How to Write a Resume After 20 Years at One Company

Staying with one employer for a long time says a lot of good things about you. You were trusted, reliable, and valued. But writing a resume after many years in one place can feel strange. Your old resume may be decades out of date, and much of what you did was described in terms only your company used.

This guide shows how to turn long service into a clear, modern resume.

What to do first

Gather what you need before you start writing:

• A list of every title you held and roughly when
• Performance reviews, awards, or thank-you notes
• Major projects, changes, or improvements you led or supported
• Software, systems, and tools you used
• Training, certifications, or courses you completed

Do not worry about formatting yet. Just collect the facts.

How to show several roles at one employer

The clearest way is to list the employer once, then show your roles beneath it, most recent first.

Regional Health System, City, State Billing Supervisor, 2017 to 2026

• Led a team of six through a switch to a new billing system with no gap in service.
• Trained new staff and wrote the department's first procedures guide.

Senior Billing Specialist, 2011 to 2017

• Resolved complex insurance claims and served as the team's go-to person for appeals.

This format shows growth and promotions at a glance. For roles before the last 10 to 15 years, consider whether the detail is necessary for the role. You can summarize them in one line, such as "Earlier roles: Billing Clerk, Patient Registration." See how far back your resume should go.

Translate company language

Every organization has its own vocabulary. A new employer may not know what a "Level 3 Associate" or "ProjectStream" means.

• Use common job titles. If your title was unusual, add a plain description. For example, "Team Lead III (Customer Service Supervisor)."
• Name the type of tool, not just the internal name. For example, "company scheduling software" or "a customized inventory system."
• Describe the scale. How many people, customers, or locations were involved?

Focus on results

Employers want to know what you achieved, not only what you were responsible for. For each role, think about:

• Problems you solved
• Processes you improved
• Money or time you helped save
• People you trained or mentored
• Changes you helped your team get through

Use numbers only if you know them to be accurate. If you do not have exact figures, describe the result in words, such as "reduced customer complaints" or "cut processing time."

Show that you adapt to change

Some employers worry that someone who stayed in one place for a long time may struggle with a new environment. You can address that directly on your resume.

• Highlight times your company went through change, such as new systems, mergers, or reorganizations, and your role in them.
• List recent training and software skills.
• Mention cross-department projects or work with outside partners.

Write a short summary

At the top of your resume, add three or four lines that describe who you are and what you offer. For example:

"Billing and revenue cycle professional with deep experience in healthcare finance. Known for training teams, managing system changes, and resolving complex claims. Comfortable with electronic health records and current billing software."

Avoid phrases that emphasize length of time, such as "over 30 years of experience." Focus on skills and value instead.

Make it work with online systems

Many employers use an applicant tracking system (ATS), software that scans resumes for keywords. To work with it:

• Use a simple layout without tables, columns, or graphics.
• Use standard headings such as "Experience," "Education," and "Skills."
• Include words from the job posting where they honestly describe your experience.

Our lesson on what an ATS is explains more. If you want help with wording, see using AI to help with a resume, and always check the result for accuracy.

Common mistakes to avoid

• Listing your employer separately for each role, which makes the resume long and repetitive.
• Using internal jargon that outside readers will not understand.
• Describing duties instead of results.
• Leaving out recent training and current skills.
• Using a resume format from many years ago.

Where to find help

• American Job Centers offer free resume help. Find one at CareerOneStop (opens in a new tab).
• Our resume guide for experienced workers covers each section in detail.
• Our guide to transferable skills helps you describe your experience for new fields.

Your next steps

1. List your roles and key results at your long-time employer.
2. Group them under one employer heading, most recent first.
3. Replace internal terms with plain language.
4. Add a short summary and a current skills section.
5. Ask someone outside your old company to read it and tell you what is unclear.