Senior Security Engineer

Lime is the largest global shared micromobility business, on a mission to build a future where transportation is shared, affordable, and carbon-free. They are seeking an experienced Senior Security Engineer to join their Product Security team, contributing to the security of Lime's software, APIs, mobile applications, and connected vehicle platforms across the full product lifecycle.

Responsibilities:

• Partner with engineering teams to perform security reviews, threat modeling, and risk assessments for product features, APIs, mobile applications, and backend services. Provide actionable and risk-calibrated guidance that helps Lime ship securely without slowing down
• Develop and maintain scalable security tools and pipelines to automate vulnerability detection, dependency scanning, and security testing across the software development lifecycle. Contribute to and extend our security pipeline and CI/CD security gates (SAST, DAST, SCA, secrets management)
• Contribute to security architecture reviews for new product platforms and features. Evaluate authentication and authorization designs, API security posture, and data handling practices to ensure risks are identified and addressed early
• Support the operations of our BugCrowd bug bounty program, including triage, researcher communication, remediation coordination, and internal validation of reported findings
• Serve as a product security point of contact for security incidents affecting Lime's applications and services. Contribute to investigation, root-cause analysis, corrective action, and post-incident improvement
• Work closely with Software, Platform, Mobile, and Infrastructure engineering teams to embed security into development workflows. Share knowledge, drive security-by-default practices, and mentor engineers and peers on product security fundamentals
• Continuously evaluate emerging threats, vulnerabilities, and regulatory requirements (including EU CRA) relevant to Lime's product and infrastructure stack. Bring proactive recommendations to the team
• Participate in the team's on-call rotation, responding to incidents, troubleshooting issues, and contributing to root cause analysis and service reliability improvements
• Respond to and troubleshoot production issues, outages, and critical alerts during assigned on-call shifts
• Escalate incidents as needed and collaborate with team members to restore service
• Document issues and contribute to improvements that reduce recurring incidents
• Be available to provide occasional after-hours, weekend, and holiday support while on call

Requirements:

• 5+ years of experience in a dedicated product security, application security, or security engineering role, with a strong track record of hands-on technical contribution across the software development lifecycle
• Demonstrated expertise across core product and application security domains
• Experience with detection engineering, security monitoring, or building detection-as-code (DaC) pipelines for product or application security threats (SIEM, log analysis, alert tuning)
• Familiarity with IoT, connected hardware, or vehicle/firmware security in a product security context
• Experience operating or contributing to a vulnerability disclosure or bug bounty program
• Exposure to regulatory frameworks relevant to connected products, such as EU CRA, UNECE WP.29, or OWASP MASVS
• Mobile security (iOS, Android) and API security
• Secure development practices and SDLC security integration (SAST, DAST, SCA, secrets management)
• Vulnerability management tooling and processes
• Cloud security fundamentals (AWS, GCP) and container/infrastructure security
• Authentication and authorization patterns (OAuth, OIDC, RBAC)
• Strong analytical skills with the ability to triage ambiguous security signals, identify meaningful risk, and propose pragmatic mitigations that teams can act on
• Clear written and verbal communicator who can translate complex technical security risks into actionable guidance for both engineering peers and non-technical stakeholders
• Comfortable operating in a lean, remote-first, high-trust environment
• Ability to participate in a shared on-call rotation supporting production systems, including occasional after-hours, weekend, and holiday coverage, with responsibility for responding to critical alerts, coordinating escalations to restore service, and documenting issues to help prevent recurrence
• Bachelor's degree in Computer Science, Cybersecurity, or a related field preferred but not required
• Relevant certifications such as OSCP, CSSLP, GWEB, or equivalent are a plus