Senior Software Engineer

Magical; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

Magical is seeking a Senior Engineer to build and own their AI agent systems in San Francisco. This hybrid role involves setting technical direction, improving system reliability, and mentoring teammates.

The ideal candidate has over 5 years of software development experience and a strong background in systems design. Responsibilities include building automation workflows and managing critical services from architecture to deployment.

Qualifications

• 5+ years of software development experience.
• Experience building backend systems in production.
• Strong systems design skills including distributed systems and APIs.

Responsibilities

• Design and build backend and full-stack systems for AI agents.
• Set technical direction within a project, especially with ambiguous requirements.
• Improve runtime reliability through robust systems for management and alerts.

Skills

Software development experience

Systems design skills

Integration of AI tools

Bias for action and quick iteration

Job description

About the Role

As a Senior Engineer at Magical, you'll build and own the systems powering our AI agents. You'll set technical direction for projects, drive delivery, enhance your team’s effectiveness, and take end-to-end ownership of core systems.

Our platform orchestrates long-running, high-stakes healthcare workflows—managing queues, run state, browser automation, model calls, evaluations, observability, and human-in-the-loop recovery.

You'll help transform unstructured customer inputs—SOPs, decision trees, portal behaviors, and edge cases—into dependable automations. You’ll build systems that can draft, test, and enhance workflows, catch failures, recommend edits, and know when human intervention is needed. You'll also contribute to improving runtime reliability, workflow pathways, evaluations, and specialized agents for critical healthcare tasks.

This is a hybrid role based in our San Francisco office.

What You’ll Do

• Design and build backend and full-stack systems for AI agents and healthcare automations

• Set technical direction within a project or product area, especially when requirements are ambiguous

• Build features for automation creation, workflow pathways, testing, editing, and production run reporting

• Improve runtime reliability through systems for run state management, queues, idempotency, error classification, alerts, and dashboards

• Own critical services from architecture through deployment, monitoring, and iteration

You May Be a Fit If

• You have 5+ years of software development experience.

• You’ve built and owned backend systems deployed in production

• You can turn ambiguous product requirements into a clear technical plan

• You have strong systems design skills—distributed systems, databases, APIs, queues, async workflows, and observability

• You’ve integrated AI tools into your development workflow and are willing to experiment with new approaches

• You have a strong bias for action—you ship, learn, prioritize ruthlessly, and iterate quickly

• You take full ownership of your systems and enjoy mentoring teammates

Even Better If

• You have experience building platform, infrastructure, or workflow systems at scale

• You have built agentic products or agent-based workflows

• You’ve integrated LLMs or AI models into production backend systems

• You have a background in event-driven architectures, workflow engines, observability, or runtime reliability

• You have experience in healthcare operations or revenue cycle management