Lead Backend Engineer - AI-Driven Cloud-Native Systems

OX Security; Warszawa; On-site; PLN 300,000 - 420,000; Full time

Job summary

Ox Security in Warsaw, Poland, is seeking a Backend Team Lead to guide engineering execution, shape architecture, and deliver scalable, high‑quality software.

This hands‑on leadership role partners with Engineering, Product, Customer Success and customers, owning execution across multiple workstreams and steering technical decisions.

You’ll drive AI‑first initiatives, mentor teammates, and contribute to AWS/MongoDB cloud development while maintaining quality.

Qualifications

• 6+ years of hands-on development experience with leadership exposure.
• Node.js is a must-have; React is preferred; AWS experience is must-have.
• Python is a plus and AI-first mindset is valued.
• Proven track record delivering end-to-end features in a fast-paced environment.
• Strong communication to lead a global team and convey technical decisions.

Responsibilities

• Ownership: Lead the team’s execution across several workstreams, ensuring high-quality delivery within every sprint.
• Strategic Planning: Own the Sprint Planning process
• Coordination: Act as the primary bridge between your team and other departments to remove blockers and support cross-team dependencies.
• Growth & Velocity: Continuously improve team velocity and individual capabilities through coaching, mentoring, and identifying skill gaps.
• Robust Architecture: Own the technical design of team features, ensuring they are scalable, reliable, and 'clean.'
• Hands-on Contribution: Lead by example in high-scale, cloud-based development (AWS, MongoDB) and conduct rigorous code reviews.
• Product Collaboration: Work closely with Product Managers to shape features from initial concept through to production.
• AI-First & Performance Mentality: Integrate AI tools and workflows into daily development and drive a Get Things Done culture.

Skills

Node.js

React

AWS

Python

Leadership

Team management

Tools

MongoDB

Job description

Ox Security in Warsaw, Poland, is seeking a Backend Team Lead to guide engineering execution, shape architecture, and deliver scalable, high‑quality software.

This hands‑on leadership role partners with Engineering, Product, Customer Success and customers, owning execution across multiple workstreams and steering technical decisions.

You’ll drive AI‑first initiatives, mentor teammates, and contribute to AWS/MongoDB cloud development while maintaining quality.