Senior Application Security Engineer - Product Security & DevSecOps
Duco
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Job summary
Duco is seeking a Senior Application Security Engineer to own security across the SDLC and CI/CD pipelines. You’ll drive ASPM platform governance, threat modelling, and secure design reviews while partnering with Engineering to embed guardrails and reduce risk.
You will collaborate with our London and Wroclaw teams, influencing DevSecOps practices, securing the software supply chain, and preparing for client assurance reviews and audits.
Qualifications
- Proven experience in an application security, product security or DevSecOps role, ideally within a SaaS environment.
- Hands-on experience integrating security tooling into CI/CD pipelines.
- Track record of turning findings into prioritized remediation actions.
- Strong understanding of OWASP Top 10 and remediation strategies.
- Ability to read/review code in Java, Ruby or Python and explain risks.
- Experience with AWS and infrastructure-as-code, plus security automation.
Responsibilities
- Own security across our SDLC and CI/CD pipelines, embedding secure delivery as the default.
- Build and maintain pipeline security guardrails (SAST, SCA, secrets, IaC, container scanning).
- Strengthen software supply chain security with SBOMs and provenance tracking.
- Define pre-deployment cloud guardrails in policy-as-code with Engineering alignment.
- Lead threat modelling for new features and architecturally significant changes.
- Promote secure coding practices and run security champions network across Engineering.
- Represent platform security in client reviews and audits, reporting risk metrics.
Skills
Tools
Job description
27 Goswell Rd., Barbican, London EC1M 7AN
Duco is on a mission to reduce the time spent on data-related work by 90%. Our enterprise data automation platform empowers teams to work more efficiently and meaningfully by giving them the ability to automate data controls with the latest technology, such as no-code, the cloud, and AI.
We help firms to start trusting their data, by giving them one intuitive platform to automate the front-to-back processing of all kinds of data (from structured Excels and RTFs to unstructured PDFs and emails). This eliminates the boring manual work across the data lifecycle and enables firms to act faster, work smarter, save money, reduce risk and comply with regulatory requirements.
We’re headquartered in London and have offices in New York, Wroclaw, Singapore, and Antwerp. We’re proud to call some of the largest global financial institutions our clients, including over 15 of the world’s largest international banks, as well as brokers, exchanges, asset managers, hedge funds, administrators, service providers and corporates.
We are seeking an experienced Senior Application Security Engineer to take ownership of security across our software development lifecycle (SDLC). In this role, you will establish secure delivery as the default for our engineering teams, from design and code through to the pipelines that release it.
You will own our Application Security Posture Management (ASPM) platform, Ox Security, and ensure its findings translate into effective remediation. This includes reducing noise, prioritising vulnerabilities that are genuinely exploitable and partnering closely with engineering teams to resolve them. You will also define our approach to threat modelling, security testing and the integration of security guardrails into our CI/CD pipelines.
You will join a small, collaborative Information Security team based across London and Wrocław, working alongside our Senior Security Engineer (Cloud & SecOps) and our Governance, Risk and Compliance (GRC) function. You will work closely with our Engineering teams on a day-to-day basis and report to the Head of Information Security.
- Own security across our SDLC and CI/CD pipelines, embedding secure delivery as the default
- Build and maintain pipeline security guardrails, including static application security testing (SAST), software composition analysis (SCA), secrets scanning, and infrastructure-as-code (IaC) and container image scanning, with gating policies agreed with Engineering
- Strengthen software supply chain security, including dependency hygiene, software bills of materials (SBOMs) and build provenance
- Define pre-deployment cloud guardrails through policy-as-code, in partnership with our Senior Security Engineer (Cloud & SecOps)
- Own Ox Security as our ASPM platform, including policy tuning, noise reduction and the prioritisation of findings based on reachability and exploitability
- Drive remediation with engineering teams, agreeing remediation service level agreements (SLAs) with engineering leads and reporting clearly on progress
- Scope and coordinate application penetration testing, tracking findings through to remediation
- Lead threat modelling for new features and significant architectural changes
- Conduct secure design reviews and review high-risk code changes
- Promote secure coding practices through practical guidance, training and a security champions network across Engineering
- Represent our platform security with confidence in client security reviews and due diligence discussions, alongside the Head of Information Security
- Maintain and report application security metrics that inform risk reporting and key risk indicators (KRIs)
- Support audits and client assurance activities with clear evidence of our secure development and release practices
- Monitor emerging application and supply chain threats, including those affecting AI and agentic capabilities
- Proven experience in an application security, product security or DevSecOps role, ideally within a SaaS environment
- Hands-on experience integrating security tooling into CI/CD pipelines
- A track record of converting SAST, SCA, secrets or ASPM findings into prioritised, remediated work rather than raw reporting
- Strong understanding of common vulnerability classes and the OWASP Top 10, with practical knowledge of how to remediate them
- The ability to read and review code in at least one of our core languages: Java, Ruby or Python
- Experience facilitating threat modelling with engineering teams
- Working knowledge of AWS and infrastructure-as-code
- Proficiency in Python or a comparable scripting language for automation
- Credibility with developers, with the ability to influence engineering teams and articulate risk in actionable terms
- Hands-on experience with Ox Security or another ASPM platform
- A background in software engineering prior to moving into security
- Software supply chain security experience, such as Supply-chain Levels for Software Artifacts (SLSA), SBOMs or artefact signing
- Container and Kubernetes security experience, including image scanning and admission controls
- Experience with policy-as-code tooling
- Experience establishing a security champions programme
- Experience securing large language model (LLM) or agentic AI capabilities, such as applying the OWASP Top 10 for LLM Applications
- Familiarity with financial services regulations and standards, such as the Digital Operational Resilience Act (DORA), ISO 27001 and SOC 2
- Relevant professional certifications, such as OSWE, GWAPT, CSSLP or AWS Certified Security – Specialty
- Competitive salary package aligned with your skills and experience. Reviewed annually.
- Annual Performance-based bonus
- Healthcare cashback scheme and private medical insurance
- 4X salary life assurance
- Unlimited annual holiday, because we trust our people to manage their own time off
- Enhanced family leave
- Employee Assistance Programme
- Cycle to Work and Tech Scheme
- 4 Volunteering days off
- Flexible working policy (2 days per week in office)
- Opportunity to work abroad for up to 6 weeks per year
- Personal learning and development opportunities""
- Referral bonus if we hire someone great who you’ve recommended to us
- Spot Rewards
- Employee of the Month and Employee of the Year awards
Head over to our Glassdoor page to learn about our benefits, culture and to find out what our team thinks about life at Duco. You can also find out more about us on LinkedIn
Because we are committed to inclusivity, we strive to provide equitable opportunities for everyone. If you require accommodation during the recruitment process, please let us know at talent@du.co. Include your contact information, the role you're applying for, and how we can accommodate you.
During the interview process and after hire, Duco does not discriminate on the basis of race, colour, gender or gender expression, sexual orientation, marital or pregnancy status, national origin, age, disability, religion or creed, socioeconomic background or status, size, or any other protected characteristic
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