Developer Platform Engineer Full Time

About UsEquals 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 RoleEquals 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 APIsto the world.What You’ll OwnThe 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 onOwning the full lifecycle: architecture, deployment, reliability, and continuous improvementMaking it the gold standard by which external developers judge Equals Money’s platformEnsuring it surfaces realistic data, simulates edge cases, and removes friction from day one of integrationDeveloper MCP ServerEquals 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 reliabilityEnsuring the server exposes well-structured, discoverable tools that make Equals Money’s APIs accessible to AI agents and developer toolingCollaborating with internal engineering teams to surface new capabilities through the MCP interface as the platform evolvesMonitoring adoption, gathering developer feedback, and iterating to improve the integration experienceKeeping the server secure, versioned, and aligned with our API standards and FCA regulatory obligationsAPI Quality And Developer ExperienceAuditing and improving our external APIs – naming, consistency, error handling, and documentationBuilding SDKs, code samples, and integration guides that developers actually want to useWriting technical content: quickstarts, tutorials, API reference, and how-to guidesInstrumenting developer journeys to identify where integrations break down and fixing the root causeDeveloper Feedback LoopBeing the voice of the external developer inside Equals Money’s engineering teamsTriaging integration pain points and driving improvements directly – not just creating ticketsCollaborating with product and engineering to influence API design decisions before they shipEngaging with external developers to gather feedback and build trust in the platformWhat We’re Looking ForYou’ll thrive in this role if youAre an engineer first – you write production code and take ownership of what you shipHave built or integrated with REST APIs and understand what makes them a joy (or a nightmare) to work withHave strong opinions about developer experience and can back them up with working softwareAre comfortable working independently and driving outcomes without a detailed roadmapEnjoy being externally facing – writing for developers, gathering feedback, and improving things iterativelyCan translate between technical complexity and clear, developer-friendly communicationTechnical background we’re looking forStrong 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 suitesFamiliarity with MCP (Model Context Protocol) or AI agent integration patterns is a strong plusFamiliarity with fintech or payments infrastructure is a plus, not a prerequisiteComfortable working across the stack where needed – this role touches infrastructure, backend, and docsWhy Equals MoneyWe’re a profitable, growing fintech building payments infrastructure for businesses. This role is genuinely greenfield – you’ll have real influence over how external developers experience our platform for years to come.High ownership from day oneDirect access to engineering leadership and product decisionsCompetitive salary, hybrid working, and a team that values outcomes over processThe chance to build something that meaningfully improves how developers workOur investment in you: We welcome people into the Equals group and desire to grow and develop our talented teams. We believe in teamwork and celebrating our successes. We strive to embrace our values. We want to put you in the driving seat of your career and achieve your full potential through growth opportunities and developmental support.When you join the Equals Group, we aim to help you to get more out of your career. We will also offer you the following benefits;BenefitsA competitive salary benchmarked against a peer group.25 days holiday per year + your birthday offOpportunities for progression, development and learning new skills – £250 towards the cost of learning & development.Free onsite Nuffield Health gym & pool (London) and discounted gym membership elsewhereGetActive with Aviva – Health and Wellbeing discounts on services and productsInterbank currency rates on travel money and international transfers.AXA Private HealthcareFree Eye Test and £50 up to the cost of glassesEAP Service – Mental Health ServicesLife Assurance Policy – x3 annual salaryContributory pension schemeCycle to Work SchemeSeason Ticket LoansEnhanced Parental PoliciesComplimentary tea, coffee, soft drinks and fruitWe operate a hybrid working arrangement where possibleWorking ArrangementsWhere possible, we offer the opportunity to work flexibly and the opportunity to balance some remote working with time in the office collaborating, taking part in events and developing the social connections that make working with us rewarding.Equals Group strives to create a workplace where we can all be ourselves. We believe in inclusion, equality and the power of diversity, so you’ll be encouraged to bring your unique perspectives and experiences, and help us understand what you need to do your best work.