Senior Application Security Engineer

Senior Application Security Engineer - VC Backed - Series C - Remote (UK or Ireland)

£80,000 – £100,000

Remote first / Equity included / UK & Ireland only

The problem

The last major breach you read about probably didn't start with a hacker breaking through a firewall. It started with something already inside - a compromised dependency, a third party library millions of developers trusted without question. 81% of those codebases contain high or critical vulnerabilities. And now AI is generating dependencies at a scale no human can keep up with.

This is the defining security problem of our generation. And it's getting harder, not easier.

Why this role is different

You'll be embedded directly inside an engineering team, in the sprint, in the design review, in the architecture conversation - before the code is written, not after it ships. And because the product itself is a security platform, the work you do protects not just one company but every developer and organisation depending on software flowing through the platform every day.

What you'll be doing

• Lead threat modelling and secure design reviews across cloud-native, distributed systems
• Security code reviews and coaching engineers to do the same
• Build and operate SAST, DAST, SCA and runtime security tooling
• Harden APIs, containers, IaC and CI/CD pipelines
• Penetration testing and vulnerability assessments across services and infrastructure
• Technical lead during incident response including red/blue exercises
• Write production-quality security automation - not just configure vendor products

What they need

• 3+ years in AppSec with a software engineering background
• Solid AWS security experience
• Hands on experience with security tooling - specific products don't matter
• Able to read production code and hold your own with senior engineers
• Low ego, collaborative, suits a small tight-knit team

The package

• £80,000 - £100,000 depending on experience
• Equity with real upside - founders are engineers who built the structure to reward engineers properly
• 35 days annual leave applied pro rata (inclusive of optional bank holidays) + birthday off
• Flexible working (e.g. flexible hours / remote working)
• Pension (up to 8% matched)
• Paid sick leave (up to 10 days per year)
• Private Medical Insurance & Healthcare Cash Plan (covering Dental and Optical)
• Maternity, Paternity, Adoptive Leave
• Income Protection + Life Insurance
• EV Vehicle Leasing Scheme
• High-performance laptop Setup budget, company swag, access to self-learning platforms, wellbeing support & free conference days.

Interested?

Drop me a message and I'll share more details confidentially. This isn't being advertised widely - if the problem resonates, it's worth a conversation