Senior Native Mobile Developer - iOS & Android, Retail

Reaktor Group konserni; Helsinki; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Extensive health care

Hybrid work model

Parental leave support

Professional growth

Job summary

Reaktor Group konserni is seeking a Senior Native Mobile Developer to join our Retail Business Unit across Helsinki, Amsterdam, and Lisbon. You will deliver native iOS and Android apps, craft polished UI, and guide technical decisions with clients and internal teams.

You will own testing, monitoring, and quality, participate in discovery, and shape long-term technical directions while collaborating across a multinational environment. Hybrid work supported in Helsinki.

Qualifications

• Extensive experience in native iOS development using Swift and/or Objective-C.
• Strong experience in native Android development using Kotlin and/or Java.
• Ownership of testing across the development lifecycle and shipping defects-free features.
• Experience with production app monitoring and troubleshooting.
• Ability to engage multiple stakeholders to solve complex problems in an international context.
• Fluent English, both written and spoken.

Responsibilities

• Develop native mobile applications for iOS and Android.
• Build polished UI experiences with high-performance animations.
• Work on mobile SDKs, integrations, analytics, ads, or attribution frameworks.
• Collaborate with clients and stakeholders to clarify requirements and steer tech decisions.
• Contribute to architectural direction and long-term technical strategy.
• Participate in discovery, concepting, and iterative delivery.
• Own testing, debugging, monitoring and production quality.
• Occasionally contribute beyond mobile to backend, API, or cloud topics.

Skills

iOS native

Android native

Testing ownership

Production monitoring

Stakeholder collaboration

English communication

Tools

SwiftUI

Jetpack Compose

Flutter

Job description

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).

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 Retail 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 distributing beta versions via App Store and Google Play

Experience with publishing apps via the App Store and Google Play

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

Interest in building polished animations and working closely with Motion Designers

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

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.

While working at Reaktor, we’ll provide you with:

The ability to impact how you work. Together with the client, your team chooses the approach, technologies, and methodologies you think will work best in any given situation

A community with as much support as your heart desires

A team that’s not only experienced but considerate as well – they all want you to succeed

A sustainable work‑life balance and support for your daily life outside of work. (e.g., free moving day, Reaktor car share, sick child care services, office space to use for your private events, etc.)

An opportunity to grow as a professional. In addition to the day‑to‑day work, we offer internal training courses, community events, and 15‑minute coffee breaks to discuss hot topics in tech and design

A possibility to take part in more extended academy‑like studies like Cloud Academy

300+ hobby clubs, from winter swimming and running to knitting and archery, that bring people together outside of (and sometimes inside) office hours. Many of these are supported by Reaktor

Diversity, equity, and inclusion

Together, we are committed to making Reaktor an environment that embraces and values all of our employees for the whole of who they are. We encourage applicants from all backgrounds to apply, knowing that studies show that members of underrepresented communities don’t apply for jobs unless they fully satisfy all of the requirements. If you’re thinking twice about applying for this reason, we invite you to send us your application anyway. You could be just the person we’re looking for. Read more about our DEI work here.

At Reaktor Helsinki, our benefits and perks evolve with our community, and we’re always open to new ideas that will support the wellbeing of Reaktorians. Currently, we offer the following perks:

Tools

We offer everyone a top‑spec computer and a phone of their choosing to work with and use at work and home. If you need other tools, like a keyboard or a mouse, we’ll figure it out, too!

Phone & internet

To keep you connected, we’ll cover an unlimited phone plan – and a proper internet connection to your home.

We offer the monthly lunch benefit in addition to your salary, which means you only pay the taxes.

Recreational benefit (sports & culture)

At Reaktor, the recreational benefit is an addition to your salary – and it’s tax‑free.

If you want one, we offer an optional commuting benefit card and a bicycle benefit.

Extensive occupational healthcare

Extensive occupational health care services include specialists’ appointments, operations, vaccinations, dental care, and mental health services, including e.g. psychotherapy.

Family support

We support all types of families with encouraging types of parental leave and more, offering support for child care.

An extensive insurance package

Our extensive insurance package safeguards you for accidents, travel, and more.

Our subsidized massage deals keep those shoulders nice and loose.

The Juice-program enables you to work on open source projects – and get compensated for it!

We’re an equal opportunity employer

All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.

FAQ

01 What are we looking for?

We believe there’s more that matters than just the resume. We’re looking for an exciting overlap of curiosity, creativity, people skills, and experience: people who are willing to learn, participate, and share new perspectives.

02 What does the hiring process look like?

We take the time to learn about your skills and aspirations and help you learn about ours. Our interview process usually involve three or four conversations over the course of a few weeks. From application to closing, our process takes about four weeks. Your recruiter will keep you up to date on what to expect from each stage of our interviewing process.

03 What kinds of projects do you have?

We do a variety of different kinds of projects, with the aim of each being meaningful and critical to a client’s business. Our typical engagements are from 6 months to 18 months and involve between 3-6 Reaktorians collaborating closely with our clients. When it comes to picking and choosing, we look at a number of things from the business side. For example, we tend to be interested in the multi-functional growth potential of the project as well as the technological and digital maturity of the client, their product, and the project overall. However, not all good business is a good fit for us culturally. We only take on new business that aligns with our values, is interesting for our people to work on, and has a great local or global impact.

The core idea behind how we staff is that you will never be alone in a project. When staffing our projects, we first start by going through your preferences and ambitions for learning, be it customer location, the field of business, or some particular technology. We then go through your learning and self‑development targets and do our best to match all of the above to a project. We get multiple projects and new openings in existing projects each month. If there isn’t a perfect fit immediately, we try to find a spot for you in an existing project or take some time while you work on internal projects, or get deeper into onboarding.

05 What do people do in between projects?

Client work is our number one priority, but we’ve gotten pretty good at making the most out of the normal in‑between time in the consulting business. Maybe you’ve just joined us, your project has just ended, or you’re rotating out of one and looking for new opportunities, it can sometimes take a while to find the next client project. These are great opportunities to take training, dive into a new topic, or help out with internal development. Your time in between projects does not affect your pay.

06 Is it ok to work remotely?

It depends on the project in question, as we choose the option that fits best with each client. Sometimes projects are multisite, at other times, there are more on‑site visits, and on rather rare occasions, we are 100% remote. That said, we love to see each other every once in a while and spend time together at get‑togethers and occasional in‑person meetings.