AI Engineer (Agents)
AI summary of the role
Join the core AI team at a hyper-growth fintech to design, build, and scale autonomous AI agents that evolve a WhatsApp-based platform into a multi-agent system handling complex tasks across payments, fraud, and loans.
What you’ll do
- Architect and maintain scalable, stateful AI agents using Python and frameworks like Google ADK, LangGraph, CrewAI.
- Implement production monitoring, tracing, and observability for agentic workflows (LangSmith, Arize Phoenix, W&B).
- Integrate AI agents into core product infrastructure (Payments, Fraud) with full lifecycle ownership from containerization to CI/CD.
- Design automated evals-as-code with LLM-as-a-judge, semantic similarity, and adversarial benchmarking.
What you’ll bring
- 7+ years software engineering, with 2+ years in production-grade AI/ML applications focused on LLMs or generative AI.
- Mandatory expertise in Python and deep familiarity with at least one core LLM API/framework (OpenAI SDK, Google AI SDK, CrewAI, LangChain).
- Proven experience implementing agentic systems including RAG, vector databases, and memory/state management.
- Strong software engineering fundamentals: Git/GitHub, CI/CD, best practices.
Technologies
Python · Google ADK · LangGraph · CrewAI · LangSmith · Arize Phoenix · Weights & Biases · Docker · Kubernetes · RAG · vector databases · Pydantic
About Felix Pago
WhatsApp-native remittance and immigrant-finance platform that lets U.S. Latinos send money across Latin America using conversational AI and stablecoin-enabled backend rails.
Series B · 100–200 people
Source and classification
Internal deployment & tooling · Evidence for this classification:
Role We are seeking a proactive and highly skilled AI Engineer to join our core AI team. This role is central to Félix's next phase of growth, focusing on designing, building, and scaling autonomous AI Agents that will integrate directly into our product and internal operations. We are building a world-class AI team and believe great talent comes in various shapes. We are open to hiring at the Semi-Senior, Senior, or Staff level. We will calibrate your role, title, and compensation package based on your technical depth, architectural ownership, and the scope of impact you’ve historically delivered. You will be instrumental in evolving our WhatsApp-based AI platform beyond simple Q&A into a sophisticated, multi-agent system capable of reasoning, planning, and executing complex, multi-step tasks across our critical functions (e.g., loans, payments, fraud). You will partner closely with
More from the job description
About Us At Félix, we're building the financial ecosystem for Latin immigrants in the U.S., starting with a revolution in remittances. Our core product is an AI-powered chatbot built on WhatsApp, allowing our users to send money home as easily as sending a text message. We leverage cutting-edge technology like AI, blockchain, and stablecoins to make cross-border payments faster, more affordable, and more accessible than ever before. We are a hyper-growth Series C company, backed by over $200 million in funding from top-tier global investors, including QED, Castle Island, Switch Ventures, HTwenty, Monashees, and Andreessen Horowitz with support from General Catalyst Customer Value Fund. This isn't just about the numbers; it's a testament to the trust our investors have in our vision and our team. Additionally, Félix was selected as an “Endeavour Entrepreneur” and was a recipient of the CrossTech Fintech Startups Award. We are a group of extremely talented and dedicated high-performers, united by our shared obsession with a single goal: empowering our customers. We are all owners of Félix, driven by a bias for action and a true experimentation spirit to get things done with urgency and focus. Joining Félix means you will be part of a team building a legacy, a company that will outlive us all. This is a rare opportunity to apply your skills to a deeply meaningful mission—servin [... source excerpt omitted ...] level. We will calibrate your role, title, and compensation package based on your technical depth, architectural ownership, and the scope of impact you’ve historically delivered. You will be instrumental in evolving our WhatsApp-based AI platform beyond simple Q&A into a sophisticated, multi-agent system capable of reasoning, planning, and executing complex, multi-step tasks across our critical functions (e.g., loans, payments, fraud). You will partner closely with different engineering teams and PMs to translate our AI strategy into a tangible roadmap and bring it to life. This is a unique opportunity to apply a bias toward action and an experimentation spirit to solve deeply m [... source excerpt omitted ...] ems for Latin immigrants in the U.S. If you thrive in a rapid-iteration environment and want to build the infrastructure that powers a hyper-growth fintech, this is your mission. Responsibilities Production-Grade Agent Architecture: Architect, develop, and maintain scalable, stateful AI agents. You won't just build "demos"; you will ship hardened systems using Python and modern frameworks (Google ADK, LangGraph, CrewAI, etc.) that handle real-world edge cases. LLMOps & Observability: Establish production monitoring for agentic workflows. Implement tracing and observability (e.g., LangSmith, Arize Phoenix, or Weights & Biases) to track reasoning paths, tool-calling success rates, an
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