Security Engineer

Security Operations (SecOps) (7.0 yr.)
$50/hr
englishEnglish C1
senioritySenior

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Summary

Senior Security Engineer - penetration testing, threat modelling, Python. Hands-on offensive and defensive security for web applications. 7+ years. Remote/Hybrid, UK, Chechia, Spain - employment contract, Poland, Romania, Slovakia, Bulgaria, Ukraine - B2B contract.

Are you a talented developer looking for a remote job that lets you show your skills and get decent compensation? Join Upstaff.com, a platform that connects you with hand-picked startups and scale-ups in the US and Europe.

Required Skills

Penetration testing, Security Engineer

Penetration testing

SecOps, Security Engineer

SecOps

Nice to Have

ID: 300-144-038
Last Updated: 2025-12-16

The role

This is a senior security engineering position with a strong emphasis on penetration testing and threat modeling. You'll work across the full security lifecycle: designing secure architectures, modeling threats, researching emerging attack vectors, and validating defenses through hands-on testing.

The focus is on long-term security improvements — identifying and addressing risks before they become incidents. You'll need both the attacker's mindset to find vulnerabilities and the engineering skills to help fix them properly.

What you'll work on

  • Penetration testing and security assessments against web applications and internal systems
  • Leading security design reviews and threat modeling for new products and infrastructure changes
  • Researching emerging threats and attack techniques, then translating findings into practical defense strategies
  • Building security automations and tools, and prototypes to support testing and detection
  • Collaborating with engineering teams to remediate vulnerabilities and improve secure development practices
  • Contributing to security architecture decisions and standards

What we're looking for

  • 7+ years in security engineering with substantial experience in both offensive and defensive work
  • Proven, hands-on web applications penetration testing experience
  • Strong programming skills, preferably Python, with experience building security tools or automation
  • Deep expertise in at least one core security domain: cryptography, authentication/authorisation, secure architecture, or network security
  • Clear understanding of attack vectors and methods and how to anticipate them
  • Good communication skills in English

Useful additions

  • Experience securing serverless architectures or AI/ML platforms
  • Background in cloud-native security (AWS, GCP, Kubernetes)
  • DevSecOps experience- integrating security into CI/CD pipelines
  • Relevant certifications (OSCP, OSCE, CISSP, or similar)

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