Company: Jack & Jill
Location: London
Job Description:
Company Description
VC-backed fintech infrastructure startup
Location
London, UK
Job Description
You will join a high-performance team building core payments infrastructure and data security primitives. This role involves owning the entire product lifecycle from customer discovery to shipping production-grade APIs. You will work across the stack to develop solutions for tokenization, network integrations, and 3D Secure for major global merchants.
Why this role is remarkable
- Work on mission‑critical infrastructure where security and precision are paramount for global transaction volume.
- Backed by top‑tier VCs with a lean team of approximately 25 people, ensuring high impact and ownership.
- Opportunity to shape the product roadmap and technical culture of a rapidly scaling developer‑first company.
What you will do
- Design and build developer‑facing APIs and full‑stack primitives for card data security and payments.
- Collaborate directly with customers to understand their payment stacks and debug complex technical integrations.
- Own features end‑to‑end, contributing to everything from backend services and SDKs to technical documentation.
The ideal candidate
- Deeply technical with strong fundamentals in systems, networks, and distributed infrastructure beyond just frameworks.
- Product‑minded engineer with “founder energy” who prioritizes developer experience and impact over simple output.
- Excellent communicator with a high bar for quality in code, API design, and visual documentation.
Required Skills
- Full Stack Development
- Networking
- Distributed Systems
- Data Security
Languages
- English
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Posted: May 26th, 2026