Senior Security Engineer, Product Security

📅 Aug 28

📍 🇺🇸 United States - Remote💰 $160.9k - $186.6k / year🎸 Senior 📏 Cybersecurity Engineer 💼 Full-Time

Product SecurityApplication SecurityLLM SecurityPrompt Injection Testing

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📜 Description

Adversarially test LLM applications and agents, then turn findings into actionable launch criteria.
Build and operate production security services and internal tools across TypeScript, Node.js, .NET, and Python.
Threat model product requirements and technical designs; review pull requests and investigate security findings.
Manually test web applications and APIs, validate exploitability, and retest fixes.
Maintain AppSec tooling, automate security workflows, and secure supporting infrastructure with infrastructure as code.
Support security investigations, threat hunting, incident response, vulnerability management, and engineer training.

🛠️ Requirements

Strong backend engineering experience and a production service others depend on; familiarity with async patterns, HTTP APIs, and streaming transports.
Ability to review code across multiple languages and stacks, validate findings, and recommend actionable fixes.
Knowledge of identity and authorization, including OAuth, token scopes, sessions, SSRF, and DNS rebinding.
Experience securing REST and GraphQL APIs, including input validation, rate limiting, authentication, and service-to-service verification.
Hands-on manual testing of web applications and APIs, including clear findings and retesting.
Ability to threat model written designs and identify trust boundaries and data flows.
Working AWS and infrastructure-as-code skills, including IAM, secrets, containers, and network egress controls.
Practical experience attacking an LLM-backed application or agent; strong communication with non-security audiences.

Full job description

About GoodLeap:

GoodLeap is a technology company delivering best-in-class financing and software products for sustainable solutions, from solar panels and batteries to energy-efficient HVAC, heat pumps, roofing, windows, and more. Over 1 million homeowners have benefited from our simple, fast, and frictionless technology that makes the adoption of these products more affordable, accessible, and easier to understand. Thousands of professionals deploying home efficiency and solar solutions rely on GoodLeap’s proprietary, AI-powered applications and developer tools to drive more transparent customer communication, deeper business intelligence, and streamlined payment and operations. Our platform has led to more than $30 billion in financing for sustainable solutions since 2018.

GoodLeap is also proud to support our award-winning nonprofit, GivePower, which is building and deploying life-saving water and clean electricity systems, changing the lives of more than 1.6 million people across Africa, Asia, and South America.

Position Overview

GoodLeap’s security team safeguards the organization’s information assets while enabling the business — spanning product safety and resilience, security paved roads, customer and regulatory trust, and technology governance. As a Senior Product Security Engineer, you’ll partner with product and engineering teams to make what we ship safe by default, splitting your time between building production security services and reviewing what other teams build: designs before code exists, pull requests before merge, and running systems before someone else finds the problem. You’ll be the primary security partner for one or more business units — GRC, security operations, and monitoring carry their own parts of the mandate, but you own the product security outcome.

GoodLeap builds in TypeScript, Node.js, .NET, and Python, and you’ll work across all of it — we care that you can move between stacks, not that you’ve spent your career in one. We’re also shipping LLM-backed and agentic features into a regulated consumer-finance product; adversarially testing those systems (prompt injection, jailbreaks, tool abuse, exfiltration) and helping define what’s “safe enough to launch” is core to this role. You don’t need years of AI security experience — you need to show you can take an unfamiliar system, reason about how it fails, and produce findings a product team will act on.

About GoodLeap: GoodLeap is a technology company delivering best-in-class financing and software products for sustainable solutions, from solar panels and batteries to energy-efficient HVAC, heat pumps, roofing, windows, and more. Over 1 million homeowners have benefited from our simple, fast, and frictionless technology that makes the adoption of these products more affordable, accessible, and easier to understand. Thousands of professionals deploying home efficiency and solar solutions rely on GoodLeap’s proprietary, AI-powered applications and developer tools to drive more transparent customer communication, deeper business intelligence, and streamlined payment and operations. Our platform has led to more than $30 billion in financing for sustainable solutions since 2018. GoodLeap is also proud to support our award-winning nonprofit, GivePower, which is building and deploying life-saving water and clean electricity systems, changing the lives of more than 1.6 million people across Africa, Asia, and South America. Please note: This role is not eligible for visa sponsorship. Additional Information Regarding Job Duties and Job Descriptions: Job duties include additional responsibilities as assigned by one's supervisor or other managers related to the position/department. This job description is meant to describe the general nature and level of work being performed; it is not intended to be construed as an exhaustive list of all responsibilities, duties and other skills required for the position. The Company reserves the right at any time with or without notice to alter or change job responsibilities, reassign or transfer job position or assign additional job responsibilities, subject to applicable law. The Company shall provide reasonable accommodations of known disabilities to enable a qualified applicant or employee to apply for employment, perform the essential functions of the job, or enjoy the benefits and privileges of employment as required by the law. If you are an extraordinary professional who thrives in a collaborative work culture and values a rewarding career, then we want to work with you! Apply today! We are committed to protecting your privacy. To learn more about how we collect, use, and safeguard your personal information during the application process, please review our Employment Privacy Policy and Recruiting Policy on AI.

