Company: Jack & Jill
Location: London
Job Description:
Job Title
Senior / Staff Product Engineer
Salary
£70k-£150k + Equity
Company Description
Sequoia & Index-backed payments infrastructure startup with $46M raised
Job Description
Join a high-caliber team of 25 building the encryption layer for global commerce. You will own the card data lifecycle end-to-end, designing APIs that power payments for giants like Ramp and Rippling. This is a rare chance to ship mission-critical infrastructure where security, scale, and developer experience are the primary products.
Location
London, UK
Why this role is remarkable
- Work at the heart of the payments stack, processing $5B+ in annual volume for the internet’s fastest-growing fintechs and marketplaces.
- Exceptional pedigree with backing from Sequoia, Kleiner Perkins, and Index Ventures, having recently closed a $25M Series B to scale operations 4x.
- True ownership culture where every engineer influences product direction, working with a sophisticated tech stack including Rust and TypeScript in a high-trust environment.
What You Will Do
- Design and implement developer-facing APIs and primitives for card tokenization, 3D Secure, and multi-PSP orchestration.
- Collaborate directly with customers to understand complex payment stacks and shape the product roadmap based on real-world friction.
- Own features from problem definition through to production, ensuring sub-millisecond encryption and high-availability across distributed systems.
The ideal candidate
- 3-10+ years of experience shipping high-quality software, with Senior/Staff candidates showing deep domain expertise in card networks or tokenization.
- Strong fundamentals in systems, networks, and distributed infrastructure with a relentless focus on developer experience and API design.
- A “founder energy” mindset with a bias for action and the ability to operate across the full stack—from backend services to documentation.
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Posted: May 31st, 2026