Senior AI Software Engineer

About Semgrep

Semgrep, the leader in code security for builders, empowers invention without friction. Teams catch, flag, and fix real issues before they ship, powered by security that learns as they build. Semgrep secures code as it’s written and provides guardrails that pave the road for developers to move fast and stay secure. Built for builders and trusted by security, Semgrep lives where developers work, delivering fixes without breaking flow, and giving security teams visibility, control, and confidence. Semgrep gets smarter as you build, with AI that learns your context to cut false positives and prioritize reachable vulnerabilities, validated by 95% of security reviewers across 6M+ findings. Semgrep makes zero false positives a reality with AppSec teams triaging 80% fewer false positives across Code and Supply Chain, dramatically shrinking the backlog. Founded in San Francisco and backed by Menlo Ventures, Felicis Ventures, Lightspeed Venture Partners, Redpoint Ventures, and Sequoia Capital, Semgrep is recognized by Gartner in Application Security Testing and is trusted by leading organizations, including Vanta, Lyft, and Dropbox.

About the Role

As an AI engineer, you’ll apply LLM technologies throughout our stack to enhance Semgrep’s security vulnerability detection, prioritization, and remediation capabilities. You will work directly with customers to understand their pain points, own the end-to-end implementation of AI-powered solutions, and rigorously evaluate the efficacy of different prompts and models through experimentation with real-world data. If you are comfortable working with significant ambiguity, like prototyping and shipping quickly, and enjoy working on a little bit of everything throughout the stack—this is the role for you.

Our stack utilizes various LLMs including GPT-4/GPT-5, Codex, and Claude; TypeScript and React on the Frontend; Python, Flask, and SQLAlchemy on the Backend; and is deployed via Kubernetes and hosted on AWS. Professional experience with these technologies is preferred but not required, provided you are open to learning them quickly.

This is a hybrid role with the expectation you join us 3+ days per week in our San Francisco, New York, Boston, or Denver offices, depending on the team. Remote employment will be considered for exceptional candidates as well.

Responsibilities

• Apply LLM technologies to enhance Semgrep’s security vulnerability detection, prioritization, and remediation capabilities.
• Work directly with customers to understand their pain points.
• Own the end-to-end implementation of AI-powered solutions.
• Rigorously evaluate the efficacy of different prompts and models through experimentation with real-world data.
• Prototype and ship quickly across the full stack.

Qualifications

• Comfort working with significant ambiguity.
• Experience with or willingness to quickly learn: LLMs (GPT-4/GPT-5, Codex, Claude), TypeScript, React, Python, Flask, SQLAlchemy, Kubernetes, and AWS.

Pay

The estimated starting annual salary range for this position is $163,000 to $246,500 USD. The actual base salary will be determined based on job-related skills, relevant experience, qualifications, location, internal equity, and market data. In addition to base salary, total compensation may include equity, variable compensation, and benefits. Equity is a meaningful part of our compensation philosophy and a way for employees to share in the long-term value they help create.

Benefits

We invest in our employees’ well-being and long-term success through a competitive, market-aligned benefits program that meets or exceeds local market standards across all regions in which we hire. Benefits offerings vary by location to reflect local requirements and norms. For detailed, location-specific information, visit Semgrep Benefits.

Who We Are

We bring together people from a wide range of backgrounds and disciplines—from physics and philosophy to formal methods research and full-fledged corporations. We’re new parents and new grads, dog lovers and dogfooders. We get together often to bike, bake, and meet up in parks. In our interactions, we believe respect and honesty go hand in hand, and prioritize both.

Semgrep is an equal-opportunity employer seeking a diverse range of backgrounds. We value who you are—including your cultural heritage, socioeconomic status, age, race, gender, sexual orientation, and disabilities. We value what’s vitally important to you—your family, religion, and politics. We value what you love in this world—your music and weekend pursuits. We believe in welcoming varied professional backgrounds, educations, and interests. If you’re exceptional in your role, believe in Semgrep’s mission, and treat Semgrep’s values as your own, you belong here.