Principal Engineer vs. Senior Engineer: Roles and Duties

By Indeed Editorial Team

Published 20 June 2022

The Indeed Editorial Team comprises a diverse and talented team of writers, researchers and subject matter experts equipped with Indeed's data and insights to deliver useful tips to help guide your career journey.

Principal engineers and senior engineers are two of the highest-ranking positions in the engineering profession. While principal and senior engineers share some similarities in their roles and responsibilities, there are key differences that distinguish these two jobs. Knowing the differences between principal and senior engineers can help you determine which is the right career path for you. In this article, we compare the differences between a principal and senior engineers to help you explore these two career paths.

Role of a principal engineer vs. a senior engineer

Here's a comparison of the role of a principal engineer vs. a senior engineer:

Principal engineer

A principal engineer is a high-level professional with many years of experience in their engineering field. While they can work in various fields, such as civil or electrical engineering, they have extensive experience in their area of speciality. They usually have a leadership role within an organisation, directly overseeing various projects and a staff of engineers. They provide guidance to engineering teams to ensure they meet project requirements and complete projects within budget and on schedule.

A principal engineer usually serves as the lead engineering professional within an organisation. They report directly to senior company leadership, such as directors or stakeholders. An engineer may transition into a principal role after working as a senior engineer for several years.

Senior engineer

A senior engineer is a professional who has experience managing complex engineering projects. Similar to principal engineers, senior engineers can work in nearly every engineering field, such as mechanical or software engineering. These engineers often lead various engineering projects because they have the most technical experience in an engineering team or department. Some senior engineers serve as mentors to junior or staff engineers, but they don't directly manage other employees.

In some companies, the role of a senior engineer is an unofficial title given to staff engineers who have worked with the organisation for many years, while other companies specifically hire senior engineers. These professionals typically report to an engineering manager, director of engineering or a principal engineer. Senior engineers can apply for principal engineer positions if they can show effective leadership skills.

Related: Top 8 Engineer Titles: Job Descriptions and Skills

Duties of principal engineer vs. senior engineer

Within their roles, both principal engineers and senior engineers typically have a wide range of job duties. While their responsibilities may vary based on their engineering field and employer, both principal and senior engineers typically have some common responsibilities. Here's a comparison of their job duties:

Principal engineer

As leaders within a company, principal engineers typically provide input into the direction of an organisation and its engineering projects. They develop and implement solutions to help a company increase its growth and profitability. A principal engineer's duties may include:

  • collaborating with other senior employees or executives to conduct strategic planning for a company

  • planning and developing engineering strategies to help a company grow and succeed

  • setting engineering goals for a company and developing strategies to meet those objectives

  • managing an engineering department or various departments to lead teams effectively

  • providing technical expertise to other engineers within a department

  • developing and overseeing engineering budgets for a company

  • negotiating contracts with clients or vendors to complete projects within budget

  • identifying and implementing strategies to improve productivity or efficiency

Senior engineer

Compared with principal engineers, senior engineers typically have more technical responsibilities. They use their specialised skill sets to develop solutions and complete projects. Here are some common duties of a senior engineer:

  • meeting with managers, stakeholders or clients to understand project requirements and expectations

  • performing research to determine project specifications, industry standards or engineering solutions

  • designing engineering plans or blueprints and presenting them to stakeholders or clients

  • overseeing budgets, timelines and outcomes to keep projects progressing on schedule

  • planning for long-range engineering projects based on company goals

  • preparing project reports for managers or stakeholders to detail progress

  • mentoring or providing technical advice to other engineers to ensure high-quality outcomes

  • providing advice or recommendations to managers for engineering processes

Related: What Does an Engineer Do? (Roles and Responsibilities)

Other differences between principal engineer vs. senior engineer

Besides their different roles and responsibilities, there are various other distinctions between a principal engineer and a senior engineer. Here are some other key differences between these two types of engineering professionals:


Both principal engineers and senior engineers usually earn a Bachelor of Engineering degree. Most engineers choose an area of focus while earning their degree, such as civil or mechanical engineering. During these undergraduate programmes, students take a variety of courses to learn the fundamentals, systems and processes related to their chosen specialisation of engineering. While not a requirement for principal engineer positions, an advanced degree can be helpful for these professionals.

Earning an advanced degree can help engineers show their specialised expertise when applying for principal engineer positions. Some principal engineers choose to earn a master's degree in their engineering area. Others earn a Master of Business Administration or a Master of Science in engineering management, which can help them learn and develop essential leadership and business skills.

Related: How to Become an Engineer (With Qualifications and Skills)


Most employers require both principal engineers and senior engineers to have many years of experience in their engineering field. The required experience for these positions can vary widely based on the employer. Many companies require both senior and principal engineers to have at least 10 to 15 years of experience as an engineer. Some companies may prefer to hire principal engineers who have worked as senior engineers for several years before advancing into this leadership role.

Technical knowledge

Both principal and senior engineers have extensive technical knowledge in their fields. They gain this technical knowledge over many years by conducting research, designing plans and implementing engineering solutions. Senior engineers continue to use their technical knowledge to design and oversee engineering projects. They use their knowledge of engineering fundamentals to complete projects with a high quality of work. Principal engineers use their technical knowledge to improve engineering processes or make advancements in their field.


While principal and senior engineers typically have similar technical skills, these two professionals can also benefit from having various other skills to perform their job tasks. Some helpful skills for principal engineers include:

  • Business acumen: It's helpful for principal engineers to have a strong business acumen so they can manage engineering departments and provide input on a company's strategic planning.

  • Delegation: Many principal engineers use their delegation skills to assign tasks to other employees, including senior engineers, to manage their time effectively.

  • Leadership: It's important for principal engineers to have leadership skills so they can oversee engineering departments and motivate engineers to achieve departmental goals.

Here are some helpful skills for senior engineers:

  • Problem-solving: Senior engineers use their problem-solving skills to identify challenges, collect data and information and develop engineering solutions to resolve issues.

  • Organisation: Typically, senior engineers work on a variety of projects simultaneously, so they can use organisational skills to manage their different tasks while remaining focused on completing projects with strong attention to detail.

  • Interpersonal skills: Senior engineers often serve as mentors for other staff engineers, so it's helpful for them to have interpersonal skills so they can build relationships with others and offer advice or technical expertise.

Related: 13 Important Skills for Engineers (With Definition and Examples)


While both principal and senior engineers have high-ranking positions, there are opportunities for both engineers to advance in their careers. Some larger companies hire senior principal engineers or distinguished principal engineers. It's common for principal engineers to pursue these advancements after working in their position for several years or more. Senior engineers can advance to become principal engineers after gaining leadership and mentorship experience through managing projects.

Tips for becoming a principal engineer or senior engineer

While principal engineers and senior engineers have some differences in their roles and responsibilities, both types of engineers are high-level professionals within an organisation. Here are some tips to help you pursue a career as a senior or principal engineer:

  • Continue learning. Throughout your engineering career, it's important to continue learning so you can strengthen your skill set. Stay updated on industry trends and take time to develop valuable soft skills, such as leadership or organisation.

  • Ask for more responsibilities. Once you become technically proficient in your engineering field, ask your supervisor or manager for more responsibilities in your position. For example, you can ask to lead a small project or volunteer to prepare a project proposal for a new client.

  • Join a professional organisation. It's helpful to join a professional engineering organisation so you can network with other engineers, develop new skills and learn about job opportunities. Research different organisations, such as the Hong Kong Institution of Engineers, to find a group you can join.

Please note that none of the companies, institutions or organisations mentioned in this article are affiliated with Indeed.

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