Senior Backend Engineer - Platform & AI Agents

Fountain; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Flexible vacation policy

Paid holidays

Monthly lunch stipends

Ongoing education allowances

Home office reimbursement

Cell phone reimbursement

Wellness reimbursement

Job summary

Fountain is hiring for a backend-focused engineer to help scale our workforce management platform. You will own production-grade systems, drive architectural decisions for human and agentic interfaces, and collaborate with product and design teams to deliver impact for hundreds of customers worldwide.

The role emphasizes autonomous work in a fast-paced environment, with an emphasis on performance, observability, and secure, reliable APIs used by agents and humans alike.

Qualifications

• 5+ years in a professional engineering role focusing on backend development.
• Strong track record of launching production-ready systems.
• Experience with agentic or LLM-based systems beyond consumer use.

Responsibilities

• Ship platform capabilities across all customer and internal products.
• Own performance, security, and stability for high-traffic production systems.
• Lead architectural decisions for human and agentic interfaces.
• Design reliable code, APIs, and contracts for humans and agents.
• Collaborate with product and engineering teams to deliver customer impact.

Skills

Backend development

Systems design

LLM-based systems

Architectural decisions

Job description

Fountain is hiring for a backend-focused engineer to help scale our workforce management platform. You will own production-grade systems, drive architectural decisions for human and agentic interfaces, and collaborate with product and design teams to deliver impact for hundreds of customers worldwide.

The role emphasizes autonomous work in a fast-paced environment, with an emphasis on performance, observability, and secure, reliable APIs used by agents and humans alike.