iOS Developer - Native Mobile Platforms (Kotlin Multiplatform)
- Campus Amsterdam
- Medior
- 32 - 40 hours
- Expertise: Technology
- Skills: React Native, Swift, SwiftUI, iOS, CI/CD, Open Source, Microsoft Azure, TCA Architecture, Figma, Digital Design, Kotlin, Native app development, Nederlands
- Employment: Employed
- What you'll do
- Your qualities and skills as iOS Developer - Native Mobile Platforms (Kotlin Multiplatform)
- What’s in it for you
- Get to know iO
- What your colleagues say
- Your application, step by step
What you'll do
At iO Amsterdam, we build modern, scalable native mobile platforms for demanding clients in sectors including finance, healthcare and utilities. We combine true native quality with the efficiency of shared business logic via Kotlin Multiplatform (KMP). Think multi-label apps for multiple brands and countries, with security, compliance and performance as non-negotiable requirements.
To further develop this approach, we're looking for an experienced iOS developer who thrives on architecture, quality and modern mobile stacks – and who can strengthen our team with real technical depth.
How we work
Architecture-first: we build on a proven KMP foundation, with a large part of the fundamental mobile architecture already in place (auth, networking, storage, logging, testing);
Shared where it pays, native where it matters: business logic in Kotlin, platform-specific UX in SwiftUI/Compose;
Multi-label by design: new brands and variants are added through configuration, design systems and tooling – not copy-paste code;
Security by design: security & compliance are built into our components and pipelines from the start, not bolted on afterwards;
AI & automation: we invest in AI-assisted testing and smart tooling to deliver faster, more securely and more consistently;
As an iOS developer, you'll be one of the key figures putting this approach into practice and helping to refine it further.
What you’ll be doing
As an iOS Developer at iO, you will:
Build high-quality native iOS apps (Swift/SwiftUI) as part of our mobile platforms;
Work closely with Android, KMP and backend colleagues to combine a shared core (business logic in Kotlin) with a best-in-class iOS experience;
Help deliver multi-label solutions: one platform, multiple brands and countries, each with their own look & feel and functionality;
Contribute to architectural decisions (KMP, modularisation, security, API design) and introduce iOS best practices;
Help build reusable components and frameworks (e.g. banking and security platforms) so future projects can launch faster and more securely;
Work on apps where security, privacy and compliance are not afterthoughts, but fundamental requirements (e.g. banking & healthcare apps).
Your qualities and skills as iOS Developer - Native Mobile Platforms (Kotlin Multiplatform)
Why you're the perfect iOS Developer. You have
5+ years of experience as an iOS developer with Swift & SwiftUI;
In-depth knowledge of the iOS ecosystem;
Architecture knowledge such as MVVM, Clean Architecture or equivalent;
Experience in testing (unit/UI tests), debugging and performance analysis;
Experience with CI/CD for mobile (e.g. Azure DevOps, GitHub Actions);
A serious focus on security & privacy: Keychain, secure storage, networking, handling sensitive data;
Experience in enterprise environments: complex backends, APIs, identity (OAuth/OIDC) and associated stakeholders;
Strong communication skills; you can explain your decisions to both developers and non-technical stakeholders;
A proactive, product-oriented mindset: you think in terms of value for the user and the client, not just tickets.
Nice-to-haves
Experience with or a strong interest in Kotlin Multiplatform (KMP) or other shared-code solutions;
Experience of knowledge of The Composable Architecture (TCA);
Experience with Android (Kotlin, Jetpack Compose) or a willingness to understand the KMP side;
Experience with white-label / multi-brand apps (multiple brands from a single codebase);
Knowledge of security frameworks (device binding, RASP) or highly regulated domains (banking, insurance, healthcare);
Experience with automated testing, such as screenshot testing or AI-driven UI tests;
Experience with AI tooling, such as Claude Code, Cursor or GitHub Copilot.
Interested?
Do you see yourself as the iOS developer who wants to combine native quality with modern platform architecture based on Kotlin Multiplatform? Send us your CV (and optionally GitHub/portfolio) and a brief explanation. We would be happy to tell you more about our approach and the projects you can have a direct impact on!
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- #LI-NATALIEWILLEMARS
- #LI-Hybrid
What’s in it for you
25 vacation days
Based on a 40-hour work week.
Travel expenses & holiday pay
Of course, you can count on 8% holiday pay. In addition, we offer various mobility schemes for you to choose from, depending on your role and preference.
Good pension plan
You contribute 4% and iO will supplement the rest up to the full premium.
Hybrid working
A good work-life balance is super important. Together with your team, you’ll decide when and where you work.
Healthy snacks & lunch
At every iO campus, you can grab a healthy snack throughout the day and have a healthy and varied lunch for a small fee.
Personal training budget
Each year, you’ll get a budget of €3,000 to develop yourself, in your profession or as a person, through training, events, or courses.
Celebrating together
If there’s something to celebrate, we know how to party! From time to time, the party team at your campus will organise the best (theme) parties.
Get to know iO
- 2,000+colleagues
- 13campuses
- 5countries
- 26nationalities
- 10+awards in the past year
- ∞growing, learning and challenging yourself
What your colleagues say
Pop talks, pair programming and even UNO? That's how Maaike leads a team at iO.
Maaike Hellemans
Technical Lead JavaFrom SEO expert to content strategist and - today - a copywriter. Experience Pieter's growth story at iO.
Pieter Moons
CopywriterRefreshing perspectives mean Ronald learns something new every day.
Ronald van der Horst
Lead Software DeveloperNakita feels fully supported in her professional development at iO.
Nakita Verbruggen
Teamlead CampaigningFor Lennard, it’s the fact that iO supports open source that’s an extra dimension to his work.
Lennard Swaneveld
Senior Drupal DeveloperMariam on the best parts of her jobs. Personal connections, rewarding work and great collaborations.
Mariam Gooijer - Berrezzouk
Corporate RecruiterFor Marleen, continuous change and evolution are an important part of her iO career.
Marleen van den Brand
DesignerMarcel’s insatiable curiosity for LEGO leads to eye-opening workshops.
Marcel de Jong
Digital StrategistAfter an inspiring meeting with Klaas, Lars takes a surprising step in his iO career.
Lars van Tulden
CRO consultantPatrick and his team set up a team hackathon in search of innovative solutions.
Patrick de Bie
Software Developer
Your application, step by step
Working together, making an impact and growing: it all starts with the right connection. That's why we'd like to get to know you and want you to get to know your future colleagues too.
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Let's get to know each other
We like to act quickly. If we can sense a match, we'll get in touch soon for a virtual introduction. This way, both you and we can see if there's a good fit.
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A quick chat on campus
What makes you happy? During a conversation with two future colleagues on campus, we'd like to get to know you better as a person. What do you find important in an employer and in your work?
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Second round on campus
There are many people here who’d love to meet you! Two other colleagues will join us at the table, and we'll explore how your knowledge, skills, and experience can shine at iO.
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Join the team!
Are we all excited? Congratulations! Go ahead and sign that contract. Together, we'll discuss the practical details and ensure you have everything you need to get started at iO.
FAQ
Apply now
Ready for an exciting career at iO? Apply using this form or through LinkedIn. We’ll contact you soon.