Backend Engineer - Growth Experiments 

We're looking for a Backend Engineer to join our Growth Experiments team in the Consumer Product group. You'll work on the systems that power experiments across Wolt's consumer app, helping millions of users discover the value of Wolt and building the habits that keep them coming back.

This is a team that believes the fastest way to learn is by doing. We prioritize high-velocity experimentation over long development cycles, relying on rigorous A/B testing to validate hypotheses and measure outcomes. Our philosophy is simple: ship small, learn fast, and compound the wins. If you like seeing your work in production quickly, letting data guide decisions, and aren't too precious about code that might get thrown away after an experiment, you'll fit right in. 🚀

What you’ll be doing

You'll join a cross-functional team of Backend, iOS, Android, and Web Engineers, working alongside Designers and Data Analysts, all closely partnered with Product. Beyond the team, you'll collaborate with platform teams and tap into Wolt's engineering community for shared tooling and best practices. 👥

Day-to-day in this role you’ll:

• Design, build, and operate backend services that power growth experiments across the consumer app, primarily in Python, Kotlin, and/or Go.
• Implement A/B tests, feature flags, and experiment infrastructure that let the team validate hypotheses quickly.
• Collaborate closely with Product, Design, iOS, Android, Web, and Data to ship experiments that drive measurable impact on user growth and retention.
• Balance speed with quality: write clean, testable code that's easy to ship and easy to remove when experiments conclude.
• Drive reliability, observability, and efficiency through automated testing, logging, alerting, and incident response.

Our humble expectations* 

Backend development experience in one or more of the following languages: Python, Kotlin (or modern Java), or Go.Experience building and operating production services at scale.Familiarity with databases (PostgreSQL, MongoDB, or similar), RESTful APIs, and CI/CD pipelines.Comfort with experimentation infrastructure: A/B testing, feature flags, or similar.A strong ownership mindset, someone proactive, curious, and eager to ship.A pragmatic approach to quality: you ship fast, encapsulate experimental code properly, and avoid over-engineering.Excellent collaboration and communication skills in English.

Optional, but great to have

Experience in a growth or experimentation-focused team. Familiarity with Kafka, Redis, or event-driven architectures.Experience across multiple backend languages.

What we offer

✨ 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.

Next steps*

This role can be based in Helsinki or Stockholm ONLY. 

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.