Senior Full Stack Engineer — AI Fintech (Remote)

Félix; Buenos Aires; Remote; ARS 61,816,000 - 108,178,000; Full time

Benefits offered by this job

Competitive salary

Stock options grant

Annual performance bonus

Health, dental, and vision plans

Remote work currently; moving tohybrid

Unlimited PTO

Paid parental leave

Continuous learning opportunities

Growth in entrepreneurial environment

Job summary

Félix is building a conversational financial platform serving Latinos in the US, with AI-driven remittances, crypto rails, and plans for credit, savings, and wallet services. You will shape core technology powering chat-driven experiences across WhatsApp, Web, and mobile apps, building frontend and backend components with a focus on performance and scale.

You will design and improve interactive chat services, leverage Google Cloud, Kubernetes, and modern tooling to support millions of daily

Qualifications

• 5+ years of experience as a Software Engineer in a fast-paced environment.
• Proven ability to build, ship, and iterate on software applications with real-world impact.
• Strong foundation in algorithms and data structures.
• Experience with web services, including SOAP and REST APIs.
• Familiarity with architectural patterns like Hexagonal Architecture, Event Driven Architecture, A/B Testing, Feature Flags, and Gradual Rollouts.
• Familiarity with AI tools such as Claude, Cursor, Codex or similar technologies.
• Fluent or Advanced English.

Responsibilities

• Architect and implement high-performance, scalable backend microservices.
• Build, deploy, and iterate on UI services and conversational interfaces.
• Design and manage infrastructure for millions of daily requests with real-time messaging.
• Develop backend services using Google Cloud and established standards.
• Mentor junior developers and collaborate with product, UX/UI, and business units.
• Iterate on conversational experiences using customer feedback and analytics.

Skills

Software engineering

Algorithms & data structures

English proficiency

Collaborative work style

Continuous learning

Tools

Python

Flask/FastAPI

REST APIs

Redis

SQL

gRPC

React

JavaScript

HTML/CSS

React Native

Kubernetes

Terraform

NewRelic

PagerDuty

Google Cloud

Job description

Félix is building a conversational financial platform serving Latinos in the US, with AI-driven remittances, crypto rails, and plans for credit, savings, and wallet services. You will shape core technology powering chat-driven experiences across WhatsApp, Web, and mobile apps, building frontend and backend components with a focus on performance and scale.

You will design and improve interactive chat services, leverage Google Cloud, Kubernetes, and modern tooling to support millions of daily