Software Engineer, Horizon
Sierra · San Francisco, CA
About this role
## About Sierra Sierra is the leading platform for customer-facing AI agents, working with major brands including **The GAP, Rocket Mortgage, SoFi, Sutter Health,** and **SoftBank** to transform how they serve customers and grow their businesses. Sierra is primarily **in-person** in **San Francisco**, with growing offices across **North America, Europe, and Asia**. Our culture is guided by our values: **Trust, Customer Obsession, Craftsmanship, Intensity,** and a commitment to balancing **Family**. ## What you’ll do - **Build primitives for self-improvement:** Create feedback loops, evaluation systems, memory, signals, and decisioning infrastructure so long-running agents learn from outcomes and improve over time. - **Build the future of long-horizon agents:** Design and ship agents that pursue complex business outcomes over **days, weeks, or months** across **voice, SMS, email,** and other channels. - **Turn 0-to-1 work into a platform:** Identify patterns and build reusable systems, abstractions, and tools to make future Horizon agents faster and easier to launch. - **Solve technically complex problems:** Work across orchestration, integrations, data, memory, signals, decisioning, observability, and multi-channel engagement. - **Shape the Horizon product:** Surface platform gaps through hands-on implementation and partner with product and engineering on Horizon’s architecture and roadmap. - **Create a clean path beyond the POC:** Once validated, translate solutions into durable product capabilities and enable a successful handoff for continued deployment. ## What you’ll bring - Experience building and scaling **end-to-end production systems** - Strong **platform and systems engineering** fundamentals - Ability to move between **customer problems, product design, and technical implementation** - Strong technical judgment in **ambiguous, fast-changing** environments - A **builder’s mindset** and ability to take products from **zero to one** - Comfort working directly with customers and understanding complex business processes - **High agency**, adaptability, and clear communication - At least **two years** of professional software engineering experience - Experience with **Python, TypeScript, or Go** and **React** ### Even better - Experience as a **founder/founding engineer/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 - Experience working in complex industries such as **financial services** or **healthcare** ## Our values - **Trust:** Accountability, empathy, quality, responsiveness; making AI more accessible, safe, and useful. - **Customer Obsession:** Focus on outcomes; everyone spends time with customers and fixes issues quickly. - **Craftsmanship:** Get the details right; good taste; self-reflect and continuously improve. - **Intensity:** Play to win; fix what isn’t working; talk openly about failures without blame. - **Family:** Balance intensity with respect and support—especially for parents. ## What we offer (full-time employees) - **Flexible (unlimited) paid time off** - **Medical, dental, and vision** for you and your family - **Life insurance** and **disability** benefits - **Retirement plan** (dependent on
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