Ref: JJFT02_1636539662

Frontend and Backend Developer


  • 5000 to 5500 EUR
  • Developer Role
  • Skills: TypeScript/JavaScript/React, Ruby, Kotlin, Java,
  • Level: Mid-level

Job description

Frontend and Backend Developer


Front End/Back End Developer (TypeScript, React), €5000/5500 (plus bonus 5% of salary)- Helsinki, Uusimaa, Finland

You will be working with one of the most well-known Consultancies in Finland, working for the frontend code of web applications or the backend consisting of implementing new features. This position can be focused on a wide variety of challenges or involve other kinds of development, depending on your interests.

Backend Responsibilities

* You will be working on parts of their software which is written in Java (v11 currently), Kotlin and JRuby
* You will be implementing new features including calculation algorithms and data structures
* You will be able to profile and optimize these new features to improve them
* This company uses their own in-house-built memory database for data storage, storing tens of billions of rows of data. To achieve high availability and horizontal scalability, this is deployed on a clustered platform. You will be emphasising concurrency and parallelization using functional and immutable paradigms together with efficient memory usage

Backend requirements

* Years of experience in Java (v11 currently), Kotlin and Ruby
* Legitimate interest in implementing complex algorithms in Java
* You can solve nontrivial problems in a performant way
* When it comes to CPU and memory usage, you will know the pros and cons of different data structures are, and how to measure it
* Valuable: previous experience working with large databases and understanding the importance of writing a good covering test and doing thorough code reviews
* Being open-minded and eager to learn new things is a big plus

Frontend Responsibilities

* Writing code and automated tests
* You will be writing documentation, doing code reviews, bug fixes, re-factoring and improving code quality
* You will be involved with planning new features and solutions to identified issues
* You will be collaborating within the team with other internal teams
* Involvement within agile team practices and the development of them


* Years of experience in TypeScript React in the frontend, Ruby in the backend (API layer). The frontend currently interacts with already developed and used JSON API'S, and soon GraphQL
* Several years of experience in software development
* Experience in TypeScript/ JavaScript/ React
* Having appreciation towards clean and maintainable code and reliable software
* Have experience working in an agile software development team
* To have an interest in developing oneself and to share knowledge with others
* Have efficient verbal and written communication skills in English
* Experience with big codebases to debug, maintain and improve


* Experience in d3
* Experience in Cypress
* Experience in GraphQL
* Experience in CI pipelines
* Experience or knowledge of Ruby or Kotlin
* Enthusiasm towards improving frontend code performance

This company is showing continuous improvement of employees, providing paid days off to up-skill employees. There are 8 offices with 600+ people of 42 different nationalities, showing growth and culture within the company.

If this seems like the role for you contact me via email at or call me on +358 75 3263948 for more information.

Jefferson Frank

Jefferson Frank is the Amazon Web Services (AWS) recruiter of choice. We work with organisations worldwide to find and deliver the best permanent and contract AWS DevOps, Big Data, IaaS and PaaS, and AWS Security professionals on the planet. For more information, visit