Senior Application Security Engineer

Overview

Join to apply for the Senior Application Security Engineer role at Rain . Rain is the fastest-growing earned wage access (EWA) fintech in the U.S., serving 3.5 million employees and backed by top investors. We are seeking a skilled and driven Senior Application Security Engineer to join Rain's growing Security team. This role emphasizes secure software development, cloud-native defense, and collaboration with engineering, Cloud Security, and GRC teams to improve application and platform security posture.

This position is technically grounded, requiring direct engagement in application-layer matters and security reviews, while contributing to cloud security automation, awareness initiatives, and secure engineering practices across the SDLC.

• Collaborate with development squads to validate vulnerabilities and provide actionable remediation guidance aligned with business risk.
• Drivethe threat modeling sessions (e.g., STRIDE, PASTA) for critical systems and APIs.
• Design, implement, and oversee automated processes for securely updating application and code dependencies, proactively mitigating issues and ensuring timely vulnerability remediation.
• Integrate security checks into CI/CD pipelines (SAST, DAST, SCA, IaC), using tools like Semgrep, Snyk, Trivy, and Burp Suite.
• Contribute to runtime security initiatives, including container/Kubernetes hardening, RASP, and eBPF-based detection.
• Build and maintain a security issues dashboard to track remediation status and metrics.
• Provide real-time support during cybersecurity incidents affecting applications or cloud infrastructure.
• Partner with the Cloud Security team on security automation tasks and monitoring improvements (e.g., Security Hub remediation automations, DLP monitoring).
• Conduct proactive research on new threats, vulnerabilities, and attack techniques relevant to Rain's architecture.
• Collaborate with the GRC team to develop and deliver internal security awareness initiatives, phishing campaigns, and developer training (secure coding, API security).
• Participate in continuous improvement of AppSec maturity (e.g., OWASP SAMM, ISO 27001, SOC 2).

• Fluent English with strong verbal and written communication skills.
• Strong problem-solving and analytical mindset; ability to convey security risks to both technical and non-technical stakeholders.
• 3–5+ years of experience in application security, penetration testing roles, and/or secure code development; experience working with QA teams.
• Hands-on experience with SAST, DAST, and SCA tools (e.g., Semgrep, Burp, Snyk).
• Deep understanding of web, mobile, and API vulnerabilities (OWASP Top 10, API Top 10, MITRE CWE).
• Proven expertise in code review or security assessments and clear reporting.
• Proficiency in at least one backend language (e.g., Go, Python, Node.js) and familiarity with React/React Native front-ends.
• Familiarity with secure architecture of microservices, event-driven systems, and REST APIs using OAuth2/OpenID Connect.
• Experience securing CI/CD pipelines and integrating AppSec tooling into the SDLC.
• Solid knowledge of containerization and Kubernetes security fundamentals.
• Understanding of cloud security (preferably AWS), including IAM, cloud-native configurations, and network segmentation.
• Comfortable with Agile development and cross-functional squads.
• Software supply chain security experience (e.g., SBOM, artifact signing).

• Certifications such as OSCP, OSWE, GWAPT, CPTE, or CSSLP.
• AWS, GCP, or Azure Security Specialty certification.
• Familiarity with bug bounty triage and vulnerability management platforms (e.g., DefectDojo).
• Experience implementing RASP or eBPF runtime protection tools.
• Exposure to LLM/AI security considerations and secure code generation practices.
• Familiarity with logging and monitoring tools (e.g., CloudWatch, Datadog, Grafana).

Rain is a diverse team dedicated to our mission, with a commitment to Equal Employment Opportunity and non-discrimination based on race, religion, color, national origin, ethnicity, gender, sex (including pregnancy), protected veteran status, age, disability, sexual orientation, gender identity, or any unlawful criterion under applicable laws. If you need assistance or accommodation due to a disability, you may contact us. Rain is committed to creating an inclusive environment for all employees.

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