--- title: 'Senior Full Stack Engineer at Felix Technologies, Inc.' canonical: 'https://feeny.ai/job/senior-full-stack-engineer-felix-technologies-inc-buenos-aires-9yn0n8a97jes' type: 'job' last_seen: '2026-09-05' --- # Senior Full Stack Engineer at Felix Technologies, Inc. - **Company:** Felix Technologies, Inc. - **Location:** Buenos Aires, Argentina - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-09-02 - **Last confirmed live:** 2026-09-05 - **Apply:** https://jobs.gem.com/felix/am9icG9zdDqOBOezRFnRBSoBrVi7FsNT ## Job description ## About Us At [Félix](https://felixpago.com/), 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—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 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: - Front-end: Advanced React, TypeScript, Component-Driven UI, Modular CSS Architectures. - Back-end: Node.js + TypeScript, REST API design, secure aggregation layers, Backend-for-Frontend (BFF) patterns. - Data Layer: Relational data modeling (PostgreSQL or similar), schema design, query optimization, transactional integrity. - Security & Access: RBAC, secure handling of sensitive data, strict environment isolation. - Tooling & Delivery: Modern build tools and bundlers, Git workflows, CI/CD pipelines. ## Responsibilities - End-to-End Feature Ownership: Build complete operational modules, from the React UI down to the Node.js services and data models that power them. You own the feature, not just a layer of it. - Module Development: Design and ship the modules that live on top of our CX platform: high-density data views, complex operational workflows, and internal tools that drastically reduce cognitive load for our operators. - Secure Integration Layer: Implement intermediary layers (BFFs, aggregators) that consume internal microservices and external providers, standardize payloads, and enforce strict authorization rules before data reaches the client. - Operational Efficiency: Collaborate shoulder-to-shoulder with core business stakeholders to deeply understand their daily workflows, then translate that understanding into technical solutions that materially reduce handling times. - Engineering Craft: Champion clean patterns, pragmatic design, and a high quality bar across the modules you ship. Mentor peers and elevate the broader engineering culture. ## Requirements - 5+ years of experience as a Software Engineer in a fast-paced, dynamic environment. - Fluent or advanced English. - Advanced React & UI Engineering: Deep understanding of React and solid foundations in web standards (HTML/DOM, CSS, HTTP). TypeScript proficiency is expected. - Solid Node.js / Backend Skills: Proven ability to design and build well-structured REST APIs in Node.js. Strong grasp of API design, service boundaries, error handling, and clean backend patterns. - Data Modeling: Comfortable designing relational schemas, writing performant queries, and reasoning about transactional integrity. - Security & Authorization: Hands-on experience implementing authentication and authorization flows, especially Role-Based Access Control (RBAC) over sensitive data. - Aggregation / BFF Patterns: Ability to design backend-for-frontend or aggregation layers that consume multiple microservices and expose a clean, secure surface to the client. - Problem Solving: Excellent problem-solving skills with a balance of creative UI implementation and strict engineering rigor on the backend. Nice to have (highly desirable): - Technical Leadership: Track record of mentoring engineers, raising the bar in code reviews, and influencing architectural decisions beyond your immediate scope. - Internal Tools / Enterprise Ops: Experience building internal tools, CRM systems, or high-density data applications focused on operational efficiency and scale. - Regulated Environments: Background in highly regulated sectors (Fintech, Healthcare) dealing with strict role-based access control (RBAC) and data isolation. ## 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 - 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. Want to learn more about our privacy practices? Check out our [Privacy Policy](https://www.felixpago.com/en/legal). ## About Felix Technologies, Inc. ## Company Overview - **One-liner**: Félix is an AI-powered financial services platform that enables Latino immigrants in the U.S. to send money to Latin America via WhatsApp and is expanding into broader cross-border financial products. - **Entity Type**: Private (Series B) - **Headquarters**: San Francisco, California, United States (also operates with a remote HQ model) - **Founded**: 2021 - **Founders**: Manuel J Godoy (Co-Founder & CEO), Bernardo Garcia (Co-Founder) ## Core Business - **Primary Industry**: Financial Services – Remittances and cross-border payments. - **Target Customers**: B2C – Latino immigrants in the United States sending money to family in Latin America (Mexico, Guatemala, Honduras, El Salvador, Colombia, Ecuador, Peru, and more). - **Mission / Purpose**: To build the financial companion for Latino immigrants in the United States, starting with remittances and expanding into the broader financial life that follows. ## Products & Services - **Félix WhatsApp Chatbot**: Core product – an AI-powered