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Senior application security engineer

London
Siena Partnership
Security engineer
Posted: 12h ago
Offer description

Job Description

Partnered with a VC backed Fintech organisation I'm looking for a Senior Application Security Engineer to embed application security into there product development lifecycle and CI/CD pipelines. This is an individual contributor role working closely with engineering, SRE and product teams to assess, improve, and scale AppSec across a high‑volume transactional platform.

* Review current application and API landscape, tooling and processes
* Identify gaps and risks, then design pragmatic mitigation plans
* Integrate security into CI/CD, SDLC and change management processes
* Coach and enable software engineers to build secure products by default

Discovery & Assessment

* Conduct a structured review of existing web applications and APIs
* Map current AppSec controls, tooling and processes across the SDLC
* Identify critical vulnerabilities, systemic weaknesses and quick wins
* Triage and prioritise issues based on risk and business impact

Engineering & Implementation

* Embed security controls into CI/CD pipelines (e.g. SAST, DAST, SCA, secrets scanning)
* Partner with SRE and engineering teams on secure architectures and patterns
* Define and implement secure coding standards and best practices
* Drive threat modeling for key products and high‑risk changes
* Support/oversee application pen testing activities as needed

Enablement & Ways of Working

* Work closely with product and engineering leads to “shift left” on security
* Coach and mentor engineers on secure design, coding and review practices
* Create lightweight, usable security guidelines and playbooks for teams
* Influence roadmaps so that security is considered upfront in new product development

Strategy & Roadmap

* Contribute to the AppSec roadmap and longer‑term security strategy
* Recommend and help select security tools and services
* Provide regular visibility on risk, progress and priorities to engineering leadership

Core Experience

* Strong application security background with prior software engineering experience
* Deep understanding of how AppSec fits into modern engineering environments
* CI/CD pipelines, cloud‑native architectures, microservices and APIs
* Secure SDLC and change management practices
* Hands‑on experience with:
* Web application security
* API security
* Threat modeling
* Secure coding and code reviews
* Common AppSec tooling (SAST/DAST/SCA, secrets scanning, etc.)

Please submit your application if your profile matches the criteria.

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