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Retorna

Senior Backend Developer – AI First, Fintech, Ops, B2B

Retorna

Sr. Backend Developer working on AI-first fintech solutions for cross-border payments in a fully remote environment.

Posted 7/6/2026full-timeRemote • 🇪🇸 SpainSenior💰 €4,000 per monthWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in backend development with a focus on Node.js and TypeScript, ensuring high-availability systems and compliance in financial transactions. Proficient in AWS services and integrating AI technologies to enhance operational capabilities.

Highest-signal resume keywords
Node.js DevelopmentTypeScript ProficiencyAWS Services (Lambda, SQS, SNS, Fargate)AI Integration in ProductionFinancial Systems Design

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Node.jsTypeScriptBackend DevelopmentAI TechnologiesSystem Design
Tools & Technologies
AWS LambdaAWS SQSAWS SNSAWS Fargate
Industry Keywords
ComplianceTransborder PaymentsAPI IntegrationHigh-Criticality Systems

Tech Stack

Tools & technologies
AWSJavaScriptNode.jsTypeScript

About the role

Key responsibilities & impact
  • Sr. Backend Developer — Ops: el equipo que garantiza que cada transacción se ejecute con precisión, trazabilidad y compliance en todos los corredores donde operamos
  • Sr. Backend Developer — B2B: el equipo que construye las integraciones y capacidades que permiten a empresas procesar pagos transfronterizos a través de nuestra API

Requirements

What you’ll need
  • Node.js + TypeScript sólido en backend de alta criticidad
  • AWS en producción (Lambda, SQS, SNS, Fargate — lo que aplique)
  • IA en producción real: agentes autónomos, pipelines RAG, integración de LLMs con guardrails
  • Experiencia diseñando sistemas donde un error tiene consecuencias financieras
  • 5+ años de experiencia backend con código real bajo la capó

Benefits

Comp & perks
  • 100% remoto — desde cualquier país de LATAM o España
  • Problemas técnicos de verdad: arquitectura distribuida, alta volumetría, multi-jurisdiccional
  • Equipo técnico sólido con quien construir, no solo ejecutar