Senior Software Engineer, Agents

Role Description

We're building an AI assistant that helps developers understand and grow their subscription revenue. It lives in Slack today and is expanding to our dashboard and API. It can pull real-time data, evaluate experiments, debug integrations, and explain what's happening in your app using natural language. We see a future where the majority of a user's interactions are either intermediated or automated by our agent.

We're a team that's historically built deterministic CRUD systems, and we need an engineer who can build the foundational agent infrastructure that everything else runs on:

• Orchestration
• Tool execution
• Context management
• Evaluation
• The trust layer that lets us give an agent increasing autonomy over things that matter

Qualifications

• 5+ years of experience shipping production systems
• Hands-on experience building with LLMs — not just prompting, but building the systems around them: tool use, structured output, context management, evaluation, orchestration
• Strong backend fundamentals; built systems that need to be reliable, observable, and secure
• Comfortable with ambiguity; this is an early-stage product inside a growth-stage company
• Self-directed; figure out what needs to be built, build it, and ship it
• Collaborate well with others and can communicate effectively in a fully-remote culture

Requirements

• Experience with OpenAI/Anthropic APIs specifically (bonus)
• Built agents that other people use (bonus)
• Experience with evaluation and observability frameworks (Langfuse, Langchain, etc) (bonus)
• Familiarity with subscription business models, app stores, or developer tools (bonus)
• Built Slack integrations or other conversational interfaces (bonus)
• Contributions to open-source AI/ML tooling (bonus)

Benefits

• Competitive equity in a fast-growing, Series C startup backed by top-tier investors, including Y Combinator
• 10-year window to exercise vested equity options
• Fully remote and flexible work environment
• 4-5 weeks of suggested time off annually for mental, physical, and emotional recharge
• $2,000 USD for workspace setup and $1,000 USD annual stipend for continuous learning

Company Description

RevenueCat removes the headaches of building and scaling in‑app subscriptions. Since graduating from YC’s S18 batch we’ve grown into the default monetization platform for mobile:

• We’re in >40% of newly shipped subscription apps
• We process $12B+ in annual purchase volume
• We help everyone from a solo dev in Brazil to the OpenAI mobile team understand and grow their revenue

We’re a remote‑first crew of 150+, spread across 25+ countries, and guided by values we actually practice: Customer Obsession, Always Be Shipping, Own It, and Balance.