Kotlin Backend Engineer: Scale Production Microservices

Wolt Oy; Helsinki; On-site; EUR 70,000 - 110,000; Full time

Job summary

Wolt Oy is seeking experienced Software Engineers to join the Merchant Group in Helsinki or Stockholm. You will work on production-grade microservices in Kotlin and Go, building scalable systems that power merchants' experiences and growth.

You will collaborate across the full development lifecycle, shape architecture, and learn from seasoned teammates in an environment that values ownership, experimentation, and impact.

Qualifications

• Experienced Software Engineer with a strong backend background.
• Proficient in Kotlin and Go; JVM languages like Java/Scala are a plus.
• Willingness to learn Go and work in a fast-paced, scalable environment.

Responsibilities

• Design, build, and scale reliable systems that power merchant experiences.
• Work across the full development lifecycle - from business logic and testing to cloud infrastructure and data streaming.
• Collaborate on architecture and technology choices that keep our systems simple, scalable, and efficient.
• Grow your skills and knowledge by working alongside experienced teammates in an environment that values learning and experimentation.

Skills

Kotlin

Go

Java

Scala

Tools

PostgreSQL

MongoDB

Kafka

Redis

GitHub Actions

AWS

Docker

Kubernetes

Job description

Wolt Oy is seeking experienced Software Engineers to join the Merchant Group in Helsinki or Stockholm. You will work on production-grade microservices in Kotlin and Go, building scalable systems that power merchants' experiences and growth.

You will collaborate across the full development lifecycle, shape architecture, and learn from seasoned teammates in an environment that values ownership, experimentation, and impact.