Lead Software Engineer

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 Lead Software Engineer to help set the technical direction of Alti, our AI agent product. Alti launched in July 2026 and has moved past MVP. The next step is scaling it into a core product of our platform: more agents, more automated routines, and our 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 we evaluate and monitor AI features, and become a reference for AI across our product teams. This is a technical leadership role, not a people management role.

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

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  Define the standards for LLM evaluation, prompt management, monitoring and observability.

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  Lead the design of RAG pipelines and agent architectures, and make the trade-off calls.

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  Drive the move from LLM-only features to proprietary ML models, including taking them to production with monitoring and continuous feedback.

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  Identify new ML use cases across the AP platform (e.g., invoice payment prediction) and shape them with Product.

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  Act as a reference for AI inside the product org: review designs, pair with engineers and share practices.

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

• 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.

• 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.

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.