Senior Software Engineer, Backend

Flex · Remote / BrazilRemotesenior

In short

▸Ingeniero backend senior en un banco privado inteligente impulsado por IA para dueños de empresas.
▸Diseñas y construyes sistemas críticos que gestionan dinero a escala, desde la arquitectura hasta el despliegue.
▸Oportunidad única de impacto temprano en una empresa de hasta $100B con enfoque en innovación financiera profunda.

No se requiere inglés, pero se trabaja en un entorno multilingüe con ingeniería global.

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What they ask for

✓Experiencia demostrable como ingeniero backend en empresas de alto crecimiento.
✓Capacidad para llevar proyectos desde la idea hasta el lanzamiento con propiedad y autonomía.
✓Conocimiento sólido en arquitectura de sistemas para aplicaciones de alto rendimiento y seguridad.
✓Experiencia trabajando con tecnologías en la nube (AWS, GCP o Azure).
✓Habilidades para colaborar en equipos pequeños y ágiles con responsabilidad directa sobre el impacto.
✓Actitud orientada a resultados, con baja jerarquía y alta propensión a la acción.

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Node.jsPythonPostgreSQLRedisAWSDockerKubernetesgRPCCI/CDGraphQL

Who should you write to at Flex?

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Flex is building the AI-native private bank for business owners. We’re re-architecting the entire financial system for entrepreneurs—from the first dollar a business earns to how that value compounds, moves, and is ultimately spent in real life. Banking, credit, payments, personal finance, and financial operations—rebuilt from the ground up as a single, intelligent system. Flex is the full financial home for ambitious owners. Since launching publicly in September 2023, Flex has scaled from zero to nine-figure annualized revenue, with a clear path to profitability by late 2026. We move fast, ship relentlessly, and operate with extreme ownership. Our customers are affluent business owners ($3–$200M in revenue)—the backbone of the economy and one of the most underserved segments in finance. They’re stuck with outdated banks and fragmented tools. We’re replacing all of it. The opportunity is massive: a ~$1T+ revenue market hiding in plain sight. Our ambition is to build a $100B+ company by delivering a product that is fundamentally better—not incrementally improved. Flex has raised $100M+ in equity and $300M+ in debt. - Mission-critical problems: We build software that directly controls how money moves at scale. - High bar, low ego: Small teams, exceptional people, real ownership. - Speed over comfort: We prioritize execution, quality, clarity, and results. - Enduring impact: What we’re building will define how a generation of owners runs their businesses. Team & Locations We hire exceptional people who want to build hard things and see their work matter immediately. Roles are available in: San Francisco, Miami, New York, and fully remote. Flex Fuels Ambition. The Role We are looking for engineers who are excited to be part of our early story and help us build a diverse and vibrant company. As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end. You will have the opportunity to learn and drive the creation of financial products and experiences to help our customers reach their full potential. You should have a strong sense of ownership and enjoy taking projects from inception to release. As an early employee, you’ll be working with a nimble team of committed and talented engineers and having a large, long-term impact on technical design and engineering culture. We are open to candidates from Canada, the United States, and Colombia.

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