Senior Frontend Engineer (£70k-£150k + Equity) at Evervault Limited

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Job Title

Senior Frontend Engineer

Salary

£70k‑£150k + Equity

Company

Evervault Limited – VC‑backed fintech infrastructure for encryption and data security

Location

London, UK

Job Description

You will join the Cards team to build core payments infrastructure that tokenises and secures sensitive data at scale. As a Product Engineer, you will own the entire lifecycle of card security primitives, designing developer‑facing APIs and shipping full‑stack solutions that power transaction volume for industry leaders like Ramp and Rippling.

Why This Role Is Remarkable

  • Solve complex infrastructure challenges involving card network integrations, 3D Secure, and confidential computing at a high‑growth startup processing $5B+ annually.
  • Join an elite ~25‑person team backed by tier‑one investors including Sequoia Capital, Index Ventures, Kleiner Perkins, and Ribbit Capital.
  • Work in a developer‑first environment where you have a direct line to product direction and ship code that serves the internet's biggest merchants.

Responsibilities

  • Design and build robust, developer‑facing APIs and UI components for secure card data tokenisation and orchestration.
  • Work directly with customers to understand their payment stacks, debug complex integrations, and shape the product roadmap based on real‑world needs.
  • Own features end‑to‑end, moving across the stack from backend services in Rust to frontend SDKs and documentation in TypeScript.

Ideal Candidate

  • Significant experience shipping production‑grade products, with 3‑10+ years in software engineering and a strong foundation in CS, math, or physics.
  • Deeply product‑mindful with a relentless focus on developer experience and the ability to articulate technical decisions clearly to customers.
  • Strong technical taste and a desire to go deep into payments domain expertise, including card networks, encryption, and distributed infrastructure.

#J-18808-Ljbffr”, “datePosted”: “2026-04-20”, “hiringOrganization”: { “@type”: “Organization”, “name”: “Jack and Jill AI”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__408838824__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=33” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }
Company: Jack and Jill AI
Apply for the Senior Frontend Engineer (£70k-£150k + Equity) at Evervault Limited
Location: London
Job Description:

Job Title

Senior Frontend Engineer

Salary

£70k‑£150k + Equity

Company

Evervault Limited – VC‑backed fintech infrastructure for encryption and data security

Location

London, UK

Job Description

You will join the Cards team to build core payments infrastructure that tokenises and secures sensitive data at scale. As a Product Engineer, you will own the entire lifecycle of card security primitives, designing developer‑facing APIs and shipping full‑stack solutions that power transaction volume for industry leaders like Ramp and Rippling.

Why This Role Is Remarkable

  • Solve complex infrastructure challenges involving card network integrations, 3D Secure, and confidential computing at a high‑growth startup processing $5B+ annually.
  • Join an elite ~25‑person team backed by tier‑one investors including Sequoia Capital, Index Ventures, Kleiner Perkins, and Ribbit Capital.
  • Work in a developer‑first environment where you have a direct line to product direction and ship code that serves the internet’s biggest merchants.

Responsibilities

  • Design and build robust, developer‑facing APIs and UI components for secure card data tokenisation and orchestration.
  • Work directly with customers to understand their payment stacks, debug complex integrations, and shape the product roadmap based on real‑world needs.
  • Own features end‑to‑end, moving across the stack from backend services in Rust to frontend SDKs and documentation in TypeScript.

Ideal Candidate

  • Significant experience shipping production‑grade products, with 3‑10+ years in software engineering and a strong foundation in CS, math, or physics.
  • Deeply product‑mindful with a relentless focus on developer experience and the ability to articulate technical decisions clearly to customers.
  • Strong technical taste and a desire to go deep into payments domain expertise, including card networks, encryption, and distributed infrastructure.

#J-18808-Ljbffr…

Posted: April 20th, 2026