Senior Back End Developer

Elockers runs the smart-locker platform that festivals, venues, and events across six countries rely on for real-time payments and marketplace-style payouts, including on-sale moments where a large share of a site's lockers can sell out within a minute. We're live in eleven countries, with further international expansion underway. Our platform is genuinely strong: microservices architecture (~30 services), event-driven data flow, and a payments stack built for a real marketplace. This isn't a role about fixing something broken. It's about strengthening a platform that already works well, hands-on. The Role We're looking for an exceptionally strong, hands-on Senior Back-end Developer to work deep in our microservices platform, where software, payments, and physical hardware come together. You'll match our current technical level and raise it through your own hands-on work. This is a pure individual-contributor role: you'll design, build, and debug complex systems yourself, with real technical depth, not people management. What you'll work on • Our microservices platform, with Node.js and modern architecture patterns at the core • Cloud-native engineering on DigitalOcean App Platform: deployment, scaling, monitoring, and production reliability • Reliability at peak: real-time payments and traffic spikes during live events, with zero tolerance for downtime • Our Adyen-based payments and marketplace systems, and how our software connects to physical locks and hardware • Engineering discipline: CI/CD, documentation, and AI-assisted development, as we raise an already-strong platform further What you'll bring • Deep, hands-on technical seniority. You independently design, build, and debug complex distributed systems • Strong, current Node.js and microservices expertise, a core requirement • Real soft skills and team fit. A clear communicator who works well in a small, fast-moving team • Genuine ownership mentality. You step up when something business-critical is on the line • Cloud/platform engineering experience, ideally DigitalOcean App Platform • Payments or marketplace experience (Adyen, PSPs, split payments, KYC) and comfort with high-peak, mission-critical systems • IoT/hardware integration experience is a genuine plus, our software talks to physical lockers • Nice to have: React Native/Expo experience, multi-country scaling with GDPR awareness, background in events or ticketing Our stack today Microservices (~30 services), moving toward Node.js at the core. Adyen for payments. Kafka, ClickHouse, Metabase for data. React Native/Expo for mobile. DigitalOcean, Sentry, New Relic, Jira for infra and tooling. What we offer • A gross annual salary of €60,000-€90,000, depending on experience • Real technical depth, working on a platform where software, payments, and hardware genuinely come together Sound like you? The most efficient way to apply is to apply here or on our website. For questions feel free to contact Brendan @ 0615348554 or brendan@elockers.com