Complexio

Senior Platform Security Engineer

Complexio

full-time

Posted on:

Location Type: Hybrid

Location: Warsaw • Poland

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Job Level

Senior

Tech Stack

GoNeo4jPythonReactRust

About the role

  • 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.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
PythonauthenticationauthorizationOAuthJWTpermission modelssecure token handlinggraph databasesNeo4jCI/CD
Soft Skills
reasoning about risktrade-offsreal-world constraintsshipping security improvements