Senior Application Security Engineer

Job description

Senior Security Engineer – Mobile & Application Security

We are looking to hire two Senior Security Engineers with a strong focus on mobile application security to help raise the security bar across our mobile and backend platforms. This is a hands-on role, working closely with engineering and product teams to identify, design, and implement effective security controls throughout the development lifecycle.

Key Focus Areas

Mobile App Security (iOS & Android)

• Authentication and authorization mechanisms
• Secure data storage
• Runtime protections and hardening techniques

API Security

• OAuth and token-based authentication
• Abuse prevention and rate limiting
• Identification and mitigation of business logic vulnerabilities

Secure SDLC

• Threat modeling and design reviews
• Hands-on security reviews of mobile and backend systems

Cross-functional Collaboration

• Partnering closely with product managers and mobile/backend engineers to embed security into day-to-day development

Ideal Background

• Proven experience as an Application Security Engineer, Product Security Engineer, or Mobile Engineer with a strong focus on application security
• Strong understanding of mobile-to-API interaction patterns and common attack vectors in modern mobile applications
• Ability to work hands-on and pragmatically with engineering teams

Nice to Have

• Experience with React Native internals

Extra information

Status

Open

Education Level

Secondary School

Location

Greater London

Type of Contract

Full-time jobs

Published at

23-04-2026

Profession type

Accountancy

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English