INTERNSHIP DETAILS

Formal Methods Research and Development

CompanyJane Street
LocationLondon
Work ModeOn Site
PostedNovember 9, 2026
Internship Information
Core Responsibilities
Collaborate with mentors on real-world projects involving formal methods and language tooling for OCaml. Evaluate developed tools on large-scale production codebases to improve proof-driven software development.
Internship Type
full time
Company Size
3880
Visa Sponsorship
No
Language
English
Working Hours
40 hours
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About The Company
Jane Street is a quantitative trading firm with offices in New York, London, Hong Kong, Singapore, and Amsterdam. We are always recruiting top candidates and we invest heavily in teaching and training. The environment at Jane Street is open, informal, intellectual, and fun. People grow into long careers here because there are always new and interesting problems to solve, systems to build, and theories to test. More than twenty years after our founding, it still feels like we’re just getting started. Jane Street does not offer any services to individual investors: https://www.janestreet.com/fraud-and-impersonation-warnings/
About the Role

About the position

We're opening our first internships in the Formal Methods group of our OCaml Language team, which develops language features and tooling for correctness reasoning and bug finding in OCaml programs. With the emergence of agentic programming, we think formal methods will play a major role in helping validate agent-generated code and providing feedback for agents. Our vision is to make formal methods as useful a tool for building software as type systems are for us today, both by leveraging existing tools and technology, and pursuing novel approaches. 

During the internship, we want to give you a real sense of what it's like to work at Jane Street full time while also providing a truly unparalleled educational experience. You'll be paired with full-time employees who act as mentors, collaborating with you on a real-world project that combines your research background with one of our active projects, such as adding support for property-based testing of formal specifications or developing a refinement type system for functional correctness verification. You’ll have the opportunity to evaluate the tools you develop on a large, actively developed production codebase. You'll also be able to attend guest speakers and social events, and hopefully get a real sense of what it would be like to work here full-time.

There is plenty of work on combining agents and formal methods. What’s different at Jane Street is that we aren't stuck designing verification tools for legacy languages: we can modify and improve OxCaml, our branch of OCaml, and its development environment to make them well-suited for proof-driven software development. Moreover, we have a community of excellent programmers who are eager to adopt these tools and apply them to real software.

Learn more about Jane Street's internship program here.

About you

We're looking for PhD students, postdocs, and masters students with outstanding research experience in program verification, programming language semantics, property-based testing, static analysis, model checking, and related areas. You should be

  • A strong programmer who enjoys collaborating in small teams
  • Excited to turn research ideas into practical tools
  • Intellectually curious, humble and unafraid to ask questions 
  • Fluent in English

We don't expect you to have a background in finance, OCaml, or functional programming.

Key Skills
Formal methodsProgram verificationProgramming language semanticsProperty-based testingStatic analysisModel checkingOCamlFunctional programmingSoftware developmentRefinement type systemsAgentic programming
Categories
TechnologyScience & ResearchSoftware
Benefits
MentorshipEducational experienceGuest speakersSocial events