Full Stack Developer

Reaktor Innovations Oy; Helsinki; On-site; EUR 60,000 - 90,000; Full time

Job summary

Reaktor Helsinki is seeking a Full Stack Developer to collaborate with client teams and implement features across frontend, backend and databases. The role involves contributing to architecture and delivery across the stack.

Applicants should have broad software development experience, proficiency in TypeScript/JavaScript and Node.js, React, and knowledge of CI/CD, DevOps basics, PostgreSQL, and fluent English. Finnish language skills are an advantage.

Qualifications

• Broad software development experience.
• Proficiency in TypeScript/JavaScript and Node.js.
• Experience with React and PostgreSQL.
• Knowledge of CI/CD and DevOps basics.
• Fluent English; Finnish skills are an advantage.

Responsibilities

• Collaborate with client teams to understand requirements.
• Implement features across frontend, backend, and databases.
• Contribute to system architecture and design.

Skills

Software development

TypeScript/JavaScript

Node.js

React

CI/CD pipelines

DevOps basics

PostgreSQL

Fluent English

Client stakeholder engagement

Finnish (advantage)

Job description

Full Stack Developer at Reaktor Helsinki

Responsibilities include collaborating with client teams, implementing features across frontend, backend, and databases, and contributing to architecture.

Requirements

Requirements include broad software development experience, proficiency in TypeScript/JavaScript and Node.js, React, knowledge of CI/CD, DevOps basics, PostgreSQL, and fluent English.

• Experience in a broad range of software development modalities (backend, frontend, ops, and consulting skills)
• Proficiency with at least one server-side language (TypeScript/JavaScript and Node.js common; Java/Scala/Kotlin, Clojure, and Python also used)
• Strong knowledge of at least one client-side language and framework (TypeScript/JavaScript and React; mobile stacks like Swift, Java/Scala/Kotlin, or TypeScript/JavaScript React-native)
• Experience building backend services and CI/CD pipelines
• Foundational knowledge in DevOps (CI, automated deployment, test automation)
• Know-how on databases (PostgreSQL)
• Comfort engaging with client stakeholders
• Fluent English; Finnish skills are an advantage

The role offers growth opportunities, internal training, and a supportive, low-hierarchy environment.