About this role
Creating feedback loops, evaluation systems, memory infrastructure, and decisioning primitives enables long-running artificial intelligence agents to learn from outcomes and improve over time. Sierra builds a platform for customer-facing AI agents, collaborating with major brands to transform how businesses serve customers across voice, SMS, email, and additional channels. Engineering team members design agents that pursue complex business goals over days, weeks, or months, turning zero-to-one work into reusable platforms and solving technical challenges spanning orchestration, data, memory, and observability. Successful candidates bring strong systems fundamentals, a builder mindset, and the ability to navigate ambiguous environments while collaborating directly with customers.
Operating primarily in-person out of San Francisco with growing international offices, the organization values trust, customer obsession, craftsmanship, intensity, and family balance. Practitioners who thrive here possess high agency, clear communication, and the technical judgment required to translate validated proofs-of-concept into durable product capabilities.
What you will do
- Create the feedback loops, evaluation systems, memory, signals, and decisioning infrastructure that help long-running agents learn from outcomes and improve over time.
- Design and ship agents that pursue complex business outcomes over days, weeks, or months across voice, SMS, email, and other channels.
- Identify patterns and build reusable systems, abstractions, and tools that make future Horizon agents faster and easier to launch.
- Build across orchestration, integrations, data, memory, signals, decisioning, observability, and multi-channel engagement.
- Surface platform gaps through hands-on implementation and work with product and engineering to define Horizon’s architecture and roadmap.
- Translate validated solutions into durable product capabilities and enable a successful handoff for continued deployment.
What you need
- Bring experience building and scaling end-to-end production systems.
- Demonstrate strong platform and systems engineering fundamentals.
- Possess the ability to move between customer problems, product design, and technical implementation.
- Apply strong technical judgment in ambiguous, fast-changing environments.
- Maintain a builder’s mindset and the ability to take products from zero to one.
- Communicate clearly and exhibit high agency and adaptability with at least two years of professional software engineering experience.
- Work with Python, TypeScript, or Go and React.
Nice to have
- Experience as a founder, founding engineer, or early engineer at a startup.
- Experience building workflow, orchestration, event-driven, or distributed systems.
- Experience developing platforms or reusable infrastructure for other engineers.
- Experience building or deploying AI and LLM-powered products.
- Familiarity with enterprise integrations, APIs, data pipelines, and systems of record.
Benefits
- Flexible (unlimited) paid time off
- Medical, dental, and vision benefits for you and your family
- Life insurance and disability benefits
- Retirement plan dependent on country of employment
- Parental leave
- Fertility and family building benefits through Carrot
Skills and tech stack
Questions candidates ask
Where is the company located and is the role remote?
Sierra is primarily an in-person company based in San Francisco, with growing offices across North America, Europe, and Asia.
What compensation is offered for this role?
The position includes a salary range of $230K to $390K along with offers of equity.
What programming languages and technologies are used?
Engineers build with Python, TypeScript, or Go and React.
What kind of benefits are provided for full-time employees?
Eligible full-time employees receive flexible paid time off, medical, dental, vision, life insurance, disability benefits, retirement plans, parental leave, and fertility benefits through Carrot.