Senior Security Engineer (Product Security)

Ebury; City Of London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading fintech firm in London is seeking a Senior Security Engineer to embed security throughout the product development lifecycle. The role involves working with engineering teams to mitigate security risks, implementing security practices, and conducting security assessments. Ideal candidates will have over 5 years of application security experience, strong programming skills, and expertise in web and mobile security practices. This position offers a hybrid work model and an opportunity to contribute to innovative financial solutions.

Benefits

Investment in professional development

Career progression opportunities

Modern security tooling

Qualifications

• 5+ years of application security experience required.
• Strong programming skills in multiple languages.
• Deep understanding of security vulnerabilities.

Responsibilities

• Design and implement secure software development practices.
• Conduct automated security testing.
• Lead threat modeling sessions.

Skills

Application security experience

Programming skills in Python, JavaScript/TypeScript, Golang

Understanding of security vulnerabilities

Security testing tools and methodologies

Secure coding practices

Modern development frameworks

Education

5+ years of experience

Tools

GitHub Actions

Aquasec

Trivy

Dependabot

Job description

Overview

Ebury is a global fintech firm dedicated to empowering businesses to expand internationally through tailored and forward-thinking financial solutions. Since our founding in 2009, we've grown to a diverse team of over 1,700 professionals across 40+ offices and 29+ markets worldwide. Joining Ebury means becoming part of a collaborative and innovative environment where your contributions are valued. You will play a key role in shaping the future of cross-border finance while advancing your own career in a dynamic, high-growth industry.

Senior Security Engineer
London Office - Hybrid: 4 days in the office, 1 day working from home

Role Overview

We are seeking a Senior Security Engineer to embed security throughout our product development lifecycle. You will work directly with engineering teams to identify and mitigate security risks through threat modeling, secure code reviews, and integrated security tooling across our web and mobile applications. This role is critical to establishing our secure development practices, implementing industry-standard SSDLC processes, and ensuring our financial products are resilient against evolving threats.

Key Responsibilities

Secure Development Lifecycle (SDLC) Implementation

• Design and implement secure software development practices
• Integrate security gates into CI/CD pipelines following DevSecOps principles
• Establish security quality gates and acceptance criteria
• Develop secure coding standards based on OWASP guidelines
• Create security architecture patterns and reference implementations

Security Code Reviews & Testing

• Conduct in-depth security code reviews for critical features
• Implement automated security testing (SAST, DAST, IAST, SCA)
• Configure and tune security scanning tools (Aquasec, Trivy, Dependabot, etc)
• Review cryptographic implementations against industry standards
• Validate authentication and authorization implementations
• Ensure compliance with OWASP ASVS (Application Security Verification Standard)

Threat Modeling & Risk Assessment

• Lead threat modeling sessions using STRIDE, PASTA, or similar frameworks
• Create threat models for new products and architectural changes
• Identify attack vectors specific to web and mobile platforms
• Develop abuse cases and security test scenarios
• Maintain threat intelligence for fintech-specific risks
• Document security requirements derived from threat models

Platform-Specific Security

• Web Applications: Implement defenses against OWASP Top 10 vulnerabilities
• Mobile Applications: Apply OWASP MASVS and platform-specific guidelines (iOS App Transport Security, Android Network Security Config)
• APIs: Implement API security best practices (rate limiting, authentication, input validation)
• Cross-platform session management and secure data storage

Security Tooling & Automation

• Build and maintain security testing pipelines
• Integrate security tools with GitHub Actions
• Develop custom security linters and pre-commit hooks
• Create automated vulnerability tracking and remediation workflows
• Implement secret scanning and dependency checking
• Build security dashboards and metrics reporting

Developer Enablement & Training

• Create secure coding guidelines for different technology stacks
• Develop a security champions program aligned with OWASP SAMM
• Conduct security training on platform-specific vulnerabilities
• Provide hands-on guidance during security incidents
• Build internal security libraries and frameworks
• Create threat modeling templates and playbooks

Required Qualifications

Technical Expertise

• 5+ years of application security experience
• Strong programming skills in multiple languages (Python, JavaScript/TypeScript, Golang)
• Deep understanding of security vulnerabilities across web and mobile platforms
• Hands-on experience with security testing tools and methodologies
• Expertise in secure coding practices and design patterns
• Experience with modern development frameworks (React, Angular, ReactNative, Flutter)

Security Domain Knowledge

• Expert knowledge of OWASP standards (Top 10, ASVS, SAMM, MASVS)
• Understanding of cryptographic principles and secure implementations
• Experience with threat modeling methodologies
• Knowledge of authentication standards (OAuth2, OIDC, WebAuthn)
• Familiarity with PCI-DSS, PSD2, and Strong Customer Authentication requirements
• Understanding of cloud-native security patterns

Code Review & Analysis Skills

• Ability to identify security vulnerabilities through manual code review
• Experience with static and dynamic analysis tools
• Understanding of common vulnerability patterns across languages
• Knowledge of secure architecture patterns and anti-patterns
• Ability to provide actionable remediation guidance

Professional Requirements

• Experience in financial services or high-security environments
• Strong communication skills to explain security risks to developers
• Ability to balance security requirements with development velocity
• Collaborative approach to working with engineering teams
• Technical writing skills for documentation and guidelines

Preferred Qualifications

• Experience with payment systems and transaction security
• Knowledge of mobile app protection
• Experience building security champions programs
• Background in penetration testing or security research

Key Projects & Initiatives

You'll lead critical security initiatives, including:

• Building threat modeling practice for all products
• Establishing automated security testing in CI/CD pipelines
• Creating platform-specific security standards and libraries
• Developing a security training curriculum for 200+ developers

What We Offer

• Direct impact on the security of products used by thousands of businesses
• Work with cutting-edge fintech products across multiple platforms
• Collaborate with talented engineers across 25+ countries
• Modern security tooling and testing infrastructure
• Investment in professional development and certifications
• Clear progression path to Staff/Principal roles

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About Us

Ebury is a FinTech success story, positioned among the fastest-growing international companies in its sector.

Founded in 2009, we are headquartered in London and have more than 1700 staff with a presence in more than 29 markets worldwide. Cultural diversity is part of what makes Ebury a special place to be. From Sao Paulo to Dubai, Vancouver to Auckland, we enjoy sharing team experiences and celebrating success across our global teams.

Hard work pays off: in 2019, Ebury received a £350 million investment from Banco Santander and has won internationally recognised awards including Financial Times: 1000 Europe\'s Fastest-Growing Companies.

None of this would have been possible without our proudest achievement: our great people. Enthusiastic, innovative and collaborative teams, always ready to disrupt and revolutionise the fast-paced FinTech sector.

At Ebury, we\'re committed to building a workplace where everyone feels valued, supported, and empowered to thrive. We\'re proud to have active employee networks and ESG initiatives that reflect our inclusive culture, including our Women\'s Network, LGBTQIA+ Network, and Veterans Network. These communities provide spaces for connection, mentorship, advocacy, and collaboration across our global teams.

We believe in inclusion. We stand against discrimination in all forms and have no tolerance for the intolerance of differences that makes us a modern and successful organisation. At Ebury, you can be whoever you want to be and still feel a sense of belonging no matter your story because we want you and your uniqueness to help write our future.

Please submit your application on the careers website directly, uploading your CV / resume in English.