CMS is looking for a Billing Assistant to join our Sofia team. The role will be supporting Partners and Associates with their pre/post-billing related administrative activities. The person will be an integral part of our Finance department ensuring the accurate and timely drafting and preparation of invoices.

We are an international law firm with leading businesses throughout Europe, The Middle East, Asia and beyond. We create sustainable and rewarding futures for our clients, our people and our communities. Ranked as the worlds 5th largest law firm by lawyer headcount and 6th largest in the UK by revenue, CMS works with clients in over 40 countries from 70+ offices worldwide. CMS is well equipped to help our clients face the future with confidence. We are driven by technology and readily embrace the possibilities it opens for developing new and better ways of delivering legal services. And we recruit, value and nurture top talent.

CMS is presenting an excellent opportunity for a highly motivated person for the position of

Billing Assistant (Ref: BAA)

Core Position Expectations:

• Dealing with billing related queries
• Preparation of covering documents on generated bills
• Monitoring client database for accuracy
• Facilitating the dispatch of bills in line with the clients requirements and the firm policy
• Liaising with the eBilling team for billing guidelines and portal requirements
• Assistance with other post billing queries and generating reports
• Works to given timeframes and anticipates uneven workflows
• Support office cash collection
• Effective communication with our clients.

Requirements:

• Degree in Economics or Finance, or final-year student in Economics or Finance
• Previous experience on similar position would be considered a plus
• Fluent in Bulgarian and very good knowledge of English, both spoken and written
• Good computer skills and knowledge of MS Outlook, Excel, Word
• Willing to do routine tasks
• Ability to multi-task and meet strict deadlines
• Self-motivated, proactive and ability to prioritise and manage own workload
• Able to use initiative, but also work well within a team
• Responsible for managing own development, willing to learn and follow instructions.

We offer:

• Work with a positive and supportive team
• Competitive remuneration
• Benefit package
• Company training and excellent opportunities in multinational environment
• Modern office in the very centre of Sofia.

At CMS a next-generation mindset is woven into all we do. We are diverse, supportive, and inclusive, embracing our corporate social responsibility and creating a culture of sustainability in which every one of our people, whatever their background, can maximise their potential and thrive.

Interested applicants are invited to send their CV and motivation letter by 20 June 2026.

Only short-listed candidates will be invited for an interview.

Whats in it for you?

As a future facing firm, we take a bold, dynamic and agile approach to help clients of every size face the future with confidence. We empower and support our people to realise their ambitions through access to high quality, interesting and engaging work alongside a competitive package.

Please note that we have a preferred agency panel in place. Only applications submitted via the portal at the point of instruction will be accepted.

Location: Sofia - EOOD

Time Type: Full time