Developer Platform Engineer

About the role

About Us Equals Money is a leading payments and financial operations platform helping businesses simplify, control, and optimise their money movement. With more than a million customers served over 18 years, our award-winning portfolio spans travel money, international transfers, card issuing, FX hedging, and expense management. In May 2025, Equals Money and Railsr came together to form a single, more powerful fintech. The merger unlocks a rare moment: we have the scale, regulatory foundation, and infrastructure of an established business, combined with the urgency, complexity, and ambition of a high-growth company rebuilding its operating model for the next decade. To deliver on this vision, we are transforming how our business works from the inside out. We are building integrated systems, automated workflows, and AI-enabled processes that will power faster onboarding, stronger compliance, better decision-making, and rapid international expansion. About the Role Equals Money is building the infrastructure that lets businesses move money with confidence. Our APIs are at the heart of that - and right now they're not as easy to integrate with as they should be. We're hiring a Developer Platform Engineer to own that. This is a hands-on, high-ownership role sitting at the intersection of engineering and external developer experience. You'll build and own the developer sandbox - a production-grade environment where external developers can integrate, test, and ship - and you'll shape everything around it: the APIs, the documentation, the tooling, and the feedback loop back into our engineering teams. This isn't a documentation role. We're looking for someone who writes production code, makes opinionated decisions about how our platform should work, and can represent Equals Money's APIs to the world. What You'll Own The Developer Sandbox (Primary Ownership) The sandbox is your core product. You're accountable for making it best-in-class - not just functional, but genuinely useful for developers building real integrations. That means: Designing and building a production-parity sandbox environment that external developers can rely on Owning the full lifecycle: architecture, deployment, reliability, and continuous improvement Making it the gold standard by which external developers judge Equals Money's platform Ensuring it surfaces realistic data, simulates edge cases, and removes friction from day one of integration Developer MCP Server Equals Money is investing in AI-native developer tooling. You'll own the externally facing MCP (Model Context Protocol) server - the interface that lets AI assistants and agentic tools integrate directly with our platform. That means: Owning the full lifecycle of the MCP server: design, implementation, deployment, and ongoing reliability Ensuring the server exposes well-structured, discoverable tools that make Equals Money's APIs accessible to AI agents and developer tooling Collaborating with internal engineering teams to surface new capabilities through the MCP interface as the platform evolves Monitoring adoption, gathering developer feedback, and iterating to improve the integration experience Keeping the server secure, versioned, and aligned with our API standards and FCA regulatory obligations API Quality and Developer Experience Auditing and improving our external APIs - naming, consistency, error handling, and documentation Building SDKs, code samples, and integration guides that developers actually want to use Writing technical content: quickstarts, tutorials, API reference, and how-to guides Instrumenting developer journeys to identify where integrations break down and fixing the root cause Developer Feedback Loop Being the voice of the external developer inside Equals Money's engineering teams Triaging integration pain points and driving improvements directly - not just creating tickets Collaborating with product and engineering to influence API design decisions before they ship Engaging with external developers to gather feedback and build trust in the platform What We're Looking For You'll thrive in this role if you Are an engineer first - you write production code and take ownership of what you ship Have built or integrated with REST APIs and understand what makes them a joy (or a nightmare) to work with Have strong opinions about developer experience and can back them up with working software Are comfortable working independently and driving outcomes without a detailed roadmap Enjoy being externally facing - writing for developers, gathering feedback, and improving things iteratively Can translate between technical complexity and clear, developer-friendly communication Technical background we're looking for Strong hands-on experience with backend development and API design (REST, webhooks, auth patterns) Experience building or owning developer-facing tooling: SDKs, sandbox environments, integration test suites Familiarity with MCP (Model Context Protocol) or AI agent i

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