Vulnerability Researcher (f/m/d)
SonarSource
bochum, germany
Posted on Jan 23, 2026
Who is Sonar?
Sonar helps prevent code quality and code security issues from reaching production, amplifies developers' productivity in concert with AI assistants, and improves the developer experience with streamlined workflows. Sonar analyzes all code, regardless of who writes it — your internal team, genAI, or third parties — resulting in more secure, reliable, and maintainable applications. Rooted in the open source community, Sonar’s solutions support over 30 programming languages, frameworks, and infrastructure technologies. Today, Sonar is trusted by +7M developers worldwide, including teams at the DoD, Microsoft, NASA, MasterCard, Siemens, and T-Mobile.
We believe in developing great products that are supported by great internal teams and a strong culture. We are highly committed to and obsessed with the company, users, each other, and our open source community. We have high standards and hold each other accountable for acting with positivity, dedication, thoughtfulness, empathy, and passion daily.
We are deliberate with our decisions with high clarity of intention. At the same time, we feel extreme urgency and move forward quickly.
And lastly, we are highly effective and operationally efficient. We operate collectively as One Team to accomplish our goals.
At Sonar, CODE is more than just an acronym – it's a mindset that defines daily operations.
Why You Should Apply:
At Sonar, we’re a group of brilliant, motivated, and driven professionals working hard to help supercharge developers to build better, faster. Sonar helps to continuously improve code quality and code security while reducing developer toil. This means that developers can focus on doing more of what they love and less of what they don’t. Our solutions don’t just solve symptoms of problems – we help fix issues at the source – for all code, whether it's developer-written, AI-generated, or from third parties.
We have a dynamic culture with employees worldwide and hub offices in the USA, Switzerland, the UK, Singapore, and Germany. Team members should be able to come to work every day, work on a product they are proud of, love what they do, and feel energized by their peers. With our roots deep in the open source community, we’re all about the mission: supercharge developers to build better, faster.
The Impact You Will Have:
SonarSource is looking for a passionate Vulnerability Researcher who loves discovering 0-day vulnerabilities in open-source code and helping to push our code analysis technology to the next level. You will be part of the Code Security Department and play a central role in realizing our ambition to provide the best code analysis solution on the market. By sharing your security research and findings with a world-wide community, you establish a reference of trust for code security and help developers to write secure code.
What You Will Do Daily:
- Have fun and learn with world-class security enthusiasts that share your passion and interest for web security
- Uncover, discuss, exploit and report critical and complex vulnerabilities in popular open source web applications (see https://www.sonarsource.com/blog/)
- Research new and existing vulnerability types as well as exploitation techniques
- Automate the detection of vulnerabilities in well-known applications by using our best-in-class code analysis technology
- Share your research and findings with the world-wide community by writing blog posts or presenting at international conferences
The Experience You Will Need:
- You have 3+ years of experience in reviewing source code for critical security vulnerabilities (CTFs do count ;)
- You have a deep understanding of major security vulnerability types, how to spot these in source code, and how to exploit them with different techniques
- You have solid programming skills in at least one of the following languages: Java, C#, Python or JavaScript
- You are passionate, creative and persistent when auditing new source code and you can think outside the box
- You care about professional and responsible disclosure of security vulnerabilities to the affected vendor
- You are fluent in English, both written and spoken, and are able to explain complex security concepts in a structured and understandable way
Why You Will Love It Here:
- Our culture and mission set us apart. We have a dynamic work culture that values respect and kindness and embraces the right to fail (and get right back up again!).
- Great people make a great company. We value people skills as much as technical skills and strive to keep things friendly while still being passionate leaders in our domains.
- We have a flexible work policy that includes 3 days in-office and 2 days work-from-home each week for those located near our office locations; some locations such as Dubai, India, Japan and Australia operate fully remotely.
- We have a growth mindset. We love learning and believe continuous education is critical to our success. In an ever-changing industry, new skills are necessary, and we're happy to help our team acquire them.
- As the leader in our field, our products and services are as strong as our internal team members.
- We embrace transparency with regular meetings, cascading messages and updates on the growth and success of our organization.
Benefits of Working with Sonar:
- Pension Scheme: 1st Pillar (Unterstützungskasse): Automatic, financed by Sonar, 3% of gross salary, an additional benefit in addition to your salary.
- Pension Scheme:2nd Pillar (bAV): Voluntary, 15% contribution by Sonar from social security savings.
- We encourage usage of our robust time-off allocations with 28 PTO days for our employees based out of the Geneva region, plus additional days based on seniority and circumstances.
- Sonar recognizes holidays on working calendar days. If the holiday date occurs on a Saturday, we will recognize the day on the preceding Friday. If the holiday date occurs on a Sunday, we will recognize the day on the following Monday.
- Public transport reimbursement of 60% for annual subscription.
- Global workforce with employees in 20+ countries representing 35+ unique nationalities.
- We have an annual kick-off somewhere in the world where we meet to build relationships and goals for the company.
We Value Diversity, Equity, and Inclusion:
At Sonar, we believe that our diversity is our strength. We are a global company that values and respects different backgrounds, perspectives, and cultures.
We are committed to fostering a diverse and inclusive work environment where everyone feels valued and empowered to contribute their best. We are proud to be an equal opportunity employer and welcome all qualified applicants, regardless of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.
All offers of employment at Sonar are contingent upon the precise results of a comprehensive background check and reference verification conducted before the start date.
We do not currently support visa candidates in the US.
Applications that are submitted through agencies or third party recruiters will not be considered.