Senior Backend Engineer - Payments & Fintech (Hybrid)

SQUIRE; Tandil; Hybrid; ARS 185,448,000 - 278,173,000; Full time

Job summary

SQUIRE is seeking a Senior Backend Engineer to build and maintain payment systems and fintech infrastructure within the Payments Team. This role reports to the Engineering Manager and is based in Buenos Aires with hybrid in-office days on Tuesdays and Thursdays.

You will own core payment features, design reliable processing flows, and collaborate across product and engineering to ensure seamless integration across the platform. Strong English communication is required.

Qualifications

• At least 7 years of Node.js application development experience.
• Proven experience in payments or fintech and production payment systems.
• Strong understanding of the payment processing lifecycle: authorization, capture, refund, void, and chargebacks.
• Experience with reconciliation between internal systems and external payment providers.
• Familiarity with financial ledgers and double-entry bookkeeping concepts.
• Experience designing idempotent operations in distributed payment systems.
• Strong knowledge of architecture patterns, frameworks, and best practices.
• Strong communication and collaboration skills.
• English proficiency to communicate with English-speaking coworkers.

Responsibilities

• 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.
• The duties and responsibilities outlined above are not a comprehensive list and additional tasks may be assigned from time to time based on business needs.

Skills

Node.js

Payments/Fintech domain

Payment processing lifecycle

Reconciliation processes

Financial ledgers & double-entry

Idempotent operations

Architecture patterns

English proficiency

Education

Bachelor's degree in Computer Science

Tools

Stripe APIs

Job description

SQUIRE is seeking a Senior Backend Engineer to build and maintain payment systems and fintech infrastructure within the Payments Team. This role reports to the Engineering Manager and is based in Buenos Aires with hybrid in-office days on Tuesdays and Thursdays.

You will own core payment features, design reliable processing flows, and collaborate across product and engineering to ensure seamless integration across the platform. Strong English communication is required.