Senior Fullstack Engineer

We are growing and looking for talented developers who want to join us on an inspiring journey toward the future. With us, you’ll be part of a community where we value sustainability, growth, and—most importantly—joy at work. Our friendly and inclusive culture, combined with a high level of expertise, creates a unique work environment.

What we offer you:

• 20 + 3 days of vacation
• Additional Health Insurance (Luxury coverage)
• Telephone subsidy and subscription
• Wellness allowance / Multisport

Nion is a newly formed company created by the merger of three leading Nordic consultancies. We are driven by collaboration, innovation, and dedication – building impactful software solutions for companies across Europe.

We are now looking for a Senior Fullstack Engineer to join our international Customer Accounts team and help shape secure, scalable, and user-friendly systems.

About the role

As a Senior Fullstack Engineer, you will:

• Develop fullstack features using React, JavaScript, Java 11+ and Spring Boot
• Define and evolve REST and SOAP APIs (Customer APIs)
• Build GDPR-compliant services with secure authentication and user management (OAuth2, OpenID Connect, SSO)
• Write modular, testable and maintainable code
• Participate in architecture and design decisions
• Mentor junior developers and contribute to technical best practices

Required qualifications:

• Minimum 5 years of professional experience in software development
• Strong experience in Java 11+, Spring Boot, Hibernate
• Solid knowledge of React and modern JavaScript
• Experience building and consuming RESTful APIs
• Good understanding of OAuth2, OpenID Connect, federated authentication
• Experience with cloud technologies (AWS), Docker, and Kubernetes
• Familiarity with Git, GitLab and CI/CD pipelines
• Excellent communication skills and the ability to work in distributed teams

Meriting experience:

• Identity providers such as Cognito, OKTA, or Keycloak
• Background in customer portals, e-commerce, or secure identity systems

Work location: Remote-first from Bulgaria, with hybrid setup later on.

Team: Cross-functional, international teams with colleagues across Europe

We are looking forward to your application!