Systems Security Engineer

HirexHire is hiring a Systems Security Engineer (integration-focused). In this United States (hybrid) role, you’ll serve as the technical front door for partner integrations, validating APIs early, reducing integration risk, and translating technical findings into clear product and implementation requirements. You’ll work closely with Product, Engineering, external partners, and Tier II Support across fleet management and EV infrastructure ecosystems.

Why this role

You’ll help make integrations smoother by confirming authentication, capabilities, and behaviors before engineering commits to a sprint. The work combines hands-on API discovery with product-minded requirements building, while supporting partners and internal teams through discovery, implementation, and ongoing issue triage.

Responsibilities

• Own the technical relationship with integration partners, including technical calls, support channels, credentials, documentation, and coordination on partner-side blockers.
• Perform hands-on API discovery and validation using tools such as Postman or curl, testing authentication, pagination, throttling, webhooks, error handling, and sandbox environments.
• Confirm partner APIs can support product requirements before integrations are committed to an engineering sprint by identifying gaps and proposing viable alternatives.
• Create integration briefs and working Postman collections documenting authentication, endpoints, field mappings, sample payloads, known behaviors, and outstanding questions.
• Act as the primary technical counterpart to Product for integration work, helping define technically accurate requirements, acceptance criteria, edge cases, and roadmap sequencing.
• Support Engineering during implementation as the integration subject matter expert, answering technical questions and coordinating directly with partners when additional information is needed.
• Partner with Tier II Support to reproduce and triage integration issues, determining whether problems are related to configuration, data, partner systems, or application code.
• Maintain internal documentation and reusable integration knowledge across domains such as HRIS/payroll, TMS, telematics, LMS, and job boards.
• Monitor partner API changes, deprecations, and undocumented behaviors, then communicate potential impacts to Product and Engineering.
• Own the integration discovery process to ensure each integration has validated authentication, confirmed capabilities, and the necessary technical documentation before development begins.

Requirements

• 3+ years of experience in integration engineering, solutions engineering, sales engineering, technical consulting, or a similar technical role.
• Strong understanding of REST/JSON, SOAP/XML, GraphQL, webhooks, and authentication protocols such as OAuth2, SAML, or OIDC.
• Hands-on experience using Postman, curl, or similar tools to explore, test, and validate APIs.
• Ability to read and understand code in Python, JavaScript, or a similar language (production software development experience not required).
• Strong troubleshooting and technical triage skills, with the ability to identify whether an issue originates from configuration, data, a partner system, or application code.
• Strong written and verbal communication skills to turn complex technical findings into clear documentation and actionable recommendations.
• Product-minded approach to evaluate technical limitations in the context of customer needs and identify practical alternatives.
• Confidence working directly with external technology partners, including vendors with incomplete, changing, or inconsistent API documentation.
• Strong organizational skills to manage multiple integrations, partner relationships, and technical priorities at once.
• Experience with Python, transportation technology, HRIS/payroll, TMS, telematics, or other regulated-industry integrations is a plus.

Technologies: Postman, curl, REST/JSON, SOAP/XML, GraphQL, webhooks, OAuth2, SAML, OIDC, Python, JavaScript