Billing Systems Developer (PHP / Go)

About Command|Link Command|Link is a global SaaS Platform providing network, voice services, and IT security solutions, helping corporations consolidate their core infrastructure into a single vendor and layering on a proprietary single pane of glass platform. Command|Link has revolutionized the IT industry by tackling the problems our competitors create. In recognition for our unprecedented innovation and dedication, Command|Link was recognized as the SD-WAN Product of the Year, ITSM Visionary Spotlight, UCaaS Product of the Year, NaaS Product of the Year, Supplier of the Year, and the AT&T Strategic Growth Partner. Command|Link has built the only IT platform for scale that solves ISP vendor sprawl and IT headaches. We make it easy for our customers to get more done, maximize uptime and improve the bottom line. Learn more about us https://www.commandlink.com/! This is a 100% remote position! 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 auditabilityIntegrate with payment gateways (Stripe, ACH, etc.)Ensure idempotent processing to prevent duplication and inconsistenciesDevelop reconciliation workflows to detect and resolve discrepanciesArchitect resilient systems with retry, rollback, and recovery mechanismsOptimize and manage large financial datasets, including historical dataBuild and maintain APIs for billing servicesDebug complex production data issues and support safe data migrationsPartner with finance, product, and engineering teams to evolve billing logicTakes 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 GoProficiency 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 transactionsUnderstanding of double-entry / ledger-based systemsKnowledge of taxes, proration, credits, and adjustmentsFamiliarity with payment processors (Stripe, ACH) Data & System Design Strong grasp of data integrity, ACID principles, and concurrencyExperience with audit trails, traceability, and reconciliationBackground in event-driven or queue-based architecturesExperience designing APIs and evolving system logic over time Operations & Security Strong debugging skills, especially with production data issuesExperience with cron jobs / scheduled processing and data migrationsAwareness 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 companyAn environment that celebrates ideas and innovationYour work will have a tangible impactFlexible time off  Fun events at cool locationsEmployee 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. Locations: Argentina; Brazil; Chile; Colombia; Costa Rica; India; Mexico; Philippines