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Staff Software Engineer, Agentic Integrations

Flex is a growth-stage NYC-headquartered fintech building a modern rent payment experience that gives renters flexibility over their largest recurring expense. The Staff Software Engineer will join Partner Engineering to shape and implement the technical roadmap for an Agentic payments platform across APIs, SDKs, and web experiences, collaborating cross-functionally to deliver high-quality, scalable products.

Skills

  • Proven experience delivering complex products end-to-end
  • Systems design for scalable, distributed architectures
  • API and SDK design and implementation
  • Proficiency in Python, Golang, or Node.js and asynchronous programming
  • Experience with WebSockets, request routing, and networking protocols
  • Familiarity with CI/CD systems, automation, and git workflows
  • Practical understanding of LLMs, agentic workflows, or prompt-driven systems (preferred)
  • Strong cross-functional communication and collaboration
  • Production debugging, monitoring, and incident response
  • Mentorship and raising engineering standards

Responsibilities

  • Define technical roadmap and lead architecture for Agentic payments platform components (APIs, SDKs, web).
  • Deliver multiple high-impact projects end-to-end, from design through production and maintenance.
  • Write and review high-quality, production-ready code; be hands-on in implementation.
  • Collaborate with Product, Design, Infrastructure, Sales, Partners, and Customer Success to align scope and delivery.
  • Build and maintain scalable, asynchronous systems and integration pipelines.
  • Design and integrate LLM-driven/agentic workflows into consumer-facing experiences and backend services.
  • Establish and elevate engineering best practices, CI/CD, testing, and observability.
  • Mentor and grow junior and mid-level engineers, improving team standards and processes.

Education

  • Bachelor’s degree in Computer Science or related field, or equivalent practical experience

Benefits

  • Competitive pay
  • 100% company-paid medical, dental, and vision (U.S.-based)
  • 401(k) and company equity
  • Unlimited paid time off plus 13 company-paid holidays (U.S.-based)
  • Parental leave
  • Flex Cares Program
  • Free Flex subscription
  • Competitive pay, company equity, and unlimited PTO for full-time non-U.S. employees
To read the complete job description, please click on the ‘Apply’ button
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CEO of Flex
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Revathi Advaithi
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Average salary estimate

$230500 / YEARLY (est.)
min
max
$199000K
$262000K

If an employer mentions a salary or salary range on their job, we display it as an "Employer Estimate". If a job has no salary data, Rise displays an estimate if available.

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FUNDING
SENIORITY LEVEL REQUIREMENT
TEAM SIZE
SALARY RANGE
$199,000/yr - $262,000/yr
EMPLOYMENT TYPE
Full-time, remote
DATE POSTED
November 4, 2025
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