Senior Software Engineer - Backend Node.js

Headquartered in Berlin, we’re a fast-growing B2B security SaaS platform making identity security smarter and simpler for enterprises worldwide. You’ll be part of a diverse team that thrives on creativity, collaboration, and cross-border problem-solving. With cybersecurity now mission-critical, you’ll be building not just a career, but a future in one of tech’s most dynamic and resilient sectors. Joining Unosecur means stepping onto a global stage.

We are looking for an experienced SDE-3 Backend Engineer to lead the design and development of scalable, secure backend systems powering our cloud-native cybersecurity platform. This is a high-impact role for someone who thrives in fast-paced product environments, enjoys solving deep technical challenges, and is excited about shaping secure systems in the modern cloud.

WHY JOIN US

At Unosecur, you’ll join a fast-growing identity security startup based in Berlin, Europe’s innovation capital, while working in a diverse, multinational environment. Continuous excellence in this role offers a chance to build a global career, gain exposure to European work culture, and collaborate with forward-thinking minds across borders. With cybersecurity and identity protection becoming mission-critical across industries, you’ll be entering one of tech’s most dynamic and future-proof sectors.

THE IDEAL MINDSET

To thrive here, you’ll need an entrepreneurial spirit and a strong sense of ownership. We value self-starters who embrace ambiguity, learn fast, and stay curious about emerging technologies. The ideal candidate is adaptable, proactive, and collaborative, with the resilience to handle challenges and the optimism to turn them into opportunities. If you’re ready to help shape the future of identity security, we want to hear from you.

KEY RESPONSIBILITIES

Backend system architecture : Lead the design, development, and optimization of scalable backend services using Node.js, MongoDB, Redis, and NoSQL systems.

End-to-end delivery : Own and deliver complex backend modules, ensuring high availability, fault tolerance, and cost efficiency.

Cloud integration : Deploy and manage infrastructure across AWS, Azure, or GCP, following security and performance best practices.

Security by design : Implement cybersecurity best practices, including secure API handling, encryption, and threat mitigation.

Cross-functional collaboration : Partner with DevSecOps, frontend engineers, and product managers to deliver robust and secure features.

Mentorship and code quality : Conduct code reviews, guide junior developers, and uphold high engineering standards.

Security advocacy : Participate in secure code reviews, threat modeling, and contribute to the overall security posture of the product.

REQUIREMENTS

Experience : 8–12 years of strong backend development experience in product-based, fast-paced environments.

Technical skills : Proficient in Node.js, MongoDB, Redis, and asynchronous programming models.

Cloud expertise : Hands-on experience with AWS, Azure, or GCP and infrastructure best practices.

Cybersecurity knowledge : Deep understanding of authentication / authorization flows, OWASP top 10, secure coding, and data privacy.

Startup agility : Prior experience in early or growth-stage startups with a bias toward rapid development and problem-solving.

Tooling : Familiarity with CI / CD, microservices architecture, Docker / Kubernetes is a big plus.

Soft skills : Strong ownership mindset, effective communication, and team leadership.

NICE TO HAVE

Security engineering : Experience participating in security reviews and building systems with compliance in mind.

Observability and performance : Familiarity with performance monitoring tools and optimization strategies.

DevSecOps mindset : Understanding of how engineering decisions impact the product’s threat surface and operational risk.

If you’re excited about building resilient, secure systems in a product-driven cybersecurity startup, we’d love to hear from you.