Senior Backend Engineer / Tech Lead (Node.js, TypeScript)

About the Role

We're looking for a hands-on Senior Backend Engineer / Tech Lead to own core backend development on the Backslash platform. This is a high-ownership role — you'll drive architectural decisions, implement customer-facing features, and keep systems performant and secure at scale. The right person is analytical, self-sufficient, and comfortable working end-to-end with minimal hand-holding.

Key Responsibilities

• Take full ownership of backend development in Node.js and TypeScript
• Lead architectural improvements and simplification of existing systems
• Implement and deliver customer feature requests end-to-end
• Ensure high performance — memory optimization, throughput, and scalability
• Maintain strong application security practices (AppSec) across the codebase
• Participate in an on-call rotation (week-by-week basis)
• Guide technical decisions and mentor team members as a Tech Lead
• Collaborate cross-functionally with product, security research, and customer teams

Requirements

• 6+ years of backend development experience
• Deep expertise in Node.js and TypeScript
• Experience in or readiness to step into a Tech Lead role
• Strong analytical and problem-solving skills — a must
• Solid understanding of application security (AppSec) principles and practices
• Hands-on experience with memory optimization and performance tuning
• Able to work independently, own tasks from spec to production
• English B2+ — clear written and verbal communication

Nice to Have

• Experience in an AppSec-focused product environment — significant advantage
• Familiarity with security packages and vulnerability management tooling (e.g. npm audit, Snyk, OSV, SAST/SCA concepts)
• Background in customer-facing or feature-driven development
• Exposure to code analysis, static analysis, or software supply chain security concepts