Senior Full-Stack Engineer (Kotlin + React) — NXJ-142
Newxel
Posted: March 31, 2026
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Quick Summary
Design, build, and maintain full-stack applications using Kotlin and React, working in a startup environment with a focus on cybersecurity product development.
Required Skills
Job Description
We are looking for a Senior Full-Stack Engineer (Kotlin + React) to join a team building a cybersecurity product.
In this role, you will take ownership of full-stack development, contribute to architectural decisions, and support the growth of the engineering team. This is a good fit for someone who is comfortable working in a startup environment, takes initiative, and enjoys solving complex technical challenges.
Responsibilities
• Design, build, and maintain full-stack applications using Kotlin (backend) and React (frontend)
• Work with Docker and containerization as part of deployment and DevOps tasks
• Contribute to architectural decisions as the product evolves and scales
• Mentor junior and mid-level engineers and support team growth
• Participate in on-call rotations and handle critical security issues when they arise
Requirements
• 5+ years of professional software development experience
• Strong experience in Kotlin backend development
• Strong experience in React frontend development
• Hands-on experience with Docker and containerized environments
• Agile mindset with the ability to work across both backend and frontend, adapting to changing priorities
• English — Upper-Intermediate (B2) or higher
Will be a plus
• Experience in cybersecurity or a strong interest in the domain
• Experience with WebSockets or real-time systems
• Broader DevOps experience beyond basic Docker usage
• Experience working in small, fast-paced startup teams
What we offer
• Competitive salary and benefits package
• Medical insurance
• Top equipment kit
• Full Remote
• Collaborative and innovative work environment
• Career growth and development opportunities
• A chance to work with a talented and driven team of professional
About the project
You will join an Israel-based cybersecurity product company operating in a startup-style environment, building a platform focused on improving security processes and helping organizations better protect their systems.
The product is already live and used by paying customers. The team is small (under 10 people), with fast decision-making and high ownership.
The company is currently expanding its engineering team to scale the product and deliver new features, including exploration of AI-adjacent directions.