BILLING ASSISTANT

About the role

We are seeking a meticulous, proactive, and detail-oriented Billing Assistant to join our Business Operation department in Hong Kong (Kowloon Bay). Reporting to the Business Operation Manager / Billing Supervisor, you will play a vital role in executing day-to-day telecommunication and CPaaS billing processes, reconciling partner and customer traffic usage, and supporting cross-functional operations. This position offers an excellent growth opportunity for entry-level or junior professionals seeking to develop a strong operational career in the fast-growing global telecom and cloud technology industry.

Key responsibilities

• Assist in generating, verifying, and issuing monthly invoices, credit notes, and billing statements for global enterprise clients and carrier partners in accordance with agreed rate cards and service contracts.
• Collect and cross-check Call Detail Records (CDRs), SMS/messaging traffic logs, and platform usage metrics to ensure accuracy in billing data and dispute identification.
• Handle billing inquiries, investigate discrepancies, and collaborate with account managers and carrier partners to resolve billing disputes in a timely manner.
• Update and maintain customer billing profiles, pricing tables, exchange rates, and account parameters within internal billing platforms and ERP systems.
• Liaise closely with Sales, Customer Support, Network Operations, and Finance teams to support revenue assurance, collections, and month-end closing schedules.
• Prepare routine operational and billing reports, traffic summary dashboards, and variance analysis to support managerial decision-making.
• Participate in user acceptance testing (UAT) for billing system enhancements and assist in streamlining operational workflows for higher efficiency.

About you

• Higher Diploma or Bachelor's Degree in Business Administration, Accounting, Finance, Information Systems, Operations Management, or a related discipline.
• 1–2 years of experience in billing, business operations, accounting support, or data management. Fresh graduates with strong analytical abilities and internship experience are welcome to apply.
• Prior experience in Telecommunications, CPaaS, SaaS, Technology, or MNC environments is an added advantage.
• Proficient in MS Office suite, especially Microsoft Excel (e.g., VLOOKUP, Pivot Tables, basic formulas for data reconciliation). Familiarity with billing systems or ERP software (e.g., NetSuite, SAP, Oracle) is a plus.
• Strong numerical sense, meticulous attention to detail, and sound problem-solving skills when processing large volumes of data.
• Good command of written and spoken English and Chinese (Cantonese and Putonghua) for liaising with global partners and internal teams.
• Responsible, self-motivated, proactive attitude, and able to work independently as well as collaboratively under tight month-end schedules.

About us

M800 Limited is a leading global communications service provider headquartered in Hong Kong. Leveraging our robust global network infrastructure and innovative cloud CPaaS (Communication Platform as a Service) solutions, we deliver high-reliability voice, messaging, and telecom solutions to enterprises, carriers, and partners worldwide. At M800, we combine technological excellence with operational agility to drive continuous international growth. We offer a fast-paced, collaborative, and multicultural environment where talented professionals thrive.

Benefits

• Competitive remuneration package with performance-based discretionary bonus.
• Five-day work week.
• Comprehensive Medical Insurance coverage upon successful completion of the probation period.
• Dynamic, open, and multicultural office environment with vibrant team activities.