Senior Full Stack Engineer (Javascript)

Capi is building the financial infrastructure for emerging markets trade. Backed by $18M+ from top-tier investors like Creandum, Y Combinator, General Catalyst, and angels from Revolut, Checkout, Stripe, and Remitly, we’re building the financial infrastructure that emerging markets deserve. 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 a highly-ambitious, get-it-done people, who like to work hard on something that has a tangible impact in the world. And we’re looking for more people to join our team! Take a look through Capi’s mission & values. 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 Leadership Excellence * Lead by technical example — your influence comes from the quality of your work, your judgment and your ability to bring others along with you, not from authority. * Own technical direction within your team and workstream, collaborating closely with principal engineers and the Head of Engineering to align with broader architectural strategy. * Mentor senior engineers through pairing, code reviews and design discussions — raising the technical floor of the people around you. * Champion engineering best practices across the team, introducing standards and patterns that improve consistency, reliability and developer experience. * Act as a subject matter expert in your core technical domain, and be the person others turn to when the problem is hard. Delivery Excellence * Lead the end-to-end delivery of complex, multi-stakeholder projects — from scoping and design through to deployment, feedback and iteration. * Translate ambiguous problem spaces into clear technical plans, breaking down large initiatives into well-defined milestones that the team can execute against. * Manage delivery dependencies across teams and communicate progress clearly to both technical and non-technical stakeholders. * Drive a culture of outcome-oriented delivery within your workstream — focused on impact shipped, not activity completed. * Proactively identify and remove blockers before they slow the team down. Operational Excellence * Take ownership of the reliability and observability of systems within your domain — ensuring they are monitored, well-understood and resilient to failure. * Handle production incidents with confidence, leading postmortems that result in genuine process improvements rather than just documentation. * Set the standard for what good operational practice looks like within your team — monitoring, alerting, runbooks and on-call hygiene. * Contribute to company-wide reliability initiatives led by principal engineers and the Head of Engineering. Technical Excellence * Make and defend strong architectural decisions within your workstream, balancing pragmatism with long-term technical health. * Write production-quality code consistently — this is a fully IC role and hands-on technical contribution is expected at all times. * Drive scalability, modularity and performance improvements in the areas of the codebase you own. * Champion code quality through rigorous testing, thoughtful documentation and constructive code reviews that develop the engineers around you. * Proactively identify technical debt and lead initiatives to address it before it compounds. 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: 1. 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 2. 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. We like to keep this as natural as possible, as if you were joining us tomorrow. This interview is to assess your skills, interests, and potential to see the impact you could make. While also ensuring Capi can support your growth 3. Deep dive (1 hr) - Meet the hiring manager and explore your relevant experience and our upcoming projects 4. 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. 5. References 6. Offer! ADDITIONAL INFORMATION This is a full-time position with a competitive salary, share options, and benefits. We would be looking to hire for this role by June 2026, but are happy to align with notice periods as required. Take a look at what it is like to work at Capi Money across all of our international offices. Capi is an equal opportunity employer and welcomes candidates from diverse backgrounds. We’re all about building a diverse, inclusive team at Capi. Whoever you are, we’d love to hear from you. 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

ABOUT US Humaans is building the next generation of infrastructure for the workplace; software designed for companies that are scaling fast, operating globally, and pushing into new boundaries. What started as a system of record has evolved into a broader platform for operating people globally. With Athena, our agentic AI layer, Humaans moves beyond data management into intelligent orchestration, connecting workflows across HR, IT, Finance, and Operations so organisations can act faster and with greater confidence, redefining how work gets done. We work with ambitious teams across Europe and the US, from AI-native companies like Lovable, Poolside, Fyxer AI, and Tandem Health, to established, high-growth organisations scaling internationally and through acquisition, including Quantexa, Sellpy, Manychat, Gigs, Croud, and Threecolts. These teams don’t buy software for features,they buy leverage. The ability to run faster, cleaner, and with more control as complexity compounds. To date, we’ve raised $20m in venture funding from some of the most respected founders, operators, and funds in technology: Lachy Groom (Physical Intelligence), Stewart Butterfield (Slack), Tobias Lütke (Shopify), Dylan Field (Figma), Jeff Weiner (LinkedIn), Claire Johnson (Stripe), Oliver Jay (OpenAI), Jay Simmons (Bond) as well as Y Combinator, Moonfire, Frontline Ventures, Pathlight Ventures, and Exor. If you have massive ambition and want to work on a hard problem, with a small team that moves fast, at a moment when the category is genuinely up for grabs - this is it. OUR TECH STACK Our tech stack today consists of TypeScript, JavaScript, React, Node, Postgres and Redis. We use GitHub for code and continuous integration to deploy to Kubernetes on Google Cloud Platform. We have a public REST API and our browser client uses a realtime WebSocket API. We obsess over details and quality of the user facing features and their implementation. Yet we move fast by creating focus and leveraging high quality foundations. YOUR DAY TO DAY * Help us shape the product from definition to release * Build end to end features, fix bugs, improve infra, support customers * Write backend TypeScript in Node, Postgres, Redis, Kubernetes * Write frontend TypeScript in React * Expand our 3rd party integration marketplace * Contribute to our technical architecture planning * Support sales and marketing teams SKILLS * Multiple years of industry experience in a full stack web app development role (ideally in SaaS) * Great knowledge of TypeScript and an appreciation for the language * Appreciation for design and digital product craftsmanship * Experience collaborating directly with product teams and designers, and a proven track record of delivering value to customers or users This is an in-person role. Our team comes together in the office Monday through Thursday, while most of the team collaborates in person on Mondays, Tuesdays, and Thursdays. PACKAGE & BENEFITS Early stage startups can be messy – we know that. We're putting effort in providing you with the best employee experience and a quality driven environment in exchange for trusting us. * Market-leading compensation that reflects your value * 25 days paid time off each year plus public holidays * Share Options with 5-year exercise window so you don’t feel pressure to exercise if you leave * Free Thursday lunches at HQ, quarterly team events, and company offsites. * Top tier private coverage for health, vision and dental care * A new MacBook and tools you need to do your best work * Enhanced parental leave with up to 16 weeks for primary and 4 weeks for secondary * Learning & development budget WHY JOIN HUMAANS TODAY? HR tech is having its AI moment and we’re positioned to own it. Humaans started as a next-gen HRIS taking on large incumbents in a massive market. We’ve since evolved into something even bigger: an AI platform that sits across workforce data and automates the operational layer of HR entirely; the natural progression of what we’ve been building toward. The product is highly differentiated. It’s built around a structured workforce data model that makes AI reliable in an HR context, something no one else has gotten right. Customers notice the difference immediately. We’re backed by Y Combinator, Lachy Groom, Moonfire, Frontline Ventures, and operators who’ve built some of the most consequential software companies of the last decade: the founders of Slack, Figma, and Shopify, and Asana’s former CRO and Head of OpenAI International. We’re a small team with an unapologetically high bar. It shows up in the product, in how we communicate, and in the standards we hold each other to. OUR COMMITMENT TO DIVERSITY At Humaans we’re looking for genuinely good people that are transparent and emphatic. We’re committed to providing equal opportunities, a diverse and inclusive work environment, and ensuring a fair interview process for everyone. You’re welcome to apply no matter your gender, ethnicity, sexual orientation, religion, civil or family status, age, disability, or race. PRIVACY NOTICE We care about your privacy. When you apply for a role at Humaans, we’ll collect and process your personal data as part of our recruitment process. This includes things like your CV, contact details, and any other information you choose to share. We may also contact you about future opportunities. You can ask us to delete your data at any time. For more details, see our Privacy Policy.