Say it like this
- We need a principal engineer to review the system design
- Principal engineers at our company set the technical direction
- I'm working with our principal engineers on this architecture decision
Use it at work
Career
- She was promoted to principal engineer.
- What's the difference between staff and principal engineer here?
Work
- Our principal engineer is reviewing the architecture.
- Let's get the principal engineer's view on this.
In an interview
- As a principal engineer, I lead decisions across teams.
- How many principal engineers do you have?
Don't say this
Principal engineers are individual contributors with technical influence, not necessarily managers. They lead through expertise, not management authority.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| principal engineer | Very senior technical leader across the org | Senior ICs | Company-wide decisions |
| staff engineer | Senior technical leader across teams | Senior ICs | Multi-team work |
| tech lead | Leads one team's technical work | Senior engineers | Team level |
Practice
Try it
4 quick exercises
1. You need expert input on a critical system design. How would you say it?
2. After 10 years in the company, Maria was finally promoted to ________.
3. Which sentence uses principal engineer incorrectly?
4. Rewrite this using principal engineer: 'We have a very senior technical person who helps solve hard problems and teaches other engineers.'
Say it out loud
Phrase 1 of 3
"We need a principal engineer to review the system design"
We don't save your recording. The word check uses your browser's speech recognition.
More about principal engineer
Real examples(3)
- in a standup
"The principal engineer suggested we refactor the database layer before scaling further."
- in a code review
"Our principal engineers are expected to mentor junior developers and provide architectural guidance."
- in a team meeting
"We should loop in the principal engineer on this infrastructure decision because it affects multiple services."
More mistakes(2)
Handle with care. Do not confuse with senior engineer or staff engineer—principal engineer is a distinct senior level role with broader architectural and mentorship responsibilities. Also avoid using it as a verb.
- ✕We need to principal engineer this solution.✓We need to get the principal engineer to review this solution.
Principal engineer is a job title, not a verb. You cannot use it as an action verb.
- ✕He is a principal engineer, so he knows everything.✓He is a principal engineer who specializes in backend systems.
Principal engineers have deep expertise in specific areas, not necessarily in all areas of technology.
Other forms(2)
- principal engineer noun
"The principal engineer designed the new microservices architecture."
- principal engineers (plural) noun
"Our principal engineers collaborate to define engineering standards."
Often used with(5)
- promote to principal engineer · Describes advancement to this senior role
- principal engineer team · Refers to a group of principal engineers in an organization
- principal engineer role · Used when discussing the responsibilities and expectations of the position
- principal engineer mentor · Highlights the mentoring aspect of the role
- consult a principal engineer · Seeking expert technical guidance from a principal engineer
Similar words(4)
- senior engineer · Lower tier; senior engineers report to or are mentored by principal engineers
- staff engineer · Overlapping role but varies by company; some organizations use staff engineer as the equivalent to principal engineer
- technical fellow · Even more senior than principal engineer; a distinguished title for the highest technical leaders
- engineering leader · Broader term that can include managers; principal engineers are technical leaders without management duties
Opposites(3)
- junior engineer
- entry-level engineer
- intern
Questions(5)
- What is the difference between a principal engineer and a senior engineer?
- A principal engineer is a more senior role than a senior engineer. Principal engineers have broader organizational influence, set technical standards, and mentor senior engineers. They typically own critical infrastructure or architectural decisions across multiple teams, while senior engineers are individual contributors with deep expertise in specific areas.
- Do principal engineers manage people?
- Not necessarily. Principal engineers are individual contributors who lead through technical expertise and influence, not through formal management authority. Some organizations may have principal engineers who also manage teams, but the core responsibility of the role is technical contribution and architectural leadership.
- How do you become a principal engineer?
- Typically, you advance from senior engineer to principal engineer by demonstrating expertise in complex systems, successfully leading large technical initiatives, earning respect across teams, and showing the ability to influence technical direction. Different companies have different criteria, but usually you need 8-15 years of experience and a track record of impact.
- Is principal engineer a formal or informal role?
- Principal engineer is a formal job title and role in most tech companies. It is used formally in job descriptions, org charts, and official communications, though it can also be used in everyday conversation in tech workplaces.
- What does a principal engineer do on a daily basis?
- Daily responsibilities vary but typically include reviewing architectural decisions, conducting code reviews, mentoring junior engineers, solving complex technical problems, collaborating with other teams, and contributing to long-term technical strategy. The balance between hands-on coding and advisory work depends on the company and the individual.
