Senior Security Application Engineer

Pleo

full-time

Posted on: 9/27/2025

Location Type: Hybrid

Location: Copenhagen • 🇩🇰 Denmark

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Senior

JavaKotlinTypeScript

About the role

Partner with engineering teams to design and review secure technical solutions.
Dive deep into authentication, encryption, and partner integration security topics.
Triage and resolve issues identified through the bug bounty program.
Guide developers on secure coding practices and help fix identified vulnerabilities.
Support GRC and DevOps teams with automation and security controls in CI/CD pipelines.
Plan, prioritise, and own the Application Security roadmap.
Drive long-term security initiatives balancing automation, compliance, and access needs.
Report to the Head of Security Engineering and collaborate with Engineering, DevOps, GRC, and Product teams.

Strong communication skills and a pragmatic approach to security.
Experience working closely with developers and product teams.
Proficiency in at least one server-side language (Kotlin or TypeScript preferred).
Expertise in code review and dynamic testing to identify security flaws.
Deep understanding of security libraries, controls, and common vulnerabilities.
Subject matter expertise in at least one technical area of application security.
Passion for learning and solving unfamiliar or complex problems creatively.
Ability to approach problems with honesty, curiosity, and clarity.
(Bonus) Java or Kotlin proficiency, particularly securing JVM-based applications.
(Bonus) Knowledge of PCI DSS, GDPR, or PSD2 and their application to application security.
(Bonus) Experience supporting compliance efforts such as audits, segmentation, or access controls.
Must be eligible to work in the listed locations; employer cannot offer visa sponsorship for this role.

Benefits

Your own Pleo card (no more out-of-pocket spending!)
Lunch is on us for your work days – enjoy catered meals or receive a lunch allowance based on your local office 🍜
Comprehensive private healthcare – depending on your location, coverage options include Vitality, Alan or Médis
We offer 25 days of holiday + your public holidays
For our team, we offer both hybrid and fully remote working options
Option to purchase 5 additional days of holiday through a salary sacrifice
Access to free mental health and well-being support via MyndUp
Paid parental leave

Tip: use these terms in your resume and cover letter to boost ATS matches.

KotlinTypeScriptJavacode reviewdynamic testingsecurity librariessecurity controlsvulnerabilitiesapplication securityCI/CD

communication skillspragmatic approachproblem-solvingcuriosityclarityhonestycollaborationprioritizationguidancepassion for learning