Principal Software Engineer

Onto Innovation; Wilmington (DE); On-site; USD 144,000 - 216,000; Full time

Benefits offered by this job

Health, dental, and vision coverage

401(k) with employer match

Employee Stock Purchase Program (ESPP)

Job summary

Onto Innovation in Wilmington, Delaware, is seeking a Principal Software Engineer in Test to drive quality across the software lifecycle. You will lead a team of SDETs, shape testing strategies, and collaborate with engineering, product, and DevOps to deliver scalable, reliable software.

The role emphasizes shift-left quality, automation across UI/API/performance, and integration with CI/CD. You will mentor and grow the team while championing testability and observability.

Qualifications

• 8+ years of experience in software testing/quality engineering.
• 3+ years in a technical leadership or team lead role.

Responsibilities

• Lead, mentor, and grow a team of Software Engineers in Test.
• Define and implement the overall quality strategy, test architecture, and automation roadmap.
• Establish best practices for test automation, CI/CD integration, and quality engineering.
• Drive a shift-left testing approach and promote a culture of quality ownership across teams.
• Design, develop, and maintain scalable test automation frameworks (UI, API, performance, and integration).
• Ensure high test coverage through automated testing strategies.
• Improve test reliability, execution speed, and maintainability.
• Conduct root cause analysis of defects and implement preventive measures.
• Contribute to code reviews, ensuring testability and quality standards.

Skills

Java

Python

C#

JavaScript

Test automation

Selenium

Cypress

Playwright

CI/CD

Jenkins

GitHub Actions

API testing

Microservices

Distributed systems

AI tools

Education

Bachelor’s degree in Computer Science/Engineering

Tools

Selenium

Cypress

Playwright

Appium

RestAssured

Jenkins

GitHub Actions

Azure DevOps

Job description

Onto Innovation is a leader in process control, combining global scale with an expanded portfolio of leading-edge technologies that include: 3D metrology spanning the chip from nanometer-scale transistors to micron-level die-interconnects; macro defect inspection of wafers and packages; metal interconnect composition; factory analytics; and lithography for advanced semiconductor packaging. Our breadth of offerings across the entire semiconductor value chain helps our customers solve their most difficult yield, device performance, quality, and reliability issues. Onto Innovation strives to optimize customers’ critical path of progress by making them smarter, faster and more efficient.

Job Summary & Responsibilities

Job Summary

We are seeking a highly skilled and experienced Principal Software Engineer in Test to drive quality engineering practices across our software development lifecycle. This role combines deep technical expertise in test automation with leadership responsibilities, ensuring high-quality, scalable, and reliable software systems. The ideal candidate will lead a team of SDETs, define testing strategies, and collaborate closely with engineering, product, and DevOps teams.

Key Responsibilities

Leadership & Strategy

• Lead, mentor, and grow a team of Software Engineers in Test.
• Define and implement the overall quality strategy, test architecture, and automation roadmap.
• Establish best practices for test automation, CI/CD integration, and quality engineering.
• Drive a shift-left testing approach and promote a culture of quality ownership across teams.

Technical Execution

• Design, develop, and maintain scalable test automation frameworks (UI, API, performance, and integration).
• Ensure high test coverage through automated testing strategies.
• Improve test reliability, execution speed, and maintainability.
• Conduct root cause analysis of defects and implement preventive measures.
• Contribute to code reviews, ensuring testability and quality standards.

Collaboration

• Partner with developers, product managers, and DevOps engineers to define acceptance criteria and quality metrics.
• Participate in sprint planning, backlog grooming, and release planning.
• Advocate for testability, observability, and resilience in system design.
• Work closely with CI/CD teams to integrate automated tests into pipelines.

Quality Assurance & Metrics

• Define, track, and report quality KPIs (defect density, test coverage, automation pass rate, etc.).
• Drive continuous improvement of testing processes and tools.
• Ensure compliance with performance, security, and scalability standards.

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).
• 8+ years of experience in software testing/quality engineering.
• 3+ years in a technical leadership or team lead role.
• Strong programming skills in languages such as Java, Python, C#, or JavaScript.
• Expertise in test automation frameworks (e.g., Selenium, Cypress, Playwright, Appium, RestAssured).
• Experience with API testing, microservices architecture, and distributed systems.
• Experience with generative/agentic AI tools like MS Copilot
• Hands-on experience with CI/CD tools (e.g., Jenkins, GitHub Actions, Azure DevOps).
• Strong understanding of Agile/Scrum methodologies.

Preferred Qualifications

• Experience with performance testing tools (e.g., JMeter, Gatling, k6).
• Knowledge of containerization and cloud platforms (e.g., Docker, Kubernetes, AWS, Azure).
• Familiarity with test data management and service virtualization.
• Experience implementing test strategies in large-scale, enterprise environments.

Why Join Onto Innovation?

At Onto Innovation, we believe your work should matter—and so should your well-being. That’s why we offer competitive salaries and a comprehensive benefits package designed to support you and your family. From health, dental, and vision coverage to life and disability insurance, PTO, and a 401(k) with employer match, we’ve got you covered. You’ll also enjoy access to our Employee Stock Purchase Program (ESPP), wellness initiatives, and cutting-edge tools—all within a collaborative, inclusive culture where your contributions are valued and recognized.

Compensation & Growth

Base Salary Range:

$144,000.00 - $216,000.00, offered in good faith and based on experience, location, and qualifications.

• Additional Rewards: Annual bonus opportunities and potential long-term incentives tied to both company and individual success.

Empowering Every Voice to Shape the Future:

Onto Innovation is committed to creating a workplace where every qualified candidate has an equal opportunity to succeed. We evaluate applicants based on skills, experience, and potential - without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, veteran status, or any other characteristic protected by law. We believe diversity of thought and background drives innovation and strengthens our team.

Important Note on Export Compliance

For certain positions requiring access to technical data, U.S. export licensing review may be necessary for applicants who are not U.S. Citizens, Permanent Residents, or other protected persons under 8 U.S.C. 1324b(a)(3).