Lead Software Engineer (AI Agent Product) - Remote (Brazil)

About Alternative Payments

Alternative Payments is building the financial operating system for SMBs, consolidating the disconnected tech stack that holds service-based businesses back. Starting with MSPs, they’ve spent five years perfecting accounts receivable, and are now expanding into accounts payable, AI-powered analytics, and beyond. They’re at an inflection point: closing the loop on money movement and laying the foundation for a platform that will reshape how service businesses operate financially.

They’re growing fast, thinking big, and building a global team that wants to be part of something that lasts. They believe the best solutions come from diverse perspectives, deep collaboration, and a shared obsession with customer impact.

What We’re Looking For

We’re looking for a Lead Software Engineer to help set the technical direction of Alti, their AI agent product. Alti launched in July 2026 and has moved past MVP. The next step is scaling it into a core product of their platform: more agents, more automated routines, and their own machine learning models alongside LLMs.

You’re a product engineer who has built AI features in production and can raise the bar for the whole squad. You’ll own technical decisions across Alti, define how they evaluate and monitor AI features, and become a reference for AI across their product teams. This is a technical leadership role, not a people management role.

This is a remote position based in Brazil.

What You’ll Do

• Own the technical direction of Alti features, from conversational AI to agents and automated routines.

• Define the 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 inside the product org: review designs, pair with engineers, and share practices.

• Keep shipping hands-on: this role writes code every week.

What You’ll Bring

• 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.

• Experience with chatbots/conversational AI, RAG, and LLM evaluation pipelines.

• Strong skills in at least one of Go, TypeScript/JavaScript, or Python.

• Autonomy to define a process in a new area, not only execute one.

• A product mindset: you care about 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.

Nice to Haves

• Experience putting ML models into production with monitoring and feedback loops.

• AI monitoring and observability tooling.

• Prompt engineering experience.

• Autonomous or personal agents working across channels (Slack, Teams, WhatsApp).

• Background in fintech, payments, or financial products.

• Experience at both an early-stage startup (Seed to Series B) and a larger tech company.

What We Offer

• Competitive salary tailored to your experience, skills, and expertise.

• The total compensation range for this role is $100,000 - $120,000, plus equity.

• Equity opportunities so you can share in their growth and success.

• Unlimited PTO and flexibility when you need it the most.

• Yearly learning & development stipend to help you grow and do your best work.

Why Choose Alternative Payments?

At Alternative Payments, you’ll do work that truly matters.

• Own your impact: Lead meaningful, high-impact projects and collaborative initiatives that are shaping the future of FinTech and redefining how businesses get paid.

• Collaborate: Work with a diverse, innovative team where every voice is heard and great ideas come from anywhere.

• Grow with them: Your career journey is top of mind. They prioritize internal growth and give you the space to shape your path based on your goals.

• Thrive in a supportive culture: As a scaling startup, there’s a lot to be done and initiative is key. They believe in shared learning, open communication, and building each other up.