Junior Back-end Developer

Invosy Finland Oy; Helsinki; On-site; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Competitive salary

Excellent employee benefits

Modern office in Kamppi

Growth opportunities

Job summary

Invosy Oy is a growing invoicing service company seeking a skilled Back-End Developer in Helsinki. You will design and implement back-end services and APIs powering both internal systems and client projects.

Join a collaborative development team, write clean code, and contribute to scalable solutions with experience in C#/.NET, SQL, REST APIs, and cloud platforms. Finnish or English fluency is required.

Qualifications

• Back-end development experience of at least 2 years.
• Strong knowledge of C# / .NET and SQL databases.
• Experience designing and building REST APIs.
• Ability to write clean, efficient, maintainable code.
• Experience with Git version control.
• Understanding of application architecture and scalability.
• Teamwork and willingness to learn.
• Fluent in Finnish or English.

Responsibilities

• Design and implement back-end services and APIs powering own systems and client web services.
• Collaborate with front-end developers and designers to deliver seamless experiences.
• Maintain and improve scalable back-end systems.
• Ensure code quality and adherence to best practices.

Skills

C# / .NET

SQL databases

REST APIs

Git

Team collaboration

Tools

Azure

AWS

DevOps

Job description

Who we are

Invosy Oy is a growing invoicing service company that designs and develops its own systems, websites, and digital services for businesses. We operate from a modern office in the heart of Helsinkis Kamppi district, where teamwork and open communication are at the core of everything we do.

We focus on high-quality code, long-term development, and understanding our clients’ businesses. You will have the opportunity to work on meaningful projects that matter to us and our clients.

Your role with us

We are now looking for a Back-End Developer who is passionate about building scalable and efficient back-end systems.

You will work as part of our development team, designing and implementing back-end services and APIs that power both our own systems and custom web services for our clients. In collaboration with front-end developers and designers, you will help build powerful solutions that provide smooth and seamless user experiences.

Technologies we use:

• C# / .NET for back-end development
• SQL working with databases and integrations
• JavaScript basic knowledge for handling API integration and client-side logic
• REST APIs building and maintaining APIs for web services and systems
• Familiarity with cloud platforms (Azure, AWS) and DevOps practices is a plus

What we expect from you:

• Previous experience in back-end development (at least 2 years)
• Strong knowledge of C# / .NET and SQL databases
• Experience with designing and building REST APIs
• Ability to write clean, efficient, and maintainable code
• Experience working with version control (Git)
• Understanding of application architecture and scalability
• Teamwork skills and a willingness to learn
• Fluent in Finnish or English

What we offer you:

• Interesting projects with the opportunity to influence their implementation
• A supportive work environment and colleagues who will help you grow
• A modern workspace in a cozy office in the heart of Kamppi
• A competitive salary and excellent employee benefits

Interested?

We review applications and conduct interviews throughout the application period.

Job details

• Employment relationship: Employment
• Wage: Other According to the contract
• Working time: Weekdays
• Number of positions: 1
• Source: Job Market Finland/Työmarkkinatori
• Osaamisalue: IT & tietoliikenne