Billing Systems Developer (PHP / Go)
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 global 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 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 Join us at CommandLink, where you'll have the opportunity to shape the future of business communication. We value the innovative spirit and seek individuals ready to bring their unique vision and expertise to a team that values bold ideas and strategic thinking. Are you ready to make an impact? Apply now and be the architect of your career as well as our clients' success. 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 At CommandLink, we’re committed to creating a fair, consistent, and efficient hiring experience. As part of our process, we use AI-assisted tools to help review and analyze applications. These tools support our recruiting team by identifying qualifications and experience that align with the requirements of each role. AI tools are used only to assist in the evaluation process — they do not make final hiring decisions. Every application is reviewed by a member of our recruiting or hiring team before any decisions are made.