Senior Mobile Developer

For our client in the banking sector we are looking for a Senior Mobile Developer / Mobile Tech Lead – iOS & Android.

The consultant will be responsible for driving the UI uplift and modernization of the mobile banking applications while working hands-on with both iOS and Android development.

Key responsibilities include:

• Lead UI improvement initiatives, ensuring a modern, consistent, and user-friendly experience across mobile platforms.
• Design, develop, and maintain features for iOS and Android applications.
• Collaborate with designers, architects, developers, and business stakeholders to deliver high-quality solutions.
• Contribute to mobile architecture, technical design, and development best practices.
• Ensure high quality through code reviews, unit testing, UI automation, and continuous improvement activities.
• Take ownership of delivered solutions, including implementation, testing, deployment, and production support.
• Support the team in end-to-end deliveries, including frontend and backend contributions when needed.
• The consultant is expected to combine technical leadership with hands-on development and play a key role in improving the user experience of digital banking services.

Must-have knowledge and experience:

• 7+ years of professional experience in mobile application development with a proven track record of delivering large-scale mobile solutions.
• Strong expertise in either iOS (Swift) and/or Android (Kotlin), combined with strong hands-on experience in the other platform.
• Experience leading or driving UI modernization, redesign, or uplift initiatives in mobile applications. - Strong knowledge of mobile architecture patterns such as MVVM, VIPER, or similar.
• Experience with UIKit, Auto Layout, Jetpack Compose, XML layouts, and Fragments.
• Strong understanding of unit testing, UI test automation, and quality engineering practices on mobile platforms.
• Experience integrating and consuming REST APIs, asynchronous programming, and background processing.
• Experience working with secure, high-quality, customer-facing applications where performance, stability, and security are critical.
• Ability to drive technical discussions, collaborate with designers and stakeholders, and take ownership of end-to-end deliveries.
• Strong communication skills and experience working in agile cross-functional teams.

Nice-to-have knowledge and experience:

• Banking, payments, or financial services experience.
• Experience with design systems, accessibility, and mobile UX best practices.
• Knowledge of web technologies such as Angular, TypeScript, and JavaScript.

Answer these questions separately in a few sentences and attach them to your application! (Mandatory!)

• Do you have 7+ years of professional experience in mobile application development?*
• Do you have strong professional experience in either iOS (Swift) or Android (Kotlin), as well as hands-on development experience with the other platform?*i
• Have you led or played a key role in a mobile UI modernization, redesign, or uplift initiative?*
• Do you have hands-on experience with both iOS UI technologies (UIKit/Auto Layout) and Android UI technologies (Jetpack Compose/XML)?*
• Do you have experience with mobile unit testing and UI test automation in production applications?*

Please apply with your updated CV in English, that clearly demonstrates your skills and experience relevant to this role. We offer continuously, which means that we sometimes remove the assignments before deadline. If you are interested, we recommend that you apply immediately.

Location: Helsinki, Finland (hybrid) (Only for candidates residing in Finland)
Allocation: 100 %
Start date: 15.10.2026
End date: 15.4.2027, possible extension
Language: Fluent in English

We offer you: We offer a versatile assignment where every day is different and interesting. We also offer a very competitive salary and good employee benefits.

Are you interested in becoming a part of our dynamic team? The position will be filled as soon as a suitable person is found, so please be quick and submit your application!

Please include your salary expectation in your application. For more information, contact Kimmo Kärsämä, tel. 050 412 7500, kimmo.karsama@lokki.fi <mailto:kimmo.karsama@lokki.fi>

Explore Lokki, through our blog and website: https://www.lokki.fi/ <https://www.lokki.fi/> .

Lokki Henkilöstöpalvelut Oy (Finnish for Seagull Recruitment Services) has been active in providing recruitment services since 2005 and we belong to The Private Employment Agencies Association HPL. Our vision is to provide the best customer experience with our reliable, humane and effortless service around Finland. Our most important asset is a person who, as we know, thrives in a reliable and supportive atmosphere. At Loki you will be supported by your own human resources consultant throughout your employment relationship. At Lokki, we believe in a partnership achieved as a result of flexible service. Explore us and our vacancies: https://www.lokki.fi/.

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