Mobile Senior iOS Engineer - Experiments Team

About Wolt

At Wolt, we create technology that brings joy, simplicity and earnings to the neighborhoods of the world. In 2014 we started with delivery of restaurant food. Now we’re building the delivery of (almost) everything and you’ll find us in over 500 cities in 30 countries around the world. In 2022 we joined forces with Door Dash and together we keep on dreaming big and expanding across the globe.
Working at Wolt isn’t always easy, but it’s definitely exciting. Here you’ll learn more, build more, and ship more than in most other companies. You’ll be challenged a lot, but also have a lot of fun on the way. So, if you’re a self-starter with drive and entrepreneurial spirit, this could be the ride of your life.

Wolt is looking for a Senior iOS Engineer to join our Growth Experiments team in the Consumer Product group. Our mission is to help users effortlessly discover the value of Wolt, creating delight and building lasting habits.

We believe the fastest way to learn is by doing. We prioritize high-velocity experimentation over long development cycles. Working in a tight loop with Designers, Engineers, and Data Scientists, we rely on rigorous A/B testing to validate hypotheses and measure experiment outcomes. Our philosophy: ship small, learn fast, compound the wins. This role is for those who want to move quickly, ship often, and let the data speak.

You’ll be part of a cross-functional crew:
Product Managers, Backend, Android, and Web Engineers, plus Data Analysts who help us make sense of it all. Beyond the team, you’ll collaborate with our Platform team and tap into Wolt's wider iOS community for best practices and knowledge sharing.

This is a hands-on technical role focused on building and iterating on user-facing experiments across the Wolt iOS app. You'll work closely with product and data to ship things that make a real, measurable difference.

• Build, test, and ship experiments across the iOS consumer app
• Collaborate with Product, Design, and Data to define hypotheses and measure outcomes
• Implement A/B tests and feature flags to validate ideas quickly
• Write clean, testable code that's easy to ship, and easy to remove when an experiment wraps up
• Mentor engineers and contribute to technical direction through code reviews and design discussions
• Partner with the Platform team and iOS community on shared tooling and best practices

• At least 5 years of commercial experience with iOS development
• Proficiency in Swift, UIKit, Swift
  
  UI, Reactive Programming, Swift Package Manager, and familiarity with iOS architecture patterns and modularization
• Experience with RESTful APIs, CI/CD pipelines, Git workflows, and writing testable code
• Familiarity with A/B testing frameworks and feature flagging on mobile
• Experience working in large teams, cross-team initiatives, and mentoring engineers
• Strong collaboration and communication skills with a quality-first mindset
• Strong sense of ownership: ships quickly, encapsulates experimental code properly, avoids over-engineering
• Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience

• Experience working in a growth or experimentation-focused team
• Backend development exposure (Python, Kotlin, or Go)
• Experience across both iOS and Android platforms

• ✨ Ship and learn fast:
  See your work in production quickly and let data guide what's next.
• 🤝 Collaborate across disciplines:
  Work shoulder-to-shoulder with Product, Design, Data, and mobile engineers.
• 📈 Drive real impact:
  Your work directly influences user growth and retention metrics.

This role can be based in Helsinki or Berlin.
We're reviewing applications as they come in, so if this sounds like your kind of challenge, don't wait too long. We'd love to hear from you.

The hiring process typically includes an initial chat with our Talent Acquisition Partner, followed by technical interviews, a team conversation, and final alignment.

Feel free to check the Wolt Tech Blog for more about our culture & technology.

We’re committed to growing and empowering a more inclusive community within our company, industry, and cities. That’s why we hire and cultivate diverse teams of people from all backgrounds, experiences, and perspectives. We believe that true innovation happens when everyone has room at the table and the tools, resources, and opportunity to excel.