Senior Kotlin/Java Full-Stack Engineer | Cloud-Native Apps

Unikie; Helsinki; On-site; EUR 70,000 - 100,000; Full time

Job summary

Unikie is seeking an experienced Kotlin Java Full Stack Developer to join a long-term customer project in Helsinki. You will build Kotlin/Java backend services, React frontends, and contribute to cloud infrastructure, CI/CD, and software architecture.

You will work across the full stack, collaborating with stakeholders in a multi-vendor environment while ensuring secure, scalable solutions and modern cloud-native practices.

Qualifications

• 5+ years of experience in Full Stack or Backend development.
• Strong hands-on experience with Kotlin, Java, and Spring Boot.
• Experience with React and TypeScript/JavaScript.
• Solid understanding of microservices and API integrations.
• Experience with Kubernetes, cloud platforms (AWS), and CI/CD tools.
• Familiarity with Infrastructure as Code tools such as Terraform, CloudFormation, or Ansible.
• Good knowledge of SQL databases and Redis.
• Experience with secure development practices and testing.
• Experience working in multi-vendor environments.
• Fluent Finnish and English.

Responsibilities

• Develop backend services using Kotlin, Java, and Spring Boot
• Build and maintain React applications with TypeScript/JavaScript
• Design and integrate REST and SOAP APIs
• Develop scalable microservices running on Kubernetes and cloud platforms such as AWS
• Contribute to CI/CD pipelines, DevOps practices, and infrastructure automation
• Work with SQL databases, Redis, Linux environments, and secure authentication solutions
• Collaborate with stakeholders and development teams in a multi-vendor environment

Skills

Kotlin

Java

Spring Boot

React

TypeScript/JavaScript

Microservices

Kubernetes

AWS

CI/CD

Terraform

Tools

Jenkins

GitLab CI

Docker

Job description

Unikie is seeking an experienced Kotlin Java Full Stack Developer to join a long-term customer project in Helsinki. You will build Kotlin/Java backend services, React frontends, and contribute to cloud infrastructure, CI/CD, and software architecture.

You will work across the full stack, collaborating with stakeholders in a multi-vendor environment while ensuring secure, scalable solutions and modern cloud-native practices.