Essential Job Duties and Responsibilities

Adversarially test our AI and LLM-backed features. Design and run attacks against LLM-backed applications and agents — prompt injection, jailbreaks, tool abuse, data exfiltration — and turn findings into pass/fail criteria product teams will act on.

Build and operate production security services. Backend services and internal tooling — APIs, streaming transports, proxy/CLI/chat interfaces — in whichever of TypeScript, Node.js, .NET, or Python fits the problem, held to the same bar as any other production service: test coverage, CI, dependency management.

Find new ways to automate the work. Notice when something we do by hand has become automatable, prototype it, and make the case— even when it means replacing a tool we bought last year.

Review pull request vulnerability findings. Triage what scanning and AI-assisted review surface across our stacks, separating real findings from noise. Go deep by hand on auth paths and high-risk changes, and feed what you learn back into the tooling.

Threat model from product designs. Review PRDs and technical designs before code exists, infer trust boundaries and data flows in unfamiliar domains, and raise security questions while the design is still cheap to change.

Test by hand and validate what you find. Manual testing of web applications and APIs, triage for real exploitability, and retest fixes. Support the red team’s bug bounty and continuous penetration testing programs.

Keep the AppSec tooling estate running and low-friction. SAST/dependency scanning tuning, finding triage and routing, SSO and access management, and automating the repetitive parts so the program scales without headcount.

Secure the infrastructure your tooling runs on. IAM least-privilege scoping, secrets management, and container/network lifecycle — as infrastructure as code, with automated drift checks.

Enable engineers to do the right thing. Build security training and documentation engineers will actually use.

Evaluate tools and help set the AI bar. Run structured bake-offs of security products against defined requirements and help set the standards AI/agent systems must satisfy before reaching production.

Back up the rest of the security team. Support investigations, threat hunting, and incident response for the products you cover, and contribute to the vulnerability management lifecycle and security analytics platform.

Required Skills, Knowledge, and Abilities

You ship production code. Strong backend engineering in at least one modern language, with at least one service you built that others depend on — async patterns, HTTP APIs, and streaming transports are familiar ground. We work across TypeScript, Node.js, .NET, and Python; depth in one plus the willingness to move between them matters more than any particular stack on your résumé.

You can read code you didn’t write, across more than one language and stack, well enough to judge whether a reported finding is real, catch the ones tooling missed, and propose a fix the engineer can act on.

You know how identity and authorization actually fail: token exchange and scope handling, session lifetime and revocation, request signing, OAuth pitfalls, and network-layer issues like SSRF and DNS rebinding. We’re looking for reasoning that finds real bugs, not checklist recall.

You understand API standards and how to secure them: REST and GraphQL in practice, OpenAPI and schema contracts, input validation, rate limiting, gateway-level auth, and webhook and service-to-service verification.

Hands-on testing of web applications and APIs — manual, not just scanner-driven — plus the triage, the clear write-up, and the retest.

Threat modeling from written designs. You can read a PRD in an unfamiliar domain, infer trust boundaries and data flows, and ask the right questions while the answer is still cheap.

Working AWS and infrastructure-as-code competence: IAM scoping, secrets management, container/compute lifecycle, network egress control, and infrastructure defined as code.

Practical exposure to AI/LLM security. You have attacked an LLM-backed application or agent — at work, in a CTF, in published research, or in your own lab — and can tell us what you found and why it worked.

You write and speak for people who are not in security. Findings engineers act on, documentation they use, and explanations that hold up in front of a product manager, an executive, or Legal.

Preferred:

Having owned an AppSec tooling estate: SAST/SCA tuning, finding routing, false-positive reduction

Running structured vendor evaluations or proofs of concept

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