Senior Native Mobile Developer – iOS & Android (Retail)

About the role

Reaktor's tech community is looking for an experienced Senior Native Mobile Developer to join our Retail Business Unit in our European locations (Helsinki, Amsterdam, Lisbon). You will work on native iOS and Android applications, delivering polished UI experiences and collaborating with clients and multidisciplinary teams.

Key responsibilities

• Develop native mobile applications for both iOS and Android.
• Build polished mobile UI experiences, including high‑performance animations.
• Work on mobile SDKs, integrations, analytics, ads, or attribution frameworks.
• Collaborate with clients and stakeholders to clarify requirements and drive initiatives.
• Contribute to architectural decisions and long‑term technical direction.
• Participate in discovery, concepting and iterative delivery.
• Take ownership of testing, debugging, monitoring, troubleshooting and production quality.
• Occasionally contribute beyond mobile to backend, API or cloud infrastructure when needed.

Required profile

• Strong experience in native iOS development using Swift and/or Objective‑C.
• Strong experience in native Android development using Kotlin and/or Java.
• Testing ownership mindset – responsible for the full development cycle.
• Experience with production app monitoring and troubleshooting.
• Proven ability to engage with multiple stakeholders to solve ambiguous problems.
• Fluent verbal and written English.

Required skills

• Swift
• Objective‑C
• Kotlin
• Java

What we offer

• Ability to impact how you work – choose approaches, technologies and methodologies.
• Supportive community and considerate, experienced team.
• Sustainable work‑life balance with perks such as free moving day, car share, sick‑child care and private‑event office space.
• Internal training courses, community events and 15‑minute coffee breaks for tech discussions.
• Opportunities for extended academy‑like studies such as Cloud Academy.
• Access to 300+ hobby clubs supported by Reaktor Diversity, equity and inclusion initiatives.