Senior Application Security Engineer

Sardine; United States; Remote; USD 140,000 - 210,000; Full time

Benefits offered by this job

Generous cash and equity compensation

Remote-first culture

Flexible PTO

Job summary

Sardine is seeking an experienced Application Security Engineer to own and automate vulnerability management across multi-cloud services. You will triage, route, and close findings from SAST/DAST/SCA, write static analysis rules, and reduce root causes with secure defaults.

The role emphasizes collaboration across teams and hands-on testing of APIs and services. You will drive threat modeling, enable security champions, and collaboratively improve platform security in a remote-first, US-based

Qualifications

• Experience running vulnerability management end to end.
• Engineering background with shipped software.
• Ownership to complete fixes across teams.
• Judgment over tenure; depth of technical judgment.
• Proficient in Go, Python, Node.js, Ruby, or Java.
• Strong OWASP Top 10 focus on access control and business logic.
• Familiar with SAST, DAST, SCA in CI/CD.
• Cloud fundamentals on AWS or GCP.
• Ability to separate real findings from theory.

Responsibilities

• Triage, validate, route, and drive remediation of findings from all sources (SAST, DAST, SCA, code review, pentests, bug bounty).
• Build automation to remove manual effort from those steps.
• Direct external pentests and bug bounty scope, severity, and closure.
• Spot patterns across findings and remove root causes, not just fixes.
• Set secure defaults and patterns to make the right path easy for engineers.
• Write custom static analysis rules (Semgrep, CodeQL) to fix classes long-term.
• Review platform controls (authorization, secrets handling) and push for fixes.
• Collaborate with engineers on fixes that are simple, adopted, and lasting.
• Hands-on testing of apps and APIs, with depth in authorization and business logic.
• Threat modeling on new/high-exposure designs; security enablement across engineering.

Skills

Vulnerability management

Security automation

Go/Python/JS/Java

Threat modeling

OWASP Top 10

CI/CD security tooling

Docker and Kubernetes

Code auditing

Asynchronous collaboration

Ownership to done

Tools

Semgrep

CodeQL

Jenkins

GitHub Actions

Job description

Who we are:

Sardine is the leading agentic risk platform for fighting financial crime. Our integrated solution unifies data across risk teams to help organizations stop fraud in real time, prevent AI-driven attacks, and automate fraud and AML operations. Sardine’s platform is strengthened by one of the fastest-growing fraud consortiums in the market, spanning more than 6 billion profiled devices, 800 million consumers, and 3 million businesses worldwide. Leading companies including FIS, GoDaddy, Intuit, Edward Jones, ZoomInfo, and Checkout.com rely on Sardine to secure and grow trust in their products.

Our culture:

• We hire talented, self-motivated individuals with extreme ownership and high growth orientation.

• We value performance and not hours worked. We believe you shouldn't have to miss your family dinner, your kid's school play, friends get-together, or doctor's appointments for the sake of adhering to an arbitrary work schedule.

• We're a remote-first team spread across time zones, so no office to report to - work from wherever helps you do your best work. Just a couple of things to keep in mind: pay is based on where you're located, and you'll need to keep a home base in the country you're hired in. So while we love the "coffee shop today, mountains tomorrow" life, this isn't a passport-optional, work-from-anywhere-on-Earth kind of remote - think flexible within your country, not borderless.

Location:

• Remote - United States

The role

Sardine makes risk and payment decisions for banks and fintechs. Our customers audit us closely, and application security is a large part of what they examine.

Money moves through this platform, so real adversaries study it. Your job is to find what they would find, especially authorization flaws and business logic abuse, and then make the whole class of bug go away.

The application security team is small. The estate is large: Go, Node.js, Python, Ruby, and Java services running on multi-cloud and Kubernetes. That ratio shapes the work. Findings arrive from scanners, code review, testing, threat modeling, pentesters, and bug bounty hunters. You turn that stream into a pipeline that validates, routes, and closes issues with as little manual effort as possible. Then you use what the pipeline tells you to remove root causes: secure defaults, patterns engineers reach for first, and fixes that hold.

Little here is pre-decided. You determine where the risk is and go after it.

The work

Where most of your time goes

Running and automating the vulnerability pipeline

• Triage, validate, route, and drive remediation of findings from every source: SAST, DAST, SCA, code review, pentests, and bug bounty

• Build the automation that removes manual effort from each of those steps

• External pentests and bug bounty program: set scope, direct the testers, judge severity, and close the loop

Making bug classes go away

• Spot the patterns across findings and remove the root cause, not just the instance

• Set the secure patterns and defaults that make the right way the easy way

• Write custom static analysis rules for our own anti-patterns, so a fixed bug class stays fixed

• Review platform-layer controls (authorization, service identity, secrets handling, gateway enforcement), find the gaps, and push the owning teams until they are closed

• Work alongside engineers on fixes that are simple, get adopted, and hold

Also part of the job

• Hands-on testing of our applications and APIs, and manual code review of high-exposure services, with depth in authorization and business logic

• Threat modeling on new and high-exposure designs

• Security enablement across engineering, including a security champions program

What we're looking for

• Vulnerability management, automated. Experience running vulnerability management end to end, and automating it with code against scanner, ticketing, and source-control APIs

• An engineering background. You have shipped and maintained real software. You read unfamiliar code quickly, review it rigorously, and reason about architecture and failure modes.

• Ownership to done. You take problems all the way through, including fixes that depend on other teams. You follow up on the fix you recommended three sprints ago.

• Judgment over tenure. We care more about the depth of your judgment than your years of experience.

• Code auditing in at least one of Go, Python, Node.js, Ruby, or Java, and the willingness to work in the rest

• Practical command of the OWASP Top 10, with real depth in broken access control and business logic flaws

• SAST, DAST, and SCA in CI/CD, tuned so engineers trust the output. Cloud fundamentals on GCP or AWS. Docker and Kubernetes.

• You separate real findings from theoretical ones.

• You disagree in the open, with evidence, and update when someone brings better evidence.

• Your influence travels asynchronously, across time zones, to people with strong opinions and no reporting line to you.

Bonus

• Scaling security tooling across many repositories, languages, and build systems

• Prior experience writing custom static analysis rules (Semgrep, CodeQL, or similar)

• Fintech, payments, or other environments under serious third-party security review (PCI DSS, SOC 2, customer audits)

• Fully distributed, asynchronous engineering experience

• Offensive experience in whatever form you found it. Pentesting on web, API, mobile, or cloud is the most directly relevant. Hardware and embedded work, physical security and lock sport, red team engagements, protocol and radio work, and CTF or bug bounty results all count.

• Advanced offensive certifications. OSWE and BSCP are the most relevant; CPTS, CRTO, and similar also count.

• Public work: research, tooling, disclosures, talks

Benefits we offer:

• Generous compensation in cash and equity

• Early exercise for all options, including pre-vested

• Work from anywhere: Remote-first Culture

• Flexible paid time off and Year-end break

• Health insurance, dental, and vision coverage for employees and dependents - US and Canada specific

• 4% matching in 401k / RRSP - US and Canada specific

• MacBook Pro delivered to your door

• One-time stipend to set up a home office — desk, chair, screen, etc.

• Monthly meal stipend

• Monthly social meet-up stipend

• Annual health and wellness stipend

• Annual Learning stipend

Join a fast-growing