Senior Fullstack Engineer - London

Capi is building the financial infrastructure for emerging markets trade. Our mission is to grow GDP in emerging markets by making the global financial system fairer and more accessible. We’re tackling global trade, making it easier for importers to pay their international suppliers. Our platform enables businesses to expand rapidly, create jobs, and be engines of prosperity for their countries. Our team is made up of approx 100 people across 10 countries; we are a group of highly ambitious, get-it-done people, who like to work hard on something that has a tangible impact in the world.

Role Overview

You’ll join a small, high-performing team of engineers and product leaders shaping how we scale our platform and our impact. From your first day, you will have the opportunity to work closely with the founding team based across London & Paris to shape the product vision and all parts of our technical architecture. As we scale our products and deepen our presence across emerging markets, this is a role that builds technology to solve customer problems. To do that, you must have empathy and curiosity to get to the root cause of the issue and the creativity to build a solution that balances impact, effort, and delight.

Key Responsibilities

• Delivery
  • Contribute to the product process from end-to-end, from ideation to building the UI, backend logic, deployment, feedback and measurement.
  • Communicate internally and externally about new features, be it collecting feedback pre-implementation or explaining them on launch.
  • Define and manage delivery milestones, ensuring alignment between engineering and product priorities.
• Technical
  • Build intuitive and performant web interfaces for business owners in Africa.
  • Implement IT security and data protection best practices in a regulated environment.
  • Proactively drive architectural decisions e.g., improving scalability, observability, and modularity of the codebase.
  • Champion code quality through robust testing, documentation, and reviews.
• Operational
  • Observe opportunities for improvements internally to help automate our non-tech processes and add to our tech best practices to improve our output and efficiency, including handling production incidents with confidence.
• Leadership
  • Mentor junior engineers and contribute to their professional growth through pairing, reviews, and feedback.
  • Represent engineering in cross-functional discussions (including Finance, Operations, Senior Leadership) to help translate business goals into technical plans.
  • Set and uphold team standards for communication, collaboration, and technical excellence.
• Culture
  • Communicate internally and externally about new features, be it collecting feedback pre-implementation or explaining them on launch.

Requirements

• Our tech stack: Typescript, React, NextJS, NodeJS, Express, PostgreSQL.
• A product mindset is core to how we build - everyone at Capi is encouraged to think about the customer, the business, and the long-term impact of what we ship.
• A strong understanding of web development, frontend and backend best practices, while mainly working with JavaScript technologies.
• Experience in a VC-backed or high-growth engineering team and building products used by customers.
• You are comfortable working in an early-stage startup environment with high pace, rapid growth, involvement in the entire product development process, and a high degree of ambiguity.
• Excellent written and verbal communication skills for expressing ideas, designs, and potential solutions with both technical and non-technical team members and customers.
• You care about our mission and solving the problems faced by African businesses.
• Based in London or Paris.

Bonus points if you:

• Speak and write in French & English.
• Experience in Fintech, payments, wallets or building ledgers.
• Expertise in security and data protection best practices needed in a FCA regulated business.

Some projects the team has been working on:

• Automated payouts and AI invoice approval.
• Onboarding + payment automation with Swift network and banking partners across the world.
• WhatsApp bot that creates quotes for customers based on their responses.
• Self-serve onboarding flow that collects company information and KYC documents from customers.
• Asynchronous workers that OCR invoices.
• Internal tooling to manage and process millions of dollars of transactions.

What to expect when interviewing with Capi?

Our interview process includes:

• Screen interview with our Tech Recruiter Gracie (30 mins) - Learn about the Capi story and mission. Whilst ensuring we are aligned as an exciting opportunity for what you're looking for.
• Technical challenge with one of our Principal Engineers (1 hr) - Demonstrate your abilities in a whiteboard-style interview with one of our senior team members. This interview is to assess your skills, interests, and potential to see the impact you could make.
• Deep dive (1 hr) - Meet the hiring manager and explore your relevant experience and our upcoming projects.
• Founder chat (30 mins) - Meet the founders to learn about Capi's growth plans, mission, and revenue targets. This is also your opportunity to ask any final questions to make sure our journey is right for you.
• References.
• Offer!

Additional Information

This is a full-time position with competitive salary, share options, and benefits. Ideal Start date: March 2026 (we are aware that a notice period may need to be fulfilled and can adjust accordingly).

Capi is an equal opportunity employer and welcomes candidates from diverse backgrounds. We’re all about building a diverse, inclusive team at Capi. If there’s anything you need to make the interview process easier—whether it’s accessibility support, a different format, or just a heads-up about what to expect—just let us know, we’re happy to help.

We've won some cool awards recently too! Check them out: Startups UK Top 100 (No. 24), Viva Technology Top 100, Welcome to the Jungle's Fintech's Finest Top 50.