Kotlin Java Developer

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

Kotlin Java Developer

WE ARE LOOKING FOR Kotlin Java Developer

Unikie is looking for experienced Kotlin Java Full Stack Application Developers to join a long-term customer project. In this role, you will develop and maintain business-critical web applications in a modern cloud-native environment. You will work across the full stack, building Kotlin/Java backend services, developing React frontends, and contributing to cloud infrastructure, CI/CD, and software architecture.

What You'll Do

• 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

Required 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