5-7 years of experience in software engineering or related fields.
Strong foundation in platform and systems engineering.
Ability to navigate customer needs, product design, and technical execution.
Proven technical judgment in dynamic environments.
Builder's mindset with experience in developing products from inception to launch.
Excellent communication skills and adaptability.
Proficiency in Python, TypeScript, Go, and React.
Responsibilities
Create feedback loops and evaluation systems for long-running agents.
Design and implement agents for complex business outcomes across multiple channels.
Identify patterns to build reusable systems and tools for future agents.
Address complex technical challenges in orchestration and multi-channel engagement.
Collaborate with product and engineering teams to shape the Horizon architecture.
Translate validated solutions into sustainable product capabilities for deployment.
Benefits
Unlimited paid time off for flexibility.
Comprehensive medical, dental, and vision coverage for employees and families.
Life insurance and disability benefits included.
Retirement plan options based on employment location.
Generous parental leave policy.
Fertility and family-building support through Carrot.
Complimentary lunch and snacks to maintain energy levels.
Discretionary stipend for personal spending needs.
Unique offering of free alphorn lessons.
Full Job Description
What you'll do
Build primitives for self improvement: Create the feedback loops, evaluation systems, memory, signals, and decisioning infrastructure that help 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 that make future Horizon agents faster and easier to launch.
Solve technically complex problems: Build across orchestration, integrations, data, memory, signals, decisioning, observability, and multi-channel engagement.
Shape the Horizon product: Surface platform gaps through hands-on implementation and work with product and engineering to define Horizon's architecture and roadmap.
Create a clean path beyond the POC: Once a solution is validated, translate what you built 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.
The ability to move between customer problems, product design, and technical implementation.
Strong technical judgment in ambiguous, fast-changing environments.
A builder's mindset and the 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, 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.
Experience working in complex industries such as financial services or healthcare.
Our values
Trust: We build trust with our customers with our accountability, empathy, quality, and responsiveness. We build trust in AI by making it more accessible, safe, and useful. We build trust with each other by showing up for each other professionally and personally, creating an environment that enables all of us to do our best work.
Customer Obsession: We deeply understand our customers' business goals and relentlessly focus on driving outcomes, not just technical milestones. Everyone at the company knows and spends time with our customers. When our customer is having an issue, we drop everything and fix it.
Craftsmanship: We get the details right, from the words on the page to the system architecture. We have good taste. When we notice something isn't right, we take the time to fix it. We are proud of the products we produce. We continuously self-reflect to continuously self-improve.
Intensity: We know we don't have the luxury of patience. We play to win. We care about our product being the best, and when it isn't, we fix it. When we fail, we talk about it openly and without blame so we succeed the next time.
Family: We know that balance and intensity are compatible, and we model it in our actions and processes. We are the best technology company for parents. We support and respect each other and celebrate each other's personal and professional achievements.
What we offer
We want our benefits to reflect our values and offer the following to full-time employees:
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
Lunch, as well as delicious snacks and coffee to keep you energized
Discretionary benefit stipend giving people the ability to spend where it matters most
Free alphorn lessons
These benefits are further detailed in Sierra's policies, may vary by region, and are subject to change at any time, consistent with the terms of any applicable compensation or benefits plans. Eligible full-time employees can participate in Sierra's equity plans subject to the terms of the applicable plans and policies.
About Sierra Club
The Sierra Club is a nonprofit organization that promotes environmental conservation. It was founded in 1892 by John Muir and is one of the oldest and largest environmental organizations in the United States. The organization has over 3.8 million members and supporters and is dedicated to protecting the planet's natural resources and wildlife. The Sierra Club engages in a variety of activities, including lobbying for environmental legislation, organizing outdoor activities, and publishing a magazine. The organization is headquartered in Oakland, California.
