Senior App Security Engineer - Safeguard a Farm Platform

Halter; Auckland; On-site; NZD 120,000 - 180,000; Full time

Benefits offered by this job

Unlimited annual leave

$1,000 personal growth budget

Six months of paid parental leave

Stock ownership plan

Subsidised health insurance

Job summary

Halter is seeking a Senior Application Security Engineer to own security across the stack—from mobile code and backend systems to the firmware on the collar. You’ll define security practices, mentor engineers, and lead threat modelling in a fast-growing AWS-based environment.

With hundreds of thousands of devices and a small, experienced platform team, you’ll shape how we think about security, build robust playbooks, and drive incident readiness while preserving rapid delivery.

Responsibilities

• Proactively identify, assess, and prioritise security vulnerabilities, threats, and risks across our systems, working to implement effective mitigation strategies.
• Research, define and create threat models that can be used as a cornerstone of preparation in the application and infrastructure security landscape.
• Help define and evolve security practices and standards across the organization, balancing pragmatic risk reduction with the need for developer velocity and operational effectiveness.
• Write and maintain high-quality code and tooling to resolve known security issues and address vulnerabilities across our full engineering stack, from infrastructure to application layers.
• Provide mentorship, guidance, and technical leadership to engineers across the business, ensuring security knowledge and best practices are understood, adopted, and embedded into team workflows.
• Work closely with domain-specific engineering teams to dive deep into complex security challenges, leading investigations and developing robust solutions that scale.
• Identify, fix, and prevent vulnerabilities across the platform through proactive design reviews, secure coding practices, regular testing, and architecture improvements.
• Drive security incident response readiness, participating in detection, analysis, and resolution of security incidents while embedding learnings into future prevention strategies.
• Help define and maintain security incident response playbooks, to assist in timely and consistent response, using automation to drive efficiency.
• Maintain consistent communication and collaboration with third-party partners and vendors to ensure we are effectively leveraging external expertise, audits, and tools to meet our security goals.
• Contribute to security education and awareness initiatives, helping foster a strong culture of security across all parts of the organisation.
• Participate in a 24/7 on-call rotation, providing expert security support during incidents and working to continuously improve our operational response capabilities.

Job description

Halter is seeking a Senior Application Security Engineer to own security across the stack—from mobile code and backend systems to the firmware on the collar. You’ll define security practices, mentor engineers, and lead threat modelling in a fast-growing AWS-based environment.

With hundreds of thousands of devices and a small, experienced platform team, you’ll shape how we think about security, build robust playbooks, and drive incident readiness while preserving rapid delivery.