android native mobile development.

Your daily tasks may include:

- Developing native mobile applications for both iOS and Android

- Building polished mobile UI experiences, including high-performance animations

- Working on mobile SDKs, integrations, analytics, ads, or attribution frameworks depending on the client project

- Collaborating with clients and stakeholders to clarify requirements, autonomously driving initiatives across the client organization and guiding technical and business teams in selecting the right technologies for their needs.

- Contributing to architectural decisions and long-term technical direction

- Participating in discovery, concepting, and iterative delivery — not just implementation

- Taking ownership of testing, debugging, monitoring, troubleshooting, and production quality

- Occasionally contributing beyond mobile when the project benefits from backend, API, or cloud infrastructure understanding

To thrive in this position, you’ll need:

Must-haves

- Strong experience in native iOS development using Swift and/or Objective-C

- Strong experience in native Android development using Kotlin and/or Java

- A testing ownership mindset - you take responsibility for the full development cycle, from implementation to ensuring features are defect-free and shipped to users

- Experience with production app monitoring and troubleshooting

- Experience engaging with multiple stakeholders to solve challenging, ambiguous problems

- Fluent verbal and written English to collaborate in an international environment

We notice that it usually takes several years of professional experience to build this level of depth across both mobile ecosystems.

Nice-to-haves

- Experience with SwiftUI and/or Jetpack Compose

- Experience with reactive programming

- Experience with Flutter

- Experience with C++

- Familiarity with backend development, APIs, databases, or cloud infrastructure

- Interest in building polished animations and working closely with Motion Designers

- Finnish language skills

Adaptability

Willingness to work in a hybrid setup. This means balancing office, client premises, and remote work.

WHY JOIN US?

For two decades, we’ve been developing qualities and capabilities for adapting, reacting, and supporting change – building Reaktor to hold up in a fast-paced environment while ensuring the well-being of our people.