Senior Security Engineer Jobs

Flanks

Location:
Spain, Barcelona

Category:
IT - Software Development

Contract Type:
Employment contract

Salary:

50000.00 - 70000.00 EUR / Year

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Job Description:

We’re looking for a Senior Security Engineer to join the Platform Team at Flanks and take a leading role in strengthening our security foundations. You’ll help us stay secure and resilient across all layers — from code to cloud — working closely with engineers and leadership to make security a core part of how we build. We want someone with a hacker’s mindset, strong technical skills, and a proactive attitude. Someone who doesn’t just find vulnerabilities, but fixes them and improves the system for everyone.

Job Responsibility:

Continuously evolve our tools, practices, and culture of security
Lead security initiatives across our stack (apps, infrastructure, and processes)
Perform pentesting, vulnerability assessments, and incident response
Define and implement security controls derived from business processes
Collaborate with teams to design secure architectures and validate security requirements
Work with auditors and clients to communicate our security posture clearly

Requirements:

Deep experience in ethical hacking, pentesting, and secure software design
Strong knowledge of Python, JavaScript, Kubernetes, and GCP
Ability to understand code, automate security tasks, and design scalable defenses
Hands-on with cloud security, appsec, and infra security
Self-driven, curious, and collaborative — a true security builder
Professional proficiency in both English and Spanish to collaborate effectively in our bilingual environment

Nice to have:

Experience with security automation or detection engineering
Contributions to CTFs, security research, or open-source projects

What we offer:

A cool office between Sants Estació and Plaça Espanya with stunning views of Barcelona
Flexible working hours and hybrid work options
Paid day off on your birthday
Weekly fresh fruit, coffee, and tea on tap
Friday happy hours after our all-hands meetings
Team-building events to bond and have fun
Health insurance and flexible compensation with Alan
A digital canteen, thanks to Nora Real Food, subsidised at 50%
A yearly training budget to keep growing

Additional Information:

Job Posted:
December 08, 2025

Employment Type:

Fulltime

Work Type:

Hybrid work

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Senior Security Engineer