Senior Fullstack Engineer (Java/Kotlin, React)

TL;DR

Senior Fullstack Engineer (Identity Access Management): Designing, developing, and deploying secure, user-focused IAM solutions for the hirify.global digital real estate ecosystem with an accent on Single Sign-On, Identity Federation, and Multi-Factor Authentication. Focus on integrating Okta, managing API security, and promoting engineering excellence for scalable and performant applications.

Location: Hybrid work model with three days of on-site work per week in **Berlin, Germany**. **Relocation support** is provided for visa processes and packages.

Company

hirify.global is the home of Immohirify.global, Germany’s #1 platform for real estate, revolutionizing the market for over 25 years.

What you will do

• Design and implement authentication and authorization systems aligning with business goals and compliance.
• Develop secure backend logic using Java or Kotlin with Spring and serverless TypeScript, and user-friendly interfaces in React.
• Integrate and administer Okta, implementing OAuth 2.0, OpenID Connect (OIDC), and custom sign-on policies.
• Develop and automate identity workflows using Okta Workflows, and monitor and troubleshoot SSO systems.
• Manage API security & token management, safeguarding communication between distributed services.
• Own the full development lifecycle following the “You build it you run it” principle and mentor engineers.

Requirements

• Bachelor’s degree in computer science or a related field.
• Significant professional experience as a **Senior Fullstack Engineer** working on secure, distributed, cloud-based systems.
• Expertise in both backend (Java/Kotlin, Spring) and frontend (React, TypeScript) development.
• Strong hands-on experience with **Okta administration and integration**, including automation and custom policies.
• In-depth knowledge of **OAuth 2.0, OpenID Connect (OIDC), SSO, MFA, Identity Federation**, and **API security/token management**.
• Familiarity with **AWS services** and Infrastructure as Code (IaC) principles.
• Excellent communication and leadership skills, with experience mentoring engineers.
• **English B2+ required** as the job posting is in English.

Nice to have

• Experience leveraging AI tools to drive problem-solving and productivity.

Culture & Benefits

• Hybrid work model with three days on-site per week in the Berlin office.
• 30 days of vacation per year.
• Possibility to work from abroad for 10 days per year.
• Relocation agency support with visa process and an attractive relocation package.
• Dedicated learning time, online courses, structured feedback, and individual career paths.
• Company pension scheme with attractive subsidy.
• Barrier-free office in the heart of Berlin with a gym, napping room, rooftop terrace, and organic coffee.