Senior Frontend Developer

Ready to revolutionize the energy sector? Join Reactive Technologies and drive safer, smarter, and more sustainable energy solutions.

Reactive Technologies is a leader in accurate grid measurement tools and the company’s mission is to streamline and accelerate the energy sector’s transition to zero-carbon energy.

The company is continuing to expand its services globally across multiple regions, and is therefore looking for an experienced Senior Frontend Developer to strengthen the development team of 10 professionals in Oulu, Finland.

What will you be doing?

As a Senior Frontend Developer, you will play a key part in designing and developing intuitive, scalable and user-friendly cloud-based services that deliver real value to the client professionals operating critical power infrastructure. You will take ownership of the entire UI/UX domain, working closely with stakeholders and designers to create seamless user experiences. The role covers the entire frontend development lifecycle, from architecture and implementation to testing, deployment, and maintenance of production-ready applications. The product’s frontend is built with React and TypeScript, with UI test automation forming part of the development process.Therefore these will be your daily technologies. You will work closely with product management, the Product Owner and the software development team.

What kind of person thrives in this role?

This role is ideal for someone who enjoys taking ownership of the entire UI/UX domain, combining user experience design with hands-on frontend development to create exceptional user experiences. You combine technical expertise with a user-focused mindset and thrive in a collaborative, low-hierarchy environment where people genuinely support each other.

You are a self-driven individual with the ability to work independently and have a mindset for continuous improvement. Most importantly, you are motivated and excited by building products with real-world impact and want to contribute to accelerating the global energy transition with Reactive Technologies.

We hope you have the following:

• Several years of professional experience developing and delivering modern frontend applications in production environments
• Strong experience with React or a comparable modern frontend framework
• Solid experience with TypeScript
• Strong understanding of frontend architecture, design patterns and application lifecycle management
• Experience with UI test automation and quality-focused development practices
• Full professional working proficiency in English

We consider as an asset:

• Experience with CI/CD pipelines and cloud platforms (Azure, AWS or GCP)
• Familiarity with design systems, component libraries, accessibility and frontend performance optimization
• Experience mentoring developers or leading frontend initiatives
• Working proficiency in Finnish

What Reactive Technologies can offer you:

• A role in a growing company using cutting-edge technology to enable the global renewable energy transition
• A role where your skills and insight are truly appreciated
• Opportunities for professional growth and to develop your skills
• A motivated and dynamic work community with a flat and agile structure
• Private healthcare and extensive health insurance coverage
• Lunch, sports and culture benefit plus extra holidays according to your service years
• Competitive salary, bonus scheme, and share option scheme

Practicalities:

This is a full-time and permanent position and you will be employed directly by Reactive Technologies Finland Oy. The preferred start date is in September or October 2026. The company’s office is located in Oulu, and ideally you could work from there (hybrid). Please note that we expect you to already have a valid work permit in Finland.

Ready to join Reactive Technologies’ mission?

Please submit your CV and motivation letter (PDF, in English) by 18.8.2026 at the latest via aTalent’s application system.

Please note that we are actively reviewing applications throughout the application period and processing them in the order they are received. Remember to use the application system, we do not accept applications by email.

We want to ensure that all applicants can participate in the process equally, and we will take individual accessibility needs into account where necessary.

You can familiarize yourself with Reactive Technologies here: and you can read more about the company’s newest funding round (in Finnish) here: GreenTech-yhtiö Reactive Technologies päättää 31,4 miljoonan dollarin rahoituskierroksen.

For more information about the recruitment process contact aTalent’s Recruitment Consultant Veera Kokko (044 783 5666, [email protected]).