Full Stack Developer

Reaktor Innovations Oy; Tampere; On-site; EUR 52,000 - 75,000; Full time

Job summary

Reaktor Innovations Oy in Tampere is seeking versatile full-stack developers to join our team. You will work across frontend and backend, collaborating with clients to pick technologies and deliver robust software solutions.

We value experience across backend, frontend, ops, and consulting, with fluency in English and awareness of CI/CD, databases (PostgreSQL), and modern stacks like TypeScript/JavaScript React. Finnish language skills are an advantage.

Qualifications

• Experience across backend, frontend, ops, and consulting roles.
• Proficiency in server-side languages and modern frontend frameworks.
• Strong communication and ability to work with clients and stakeholders.

Responsibilities

• Collaborate with client tech and business teams to select the right technologies.
• Implement features across frontend, backend, and databases, including infrastructure.
• Deliver world-class technical expertise to clients and the team.
• Design and debug, contribute to architecture and CI/CD pipelines.

Skills

Full-stack development

Backend development

Frontend development

DevOps practices

CI/CD

TypeScript/JavaScript

React

Node.js

Java/Scala/Kotlin

Python

Database knowledge

English proficiency

Finnish language (advantage)

Tools

PostgreSQL

Job description

Reaktor's award-winning tech community is looking for full-stack developers to join us in Tampere.

Your daily tasks include:

• Working together with the client’s tech and business teams and helping them to pick the right technologies suitable for their needs.
• Implementing new features that require changes to frontend applications, backend servers, and/or databases, even on infrastructure.
• Delivering the client and the team with a world-class technical expertise.
• Other software development-related tasks, such as debugging, designing, and participating in creating the architecture.

You are a curious-minded developer who is comfortable working on both the backend and frontend of an app and understands the role of infrastructure in everyday tasks.

To thrive in this position, you’ll need:

• Experience in a broad range of software development modalities (backend, frontend, ops, and consulting skills).
• We don’t have a hard limit with years of experience, but we’ve noticed that these competencies usually take several years to accumulate.
• Previous experience with at least one common server‑side programming language.
• Currently, many of our projects are built with TypeScript/JavaScript and Node.js. But, Java/Scala/Kotlin, Clojure, and Python are also used.
• Strong knowledge of at least one common client‑side language and framework.
• We often use TypeScript/JavaScript and React on our web app projects and Swift, Java/Scala/Kotlin, or TypeScript/JavaScript React‑native on mobile.
• Relevant skills to create new backend services and build CI/CD pipelines when the project requires.
• Foundational knowledge in DevOps, including Continuous Integration (CI), automated deployment, and test automation.
• Know‑how on databases (e.g., PostgreSQL).
• To be comfortable engaging with the client stakeholders when needed.
• Fluent verbal & written English skills.
• Finnish skills are seen as an advantage.