Java Software Engineer: Scalability | NoSQL | Cloud (Oxford, UK)

Do you have a deep interest in web scalability, concurrency and software security? Are you an avid user of Open Source Software? Would you like to help us secure the software that runs the world?

We value creativity, intelligence, and a love of learning. We are interested in talking to people at any point in their career: from Interns to Seniors and above.

 Essential Requirements
  • Strong skills in Java (specifically in scalability and concurrency)
  • A rigorous foundation in computer science (such as a Computer Science degree, Masters or PhD)

 Desirable skills
  • Significant experience working on web-based systems that process large volumes of data in Java
  • No frameworks required: the role is in-depth, intricate, core Java work focused on concurrency and scalability
  • Experience with JavaScript (React) and/or TypeScript would be useful
  • Database and data processing experience (NoSQL, MySQL, Postgres)
  • Ideally some Cloud experience. We use GCP but the others are ok too!

As a Java Software Engineer you will be helping us build and scale LGTM — Semmle’s variant analysis platform that automatically checks your code for real CVEs and vulnerabilities. By combining deep semantic code search with data science insights, LGTM ranks the most relevant results to only show you the alerts that matter. LGTM offers insights from a large community of top security researchers including Microsoft, Google, and Uber to help developers ship secure code
You’ll be responsible for building out and scaling LGTM from handling hundreds of thousands of analyses to millions and giving the best possible performance to our customers’ engineers. You’ll have wide-ranging responsibility to take ideas from conception to deployment.

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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