{"id":1465297,"url":"https://alion.io/job/capital-com-senior-application-security-engineer","title":"Senior Application Security Engineer","company":{"id":949,"name":"Capital.com","domain":"capital.com","url":"https://alion.io/company/capital","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":86,"open_postings":17,"ghost_share":0,"stale_share":0.353,"repost_share":0,"time_to_fill_p50_days":125,"computed_at":"2026-10-01T05:45:00Z"}},"role":"Security","role_family":"Security","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":63000,"max_usd":110000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":17},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"DefectDojo","optional":false},{"name":"JavaScript","optional":false},{"name":"LLM","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"OWASP","optional":false},{"name":"PoC Library","optional":false},{"name":"Python","optional":false},{"name":"Red Teaming","optional":false},{"name":"Rest API","optional":false},{"name":"STRIDE","optional":false},{"name":"AWS","optional":true},{"name":"IAM","optional":true},{"name":"Kubernetes","optional":true},{"name":"Model Context Protocol","optional":true}],"status":"live","first_seen_at":"2026-09-29T10:26:26Z","employer_posted_date":"2026-09-29","last_verified_at":"2026-10-01T10:04:04Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Capital.com's Product Security team protects our web and mobile applications, infrastructure, and external perimeter in a highly regulated environment. As Senior/Staff Application Security Engineer, you will raise the bar for application security across the organisation. This role is measured by leverage: how well you design, automate, and scale security processes so that many engineering teams can build securely by default.\nYou will lead security architecture reviews and threat modelling, increasingly with the help of AI tooling, and turn one-off security work into repeatable, self-service capabilities. The role combines deep hands-on offensive and defensive security expertise with the engineering mindset needed to automate at scale. You will work closely with development, QA, DevOps, and platform teams.\nResponsibilities:\nSecurity Architecture & Threat Modelling:\nLead security architecture reviews and threat modelling for new and existing systems, using AI tools to make reviews faster, more consistent, and scalable across teams\nAct as a security force multiplier by influencing the standards, patterns, and guardrails that let teams move fast and stay secure\nSecurity Automation & Tooling:\nDesign, build, and automate scalable security processes that engineering teams can self-serve, covering secure design review, threat modelling, testing, and remediation workflows\nIntegrate and automate security checks across the SDLC and CI/CD pipelines (SAST, DAST, SCA, secrets, and IaC scanning), tuned for strong signal and low friction\nOwn and evolve security tooling such as DefectDojo and SAST, DAST, and SCA platforms, maximising automation, coverage, and integration\nApply AI and LLM-based tooling to architecture review, threat modelling, code review, and vulnerability triage, and help define how the team adopts these tools safely\nSecurity Testing & Vulnerability Management:\nConduct and oversee security assessments of web and mobile applications, APIs, and cloud infrastructure, including manual testing and PoC development\nRun vulnerability scans across internal infrastructure and the external perimeter, then analyse findings, define remediation, and track issues to closure\nSupport and triage the Bug Bounty Program and external vulnerability reports, automating triage where possible\nParticipate in and help lead red teaming and offensive security exercises\nEnablement:\nDrive knowledge sharing on secure development, mentor engineers, and deliver training for development and QA teams\nRequirements:\nExperience:\n5+ years in application or product security, or equivalent depth, with a track record of senior or staff-level impact\nDemonstrable experience leading security architecture reviews and threat modelling (e.g. STRIDE, attack trees, data-flow analysis) across multiple teams or products\nProven ability to automate and scale security processes by building tooling, integrations, and self-service workflows that reduce manual effort\nTechnical:\nStrong hands-on security testing skills, including code review and web, mobile, and API application security assessments, as well as the ability to triage and validate external vulnerability reports and bug bounty submissions\nStrong software engineering ability in at least one language (e.g. Python, Go, JavaScript), with the ability to build automation, not just scripts\nDeep understanding of the OWASP Top Ten, secure design, and secure coding best practices\nExperience with SAST, DAST, SCA, and vulnerability management platforms, and integrating them into CI/CD\nStrong understanding of modern application architectures: REST APIs, microservices, cloud-based systems, and containers\nPractical experience applying AI and LLM tooling to security work, or clear enthusiasm and aptitude to do so\nCollaboration:\nExcellent communication and influencing skills: you can explain security concepts to technical and non-technical stakeholders and drive change without direct authority\nA self-starter who enjoys solving complex problems, building leverage through automation, mentoring others, and strengthening security culture\nNice to have:\nExperience securing the AI harness: hardening LLM and agent pipelines, prompts, tool and MCP integrations, and model endpoints against prompt injection, data leakage, and insecure agent actions\nExperience securing Kubernetes, including cluster hardening, RBAC, network policies, admission control, workload isolation, and image and supply-chain security\nExperience securing AWS infrastructure, including IAM, network and account architecture, key and secret management, and CSPM\nExperience building AI-assisted security tooling or internal self-service security platforms\nExperience mentoring or technically leading a security team\nOffensive or advanced security certifications such as OSAI, OSEP, OSCP, or OSWE\nWhat you'll get in return:\nYou will join the company, that cares about work and life balance\nAnnual Bonus based on the performance review cycle\nGenerous Annual Leave Policy\nMedical Insurance and Pension fund, with additional benefit packages based on the location\nHybrid working model (3 days from our modern office and 2 days fully remotely)\nComprehensive Workation Policy with 30 more remote days available.\nPossibility of taking two additional days of paid leave per year to dedicate to volunteering efforts.","description_format":"text","description_chars":5334,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Annual leave","Health insurance","Hybrid work"],"hiring_locations":[{"name":"Bulgaria","iso":"BG","kind":"country"},{"name":"Cyprus","iso":"CY","kind":"country"},{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Application Security","Blockchain & Crypto"],"lifecycle":[{"event":"open","at":"2026-09-29T14:38:29Z"}],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":1,"expected_fill_days":125,"reasons":["conf:6","velocity","win:early"],"computed_at":"2026-10-01T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/capital-com-senior-application-security-engineer","json_url":"https://alion.io/job/capital-com-senior-application-security-engineer.json","meta":{"generated_at":"2026-10-01T18:53:16Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":1114,"day_limit":5000,"remaining_today":3886,"minute_limit":60,"resets_at":"2026-10-02T00:00:00Z"}}}