Unit21 · 3 weeks ago
Application Security Engineer \- SF \- Hybrid Preferred, Remote O.K.
San Francisco, California, United States
Full-time
Hybrid
Mid, Senior Level
$16K/yr - $175K/yr
4+ years expUnit21 is a rapidly growing Series C startup focused on leveraging data to combat fraud and enhance security. The Senior Application Security Engineer will be responsible for designing and implementing security systems, conducting threat modeling, and mentoring product engineers on secure coding practices.
ComplianceDeveloper APIsFraud DetectionRisk ManagementSoftware
Responsibilities
Design, code, and deploy automated security controls, services, and frameworks to prevent vulnerabilities at scale
Build, own, and operate the tools and infrastructure for our application security program, including Static Application Security Testing (SAST), Dynamic Application Security Testing (DAST), Software Composition Analysis (SCA), and secret scanning solutions
Perform hands-on threat modeling, security architecture reviews, and in-depth code reviews (Python/TypeScript) for new products and critical features to ensure they are secure by design
Conduct penetration tests and vulnerability assessments against our applications and APIs to proactively identify and remediate security weaknesses
Develop custom tools and automation to streamline security operations and enhance our detection and response capabilities
Act as a key member of our incident response team during security events
Mentor and educate product engineers on secure coding best practices, acting as a subject matter expert and fostering a culture of security ownership
Qualification
Required
4+ years of hands-on experience in a software engineering or application security role, with a proven track record of shipping code and building security solutions
Demonstrated history of successful cross-organizational efforts and the ability to drive complex technical projects to completion
Expert-level proficiency in Python, including experience building security tools, automation scripts, or backend services
Deep, hands-on knowledge of common application vulnerabilities, such as the OWASP Top 10, and their mitigation techniques
Proven experience integrating, fine-tuning, and operating security tools (e.g., SAST, DAST, SCA) within developer workflows
Experience conducting manual penetration tests and vulnerability assessments on web applications and APIs
Hands-on experience securing public cloud environments (AWS or GCP)
Basic proficiency with Infrastructure as Code (e.g., Terraform) and containerization technologies (e.g., Docker, ECS, or Kubernetes), including best practices for securing them
Preferred
Professional experience with Go or TypeScript is a significant plus
Previous experience implementing protections for Generative AI systems is a significant plus
Benefits
Competitive salary and pre-IPO stock options
100% company-paid medical, dental and vision insurance (for employee)
Optional HSA and FSA medical reimbursement accounts
Unlimited paid time off
Generous leave programs for life events
401(k)
Charity matching
Annual Learning & Development stipend
One-time Home office set-up stipend
Commuter benefits
Wellness Bundle: One Medical, Headspace, Gympass and Carrot Fertility
Happy hours and team-building events
Great office space in the San Francisco Financial District
Fully stocked kitchen
Lunch and dinner provided in SF office at least 3x per week
A great company culture with a strong emphasis on diversity, equity and inclusion
Company
Unit21
Unit21 is a no-code platform for risk and compliance operations.
51-200 employees
H1B Sponsorship
Unit21 has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (3)
2024 (9)
2023 (2)
2022 (2)
2021 (4)
Funding
Current Stage
Growth StageTotal Funding
$92MKey Investors
Tiger Global ManagementA.Capital VenturesGradient
2022-06-29Series C· $45M
2021-07-07Series B· $34M
2020-10-19Series A· $13M
Leadership Team
Trisha Kothari
CEO, founder
Recent News
Company data provided by crunchbase