Senior Software Engineer III (Full Stack)
$175,000–$225,000 year
RemoteUnited States
Job Summary
Design, build, and maintain full-stack product features across the company's global payments platform, owning architecture, implementation, and deployment. Develop scalable backend services, APIs, and cloud infrastructure supporting enterprise financial workflows, while creating intuitive frontend experiences using React and TypeScript. Partner directly with enterprise customers to understand requirements and influence roadmap decisions, leveraging AI-native engineering tools to accelerate development. Contribute to architectural decisions and engineering standards, collaborating closely with product leadership and founders in a small, high-ownership team. Help shape engineering culture while mentoring teammates as the organization grows.
Required Qualifications
- 5–10 years of professional full-stack software engineering experience
- Experience building production fintech, payments, payroll, or HR technology products
- Strong proficiency with TypeScript, React, and Node.js
- Experience designing APIs, backend services, cloud infrastructure, and scalable data models
- Proven track record shipping full-stack products end-to-end within startup environments
- Experience working directly with enterprise customers to gather feedback and shape product direction
- Comfortable using AI-assisted development tools such as Claude Code, Cursor, Codex, or similar as part of daily engineering workflows
- Strong software architecture skills with the ability to make pragmatic technical decisions
- Excellent communication skills and the ability to collaborate across engineering, product, and customer teams
- High ownership mindset with a passion for building products from concept to production
- Based in or willing to regularly collaborate from New York City or Denver
Desired Qualifications
- Experience with AI agents, agentic workflows, or AI-powered software development pipelines
- Background building developer platforms, fintech infrastructure, or enterprise SaaS products
- Familiarity with modern CI/CD practices and cloud-native application development
- Startup experience with significant ownership across product and engineering decisions
- Strong interest in engineering leadership and helping scale technical organizations
- Experience balancing security, compliance, and product velocity in regulated industries
- Comfortable working in small, highly collaborative engineering teams
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