Senior Software Engineer – Scalable Behavioral Simulations

Company: Jack & Jill
Apply for the Senior Software Engineer – Scalable Behavioral Simulations
Location: London
Job Description:

Jack & Jill is seeking a Software Engineer to build systems that enable organizations to test major decisions against synthetic populations. This role offers the chance to bridge AI research and product engineering in a fast-paced startup in Soho, London.

The ideal candidate will have a proven track record in startups, proficient in Python and FastAPI, and a passion for delivering high-impact software. You’ll work closely with data scientists and designers, owning the development lifecycle in an empowering culture.

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Posted: June 11th, 2026