Senior Software Engineer (Backend oriented) (Rio de Janeiro)

Félix; Rio de Janeiro; Remote; BRL 662,000 - 992,000; Full time

Benefits offered by this job

Competitive salary

Initial stock options grant

Annual performance bonus

Health, dental, and vision plans

Work model: fully remote now, futurehy

Continuous learning opportunities

Unlimited PTO

Paid parental leave

Growth opportunities in a dynamic env

Job summary

Félix is seeking a Senior Software Engineer to join our Product Engineering Team and shape the core technology behind our chat-driven platform. You will design scalable backend services and empower conversational experiences across WhatsApp and other channels.

You will work on high-traffic systems, collaborate with product, UX/UI, and business units, and mentor junior developers while delivering impact in a fast-growing fintech environment.

Qualifications

• 5+ years of software engineering in a fast-paced environment.
• Experience building chatbots, conversational interfaces, or NLP tools.
• Strong foundation in algorithms and data structures.
• Experience with web services, including SOAP and REST APIs.
• Familiarity with Hexagonal Architecture, Event Driven Architecture, A/B Testing, Feature Flags, and Gradual Rollouts.
• Fintech experience is a plus.

Responsibilities

• Design & Architecture: Architect and implement high-performance, scalable backend microservices for the Chat Platform.
• Conversational Interfaces: Build and iterate on chatbot services for user interactions with remittance services.
• Infrastructure: Design and manage infrastructure handling millions of daily requests with real-time messaging.
• Cloud Integration: Develop backend services using Google Cloud services and established industry standards.
• Collaboration & Mentorship: Mentor junior developers and collaborate with product, UX/UI, and business units.
• Continuous Improvement: Use customer feedback and analytics to improve conversational experiences.
• Proficiency in English at an Upper-Intermediate level or higher is required.

Skills

Python

Flask/FastAPI

REST APIs

gRPC

Redis

Kubernetes

Terraform

Google Cloud

NLP/Chatbot

English fluency

Tools

Docker

NewRelic

PagerDuty

Job description

About Us

At Félix, 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

As a key member of our engineering team, you will have a unique opportunity to shape the core technology behind our chat-driven platform. You will work on Félix's Product Engineering Team — a sophisticated system that not only processes high volumes of transactions but also delivers conversational experiences through integrated chatbots and natural language interfaces. Your role will be crucial in designing and enhancing interactive chat services that enable seamless, intuitive user interactions on platforms like WhatsApp. If you have experience building chatbots or crafting conversational experiences, this is your chance to make a significant impact.

Technology Stack:

• Back-end: Python, Flask/FastAPI, REST APIs, Redis, SQL, gRPC


• Cloud: Google Cloud services (Firestore, Cloud Storage, Pub/Sub, Google Artifact Registry, Cloud Run, BigQuery, Cloud Composer, etc.)


• Infrastructure: Kubernetes, Terraform, NewRelic, PagerDuty

Responsibilities

• Design & Architecture: Architect and implement high-performance, scalable backend microservices, including core components of our Chat Platform.


• Conversational Interfaces: Build, deploy, and iterate on chatbot services and conversational interfaces that empower users to interact naturally with our remittance services.


• Infrastructure: Design and manage infrastructure capable of handling millions of daily requests with real-time messaging capabilities.


• Cloud Integration: Develop backend services using established industry standards and Google Cloud services.


• Collaboration & Mentorship: Foster the growth of junior developers through mentorship and best practice implementation, while collaborating closely with cross-functional teams including product, UX/UI, and business units.


• Continuous Improvement: Leverage customer feedback and analytics to iterate and improve our conversational experience, ensuring that our chatbots remain effective and user-friendly.


• Proficiency in English at an Upper-Intermediate level or higher is required.

Requirements

• 5+ years of experience as a Software Engineer in a fast-paced environment.


• Proven ability to build, ship, and iterate on software applications with an emphasis on 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.


• Conversational Experience: Demonstrated experience in building chatbots, conversational interfaces, or integrating natural language processing (NLP) tools. Familiarity with chatbot frameworks (e.g., DialogFlow, IBM Watson, Rasa) is a plus.


• Passion for building products that positively impact millions.


• Commitment to continuous learning and exploration of new technologies.


• Ability to thrive in a collaborative environment and contribute actively with innovative ideas.


• Excellent prioritization skills.


• Curiosity and/or experience in Fintech is an added advantage (though equivalent competencies will also be considered).

These are the applicable requisites, although equivalent competencies in any of the above will also be considered.

What We Offer

• Competitive salary


• Initial stock options grant


• Annual performance bonus


• Health, dental, and vision plans


• Work model: Currently fully remote, with a future transition to a hybrid setup.


• Continuous learning opportunities


• Unlimited PTO


• Paid parental leave


• Empowering opportunities for growth in a dynamic entrepreneurial environment

Equal Opportunity Employer

At Félix, we are committed to providing equal employment opportunities to all qualified employees and applicants without regard to race, religion, nationality, sex, sexual orientation, gender identity, age, or disability. This policy applies to all terms and conditions of employment, including recruitment, hiring, placement, promotion, training, compensation, benefits, and termination.

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