Senior FullStack Engineer (Consumer Lending) (Guadalajara)

Félix; Región Centro; Remote; MXN 2,229,000 - 3,343,000; Full time

Benefits offered by this job

Stock options

Annual performance bonus

Health, dental, and vision plans

Unlimited PTO

Paid parental leave

Job summary

Félix is building the financial ecosystem for Latin immigrants in the U.S. Our team shapes the core architecture of the Fintech Platform in the Consumer Lending area, building, optimizing, and scaling backend microservices that power secure payments, compliance, and disbursement workflows.

You will work with a tech stack that includes Python, Flask/FastAPI, REST APIs, Kubernetes, and Google Cloud, delivering high-performance systems while collaborating with product, operations, and security

Qualifications

• 7+ years of experience as a Software Engineer in a fast-paced environment.
• Fluent or advanced English.
• Proven track record of building, shipping, and iterating on software applications, particularly in Fintech.
• Solid foundation in algorithms and data structures.
• Experience designing and implementing web services, including REST APIs.
• Familiarity with Hexagonal/Event-Driven architectures and feature flag patterns.
• Desirable: experience in payments, disbursement, or compliance platforms.

Responsibilities

• Architect and implement scalable backend microservices for the Consumer Lending team.
• Design and manage infrastructure capable of handling millions of daily requests with top security and performance.
• Utilize Google Cloud services to build distributed systems.
• Collaborate with product, operations, compliance, and other units to deliver holistic financial solutions.
• Mentor junior developers and promote engineering best practices.
• Leverage analytics to refine platform capabilities.

Skills

Backend architecture

Security best practices

Cloud computing

Team mentoring

English proficiency

Tools

React

Python

Flask/FastAPI

REST APIs

Redis

SQL

gRPC

Google Cloud

Firestore

BigQuery

Kubernetes

Terraform

NewRelic

PagerDuty

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 “Endeavor 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—serving a community that has been underserved for too long. We are a team that is fiercely loyal to each other, where radical transparency and constructive feedback are how we grow and push for excellence. We are bold, we care less about what others are doing, and more about creating sustainable value and a product that truly makes our users' lives better. We are building the future, today.

About The Role

In this role, you will be instrumental in shaping the core architecture of our Fintech Platform. You will work in our Consumer Lending team to build, optimize, and scale the backend microservices that drive our financial operations. This is a unique opportunity for a talented engineer who is passionate about secure, high-performance financial systems and has experience in building solutions that handle complex payment, compliance, and disbursement workflows.

Technology Stack:

• We are technology agnostic and value candidates with diverse backgrounds. While familiarity with the following is helpful, your willingness to learn and adapt is paramount:


• Front-end: React, HTTP, HTML/DOM, JavaScript, CSS, AJAX


• 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

• Platform Architecture & Development: Architect and implement scalable backend microservices inside the Consumer Lending Team.


• Infrastructure & Scalability: Design and manage infrastructure capable of handling millions of daily requests while maintaining the highest standards of security and performance.


• Cloud Integration: Utilize Google Cloud services and industry-standard tools to build and maintain distributed systems.


• Cross-functional Collaboration: Work closely with product, operations, compliance, and other business units to deliver holistic financial solutions.


• Mentorship & Growth: Mentor junior developers and promote best practices across the engineering team.


• Continuous Improvement: Leverage user feedback and system analytics to refine and iterate on platform capabilities.

Requirements

• 7+ years of experience as a Software Engineer in a fast-paced, dynamic environment.


• Fluent or advanced English.


• Proven track record of building, shipping, and iterating on software applications, particularly in the Fintech domain.


• Solid foundation in algorithms and data structures.


• Experience designing and implementing web services, including REST APIs.


• Familiarity with architectural patterns such as Hexagonal Architecture, Event-Driven Architecture, and practices like A/B Testing, Feature Flags, and Gradual Rollouts.


• Domain Expertise: Experience in building and maintaining payment systems, financial disbursement solutions, or compliance-driven platforms is highly desirable.


• Knowledge of security protocols, compliance standards, and KYC/AML processes.


• A passion for developing products that make a real impact on millions.


• Commitment to continuous learning and staying abreast of emerging technologies.


• Excellent collaboration and prioritization skills in a team-oriented environment.


• Curiosity and/or experience in Fintech is a plus (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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