Bookkeeping & Accounting
- Monthly bookkeeping and transaction review
- Accounts payable and receivable
- Bank and credit card reconciliations
- Financial statement preparation
- Month-end close
- Payroll accounting support
Accounting, Bookkeeping, Tax & Fractional CFO Services. Clarity and confidence in your numbers.
A boutique accounting and financial management firm helping small and growing businesses simplify their finances and build a stronger financial foundation.
Based in the Greater Atlanta area. Serving businesses remotely across the United States.
About Optimum Finance & Management
A Trusted Financial Partner for Growing Businesses
We're a boutique accounting and financial management firm based in the Greater Atlanta area, helping small and growing businesses simplify their finances and build a stronger financial foundation. We provide bookkeeping, accounting, tax preparation, and fractional CFO services tailored to the needs of business owners.
What sets us apart is our hands-on, business-focused approach. We combine accurate bookkeeping and accounting with financial analysis and strategic guidance to help our clients understand their numbers, improve cash flow, control expenses, increase profitability, and make informed business decisions.
We believe financial information should do more than record what happened — it should help business owners understand where they are, identify opportunities, manage risks, and make better decisions for the future.
Hands-On Approach
We work closely with you to provide the financial clarity and support your business needs to operate efficiently.
Beyond Bookkeeping
Accurate records combined with financial analysis and strategic guidance — not just data entry.
CFO-Level Insight
Professional accounting, tax, and CFO-level guidance accessible without a full-time finance team.
- Bookkeeping
- Accounting
- Tax Preparation
- Fractional CFO
- Payroll Support
- QuickBooks
- Cash-Flow Forecasting
- Financial Reporting
- Data Analytics
Services
Financial support that helps your business grow.
Professional bookkeeping, accounting, tax preparation, financial analysis, and fractional CFO services for small and growing businesses.
Tax Preparation
- Business federal and state tax preparation
- Individual federal and state tax preparation
- Organizing financial information for filing
- Sales tax support
- Year-round tax readiness
Fractional CFO & Financial Analysis
- Budgeting and forecasting
- Cash-flow analysis and forecasting
- Financial reporting and management reporting
- Variance and liquidity analysis
- Strategic financial guidance
QuickBooks & Data Analytics
- QuickBooks Online setup and organization
- Bookkeeping cleanup
- Ongoing QuickBooks accounting support
- Excel, SQL, and Python-based data analysis
- Turning financial data into meaningful insights
Every engagement is tailored to your business — from monthly bookkeeping to CFO-level guidance, without the cost of a full-time finance team.
Pricing
Pricing tailored to your business.
Every business is different, so every engagement is priced around the scope of support you actually need. Get in touch for a custom quote.
Bookkeeping & Accounting
Custom
monthly engagement
Tax Preparation
Custom
per return
Fractional CFO & Advisory
Custom
scoped engagement
Tell us about your business and what you need help with, and we'll put together a clear, straightforward quote.
For your convenience, we accept major credit and debit cards, ACH bank transfers, and checks.
Our Work
Small Business Financial Management & Analytics
A comprehensive accounting and financial analysis project designed to help a growing business improve the accuracy, organization, and visibility of its financial information.
The project included QuickBooks Online bookkeeping, bank and account reconciliations, accounts payable and receivable management, month-end close, financial statement preparation, and financial performance analysis. Using Excel and data analytics techniques, financial information was organized and analyzed to identify trends, variances, and opportunities for improvement.
The project demonstrates how accurate accounting records can be transformed into meaningful financial insights that help business owners better understand cash flow, expenses, profitability, and overall business performance.
- QuickBooks Online
- Bookkeeping
- Financial Reporting
- Reconciliations
- AP/AR
- Month-End Close
- Excel Analytics
- Financial Analysis
- Cash-Flow Analysis
Testimonials
What clients say.
Optimum Finance & Management brought order to our books and gave us a clear picture of our finances for the first time. The monthly reporting alone has been worth it.
Guillaume is responsive, thorough, and genuinely invested in our success. He explains our numbers in a way we actually understand.
From cleanup to ongoing bookkeeping and tax prep, everything is handled professionally. We finally feel confident making decisions from our financials.
Guillaume Kouassi
Founder, Optimum Finance & Management
Meet Guillaume
Accounting expertise meets financial insight.
Guillaume Kouassi is an accounting and finance professional and the founder of Optimum Finance & Management, serving businesses throughout the Greater Atlanta area and remotely across the United States.
With years of experience in accounting, bookkeeping, accounts payable and receivable, financial reconciliations, month-end close, financial reporting, and financial analysis, Guillaume has supported businesses across a variety of industries and organizational environments.
His professional experience includes working as a Back Office Expert at Intuit, where he managed accounting activities for a portfolio of small-business clients — strengthening his ability to understand the unique financial needs of different businesses while maintaining accuracy, organization, and responsiveness.
Guillaume is a Certified QuickBooks Online ProAdvisor and brings a strong background in data analysis and financial analytics, using Excel, SQL, and Python to organize, analyze, and interpret business and financial data. This combination allows him to go beyond recording transactions and help business owners identify trends, analyze performance, and gain greater visibility into their businesses.
Guillaume holds an MBA in Finance and a Bachelor of Science in Business Management from Colorado State University, and is currently preparing for the Certified Management Accountant (CMA) certification.
His philosophy is simple: accounting should do more than record the past — it should provide the clarity and insights businesses need to plan, grow, and succeed. Guillaume is fluent in English and a native French speaker, allowing Optimum Finance & Management to serve a diverse range of business owners.
- Certified QuickBooks Online ProAdvisor
- MBA in Finance
- Former Intuit Back Office Expert
- English & Français
Blog
Insights for small business owners.
Practical articles on bookkeeping, taxes, cash flow, and understanding your numbers.
September 2026
Why Accurate Bookkeeping Matters More Than You Think
Bookkeeping isn't just record-keeping — it's the foundation every good business decision is built on.
Read article
September 2026
Profit Isn't Cash: Understanding Your Cash Flow
A profitable business can still run out of money. Here's why cash flow deserves its own attention.
Read articleAugust 2026
Getting Ready for Tax Season Without the Stress
Tax season is much easier when your financial information is organized all year long.
Read article
Gain Clarity and Confidence in Your Finances.
Get professional accounting, bookkeeping, tax, and CFO-level guidance tailored to what your business actually needs.
Based in the Greater Atlanta area. Serving clients remotely across the U.S.
Contact
Let's talk about your business.
Send a message with what you need help with and Guillaume will follow up personally.
- info@optimumfinancemanagement.com
- (720) 453-6603
- Greater Atlanta Area
Serving clients remotely across the U.S.
What happens next
- Tell us about your business and what you need help with.
- Guillaume reviews your message and follows up personally.
- You receive a custom quote built around your needs — no obligation.