Senior Backend Engineer, Payments Team

SQUIRE; Palermo; Hybrid; ARS 4,000,000 - 8,000,000; Part time

Job summary

SQUIRE is seeking a Senior Backend Engineer to build and maintain payment systems and financial infrastructure for our platform. You will work within the Payments Team and Platform Community, focusing on scalable, robust payment flows and double-entry ledgers, while aligning with engineering leadership.

Responsibilities include design, reviews, and collaboration with product teams to ensure seamless payment integration and reliability, with in-office days in Buenos Aires on Tuesdays and

Qualifications

• At least 7 years of Node.js development experience.
• Proven payments/fintech domain experience in production.
• Understanding of authorization, capture, refund, void and chargebacks.
• Experience with reconciliation between internal and external systems.
• Knowledge of double-entry bookkeeping and financial ledgers.
• Designing idempotent operations in distributed payment systems.
• Strong architecture and best-practices background.
• Clear communication and collaboration, English required.
• Bachelor’s in CS preferred.

Responsibilities

• Build and maintain high-quality payment features and financial infrastructure using Node.js.
• Design and maintain reliable payment processing flows and ledgers with idempotent operations.
• Collaborate with product and other engineers to integrate payment systems with the platform.
• Participate in code reviews and feedback to improve code quality.
• Participate in interview panels and contribute to hiring practices.
• Contribute to Platform Community and share knowledge on policy direction.
• Work with Engineering Manager following guidance and direction.
• Troubleshoot and resolve defects in payment-critical systems.

Skills

Node.js

Payments domain

Payment lifecycle

Reconciliation

Financial ledgers

Idempotent operations

Architecture patterns

Communication

English proficiency

Education

Bachelor’s degree in Computer Science

Tools

Stripe APIs

Job description

Senior Backend Engineer plays a crucial role in building and maintaining payment systems and financial infrastructure for our platform application. This is a key position within the Payments Team, requiring deep domain expertise in payment processing and fintech. The role is part of the Platform Community, with hiring and technology policies defined and owned by the Engineering Manager.

Reports To: Engineering Manager

Location: Buenos Aires, ARG (Hybrid, In-office in CABA on Tuesdays and Thursdays)

Type: Contract

YOUR CRAFT (Job Duties & 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.

YOUR FOUNDATION (Experience & Skills)

• 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.

EXTRA CUT (Nice to Haves)

• Experience working with Stripe APIs and payment infrastructure.

A Few Things To Know About Our Hiring Process

We are committed to making hiring at SQUIRE fair, thoughtful, and accessible for every candidate. Below are a few important details about our hiring practices and policies.

Equal Employment Opportunity (EEO)

SQUIRE is an equal opportunity employer committed to providing equal employment opportunities to all applicants without discrimination or harassment based on any characteristic protected by applicable law.

Interview Accommodations

SQUIRE is committed to providing reasonable accommodations to individuals with disabilities throughout the hiring process. If you need an accommodation, please contact [e-mail].

AI in the Hiring Process

SQUIRE may use AI tools to support application reviews, resume analysis, and other parts of the hiring process. These tools assist our recruiting team, but all final hiring decisions are made by humans. If you would like more information about how your data is processed, please contact [e-mail].

E-Verify & Pre-Employment Screening

SQUIRE participates in E-Verify. Employment offers may be contingent upon successful completion of applicable pre-employment screening, including background checks, in accordance with applicable law.

Additional Resources & Legal Notices

• Know Your Rights: Workplace Discrimination is Illegal (EEOC)
• California Applicant Privacy Notice
• Pay Transparency Nondiscrimination Provision
• E-Verify Participation & Right to Work Posters
• Pre-Employment Screening Information