Role: Senior AppSec Engineer
Location: Remote UK
Rate: £750 per day (Outside)
The MRJ team have an urgent contract opportunity available for an experienced Senior Application Security Engineer to help shape and implement a modern Secure SDLC capability across the organisation during a major period of technology transformation.
This is a highly visible role operating across Engineering, Security, and Architecture, focused on embedding security into software delivery without slowing innovation down.
You’ll play a key role in helping the company define what “good” looks like from a modern application security perspective, particularly as the business accelerates delivery across AI, Agentic AI, and a large portfolio of new application projects.
The Role
This is not a traditional operational security role.
We need someone capable of stepping into a complex engineering environment, assessing the current state, and building a pragmatic roadmap toward a scalable, modern Secure SDLC programme.
You’ll work closely with both Security and Engineering leadership, embedding yourself within teams to improve security maturity, influence delivery practices, and help create a more security-aware engineering culture.
The role requires a balance of strategic thinking, stakeholder management, and hands-on technical credibility.
What You’ll Be Doing?
* Assess the current application security and SDLC landscape
* Define and implement a Secure SDLC strategy and roadmap
* Embed security into engineering and development workflows
* Help establish modern AppSec and DevSecOps best practices
* Partner closely with Engineering teams to improve secure development maturity
* Support security considerations across AI and emerging technology initiatives
* Help create scalable, developer-friendly security processes
* Influence stakeholders across Security, Engineering, and Leadership
* Drive security enablement rather than gatekeeping
What experience are we looking For?
* Strong background in Application Security, DevSecOps, or Security Engineering
* Experience building or maturing Secure SDLC programmes
* Strong understanding of modern engineering environments and CI/CD pipelines
* Experience embedding security into Agile / DevOps teams
* Ability to assess current state and define future-state security maturity
* Strong stakeholder management and communication skills
* Pragmatic, collaborative mindset with the ability to influence engineering teams
* Comfortable operating in fast-paced transformation environments
Desirable Experience
* Cloud-native environments (AWS, Azure, or GCP)
* SAST, DAST, SCA, container or IaC security tooling
* AI / GenAI / Agentic AI security considerations
* Experience within high-growth or transformation-led organisations
Next steps
We are shortlisting now with interviews taking place next week. Get in touch by sending over your profile and the team willbe in touch.