Lead Software Engineer - Alti (AI)

About the role

Alternative Payments is building the financial operating system for SMBs, starting with accounts receivable and now expanding into accounts payable, AI-powered analytics and beyond. It is hiring a Lead Software Engineer for Alti, its AI agent product that launched in July 2026 and has moved past MVP. The goal is to scale Alti into a core product with more agents, automated routines and proprietary machine learning models alongside LLMs. This is a remote position based in Brazil and a technical leadership role, not a people management role.

Key responsibilities

• Own the technical direction of Alti features, from conversational AI to agents and automated routines.
• Define standards for LLM evaluation, prompt management, monitoring and observability.
• Lead the design of RAG pipelines and agent architectures and make the trade-off calls.
• Drive the move from LLM-only features to proprietary ML models, including taking them to production with monitoring and continuous feedback.
• Identify new ML use cases across the AP platform (e.g., invoice payment prediction) and shape them with Product.
• Act as a reference for AI in the product org: review designs, pair with engineers and share practices.
• Keep shipping hands-on, writing code every week.

Required profile

• Strong experience as a software engineer with a track record of owning technical decisions on product features end to end.
• Hands-on work on AI products in the last 12 months (LLMs, agents, AI features), with ownership of meaningful parts of the system.
• Autonomy to define a process in a new area, not just execute one.
• A product mindset focused on what gets delivered to users, not only the model.
• Comfort in a fast-paced environment where you own many parts of the delivery chain.
• Professional working proficiency in English.

Required skills

• Experience with chatbots/conversational AI, RAG and LLM evaluation pipelines.
• Strong skills in at least one of Go, TypeScript/JavaScript or Python.
• Nice to have: experience putting ML models into production with monitoring, AI monitoring and observability tooling, prompt engineering, autonomous agents across channels (Slack, Teams, WhatsApp), and a background in fintech, payments or financial products.

What we offer

• Total compensation of $100,000 - $120,000 plus equity, tailored to experience, skills and expertise.
• Equity opportunities.
• Unlimited PTO and flexibility.
• Yearly learning and development stipend.