chatbot integrated into WhatsApp that allows users to send money to Latin America in three steps. No app download required. Supports payments via credit/debit card or cash, with recipients receiving funds in bank accounts or via store pickup. - **Broader Financial Services (in development)**: Félix is expanding beyond remittances into additional financial services for Latino immigrants, including managing money across borders with trust, speed, and simplicity. ## Market Standing - **Valuation**: Not publicly disclosed. - **Key Metric**: Total Funding – $99.5M (as of May 2025) across six rounds (Pre-Seed, Seed, Series A, Series B). Annual Revenue reported at $1.5M. - **Notable Investors/Partners**: QED Investors (led Series B), Castle Island Ventures (led Series A), Switch Ventures (led Pre-Seed), HTwenty, Monashees, General Catalyst Customer Value Fund. - **Growth Signals**: - Processed over $6B in transactions since inception. - Headcount grew ~99.2% year-over-year to 261 employees (across 15 countries). - Expanded services to Guatemala and Honduras after initial focus on Mexico. - 93 active job postings (as of late 2025/early 2026), with yearly job posting growth of +389.5%. ## Competitive Advantages - **Deeply integrated with WhatsApp**: Users can send money without leaving a chat app they already use, lowering barriers to adoption. - **Latino-built, culturally tailored**: Team understands the financial, cultural, and emotional reality of sending money home; support in Spanish, 24/7. - **Technology stack**: Combines AI, blockchain, and stablecoins to make cross-border payments faster, more affordable, and more accessible. - **Top-tier investor backing**: Over $100M from respected global fintech and crypto investors, validating the model. ## Strategic Focus - **Expansion into full financial services**: Moving beyond remittances to become the financial companion for Latino immigrants (e.g., savings, lending, credit). - **Geographic growth**: Adding new sending corridors (e.g., El Salvador, Colombia, Ecuador, Peru) and recipient countries. - **Product development**: Leveraging AI and chat-based interfaces to simplify more financial tasks. ## Why Work Here - **Culture**: Described as a hyper-growth Series B company with a “legendary” mission – a group of high-performers united by an obsession with customer empowerment. Values include inclusion, speed, and impact. - **Remote/hybrid policy**: Remote-first HQ in San Francisco, with offices in SF and distributed across 15 countries (including Mexico, Argentina, Brazil, Colombia, etc.). Offers flexibility. - **Engineering & growth**: Strong emphasis on tech (101 employees in technical roles). Active hiring for senior software engineers, data analysts, credit risk analysts, fraud specialists, and product managers. - **Notable perks**: Backed by top investors; opportunity to work on cutting-edge AI, blockchain, and stablecoin technology for a mission-driven product that serves an underserved market. ## Sources 1. [jobs.gem.com](https://jobs.gem.com/felix) – Career page and company data 2. [linkedin.com](https://linkedin.com/company/felix-pago) – Company details, workforce, and financials 3. [felixpago.com](https://www.felixpago.com/en/what-is-felix) – Product description and service regions 4. [felixpago.com](https://www.felixpago.com/en/life-at-felix) – Culture, milestones, and mission ## Other roles at Felix Technologies, Inc. - [Senior Regional Office Manager](https://feeny.ai/job/senior-regional-office-manager-felix-technologies-inc-mexico-city-ksf8zxhxxsqx) — Mexico City, Mexico - [Senior Product Manager - Multiproduct Enablement (Copy)](https://feeny.ai/job/senior-product-manager-multiproduct-enablement-copy-felix-technologies-inc-san-8x2s1zwmcb87) — San Francisco, CA - [Senior Product Manager - Multiproduct Experience Enablement](https://feeny.ai/job/senior-product-manager-multiproduct-experience-enablement-felix-technologies-dky8xqwv9gm8) — New York, NY - [Senior Product Manager - Multiproduct Enablement](https://feeny.ai/job/senior-product-manager-multiproduct-enablement-felix-technologies-inc-mexico-43nx4p88snnh) — Mexico City, Mexico - [Senior Product Manager - Multisurface](https://feeny.ai/job/senior-product-manager-multisurface-felix-technologies-inc-san-francisco-pfpbnyye0ams) — San Francisco, CA - [Senior Product Manager - Multisurface](https://feeny.ai/job/senior-product-manager-multisurface-felix-technologies-inc-new-york-w86fpz7gmmjn) — New York, NY - [Senior Product Manager - Multisurface](https://feeny.ai/job/senior-product-manager-multisurface-felix-technologies-inc-mexico-city-h8n5emzhy974) — Mexico City, Mexico - [Semi-Senior Software Engineer (Product Engineering Team)](https://feeny.ai/job/semi-senior-software-engineer-product-engineering-team-felix-technologies-inc-g15mrp09bpg5) — Buenos Aires, Argentina - [Full Stack Software Engineer (Product Engineering Team)](https://feeny.ai/job/full-stack-software-engineer-product-engineering-team-felix-technologies-inc-mcbv311qzb66) — Buenos Aires, Argentina - [Senior Software Engineer (Product Engineering Team)](https://feeny.ai/job/senior-software-engineer-product-engineering-team-felix-technologies-inc-buenos-pavgt1zcm2az) — Buenos Aires, Argentina