Senior Software Engineer - Alti (AI)

Alternative Payments is building the financial operating system for SMBs, consolidating the disconnected tech stack that holds service-based businesses back. Starting with MSPs, we’ve spent five years perfecting accounts receivable, and we’re now expanding into accounts payable, AI-powered analytics, and beyond. We’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.

We’re growing fast, thinking big, and building a global team that wants to be part of something that lasts. We believe the best solutions come from diverse perspectives, deep collaboration, and a shared obsession with customer impact. If you’re energized by real problems, real customers, and real impact, we want to hear from you!

We’re looking for a Senior Software Engineer to join Alti, our AI agent product. Alti launched in July 2026 and is growing fast. Now we need to scale it: more agents, more automated routines, and our own machine learning models alongside LLMs.

You’re a product engineer first. You ship features that customers use, and you bring hands-on experience with LLMs, agents and data. You’ll work in a small squad with engineers, a PM and a Product Designer, and you’ll help the team get stronger at evaluation, observability and taking ML to production.

This is a remote position based in Brazil.

• Build and ship Alti product features end to end, from conversational AI to agents and automated routines.

• Design and improve RAG pipelines and prompt strategies.

• Build LLM evaluation pipelines to measure quality and catch regressions.

• Set up monitoring and observability for AI features: prompts, models and usage.

• Help take ML models to production with monitoring and continuous feedback loops.

• Partner with Product and Design to find where AI and ML can solve real customer problems.

• Solid experience as a software engineer building and shipping product features.

• Hands-on work on AI products in the last 12 months (LLMs, agents, AI features). You don’t need to have led it, but you’ve built it.

• Experience with at least one of: chatbots/conversational AI, RAG, or LLM evaluation pipelines.

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

• 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.

• Prompt engineering experience.

• AI monitoring and observability tooling.

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

• Experience putting ML models into production (e.g., predictive models) with monitoring and feedback loops.

• Background in fintech, payments or financial products.

• Has built and scaled ML/LLM products

• Experience at an early-stage startup (Seed to Series B).

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

• The total compensation range for this role is $90,000 - $105,000, plus equity. The range displayed on each job posting reflects the approximate total target compensation for the position. Within the range, individual pay is determined by factors including relevant skills, experience, education/training.

• Equity opportunities so you can share in our 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.

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 us: Your career journey is top of mind. We prioritize internal growth and give you the space to shape your path based on your goals — whether that’s deepening your expertise in your domain or exploring something new.

• Thrive in a supportive culture: As a scaling start-up, there’s a lot to be done and initiative is key. We believe in shared learning, open communication, and building each other up. When one of us grows, we all do.

Want to see what we're actually building?

We made a short video so you don't have to take our word for it. Get a glimpse of our product, our people, and the problems we're solving, then decide if it sounds like your kind of place.

• Transparency & Honesty: We communicate openly and truthfully with partners, investors, and each other so everyone understands where we stand and where we’re headed.

• Resourcefulness & AI: We stay scrappy, find creative solutions, and make progress even when the path isn’t obvious. We have a bias for action and seek out the information and resources necessary to make decisions and move quickly.

• Partnership: We win and lose together. We collaborate with our partners, investors, and teammates to tackle big challenges and reach shared goals.

• Revolutionary & Boldness: We challenge conventions, take calculated risks, and build better, stronger solutions that move our business and the industry forward.

• Accountability: We take ownership of our decisions and results. We follow through on our commitments knowing our work directly impacts our partners, our team and our business.

We’re looking for candidates who are ready to step in and make an impact from day one. We know that sometimes people hold back unless they meet every requirement, but if you’re excited about the role, bring relevant experience, and are ready to contribute, we want to hear from you!

All resumes are reviewed by our small but mighty talent team. While we may use AI tools to help prioritize applications, real people are behind every resume review and hiring decision. We’re also committed to an inclusive and accessible process. If you need any accommodations during your application or interview experience, please let us know — we’re happy to help.