Backend Engineer, Payments Team

SQUIRE

Senior Backend Engineer maintaining payment systems and infrastructure for fintech. Requires expertise in payment processing and collaboration with cross-functional teams.

Posted 4/25/2026full-timeBuenos Aires • 🇦🇷 ArgentinaSeniorLeadWebsite

Tech Stack

Tools & technologies

JavaScriptNode.js

About the role

Key responsibilities & impact

Build and maintain high-quality payment features and financial infrastructure using Node.js.
Design, implement, and maintain reliable payment processing flows, reconciliation processes, financial ledger systems including double-entry bookkeeping, and idempotent payment operations.
Collaborate with the product team and other engineers to ensure seamless integration of payment systems with the broader platform.
Actively participate in code reviews, providing and receiving constructive feedback to improve overall code quality.
Participate in interview panels related to platform development hiring.
Contribute to the Platform Community, sharing knowledge and helping to shape hiring and technology policies.
Work closely with the Engineering Manager, following the guidelines and direction provided by the Engineering Manager.
Troubleshoot and resolve software defects and other technical issues in payment-critical systems.

Requirements

What you’ll need

At least 7 years of experience in application development using Node.js.
Proven experience in the payments or fintech domain, including working with payment processing systems in production.
Strong understanding of the payment processing lifecycle: authorization, capture, refund, void, and chargebacks.
Experience with reconciliation processes between internal systems and external payment providers.
Familiarity with financial ledgers and double-entry bookkeeping principles.
Experience designing idempotent operations in distributed payment systems.
Strong knowledge of architecture patterns, frameworks, and best practices.
Strong communication and collaboration skills.
Bachelor’s degree in Computer Science is preferred.
English proficiency is a must. It’s important you can communicate your ideas clearly as you will be interacting with English-speaking coworkers.
Must be based in Buenos Aires.
Availability to work on-site in our office in CABA two days a week (Tuesdays and Thursdays).

Benefits

Comp & perks

Interview Accommodations
Equal Employment Opportunity
Pay Transparency Nondiscrimination Provision

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

Node.jspayment processingreconciliation processesdouble-entry bookkeepingidempotent operationsarchitecture patternsframeworksbest practicesapplication developmentsoftware defect troubleshooting

Soft Skills

communication skillscollaboration skillsconstructive feedbackknowledge sharinginterpersonal skills

Certifications

Bachelor’s degree in Computer Science