Product Engineer

About Evervault Evervault offers modular payments infrastructure for companies building their own payments stack. We keep raw card data off your systems, cut PCI compliance work, improve acceptance, mitigate fraud and chargebacks and decrease your cost of payments, so you keep full control. Trusted by Ramp, Rippling, Modern Treasury and Overwolf; Series B, led by Ribbit Capital. Role Overview We’re hiring a Senior/Staff Product Engineer for our Cards team in London. You’ll own problems end-to-end across our payments infrastructure: tokenisation, card network integrations, 3DS and dispute management. That runs from customer conversations, through API design, to production code and measuring whether it worked. You’ll lead by example: mentoring, raising the bar and owning technical direction, staying hands-on the whole time. What You’ll Be Doing - Building core payments infrastructure, including tokenisation, network integrations, 3DS and dispute management - Designing developer-facing APIs, SDKs and primitives that developers enjoy using - Building high-throughput, distributed systems that handle millions of card transactions - Working directly with customers to understand their payment stacks, debug integrations and shape the roadmap - Shipping across the stack: backend services, APIs, UI components and documentation - Setting technical direction and mentoring engineers on the team Requirements - 6+ years of engineering experience, including 2–4+ recent years in at least one of: payments infrastructure or fintech, developer tooling, or design-first products - Strong fundamentals in distributed systems, networking and infrastructure, beyond just frameworks - Product-minded: you think about the developer experience of every API you design and judge your work by its impact on users - Comfortable explaining complex technical decisions to non-technical people and working in front of customers - Founder-like ownership: you take problems to completion without waiting to be told what to do Nice to Have - Rust and TypeScript experience (we care more about engineering ability than our exact stack) - Knowledge of card payments: networks, tokenisation, 3DS or PCI DSS This Might Not Be for You If… - You want to build from a spec: you’ll be expected to find and define the problem yourself - You want to manage people soon: this is primarily a Senior IC role with technical leadership rather than people leadership - You prefer to stay in one layer of the stack: you’ll move between backend, APIs, UI and docs - You’d rather avoid customers: you’ll be on calls and debugging integrations with them - You want to work fully remotely: we’re in our Shoreditch office Tuesday to Thursday Compensation, Benefits & Why Join - Competitive, London weighted salary - Stock options with an extended exercise window - Private health insurance - Unlimited PTO and flexible working hours - Daily lunch budget - Senior technical influence on a small, fast-growing team building infrastructure that processes millions of card transactions Interview Process 1. Recruiter screen 2. Hiring manager screen 3. Technical interview 4. Pair programming 5. Systems design (for Staff-level candidates) 6. Final round with our founder 7. References and offer Location This role is based in London, in our Shoreditch office Tuesday to Thursday. We do not currently sponsor UK work visas. Candidates must be based in the location specified. Any applications from candidates not in the required location may not receive a response.