Hybrid Senior Platform Security Engineer

at Complexio

• Job title: Senior Platform Security Engineer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Neo4j, Python, React, Rust, Go
• Location requirements: Hybrid, Warsaw, Poland

About the role

• Platform Security Engineer (Senior+) designing and building security controls handling sensitive data for product applications. Working hands-on to improve security practices and risk management.

Responsibilities

• We are looking for two Platform Security Engineers (Senior+) to join our Product Security domain.
• This role exists because the scope and importance of our work has outgrown the capacity of a single person.
• Our platform underpins multiple products and handles sensitive, high-value data.
• At its core sits a large, graph-based data store that powers downstream systems.
• Building and securing access to that data, correctly and pragmatically, is critical to the company.
• This is a hands-on engineering role.
• You will design, build, and ship production-grade security and privacy controls, not just define policies or review designs from the sidelines.
• Improving and maintaining supply-chain security, including SAST, SCA, container scanning, and CI/CD hardening.
• This role is intentionally broad. You will not be a single-domain specialist, and you will not be shielded from complexity.

Requirements

• Strong proficiency in Python (our primary language)
• Deep understanding of authentication and authorization concepts, including OAuth, JWTs, permission models, and secure token handling
• Experience designing and securing non-trivial data systems
• Ability to reason about risk, trade-offs, and real-world constraints
• A track record of shipping real security improvements, not just writing policy
• Strongly preferred
• Experience with graph databases, ideally Neo4j or similar
• Experience with CI/CD and supply-chain security (SAST, SCA, container scanning, pipeline hardening)
• Experience with Go or Rust
• Some familiarity with frontend or React (not required, but useful for end-to-end thinking)

Benefits

• Join a pioneering joint venture at the intersection of AI and industry transformation.
• Work with a diverse and collaborative team of experts from various disciplines.
• Opportunity for professional growth and continuous learning in a dynamic field.