Software Tools Engineers / Programming Language Tooling (Valencia, Spain)

Do you love creating tools that help users be productive? Are you a proponent of Open Source Software and its importance? Do you want to show the world how developer tooling is really meant to be done? Would you like to help us secure the code that runs the world?

The main thing we look for in candidates is intelligence and the ability to learn. We are interested in talking to people at any point in their career: from Interns to Seniors and above. 
For this role, you should be able to demonstrate good design judgement and an interest in developer productivity:

  • Essential Requirements
  • Experience of one or more of the following programming languages: C / C++, C#, Java, JavaScript, Python, Go
  • Experience of building software tools or programming language tooling (compilers, IDEs, editors, doc generators, indexers, formatters, extractors, refactoring tools etc.)

  • Desirable skills
  • Editor tooling and code navigation/exploration
  • Editor/IDE plugins (Eclipse, Visual Studio, IntelliJ, VS Code, Emacs etc.)
  • Programming language usability
  • UI design (graphical or command-line)
  • Documentation and accessibility

You will be responsible for creating world leading software tooling for our QL programming language. QL is a variant analysis engine that allows product security teams to quickly explore code to find zero-days and all variants of vulnerabilities. You will help our program analysis experts, security researchers (both at Semmle and elsewhere) and the open-source community at large get the most out of QL. You will help us grow the QL community from a small group of enthusiastic power users to everybody who cares about program analysis and code health.

About Semmle
Semmle believes security is a shared responsibility. Our mission is to secure the code that runs the world by bringing the security and development communities together. Google, Microsoft, NASA, Uber, Palantir and many others rely on Semmle’s products to scale their security expertise and quickly explore any codebase to discover zero-days and all variants of vulnerabilities. We empower product security teams to deliver variant analysis results to development teams using LGTM to ship safe code and protect their customers. Semmle's platform enables the security community to collaborate and share their expertise in the field of variant code analysis and security research.

We offer intellectually stimulating work, competitive salaries, and a relaxed work environment in Oxford, Valencia, Copenhagen, New York, San Francisco or Seattle.

How do you apply?
Semmle aims to hire outstanding people who have a diversity of perspectives, ideas and cultures. We actively support diversity and inclusion in the workplace and are committed to equal employment opportunity regardless of race, colour, ancestry, religion, sex, national origin, sexual orientation, gender identity, age, citizenship, marital status or disability status.

Please complete the following form to apply or feel free to get in touch with Zac Wallis at for more information. 

We encourage applicants to let us know of any accessibility requirements, so that we may provide the best possible support during the application process and your time at Semmle.

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