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Senior Security Engineer (AppSec)

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Onsite

Senior Security Engineer (AppSec)

Lawrence Harvey

Senior Security Engineer (AppSec)

Skills

Git

18 days ago

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Important information


Contract type:

Permanent

Salary:

£120,000 – £150,000 / year

Location:

London, UK

Work mode:

Onsite

Published on:

7 October 2026

What they need


Role : Senior Security Engineer (AppSec)

Location : London 1-2 days per week

Salary : up to £150,000 fixed + bonus + benefits + LTI's and share options

Are you looking to join a fast-growing firm that is currently undergoing a major rebuild of its Security Engineering function?

You won't be inheriting an existing, mature security programme here and maintaining it. You'll be joining at a point where there's a genuine opportunity to challenge what already exists, rip out what doesn't work and rebuild Security Engineering properly, all across a complex cloud-native, platform and application environment.

What you'll be doing:

  • Building, deploying and owning security tooling and controls in production
  • Improving security across the full SDLC
  • Embedding threat modelling, requirements and automated controls into delivery.
  • Owning and optimising SAST, DAST and SCA across CI/CD
  • Working closely with Platform and Software Engineering teams to prioritise and remediate vulnerabilities based on risk

Some of what you'll bring:

  • Strong experience building and shipping security platforms and tooling. Ideally within Application Security
  • Strong production coding experience and solid CI/CD, testing, version control and observability
  • Hands-on experience designing security controls across complex cloud environments.
  • SAST, DAST, SCA, threat modelling and integrating security into the SDLC.
  • Experience working with PCI-DSS, DORA, GDPR or similar requirements.

Bonus points:

  • Offensive Security, Red Teaming, Penetration Testing background. An defensive security specialist with an attacker mindset
  • You've got a comprehensive understanding of (or experience within) the Cryptocurrency space

This is a genuinely exciting chance to join at an inflection point for Security Engineering; you'll have the autonomy, technical scope and backing to build things properly . If you're looking to shape architecture, write code, solve hard problems and see your work deployed at scale.

** This is a hands-on engineering role; it's imperative that you're building and deploying security tooling at scale in your current or previous role

** Top end of salary banding indicates that you have all of the above requirements in depth, with the 'bonus points'

Apply using the link or send an updated resume to [email protected]

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