Senior Full Stack Engineer (CX Platform) (Paraná, Argentina)
Senior full-stack engineer on Félix's CX Platform team building in-house operational modules end-to-end for a Series C fintech (US remittances for Latinos): React + TypeScript UIs down through Node.js/TypeScript REST services and PostgreSQL data modeling, with RBAC and BFF/aggregation layers. Currently fully remote in Argentina.
- Compensation
- Not disclosed
- Location
- Parana, ARG
- Work setup
- Hybrid
- Seniority
- Senior
- Employment
- Not specified
- Experience
- 5+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 5+ years of experience as a Software Engineer in a fast-paced, dynamic environment
- Fluent or advanced English
- Advanced React and UI engineering with solid web standards (HTML/DOM, CSS, HTTP)
- TypeScript proficiency
- Solid Node.js backend skills and well-structured REST API design
- Relational data modeling: schema design, performant queries, transactional integrity
- Hands-on authentication/authorization experience, especially RBAC over sensitive data
- Ability to design BFF/aggregation layers consuming multiple microservices
- Excellent problem-solving skills balancing creative UI and backend rigor
Nice to have
- Technical leadership: mentoring engineers, strong code reviews, architectural influence
- Experience building internal tools, CRM systems, or high-density data applications
- Background in regulated sectors (Fintech, Healthcare) with RBAC and data isolation
Full description
About Us
AtFélix, we are building the indispensable financial companion for Latinos in the US. We combine an AI-powered, conversational-first interface with real-time financial infrastructure to make cross-border money movement as easy as sending a text. Starting with fast, affordable remittances powered by AI and crypto rails, we are expanding into credit, savings, and wallet services to support the complete immigrant financial journey. Our ambition is to deliver a white-glove financial experience with the simplicity of a conversation to a community the traditional financial system has historically overlooked.
We are a hyper-growth Series C company, backed by over $300 million in funding from top-tier global investors, including Andreessen Horowitz, QED, Castle Island, Switch Ventures, HTwenty, Monashees, 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.
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—serving a community that has been underserved for too long because we are obsessed with our customers. We get things done with urgency and focus, driven by extreme ownership over our impact. We collaborate without ego, fostering radical transparency and fierce loyalty so we can grow together. Because we aim for insanely great rather than just good enough, we stay insatiably curious—always experimenting, building the future today, and delivering a product that truly makes our users' lives better.
About the Role
We are transitioning our core operational capabilities from third-party low-code solutions to a robust, highly scalable, in-house ecosystem. As part of the CX Platform team, you will own the construction of the operational modules that power our daily business, building features end-to-end from the React UI down to the Node.js services that aggregate and protect our data.
You will own the modules, screens, and APIs that the CX team relies on every day, designing, building, and shipping them end-to-end. Your work has a direct, measurable impact: every feature you ship reduces handling times, removes friction, and gives our operators superpowers.
If you love taking features from idea to production without artificial silos between frontend and backend, and you get satisfaction from shipping tools that real humans rely on to do real work, this is your place.
Technology Stack:
We care more about strong engineering fundamentals than expertise in any specific tool. If your foundations are solid, picking up adjacent technologies should be second nature. That said, here is the stack you will be working with day to day: