Billing Systems Developer (General Rodríguez)

About Your New Role We’re seeking a Billing Systems Developer to build and scale the financial systems that power Command|Link’s platform. This role sits at the intersection of engineering, finance, and data, ensuring billing is accurate, resilient, and fully auditable across a general customer base.

You’ll own key components of billing, from invoicing and payments to reconciliation and reporting, where precision and reliability are critical.

Key Responsibilities
- Design and develop scalable billing systems (invoicing, usage-based billing, credits, taxes, proration)
- Build and maintain ledger-based financial systems with full auditability
- Integrate with payment gateways (Stripe, ACH, etc.)
- Ensure idempotent processing to prevent duplication and inconsistencies
- Develop reconciliation workflows to detect and resolve discrepancies
- Architect resilient systems with retry, rollback and recovery mechanisms
- Optimize and manage large financial datasets, including historical data
- Build and maintain APIs for billing services
- Debug complex production data issues and support safe data migrations
- Partner with finance, product, and engineering teams to evolve billing logic
- Takes on additional responsibilities and projects as needed to support the success of the team and organization.

What You'll Need For Success Core Engineering
- Strong experience with PHP and/or Go
- Proficiency in MySQL (joins, indexing, performance tuning)
- Comfortable in Linux/Unix environments (Bash, command line)
- Experience with Git

Financial Systems
- Experience with billing, payments or financial transactions
- Understanding of double-entry / ledger-based systems
- Knowledge of taxes, proration, credits, and adjustments
- Familiarity with payment processors (Stripe, ACH)

Data & System Design
- Strong grasp of data integrity, ACID principles and concurrency
- Experience with audit trails, traceability and reconciliation
- Background in event-driven or queue-based architectures
- Postúlate en Kit Empleo: kitempleo.com.ar/empleo/pueaw