Hybrid Senior Frontend Developer

at Reaktor

• Job title: Senior Frontend Developer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: JavaScript, React, TypeScript
• Location requirements: Hybrid, Helsinki, Finland

About the role

• Senior Frontend Developer at Reaktor in Helsinki. Collaborate with clients to build high-traffic consumer-facing web applications using React and TypeScript.

Responsibilities

• Collaborating with the client’s tech and business teams to identify and implement the most effective technologies for their specific goals.
• Building and evolving high-traffic web front-ends where performance, reliability, and scale are essential.
• Writing clean, maintainable code in daily partnership with designers and backend developers to ensure a cohesive product.
• Providing the client and the team with high-level technical expertise and acting as a trusted advisor for front-end architecture.
• Driving long-term codebase health by proactively improving performance, accessibility, and overall quality.

Requirements

• Senior level competency: We don’t have a hard limit with years of experience, but we’ve noticed that in this kind of Senior role, competencies we are looking for usually take several years to accumulate (e.g. 8+ years of hands-on experience).
• Previous experience working on large, consumer-facing web products to ensure a deep understanding of scale and complexity.
• Strong hands-on expertise in React, TypeScript, and JavaScript, with the ability to take full ownership of front-end work from implementation all the way to production.
• A good sense of design and a clear understanding of how front-end decisions directly affect usability and the user experience.
• Familiarity with web accessibility considerations and how they influence front-end logic and component design.
• Consultative mindset and comfort working in close collaboration with clients and non-technical stakeholders to bridge technical execution with business goals.
• Fluency in Finnish and English, both verbal and written.
• Readiness to work in a hybrid-model, min. 2-3 days/week at our or client’s Helsinki office.

Benefits

• To be able to impact how you work. Together with the client, your team chooses the approach, technologies, and methodologies you think will work best in any given situation.
• A community with as much support as your heart desires.
• A team that’s not only experienced but considerate as well – they all want you to succeed.
• A sustainable work-life balance and support for your daily life outside of work. (e.g., free moving day, Reaktor car share, sick child care services, office space to use for your private events, etc.).
• An opportunity to grow as a professional. In addition to the day-to-day work, we offer internal training courses, community events, and 15-minute coffee breaks to discuss hot topics in tech and design.
• A possibility to take part in more extended academy-like studies like Cloud Academy.
• 300+ hobby clubs, from winter swimming and running to knitting and archery, that bring people together outside of (and sometimes inside) office hours. Many of these are supported by Reaktor.