Sierra

Software Engineer Horizon (AI)

In short

This role builds feedback, evaluation, memory, signal, and decisioning systems for long-running AI agents operating across voice, SMS, email, and other channels. The company is Sierra, a product company, and the work spans orchestration, integration, data, and observability problems while shaping product architecture through implementation. It requires at least two years of professional software engineering experience with Python, TypeScript, or Go and React, plus strong platform/systems engineering fundamentals and comfort with ambiguity.

About the Role
You will build feedback, evaluation, memory, signal, and decisioning systems for long-running agents. You will design agents across multiple channels, turn early solutions into reusable platform capabilities, and work with customers on complex business problems.
Requirements
•Experience building and scaling end-to-end production systems
•Platform and systems engineering fundamentals
•Ability to move between customer problems, product design, and implementation
•Technical judgment in ambiguous environments
•At least two years of professional software engineering experience
•Experience with Python, TypeScript, or Go and React
Responsibilities
•Build feedback loops, evaluation systems, memory, signals, and decisioning infrastructure
•Design and ship long-horizon agents across voice, SMS, email, and other channels
•Build reusable systems, abstractions, and tools
•Solve orchestration, integration, data, observability, and engagement problems
•Shape product architecture and roadmap through implementation
•Translate validated solutions into durable product capabilities
Benefits
•Unlimited paid time off
•Medical, dental, and vision benefits for employees and their families
•Life insurance and disability benefits
•Retirement plan dependent on country of employment
•Parental leave
•Fertility and family-building benefits through Carrot
•Lunch, snacks, and coffee
•Discretionary benefit stipend
•Free alphorn lessons
•Equity plans

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