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Staff Software Engineer (C#)

SonarBochum, GermanyOnsite
Sonar solves the trillion-dollar challenge of bad code. Sonar equips organizations to achieve and sustain a Clean Code state by empowering developers to write consistent, intentional, adaptable, and responsible code. Clean Code produces software that is maintainable, reliable, and secure, allowing development teams to spend less time fixing issues and more time innovating. With Sonar, and by employing the company’s Clean as You Code methodology, organizations minimize risk, reduce technical debt, increase productivity, and derive more value from their software in a predictable and sustainable way.
Sonar’s open-source and commercial products – SonarLint, SonarCloud, and SonarQube – support over 30 programming languages, frameworks, and infrastructure technologies. Trusted by more than 500,000 organizations and used by more than 7 million developers globally to clean more than half a trillion lines of code, Sonar is integral to delivering better software.The impact you can haveSonarLint is a plugin for popular IDEs, with the aim to help developers fix code quality and security issues before they exist by analyzing and highlighting issues on the fly as you code.

In addition, SonarLint integrates with our server products SonarQube and SonarCloud to further enhance the development experience.Our team is looking for a talented C# developer passionate about creating great products to join our IDE squad and focus primarily on the SonarLint extension for Visual Studio. Your mission is to help the team make SonarLint a tool all developers love to use in their IDE.

On a daily basis, you will


  • Lead the execution of sprints within the squad developing SonarLint for Visual Studio (do specification, write code and tests, review code from peers, validate features, release).
  • Be a key contributor to an Open-Source tool that .NET developers know, use and love.
  • Overcome performance challenges in a complex, thread-heavy runtime environment.
  • Push the limits of what can be done with the APIs of the Visual Studio extensibility SDK.
  • Leverage the power of SonarCloud and SonarQube in the IDE, while ensuring a great developer experience in the IDE.
  • Continuously improve the CI pipeline supporting the development and release processes of our squad, dogfooding the Sonar products.
  • Collaborate with Product Managers and peers to define new features and set priorities, ensuring that the solutions fit into the Sonar ecosystem.
  • Contribute to the definition of the team’s short and long-term goals.
  • Engage with the Open-Source community, other SonarSourcers, and the Support team and integrate their feedback.
  • Actively contribute to the overall SonarLint team improvement by performing design and code reviews, challenging the status quo, improving processes, and sharing technical knowledge.
  • Bring your very own touch to the Sonar culture by participating in circles, initiatives and any of the various expressions of our collectively intelligent approach to work.

The skills you will demonstrate


  • Proven track record in software development with a strong focus on C# and the .NET ecosystem.
  • Ability to develop with clean code principles and practices.
  • Excellent engineering skills and a good understanding of Computer Science fundamentals.
  • Fluency in source code quality: tests (unit and functional), CI/CD, and code reviews.
  • Leadership: you take initiative and can bring a subject to completion with little to no supervision. You help others improve by supporting and mentoring them.
  • Experience with agile practices and principles.
  • Comfortable in dealing with change and ambiguity.
  • Self-confidence to challenge the status quo as well as to be challenged.
  • Fluent in English, both written and spoken.

Nice to have


  • Experience with developing Visual Studio extensions.
  • Experience with WPF.
  • Experience using and configuring static analyzers as part of the development process.
  • Experience in Java.

Why you will love it here


• We value a safe work culture - founded in respect, kindness, and the right to fail.• We hire great people - we value communication skills as much as technical prowess and we strive to create a work environment that allows for everyone to succeed and feel empowered to do their best work. Our 500+ SonarSourcers from 35 different nationalities can relate!• Work-life balance - a healthy work-life balance is very important at Sonar. • Flexible hours - we schedule our days in order to be effective at work, while also being able to enjoy life’s important moments.• We promote continuous learning - in an ever-changing industry, learning new skills is the key to growth and success! We're happy to support all employees in this journey if desired. 

What we do


As Home of Clean Code, Sonar is the ultimate solution to achieving Clean Code for developers and organizations alike. The company was formed to develop the open-source tool SonarQube, which has since become the go-to standard in code quality management. We strive every day to pave the way for developers, tackling the toughest issues head-on and pushing the limits of what’s possible. 

Who we are


At Sonar we believe in people, dedication, and innovation. We’re a team of problem solvers who are passionate and relentless in their respective missions. We want to work with people who are ready and willing to fasten their seat belts and be part of an incredible ride! Our Core Values are: Smarter Together, Excellence, Innovation, and Delivery. They reflect our unique culture and we expect them to help shape and positively strengthen our organization. If you want to learn more about our culture, check out our blog post.Join us; we’ll be smarter and stronger together!Sonar is an equal-opportunity employer and is committed to treating every employee with equal respect and fairness.

We maintain a zero-tolerance policy toward any form of discrimination. All candidates will receive equal consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, citizenship, age, veteran status, disability, or any other legally protected status.Apply for this job

Life at Sonar

Thrive Here & What We Value- Safe Work Culture: Respectful, kind, and supportive environment; encourages calculated risk-taking without fear of unjust consequences.- Hiring Great People: Emphasizes strong communication skills alongside technical expertise; fosters open dialogue and innovation.- Promoting Continuous Learning: Encourages lifelong learning through training programs, workshops, and resources for skill development.- Work-Life Balance: Offers flexible working hours to prioritize personal lives while maintaining productivity at work.- Core Values: Smarter Together, Excellence, Innovation, Delivery; guides actions towards collaboration, creativity, and exceptional results.- Zero-Tolerance Policy: Fosters an inclusive environment free from discrimination based on race, gender, age, religion, disability, sexual orientation, or other protected characteristics.- Teamwork: Leverages individual strengths through collaboration to achieve company goals and build strong relationships with partners, customers, and stakeholders.- Client-Centric Approach: Prioritizes client needs by delivering high-quality services that meet or exceed expectations while upholding ethical business practices.- Leadership Development: Investment in employee growth through leadership development opportunities to nurture future industry leaders.- Continuous Improvement: Committed to evaluating and adapting processes, products, and services for innovation and staying ahead of industry trends while encouraging personal growth.
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