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Semi-Senior Full-Stack Software Engineer

Flix
Rio de Janeiro, BrazilPosted Jul 25, 2026
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Semi-Senior Full-Stack Software Engineer

Félix Rio de Janeiro e Região

Semi-Senior Full-Stack Software Engineer

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Salvar 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 powered by 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 B company, backed by over $100 million in funding from top-tier global investors, including QED, Castle Island, Switch Ventures, HTwenty, Monashees, and 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 shit 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’re looking for a Semi-Senior Full-Stack Software Engineer to join our fintech engineering team. In this role, you’ll take ownership of key projects, contribute to the design and development of scalable systems, and help shape the architecture of our core financial infrastructure.

This is a great opportunity for an engineer who’s moved beyond the junior stage and is ready to take on more technical responsibility while continuing to learn and grow.

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

  • Design, build, and maintain frontend and backend services
  • Contribute to architecture decisions and help scale payment and financial systems
  • Write clean, testable, and maintainable code with a focus on performance and reliability
  • Troubleshoot and resolve production issues with a mindset for long-term improvement
  • Collaborate with product managers, designers, and other engineers to define and deliver solutions
  • Use GCP services (e.g., Pub/Sub, Cloud Functions, Firestore, BigQuery) to build cloud-native solutions
  • Participate in improving CI/CD pipelines, observability, and dev tooling

Requirements

  • 2–5 years of professional software engineering experience
  • Ability to contribute across the full stack, including backend development with Python and frontend development with React, JavaScript, and CSS
  • Experience working with RESTful APIs, databases (SQL/NoSQL), and cloud platforms (GCP preferred)
  • Strong communication skills and a collaborative, problem-solving mindset
  • 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.

Want to learn more about our privacy practices? Check out our Privacy Policy.

  • Nível de experiência

    Pleno-sênior

  • Tipo de emprego

    Tempo integral

  • Função

    Engenharia e Tecnologia da informação

  • Setores

    Atividades de serviços financeiros

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