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Ualá

Fintech with free prepaid Mastercard payments

Technical Lead Backend - Cripto

Backend EngineeringConfirmed live in the last 24 hours
Full-timeArgentinaNo salary listed

About the Job

Requirements

  • More than 5 years of backend development experience, including at least 2 years leading technical teams or acting as a technical reference or Tech Lead.
  • Solid experience building and maintaining high-performance microservices with Go (Golang).
  • Prior experience or strong technical understanding of the crypto, fintech, or Web3 industry, including payment processing, custody, interaction with nodes, or blockchain protocols.
  • Advanced knowledge of Go (Golang), concurrency management, and service optimization.
  • Knowledge of applied cryptography, including asymmetric signatures, hashing, and Public Key Infrastructure (PKI), and blockchain API integration.
  • Knowledge of microservices architecture, RESTful APIs, gRPC, and event-driven messaging such as Kafka, RabbitMQ, or equivalents.
  • Knowledge of SQL and NoSQL databases, data modeling, and query optimization.
  • Experience with containers, including Docker and Kubernetes, and CI/CD workflows.

Responsibilities

  • Guide the backend team day to day by conducting code reviews, resolving technical blockers, and promoting engineering best practices.
  • Design and implement scalable Go microservices, ensuring clean code, high availability, and efficient concurrency for real-time financial operations.
  • Coordinate backend integration with exchanges, blockchain protocols, custody providers, crypto infrastructure services, and compliance services for Anti-Money Laundering (AML) and Know Your Transaction (KYT).
  • Uphold security standards for key management, encryption, and signatures, and ensure adequate unit and integration test coverage, including secure key lifecycle management for custody, rotation, and signing.
  • Work with Product Owners and Scrum Masters to estimate tasks, plan sprints, and ensure timely technical delivery.
  • Foster the technical growth of team developers through ongoing feedback and support.

About the Company

Ualá

Fintech with free prepaid Mastercard payments

Ualá provides a free prepaid Mastercard and a mobile app in Argentina to help people manage their money. The app lets users spend anywhere Mastercard is accepted, send and receive money instantly at no cost, pay bills, recharge prepaid services, and load their SUBE card. It uses a freemium model with no fees to open, maintain, or close an account, and it earns mainly from Mastercard interchange fees and potential partnerships; all services run in-app with online support. The goal is to simplify everyday money tasks for Argentinians by offering a digital platform that combines payments, transfers, bill payments, and card access in one mobile app.

Company size
1,001-5,000
Company stage
Late Stage VC
Total funding
$1.2B
Headquarters
Buenos Aires, Argentina
Founded
2017

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