Billing Assistant

Simpson Thacher & Bartlett LLP; New York (NY); On-site; USD 48,000 - 64,000; Full time

Job summary

Simpson Thacher & Bartlett LLP is seeking a Billing Assistant to support billing coordinators, attorneys, and staff with complex invoicing tasks in a fast-paced environment. You will prepare client invoices, review time entries, and execute edits and transfers in line with firm policy.

Responsibilities include filing bill packages, attending billing strategy meetings, and ensuring timely e-bill submissions. Strong communication, discretion, and accuracy are essential to succeed.

Qualifications

• Strong written and oral communication skills.
• Attention to detail and accuracy in invoicing.
• Ability to work under time pressure and meet deadlines.
• Proficiency with Microsoft Office and basic software.
• Ability to handle confidential information with discretion.
• Experience with client billing processes is a plus.

Responsibilities

• Assist Billing Coordinators with creating, editing, and processing high volume of invoices in a timely manner.
• Review invoices for misallocated time and ensure time entries comply with client guidelines.
• Edit draft invoices based on partner mark‑up and perform transfers, splits, and write‑offs per policy.
• Support filing of bill packages and maintain client/invoice records.
• Attend meetings to discuss monthly billing strategy and outstanding invoices.
• Handle e-invoice submissions via eBillingHub and client portals; resolve e-bill issues.
• Provide department‑wide administrative support and respond to inquiries promptly.
• Maintain confidentiality of client and firm information and adapt to new processes.

Skills

Strong communication

Attention to detail

Customer service

Analytical/problem solving

Time management/multi-tasking

Team collaboration

Discretion/confidentiality

Microsoft Office

Basic math

Adaptability

Tools

3E

eBillingHub

Job description

Under general supervision, the Billing Assistant is responsible for assisting billing coordinators, attorneys, and other non-legal staff with complex billing assignments and related billing inquiries. Responsibilities include preparation of client invoices, invoice processing, data maintenance and related administrative duties.

Responsibilities

• Assist Billing Coordinators with creating, editing, and processing high volume of invoices in a timely manner.
• Review invoices for misallocated time and ensure time entries are in accordance with client guidelines.
• Edit draft invoices based on partner mark‑up, including: time entry narrative changes, fee/cost transfers, splitting entries, unblocking entries, on‑account applications, and write‑offs in accordance with firm policy.
• Assist Billing Coordinators with the filing of bill packages in accordance with department policy.
• Attend meetings with Billing Managers, Billing Coordinators, and/or Partners to discuss monthly billing strategy and outstanding invoices.
• Maintain and update special instructions and internal comments related to billing attorneys’ clients and matters.
• Assist with electronic invoice submissions by submitting e‑bills via eBillingHub and/or the client’s designated e‑billing website.
• Assist with identifying e‑billing issues; work to resolve e‑bill rejections and short payments.
• Provide department‑wide administrative support as needed (ie. filing, providing client invoice copies, pulling expense back up, etc.). Respond to inquiries and requests for information made by attorneys, secretaries, legal and non‑legal staff using effective communication skills, both oral and written, in a timely manner.
• Actively seek to enhance knowledge of all billing related processes and procedures.
• Use sound judgement when approaching problems and making decisions.
• Observe confidentiality of client and firm matters.
• Assist with special projects.
• Flexibility to work additional hours as needed.
• Perform other duties as assigned.

Required Skills

• Strong communication skills, both written and oral
• Ability to effectively present information verbally and in writing
• Basic math skills: add, subtract, multiply, divide, percentage calculations, etc.
• Knowledge of Microsoft Office Suite, with the ability to learn new software and operating systems.
• Ability to work effectively, independently, at times with minimal supervision, in a fast‑paced environment
• Must be able to work collaboratively in a team environment
• Strong attention to detail
• Strong customer service skills
• Demonstrated analytical and problem‑solving skills
• Can organize, prioritize, plan and multi‑task work activities, with the ability to effectively meet deadlines in a high‑pressure environment
• Ability to adapt to all work situations in order to achieve desired results
• Ability to use discretion with sensitive and confidential information

Preferred Skills

• 1-2 years billing, finance or accounting experience in a law firm environment
• 1 year experience with 3E and