Billing Systems Developer (Php / Go), La Serena

Billing Systems Developer
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 global customer base.
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
Experience designing APIs and evolving system logic over time
Operations & Security
Strong debugging skills, especially with production data issues
Experience with cron jobs / scheduled processing and data migrations
Awareness of secure financial data handling, PCI, and RBAC
Why you'll love life at Command|Link
Room to grow at a high-growth company
An environment that celebrates ideas and innovation
Your work will have a tangible impact
Flexible time off
Fun events at cool locations
Employee referral bonuses to encourage the addition of great new people to the team
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